Package 'pathlinkR' reference manual

Title:	Analyze and interpret RNA-Seq results
Description:	pathlinkR is an R package designed to facilitate analysis of RNA-Seq results. Specifically, our aim with pathlinkR was to provide a number of tools which take a list of DE genes and perform different analyses on them, aiding with the interpretation of results. Functions are included to perform pathway enrichment, with muliplte databases supported, and tools for visualizing these results. Genes can also be used to create and plot protein-protein interaction networks, all from inside of R.
Authors:	Travis Blimkie [cre] , Andy An [aut]
Maintainer:	Travis Blimkie <[email protected]>
License:	GPL-3 + file LICENSE
Version:	1.1.17
Built:	2024-09-24 19:56:03 UTC
Source:	https://github.com/bioc/pathlinkR

INTERNAL Create manual breaks/labels for volcano plots

Description

Internal function which is used to create even breaks for volcano plots produced by eruption.

Usage

.eruptionBreaks(x)
.eruptionBreaks(x)

Arguments

`x`	Length-two numeric vector to manually specify limits of the x-axis in log2 fold change; defaults to NA which lets ggplot2 determine the best values.

Value

ggplot scale object

INTERNAL Construct heatmap legend

Description

Helper function to handle heatmap legends without clutteing up the main function.

Usage

.plotFoldChangeLegend(.matFC, .log2FoldChange, .cellColours)
.plotFoldChangeLegend(.matFC, .log2FoldChange, .cellColours)

Arguments

`.matFC`	Matrix of fold change values
`.log2FoldChange`	Boolean denoting if values will be in log2
`.cellColours`	Colours for fold change values

Value

A list containing heatmap legend parameters and colour function

INTERNAL Wrapper around Sigora's enrichment function

Description

Internal wrapper function to run Sigora and return the results with desired columns

Usage

.runSigora(enrichGenes, gpsRepo, gpsLevel, pValFilter = NA)
.runSigora(enrichGenes, gpsRepo, gpsLevel, pValFilter = NA)

Arguments

`enrichGenes`	Vector of genes to enrich
`gpsRepo`	GPS object to use for testing pathways
`gpsLevel`	Level to use for enrichment testing
`pValFilter`	Desired threshold for filtering results

Value

A "data.frame" (tibble) of results from Sigora

References

https://cran.r-project.org/package=sigora

INTERNAL Break long strings at spaces

Description

Trims a character string to the desired length, without breaking in the middle of a word (i.e. chops at the nearest space). Appends an ellipsis at the end to indicate some text has been removed.

Usage

.truncNeatly(x, l = 60)
.truncNeatly(x, l = 60)

Arguments

`x`	Character to be truncated
`l`	Desired maximum length for the output character

Value

Character vector

Create a volcano plot of RNA-Seq results

Description

Creates a volcano plot of genes from RNA-Seq results, with various options for tweaking the appearance. Ensembl gene IDs should be the rownames of the input object.

Usage

eruption(
  rnaseqResult,
  columnFC = NA,
  columnP = NA,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  labelCutoffs = FALSE,
  baseColour = "steelblue4",
  nonsigColour = "lightgrey",
  alpha = 0.5,
  pointSize = 1,
  title = NA,
  nonlog2 = FALSE,
  xaxis = NA,
  yaxis = NA,
  highlightGenes = c(),
  highlightColour = "red",
  highlightName = "Selected",
  label = "auto",
  n = 10,
  manualGenes = c(),
  removeUnannotated = TRUE,
  labelSize = 3.5,
  pad = 1.4
)
eruption(
  rnaseqResult,
  columnFC = NA,
  columnP = NA,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  labelCutoffs = FALSE,
  baseColour = "steelblue4",
  nonsigColour = "lightgrey",
  alpha = 0.5,
  pointSize = 1,
  title = NA,
  nonlog2 = FALSE,
  xaxis = NA,
  yaxis = NA,
  highlightGenes = c(),
  highlightColour = "red",
  highlightName = "Selected",
  label = "auto",
  n = 10,
  manualGenes = c(),
  removeUnannotated = TRUE,
  labelSize = 3.5,
  pad = 1.4
)

Arguments

`rnaseqResult`	Data frame of RNASeq results, with Ensembl gene IDs as rownames. Can be a "DESeqResults" or "TopTags" object, or a simple data frame. See "Details" for more information.
`columnFC`	Character; Column to plot along the x-axis, typically log2 fold change values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`columnP`	Character; Column to plot along the y-axis, typically nominal or adjusted p values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`pCutoff`	Adjusted p value cutoff, defaults to < 0.05
`fcCutoff`	Absolute fold change cutoff, defaults to > 1.5
`labelCutoffs`	Logical; Should cutoff lines for p value and fold change be labeled? Size of the label is controlled by `labelSize`. Defaults to FALSE.
`baseColour`	Colour of points for all significant DE genes ("steelblue4")
`nonsigColour`	Colour of non-significant DE genes ("lightgrey")
`alpha`	Transparency of the points (0.5)
`pointSize`	Size of the points (1)
`title`	Title of the plot
`nonlog2`	Show non-log2 fold changes instead of log2 fold change (FALSE)
`xaxis`	Length-two numeric vector to manually specify limits of the x-axis in log2 fold change; defaults to NA which lets ggplot2 determine the best values.
`yaxis`	Length-two numeric vector to manually specify limits of the y-axis (in -log10). Defaults to NA which lets ggplot2 determine the best values.
`highlightGenes`	Vector of genes to emphasize by colouring differently (e.g. genes of interest). Must be Ensembl IDs.
`highlightColour`	Colour for the genes specified in `highlightGenes`
`highlightName`	Optional name to call the `highlightGenes` (e.g. Unique, Shared, Immune related, etc.)
`label`	When set to "auto" (default), label the top `n` up- and down-regulated DE genes. When set to "highlight", label top `n` up- and down-regulated genes provided in `highlightGenes`. When set to "manual" label a custom selection of genes provided in `manualGenes`.
`n`	number of top up- and down-regulated genes to label. Applies when `label` is set to "auto" or "highlight".
`manualGenes`	If `label="manual"`, these are the genes to be specifically label. Can be HGNC symbols or Ensembl gene IDs.
`removeUnannotated`	Boolean (TRUE): Remove genes without annotations (no HGNC symbol).
`labelSize`	Size of font for labels (3.5)
`pad`	Padding of labels; adjust this if the labels overlap

Details

The input to eruption() can be of class "DESeqResults" (from DESeq2), "TopTags" (edgeR), or a simple data frame. When providing either of the former, the columns to plot are automatically pulled ("log2FoldChange" and "padj" for DESeqResults, or "logFC" and "FDR" for TopTags). Otherwise, the arguments "columnFC" and "columnP" must be specified. If one wishes to override the default behaviour for "DESeqResults" or "TopTags" (e.g. plot nominal p values on the y-axis), convert those objects to data frames, then supply "columnFC" and "columnP".

The argument highlightGenes can be used to draw attention to a specific set of genes, e.g. those from a pathway of interest. Setting the argument label="highlight" will also mean those same genes (at least some of them) will be given labels, further emphasizing them in the volcano plot.

Since this function returns a ggplot object, further custom changes could be applied using the standard ggplot2 functions (labs(), theme(), etc.).

Value

Volcano plot of genes from an RNA-Seq experiment; a "ggplot" object

Examples

data("exampleDESeqResults")
eruption(rnaseqResult=exampleDESeqResults[[1]])

data("exampleDESeqResults")
eruption(rnaseqResult=exampleDESeqResults[[1]])

List of example results from DESeq2

Description

List of example results from DESeq2

Usage

data(exampleDESeqResults)
data(exampleDESeqResults)

Format

A list of two "DESeqResults" objects, each with 5000 rows and 6 columns:

baseMean: A combined score for the gene
log2FoldChange: Fold change value for the gene
lfcSE: Standard error for the fold change value
stat: The statistic value
pvalue: The nominal p value for the gene
padj: The adjusted p value for the gene

Value

An object of class "list"

Source

For details on DESeq2 and its data structures/methods, please see https://bioconductor.org/packages/DESeq2/

Calculate pairwise distances from a table of pathways and genes

Description

Given a data frame of pathways and their member genes, calculate the pairwise distances using a constructed identity matrix. Zero means two pathways are identical, while one means two pathways share no genes in common.

Usage

getPathwayDistances(pathwayData = sigoraDatabase, distMethod = "jaccard")
getPathwayDistances(pathwayData = sigoraDatabase, distMethod = "jaccard")

Arguments

`pathwayData`	Three column data frame of pathways and their constituent genes. Defaults to the provided `sigoraDatabase` object, but can be any set of Reactome pathways. Must contain Ensembl gene IDs in the first column, human Reactome pathway IDs in the second, and pathway descriptions in the third.
`distMethod`	Character; method used to determine pairwise pathway distances. Can be any option supported by `vegan::vegdist()`.

Value

Matrix of the pairwise pathway distances (dissimilarity) based on overlap of their constituent genes; object of class "matrix".

References

None.

Examples

# Here we'll use a subset of all the pathways, to save time
data("sigoraDatabase")

getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

# Here we'll use a subset of all the pathways, to save time
data("sigoraDatabase")

getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

Colour assignments for grouped pathways

Description

Colour assignments for grouped pathways

Usage

data(groupedPathwayColours)
data(groupedPathwayColours)

Format

A length 8 named vector of hex colour values

Value

An object of class "character"

Table of Hallmark gene sets and their genes

Description

Table of Hallmark gene sets and their genes

Usage

data(hallmarkDatabase)
data(hallmarkDatabase)

Format

A data frame (tibble) with 8,209 rows and 2 columns

pathwayId: Name of the Hallmark Gene Set
ensemblGeneId: Ensembl gene IDs

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

For more information on the MSigDB Hallmark gene sets, please see https://www.gsea-msigdb.org/gsea/msigdb/collections.jsp

InnateDB PPI data

Description

A data frame containing human PPI data from InnateDB, from the entry "All Experimentally Validated Interactions (updated weekly)" at https://innatedb.com/redirect.do?go=downloadImported. A few important steps have been taken to filter the data, namely the removal of duplicate interactions, and removing interactions that have the same components but are swapped between A and B.

Usage

data(innateDbPPI)
data(innateDbPPI)

Format

A data frame (tibble) with 152,256 rows and 2 columns:

ensemblGeneA: Ensembl gene ID for the first gene/protein in the interaction
ensemblGeneB: Ensembl gene ID for the second gene/protein in the interaction

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

For more details on the data sourced from InnateDB, please see their website: https://www.innatedb.com

Table of KEGG pathways and genes

Description

Table of KEGG pathways and genes

Usage

data(keggDatabase)
data(keggDatabase)

Format

A data frame (tibble) with 32883 rows and 4 columns

pathwayId: KEGG pathway ID
pathwayName: Name of the Reactome pathway
ensemblGeneId: Ensembl gene ID
hgncSymbol: HGNC gene symbol

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

See https://kegg.jp for more information.

Table of human gene ID mappings

Description

A data frame to aid in mapping human gene IDs between different formats, inclusing Ensembl IDs, HGNC symbols, and Entrez IDs. Mapping information was sourced using biomaRt and AnnotationDbi.

Usage

data(mappingFile)
data(mappingFile)

Format

A data frame (tibble) with 43,993 rows and 3 columns

ensemblGeneId: Ensembl IDs
hgncSymbol: HGNC symbols
entrezGeneId: NCBI Entrez IDs

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

See https://bioconductor.org/packages/biomaRt/ and https://bioconductor.org/packages/AnnotationDbi/ for information on each of the utilized packages and functions.

Create a pathway network from enrichment results and a pathway interaction foundation

Description

Creates a tidygraph network object from the provided pathway information, ready to be visualized with pathnetGGraph or pathnetVisNetwork.

Usage

pathnetCreate(
  pathwayEnrichmentResult,
  columnId = "pathwayId",
  columnP = "pValueAdjusted",
  foundation,
  trim = TRUE,
  trimOrder = 1
)
pathnetCreate(
  pathwayEnrichmentResult,
  columnId = "pathwayId",
  columnP = "pValueAdjusted",
  foundation,
  trim = TRUE,
  trimOrder = 1
)

Arguments

`pathwayEnrichmentResult`	Data frame of results from `pathwayEnrichment` run with Sigora or ReactomePA (should be based on Reactome data).
`columnId`	Character; column containing the Reactome pathway IDs. Defaults to "pathwayID".
`columnP`	Character; column containing the adjusted p values. Defaults to "pValueAdjusted".
`foundation`	List of pathway pairs to use in constructing a network. Typically this will be the output from `createFoundation`.
`trim`	Remove independent subgraphs which don't contain any enriched pathways (default is `TRUE`).
`trimOrder`	Order to use when removing subgraphs; Higher values will keep more non-enriched pathway nodes. Defaults to `1`.

Details

With the "trim" option enabled, nodes (pathways) and subgraphs which are not sufficiently connected to enriched pathways will be removed. How aggressively this is done can be controlled via the trimOrder argument, and the optimal value will depend on the number of enriched pathways and the number of interacting pathways (i.e. number of rows in "foundation").

Value

A pathway network as a "tidygraph" object, with the following columns for nodes:

`pathwayId`	Reactome pathway ID
`pathwayName`	Reactome pathway name
`comparison`	Name of source comparison, if this pathway was enriched
`direction`	Whether an enriched pathway was found in all genes or up- or down-regulated genes
`pValue`	Nominal p-value from the enrichment result
`pValueAdjusted`	Corrected p-value from the enrichment
`genes`	Candidate genes for the given pathway if it was enriched
`numCandidateGenes`	Number of candidate genes
`numBgGenes`	Number of background genes
`geneRatio`	Ratio of candidate and background genes
`totalGenes`	Total number of DE genes tested, for an enriched pathway
`topLevelPathway`	Highest level Reactome term for a given pathway
`groupedPathway`	Custom pathway category used in visualizations

For edges, the following information is also included:

`from`	Starting node (row number) for the edge
`to`	Ending node (row number) for the edge
`similarity`	Similarity of two nodes/pathways
`distance`	Inverse of similarity

Examples

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

Create the foundation for pathway networks using pathway distances

Description

From a "n by n" distance matrix, generate a table of interacting pathways to use in constructing a pathway network. The cutoff can be adjusted to have more or fewer edges in the final network, depending on the number of pathways involved, i.e. the number of enriched pathways you're trying to visualize.

The desired cutoff will also vary based on the distance measure used, so some trial-and-error may be needed to find an appropriate value.

Usage

pathnetFoundation(mat, maxDistance = NA, propToKeep = NA)
pathnetFoundation(mat, maxDistance = NA, propToKeep = NA)

Arguments

`mat`	Matrix of distances between pathways, i.e. 0 means two pathways are identical. Should match the output from `getPathwayDistances`.
`maxDistance`	Numeric distance cutoff (less than or equal) used to determine if two pathways should share an edge. Pathway pairs with a distance of 0 are always removed. One of `maxDistance` or `propToKeep` must be provided.
`propToKeep`	Top proportion of pathway pairs to keep as edges, ranked based distance. One of `maxDistance` or `propToKeep` must be provided.

Value

A "data.frame" (tibble) of interacting pathway pairs with the following columns:

`pathwayName1`	Name of the first pathway in the pair
`pathwayName2`	Name of the second pathway in the pair
`distance`	Distance measure for the two pathways
`pathway1`	Reactome ID for the first pathway in the pair
`pathway2`	Reactome ID for the first pathway in the pair

References

None.

Examples

data("sigoraDatabase")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

data("sigoraDatabase")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

Visualize enriched Reactome pathways as a static network

Description

Plots the network object generated from createPathnet, creating a visual representation of pathway similarity/interactions based on overlapping genes.

Usage

pathnetGGraph(
  network,
  networkLayout = "nicely",
  nodeSizeRange = c(4, 8),
  nodeBorderWidth = 1.5,
  nodeLabelSize = 5,
  nodeLabelColour = "black",
  nodeLabelAlpha = 0.67,
  nodeLabelOverlaps = 6,
  labelProp = 0.25,
  segColour = "black",
  edgeColour = "grey30",
  edgeWidthRange = c(0.33, 3),
  edgeAlpha = 1,
  themeBaseSize = 16
)
pathnetGGraph(
  network,
  networkLayout = "nicely",
  nodeSizeRange = c(4, 8),
  nodeBorderWidth = 1.5,
  nodeLabelSize = 5,
  nodeLabelColour = "black",
  nodeLabelAlpha = 0.67,
  nodeLabelOverlaps = 6,
  labelProp = 0.25,
  segColour = "black",
  edgeColour = "grey30",
  edgeWidthRange = c(0.33, 3),
  edgeAlpha = 1,
  themeBaseSize = 16
)

Arguments

`network`	Tidygraph network object, output from `createPathnet`.
`networkLayout`	Desired layout for the network visualization. Defaults to "nicely", but supports any method found in `?layout_tbl_graph_igraph`
`nodeSizeRange`	Size range for nodes, mapped to significance (Bonferroni p-value). Defaults to `c(4, 8)`.
`nodeBorderWidth`	Width of borders on nodes, defaults to 1.5
`nodeLabelSize`	Size of node labels; defaults to 5.
`nodeLabelColour`	Colour of the node labels; defaults to "black".
`nodeLabelAlpha`	Transparency of node labels. Defaults to `0.67`.
`nodeLabelOverlaps`	Max overlaps for node labels, from `ggrepel`. Defaults to `6`.
`labelProp`	Proportion of "interactor" (i.e. non-enriched) pathways that the function will attempt to label. E.g. setting this to 0.5 (the default) means half of the non-enriched pathways will potentially be labeled - it won't be exact because the node labeling is done with `ggrepel`.
`segColour`	Colour of line segments connecting labels to nodes. Defaults to "black".
`edgeColour`	Colour of network edges; defaults to "grey30".
`edgeWidthRange`	Range of edge widths, mapped to `log10(similarity)`. Defaults to `c(0.33, 3)`.
`edgeAlpha`	Alpha value for edges; defaults to `1`.
`themeBaseSize`	Base font size for all plot elements. Defaults to `16`.

Details

A note regarding node labels: The function tries to prioritize labeling enriched pathways (filled nodes), with the labelProp argument determining roughly how many of the remaining interactor pathways might get labels. You'll likely need to tweak this value, and try different seeds, to get the desired effect.

Value

A pathway network or "pathnet"; a plot object of class "ggplot"

References

None.

Examples

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

exPathnet <- pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

pathnetGGraph(
    exPathnet,
    labelProp=0.1,
    nodeLabelSize=4,
    nodeLabelOverlaps=8,
    segColour="red"
)

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

exPathnet <- pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

pathnetGGraph(
    exPathnet,
    labelProp=0.1,
    nodeLabelSize=4,
    nodeLabelOverlaps=8,
    segColour="red"
)

Visualize enriched Reactome pathways as an interactive network

Description

Plots the network object generated from createPathnet, creating a visual and interactive representation of similarities/ interactions between pathways using their overlapping genes.

Usage

pathnetVisNetwork(
  network,
  networkLayout = "layout_nicely",
  nodeSizeRange = c(20, 50),
  nodeBorderWidth = 2.5,
  labelNodes = TRUE,
  nodeLabelSize = 60,
  nodeLabelColour = "black",
  edgeColour = "#848484",
  edgeWidthRange = c(5, 20),
  highlighting = TRUE
)
pathnetVisNetwork(
  network,
  networkLayout = "layout_nicely",
  nodeSizeRange = c(20, 50),
  nodeBorderWidth = 2.5,
  labelNodes = TRUE,
  nodeLabelSize = 60,
  nodeLabelColour = "black",
  edgeColour = "#848484",
  edgeWidthRange = c(5, 20),
  highlighting = TRUE
)

Arguments

`network`	Tidygraph network object as output by `createPathnet`
`networkLayout`	Desired layout for the network visualization. Defaults to "layout_nicely", and should support most igraph layouts. See `?visIgraphLayout` for more details.
`nodeSizeRange`	Node size is mapped to the negative log of the Bonferroni-adjusted p value, and this length-two numeric vector controls the minimum and maximum. Defaults to `c(20, 50)`.
`nodeBorderWidth`	Size of the node border, defaults to 2.5
`labelNodes`	Boolean determining if nodes should be labeled. Note it will only ever label enriched nodes/pathways.
`nodeLabelSize`	Size of the node labels in pixels; defaults to 60.
`nodeLabelColour`	Colour of the node labels; defaults to "black".
`edgeColour`	Colour of network edges; defaults to "#848484".
`edgeWidthRange`	Edge width is mapped to the similarity measure (one over distance). This length-two numeric vector controls the minimum and maximum width of edges. Defaults to `c(5, 20)`.
`highlighting`	When clicking on a node, should directly neighbouring nodes be highlighted (other nodes are dimmed)? Defaults to TRUE.

Details

This function makes use of the visNetwork library, which allows for various forms of interactivity, such as including text when hovering over nodes, node selection and dragging (including multiple selections), and highlighting nodes belonging to a larger group (e.g. top-level Reactome category).

Value

An interactive pathway, network or "pathnet"; object of class "visNetwork"

References

https://datastorm-open.github.io/visNetwork/

Examples

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

exPathnet <- pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

pathnetVisNetwork(exPathnet)

data("sigoraDatabase", "sigoraExamples")

pathwayDistancesJaccard <- getPathwayDistances(
    pathwayData=dplyr::slice_head(
        dplyr::arrange(sigoraDatabase, pathwayId),
        prop=0.05
    ),
    distMethod="jaccard"
)

startingPathways <- pathnetFoundation(
    mat=pathwayDistancesJaccard,
    maxDistance=0.8
)

exPathnet <- pathnetCreate(
    pathwayEnrichmentResult=sigoraExamples[grepl(
        "Pos",
        sigoraExamples$comparison
    ), ],
    foundation=startingPathways,
    trim=TRUE,
    trimOrder=1
)

pathnetVisNetwork(exPathnet)

Top-level pathway categories

Description

A data frame containing all Reactome, Hallmark, and KEGG pathways/terms, along with a manually-curated top-level category for each entry.

Usage

data(pathwayCategories)
data(pathwayCategories)

Format

A data frame (tibble) with 3326 rows and 5 columns

pathwayId: Reactome, Hallmark, or KEGG pathway identifier
pathwayName: Pathway name
topLevelPathway: Top hierarchy pathway term, shortened in some cases
groupedPathway: Top grouped pathway
topLevelOriginal: Original top pathway name

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

See https://reactome.org/, https://www.gsea-msigdb.org/gsea/msigdb/collections.jsp, and https://kegg.jp for information on each of these databases.

Test significant DE genes for enriched pathways

Description

This function provides a simple and consistent interface to three different pathway enrichment tools: Sigora and ReactomePA (which both test for Reactome pathways), and MSigDB Hallmark gene set enrichment.

Usage

pathwayEnrichment(
  inputList,
  columnFC = NA,
  columnP = NA,
  filterInput = TRUE,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  split = TRUE,
  analysis = "sigora",
  filterResults = "default",
  gpsRepo = "reaH",
  gpsLevel = "default",
  geneUniverse = NULL,
  verbose = FALSE
)
pathwayEnrichment(
  inputList,
  columnFC = NA,
  columnP = NA,
  filterInput = TRUE,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  split = TRUE,
  analysis = "sigora",
  filterResults = "default",
  gpsRepo = "reaH",
  gpsLevel = "default",
  geneUniverse = NULL,
  verbose = FALSE
)

Arguments

`inputList`	A list, with each element containing RNA-Seq results as a "DESeqResults", "TopTags", or "data.frame" object. Rownames of each table must contain Ensembl Gene IDs. The list names are used as the comparison name for each element (e.g. "COVID vs Healthy"). See Details for more information on supported input types.
`columnFC`	Character; Column to plot along the x-axis, typically log2 fold change values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`columnP`	Character; Column to plot along the y-axis, typically nominal or adjusted p values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`filterInput`	When providing list of data frames containing the unfiltered RNA-Seq results (i.e. not all genes are significant), set this to `TRUE` to remove non-significant genes using the thresholds set by the `pCutoff` and `fcCutoff`. When this argument is `FALSE` its assumed your passing a pre-filtered data in `inputList`, and no more filtering will be done.
`pCutoff`	Adjusted p value cutoff when filtering. Defaults to < 0.05.
`fcCutoff`	Minimum absolute fold change value when filtering. Defaults to > 1.5
`split`	Boolean (TRUE); Split into up- and down-regulated DE genes using the fold change column, and do enrichment independently on each. Results are combined at the end, with an added "direction" column.
`analysis`	Method/database to use for enrichment analysis. The default is "sigora", but can also be "reactome"/"reactomepa", "hallmark", "kegg", "fgsea_reactome" or "fgsea_hallmark".
`filterResults`	Should the output be filtered for significance? Use `1` to return the unfiltered results, or any number less than 1 for a custom p-value cutoff. If left as `default`, the significance cutoff for `analysis="sigora"` is 0.001, or 0.05 for "reactome", "hallmark", and "kegg".
`gpsRepo`	Only applies to `analysis="sigora"`. Gene Pair Signature (GPS) object for Sigora to use to test for enriched pathways. "reaH" (default) will use the Reactome GPS object from `Sigora`; "kegH" will use the KEGG GPS. One can also provide their own GPS object; see Sigora's documentation for details.
`gpsLevel`	Only applies to `analysis="sigora"`. If left as `default`, will be set to `4` for `gpsRepo="reaH"` or `2` for `gpeRepo="kegH"`. If providing your own GPS object, can be set as desired; see Sigora's documentation for details.
`geneUniverse`	Only applies when `analysis` is "reactome"/"reactomepa", "hallmark", or "kegg". The set of background genes to use when testing with Reactome, Hallmark, or KEGG gene sets. For Reactome this must be a character vector of Entrez genes. For Hallmark or KEGG, it must be Ensembl IDs.
`verbose`	Logical; If FALSE (the default), don't print info/progress messages.

Details

inputList must be a named list of RNA-Seq results, with each element being of class "DESeqResults" from DESeq2, "TopTags" from edgeR, or a simple data frame. For the first two cases, column names are expected to be the standard defined by each class ("log2FoldChange" and "padj" for "DESeqResults", and "logFC" and "FDR" for "TopTags"). Hence for these two cases the arguments columnFC and columnP can be left as NA.

In the last case (elements are "data.frame"), both columnFC and columnP must be supplied when filterInput=TRUE, and columnFC must be given if split=TRUE.

Setting analysis to any of "reactome", "reactomepa", "hallmark", or "kegg" will execute traditional over-representation analysis, the only difference being the database used ("reactome" and "reactomepa" are treated the same). Setting analysis="sigora" will use a gene pair-based approach, which can be performed on either Reactome data when gpsRepo="reaH" or KEGG data with gpsRepo="kegH".

Value

A "data.frame" (tibble) of pathway enrichment results for all input comparisons, with the following columns:

`comparison`	Source comparison from the names of `inputList`
`direction`	Whether the pathway was enriched in all genes (`split=FALSE`), or up- or down-regulated genes (`split=TRUE`)
`pathwayId`	Pathway identifier
`pathwayName`	Pathway name
`pValue`	Nominal p value for the pathway
`pValueAdjusted`	p value, corrected for multiple testing
`genes`	Candidate genes, which were DE for the comparison and also in the pathway
`numCandidateGenes`	Number of candidate genes
`numBgGenes`	Number of background genes for the pathway
`geneRatio`	Ratio of candidate and background genes
`totalGenes`	Number of DE genes which were tested for enriched pathways
`topLevelPathway`	High level Reactome term which serves to group similar pathways

References

Sigora: https://cran.r-project.org/package=sigora ReactomePA: https://www.bioconductor.org/packages/ReactomePA/ Reactome: https://reactome.org/ MSigDB/Hallmark: https://www.gsea-msigdb.org/gsea/msigdb/collections.jsp KEGG: https://www.kegg.jp/

Examples

data("exampleDESeqResults")

pathwayEnrichment(
    inputList=exampleDESeqResults[1],
    filterInput=TRUE,
    split=TRUE,
    analysis="hallmark",
    filterResults="default"
)

data("exampleDESeqResults")

pathwayEnrichment(
    inputList=exampleDESeqResults[1],
    filterInput=TRUE,
    split=TRUE,
    analysis="hallmark",
    filterResults="default"
)

Plot pathway enrichment results

Description

Creates a plot to visualize and compare pathway enrichment results from multiple DE comparisons. Can automatically assign each pathway into an informative top-level category.

Usage

pathwayPlots(
  pathwayEnrichmentResults,
  columns = 1,
  specificTopPathways = "any",
  specificPathways = "any",
  colourValues = c("blue", "red"),
  nameWidth = 35,
  nameRows = 1,
  xAngle = "angled",
  maxPVal = 50,
  intercepts = NA,
  includeGeneRatio = FALSE,
  size = 4,
  legendMultiply = 1,
  showNumGenes = FALSE,
  pathwayPosition = "right",
  newGroupNames = NA,
  fontSize = 12
)
pathwayPlots(
  pathwayEnrichmentResults,
  columns = 1,
  specificTopPathways = "any",
  specificPathways = "any",
  colourValues = c("blue", "red"),
  nameWidth = 35,
  nameRows = 1,
  xAngle = "angled",
  maxPVal = 50,
  intercepts = NA,
  includeGeneRatio = FALSE,
  size = 4,
  legendMultiply = 1,
  showNumGenes = FALSE,
  pathwayPosition = "right",
  newGroupNames = NA,
  fontSize = 12
)

Arguments

`pathwayEnrichmentResults`	Data frame of results from the function `enrichPathway`
`columns`	Number of columns to split the pathways across, particularly relevant if there are many significant pathways. Can specify up to 3 columns, with a default of 1.
`specificTopPathways`	Only plot pathways from a specific vector of "topLevelPathway". Defaults to "any" which includes all pathway results, or see `unique(pathwayEnrichmentResults$topLevelPathway)` (i.e. the input) for possible values.
`specificPathways`	Only plot specific pathways. Defaults to "any".
`colourValues`	Length-two character vector of colours to use for the scale. Defaults to `c("blue", "red")`.
`nameWidth`	How many characters to show for pathway name before truncating? Defaults to 35.
`nameRows`	For pathway names (y axis), how many rows (lines) should names wrap across when they're too long? Defaults to 1.
`xAngle`	Angle of x axis labels, set to "angled" (45 degrees), "horizontal" (0 degrees), or "vertical" (90 degrees).
`maxPVal`	P values below `10 ^ -maxPVal` will be set to that value.
`intercepts`	Add vertical lines to separate different groupings, by providing a vector of intercepts (e.g. `c(1.5, 2.5)`). Defaults to `NA`.
`includeGeneRatio`	Boolean (FALSE). Should the gene ratio be included as an aesthetic mapping?If so, then it is attributed to the size of the triangles.
`size`	Size of points if not scaling to gene ratio. Defaults to 4.
`legendMultiply`	Size of the legend, e.g. increase if there are a lot of pathways which makes the legend small and unreadable by comparison. Defaults to 1, i.e. no increase in legend size.
`showNumGenes`	Boolean, defaults to FALSE. Show the number of genes for each comparison as brackets under the comparison's name.
`pathwayPosition`	Whether to have the y-axis labels (pathway names) on the left or right side. Default is "right".
`newGroupNames`	If you want to change the names of the comparisons to different names. Input a vector in the order as they appear.
`fontSize`	Base font size for all text elements of the plot. Defaults to 12.

Value

A plot of enriched pathways; a "ggplot" object

Examples

data("sigoraExamples")
pathwayPlots(sigoraExamples, columns=2)

data("sigoraExamples")
pathwayPlots(sigoraExamples, columns=2)

Create a heatmap of fold changes to visualize RNA-Seq results

Description

Creates a heatmap of fold changes values for results from RNA-Seq results, with various parameters to tweak the appearance.

Usage

plotFoldChange(
  inputList,
  columnFC = NA,
  columnP = NA,
  pathName = NA,
  pathId = NA,
  genesToPlot = NA,
  manualTitle = NA,
  titleSize = 14,
  geneFormat = "ensembl",
  pCutoff = 0.05,
  fcCutoff = 1.5,
  cellColours = c("blue", "white", "red"),
  cellBorder = gpar(col = "grey"),
  plotSignificantOnly = TRUE,
  showStars = TRUE,
  hideNonsigFC = TRUE,
  vjust = 0.75,
  rot = 0,
  invert = FALSE,
  log2FoldChange = FALSE,
  colSplit = NA,
  clusterRows = TRUE,
  clusterColumns = FALSE,
  colAngle = 90,
  colCenter = TRUE,
  rowAngle = 0,
  rowCenter = FALSE
)
plotFoldChange(
  inputList,
  columnFC = NA,
  columnP = NA,
  pathName = NA,
  pathId = NA,
  genesToPlot = NA,
  manualTitle = NA,
  titleSize = 14,
  geneFormat = "ensembl",
  pCutoff = 0.05,
  fcCutoff = 1.5,
  cellColours = c("blue", "white", "red"),
  cellBorder = gpar(col = "grey"),
  plotSignificantOnly = TRUE,
  showStars = TRUE,
  hideNonsigFC = TRUE,
  vjust = 0.75,
  rot = 0,
  invert = FALSE,
  log2FoldChange = FALSE,
  colSplit = NA,
  clusterRows = TRUE,
  clusterColumns = FALSE,
  colAngle = 90,
  colCenter = TRUE,
  rowAngle = 0,
  rowCenter = FALSE
)

Arguments

`inputList`	A list, with each element containing RNA-Seq results as a "DESeqResults", "TopTags", or "data.frame" object, with Ensembl gene IDs in the rownames. The list names are used as the comparison name for each dataframe (e.g. "COVID vs Healthy"). See Details for more information on supported input types.
`columnFC`	Character; Column to plot along the x-axis, typically log2 fold change values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`columnP`	Character; Column to plot along the y-axis, typically nominal or adjusted p values. Only required when `rnaseqResult` is a simple data frame. Defaults to NA.
`pathName`	The name of a Reactome pathway to pull genes from, also used for the plot title. Alternative to `pathID`.
`pathId`	ID of a Reactome pathway to pull genes from. Alternative to `pathName`.
`genesToPlot`	Vector of Ensembl gene IDs you want to plot, instead of pulling the genes from a pathway, i.e. this option and `pathName`/`pathID` are mutually exclusive.
`manualTitle`	Provide your own title, and override the use of a pathway name the title.
`titleSize`	Font size for the title.
`geneFormat`	Type of genes given in `genesToPlot`. Default is Ensembl gene IDs ("ensembl"), but can also input a vector of HGNC symbols ("hgnc").
`pCutoff`	P value cutoff, default is <0.05
`fcCutoff`	Absolute fold change cutoff, default is >1.5
`cellColours`	Vector specifying desired colours to use for the cells in the heatmap. Defaults to `c("blue", "white", "red")`.
`cellBorder`	A call to `grid::gpar()` to specify borders between cells in the heatmap. The default is `gpar(col="grey")`. To remove borders set to `gpar(col=NA)`
`plotSignificantOnly`	Boolean (TRUE). Only plot genes that are differentially expressed (i.e. they pass `pCutoff` and `fcCutoff`) in any comparison from the provided list of data frames.
`showStars`	Boolean (TRUE) show significance stars on the heatmap
`hideNonsigFC`	Boolean (TRUE). If a gene is significant in one comparison but not in another, this will set the colour of the non- significant gene as grey to visually emphasize the significant genes. If set to FALSE, it will be set the colour to the fold change, and if the p value passes `pCutoff`, it will also display the p value (the asterisks will be grey instead of black).
`vjust`	Adjustment of the position of the significance stars. Default is 0.75. May need to adjust if there are many genes.
`rot`	Rotation of the position of the significance stars. Default is 0.
`invert`	Boolean (FALSE). The default setting plots genes as rows and comparisons as columns. Setting this to `TRUE` will place genes as columns and comparisons as rows.
`log2FoldChange`	Boolean (FALSE). Default plots the fold changes in the legend as the true fold change. Set to TRUE if you want log2 fold change.
`colSplit`	A vector, with the same length as `inputList`, which assigns each data frame in `inputList` to a group, and splits the heatmap on these larger groupings. The order of groups in the heatmap will be carried over, so one can alter the order of `inputList` and `colSplit` to affect the heatmap. This argument will be ignored if `clusterColumns` is set to TRUE. See Details for more information.
`clusterRows`	Boolean (TRUE). Whether to cluster the rows (genes). May need to change if `invert=TRUE`.
`clusterColumns`	Boolean (FALSE). Whether to cluster the columns (comparisons). Will override order of `colSplit` if set to TRUE. May need to change if `invert=TRUE`.
`colAngle`	Angle of column text. Defaults to 90.
`colCenter`	Whether to center column text. Default is TRUE, but it should be set to FALSE if the column name is angled (e.g. `colAngle=45`).
`rowAngle`	Angle of row text, defaults to 0.
`rowCenter`	Whether to center column text. The default is FALSE, but it should be set to TRUE if vertical column name (e.g. `rowAngle=90`).

Details

All elements of inputList should belong to one of the following classes: "DESeqResults" from DESeq2, "TopTags" from edgeR, or a simple "data.frame". In the first two cases, the proper columns for fold change and p values are detected automatically ("log2FoldChange" and "padj" for "DESeqResults", or "logFC" and "FDR" for "TopTags"). In the third case, the arguments columnFC and columnP must be supplied. Additionally, if one wished to override the default columns for either "DESeqResults" or "TopTags" objects, simply coerce the object to a simple "data.frame" and supply columnFC and columnP as desired.

The cellColours argument is designed to map a range of negative and positive values to the three provided colours, with zero as the middle colour. If the plotted matrix contains only positive (or negative) values, then it will become a two-colour scale, white-to-red (or blue-to-white).

The colSplit argument can be used to define larger groups represented in inputList. For example, consider an experiment comparing two different treatments to an untreated control, in both wild type and mutant cells. This would give the following comparisons: "wildtype_treatment1_vs_untreated", "wildtype_treatment2_vs_untreated", "mutant_treatment1_vs_untreated", and "mutant_treatment2_vs_untreated". One could then specify colSplit as c("Wild type", "Wild type", "Mutant", "Mutant") to make the wild type and mutant results more visually distinct.

Value

A heatmap of fold changes for genes of interest; an "ggplot" class object

References

https://bioconductor.org/packages/ComplexHeatmap/

Examples

data("exampleDESeqResults")

plotFoldChange(
    exampleDESeqResults,
    pathName="Generation of second messenger molecules"
)

data("exampleDESeqResults")

plotFoldChange(
    exampleDESeqResults,
    pathName="Generation of second messenger molecules"
)

Construct a PPI network from input genes and InnateDB's database

Description

Creates a protein-protein interaction (PPI) network using data from InnateDB, with options for network order, and filtering input.

Usage

ppiBuildNetwork(
  rnaseqResult,
  filterInput = TRUE,
  columnFC = NA,
  columnP = NA,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  order = "zero",
  hubMeasure = "betweenness",
  ppiData = innateDbPPI
)
ppiBuildNetwork(
  rnaseqResult,
  filterInput = TRUE,
  columnFC = NA,
  columnP = NA,
  pCutoff = 0.05,
  fcCutoff = 1.5,
  order = "zero",
  hubMeasure = "betweenness",
  ppiData = innateDbPPI
)

Arguments

`rnaseqResult`	An object of class "DESeqResults", "TopTags", or a simple data frame. See Details for more information on input types.
`filterInput`	If providing list of data frames containing the unfiltered output from `DESeq2::results()`, set this to TRUE to filter for DE genes using the thresholds set by the `pCutoff` and `fcCutoff` arguments. When FALSE it's assumed your passing the filtered results into `inputList` and no more filtering will be done.
`columnFC`	Character; optional column containing fold change values, used only when `filterInput=TRUE` and the input is a data frame.
`columnP`	Character; optional column containing p values, used only when `filterInput=TRUE` and the input is a data frame.
`pCutoff`	Adjusted p value cutoff, defaults to <0.05
`fcCutoff`	Absolute fold change cutoff, defaults to an absolute value of >1.5
`order`	Desired network order. Possible options are "zero" (default), "first," "minSimple."
`hubMeasure`	Character denoting what measure should be used in determining which nodes to highlight as hubs when plotting the network. Options include "betweenness" (default), "degree", and "hubscore". These represent network statistics calculated by their respective `tidygraph::centrality_x`, functions.
`ppiData`	Data frame of PPI data; must contain rows of interactions as pairs of Ensembl gene IDs, with columns named "ensemblGeneA" and "ensemblGeneB". Defaults to pre-packaged InnateDB PPI data.

Details

The input to ppiBuildNetwork() can be a "DESeqResults" object (from DESeq2), "TopTags" (edgeR), or a simple data frame. When not providing a basic data frame, the columns for filtering are automatically pulled ("log2FoldChange" and "padj" for DESeqResults, or "logFC" and "FDR" for TopTags). Otherwise, the arguments "columnFC" and "columnP" must be specified.

The "hubMeasure" argument determines how ppiBuildNetwork assesses connectedness of nodes in the network, which will be used to highlight nodes when visualizing with ppiPlotNetwork. The options are "degree", "betweenness", or "hubscore". This last option uses the igraph implementation of the Kleinburg hub centrality score - details on this method can be found at ?igraph::hub_score.

Value

A Protein-Protein Interaction (PPI) network; a "tidygraph" object for plotting or further analysis, with the minimum set of columns for nodes (additional columns from the input will also be included):

`name`	Ensembl gene ID for the node
`degree`	Degree of the node, i.e. the number of interactions
`betweenness`	Betweenness measure for the node
`seed`	TRUE when the node was part of the input list of genes
`hubScore`	Special hubScore for each node. The suffix denotes the measure being used; e.g. "hubScoreBtw" is for betweenness
`hgncSymbol`	HGNC gene name for the node

Additionally the following columns are provided for edges:

`from`	Starting node for the interaction/edge as a row number
`to`	Ending node for the interaction/edge as a row number

References

InnateDB: https://www.innatedb.com/

Examples

data("exampleDESeqResults")

ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

data("exampleDESeqResults")

ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

Clean GraphML or JSON input

Description

Takes network file (GraphML or JSON) and process it into a tidygraph object, adding network statistics along the way.

Usage

ppiCleanNetwork(network)
ppiCleanNetwork(network)

Arguments

network

tidygraph object from a GraphML or JSON file

Details

This function was designed so that networks created by other packages or websites (e.g. https://networkanalyst.ca) could be imported and visualized with ppiPlotNetwork.

Value

A Protein-Protein Interaction (PPI) network; a "tidygraph" object, with the minimal set of columns (other from the input are also included):

`name`	Identifier for the node
`degree`	Degree of the node, i.e. the number of interactions
`betweenness`	Betweenness measure for the node
`seed`	TRUE when the node was part of the input list of genes
`hubScore`	Special hubScore for each node. The suffix denotes the measure being used; e.g. "hubScoreBtw" is for betweenness
`hgncSymbol`	HGNC gene name for the node

Additionally the following columns are provided for edges:

`from`	Starting node for the interaction/edge as a row number
`to`	Ending node for the interaction/edge as a row number

Examples

tj1 <- jsonlite::read_json(
    system.file("extdata/networkAnalystExample.json", package="pathlinkR"),
    simplifyVector=TRUE
)

tj2 <- igraph::graph_from_data_frame(
    d=dplyr::select(tj1$edges, source, target),
    directed=FALSE,
    vertices=dplyr::select(
        tj1$nodes,
        id,
        label,
        x,
        y,
        "types"=molType,
        expr
    )
)

tj3 <- ppiCleanNetwork(tidygraph::as_tbl_graph(tj2))

tj1 <- jsonlite::read_json(
    system.file("extdata/networkAnalystExample.json", package="pathlinkR"),
    simplifyVector=TRUE
)

tj2 <- igraph::graph_from_data_frame(
    d=dplyr::select(tj1$edges, source, target),
    directed=FALSE,
    vertices=dplyr::select(
        tj1$nodes,
        id,
        label,
        x,
        y,
        "types"=molType,
        expr
    )
)

tj3 <- ppiCleanNetwork(tidygraph::as_tbl_graph(tj2))

Test a PPI network for enriched pathways

Description

Test a PPI network for enriched pathways

Usage

ppiEnrichNetwork(
  network,
  analysis = "sigora",
  filterResults = "default",
  gpsRepo = "default",
  geneUniverse = NULL
)
ppiEnrichNetwork(
  network,
  analysis = "sigora",
  filterResults = "default",
  gpsRepo = "default",
  geneUniverse = NULL
)

Arguments

`network`	A "tidygraph" network object, with Ensembl IDs in the first column of the node table
`analysis`	Default is "sigora", but can also be "reactomepa" or "hallmark"
`filterResults`	Should the output be filtered for significance? Use `1` to return the unfiltered results, or any number less than 1 for a custom p-value cutoff. If left as `default`, the significance cutoff for Sigora is 0.001, or 0.05 for ReactomePA and Hallmark.
`gpsRepo`	Only applies to `analysis="sigora"`. Gene Pair Signature object for Sigora to use to test for enriched pathways. Leaving this set as "default" will use the "reaH" GPS object from `Sigora`, or you can provide your own custom GPS repository.
`geneUniverse`	Only applies when `analysis` is "reactomepa" or "hallmark". The set of background genes to use when testing with ReactomePA or Hallmark gene sets. For ReactomePA this must be a character vector of Entrez genes. For Hallmark, it must be Ensembl IDs.

Value

A "data.frame" (tibble) of enriched pathways, with the following columns:

`pathwayId`	Pathway identifier
`pathwayName`	Pathway name
`pValue`	Nominal p value for the pathway
`pValueAdjusted`	p value corrected for multiple testing
`genes`	Candidate genes, which were DE for the comparison and also in the pathway
`numCandidateGenes`	Number of candidate genes
`numBgGenes`	Number of background genes for the pathway
`geneRatio`	Ratio of candidate and background genes
`totalGenes`	Number of DE genes which were tested for enriched pathways
`topLevelPathway`	High level Reactome term which serves to group similar pathways

References

Sigora: https://cran.r-project.org/package=sigora ReactomePA: https://www.bioconductor.org/packages/ReactomePA/ MSigDB/Hallmark: https://www.gsea-msigdb.org/gsea/msigdb/collections.jsp

Examples

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

ppiEnrichNetwork(
    network=exNetwork,
    analysis="hallmark"
)

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

ppiEnrichNetwork(
    network=exNetwork,
    analysis="hallmark"
)

Extract a subnetwork based on pathway genes

Description

Extract a subnetwork based on pathway genes

Usage

ppiExtractSubnetwork(
  network,
  genes = NULL,
  pathwayEnrichmentResult = NULL,
  pathwayToExtract
)
ppiExtractSubnetwork(
  network,
  genes = NULL,
  pathwayEnrichmentResult = NULL,
  pathwayToExtract
)

Arguments

`network`	Input network object; output from `ppiBuildNetwork()`
`genes`	List of Ensembl gene IDs to use as the starting point to extract a subnetwork from the initial network. You must provide either the `genes` or `pathwayEnrichmentResult` argument.
`pathwayEnrichmentResult`	Pathway enrichment result, output from `ppiEnrichNetwork`. You must provide either `genes` or `pathwayEnrichmentResult` argument.
`pathwayToExtract`	Name of the pathway determining what genes (nodes) are pulled from the input network. Must be present in the "pathwayName" column of `pathwayEnrichmentResults`.

Details

Uses functions from the igraph package to extract a minimally connected subnetwork from the starting network, using either a list of Ensembl genes or genes from an enriched pathway as the basis. To see what genes were pulled out for the pathway, see the "starters" attribute of the output network.

Value

`name`	Ensembl gene ID for the node
`degree`	Degree of the node, i.e. the number of interactions
`betweenness`	Betweenness measure for the node
`seed`	TRUE when the node was part of the input list of genes
`hubScore`	Special hubScore for each node. The suffix denotes the measure being used; e.g. "hubScoreBtw" is for betweenness
`hgncSymbol`	HGNC gene name for the node

Additionally the following columns are provided for edges:

`from`	Starting node for the interaction/edge as a row number
`to`	Ending node for the interaction/edge as a row number

References

Code for network module (subnetwork) extraction was based off of that used in "jboktor/NetworkAnalystR" on Github.

Examples

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

exPathways <- ppiEnrichNetwork(
    network=exNetwork,
    analysis="hallmark"
)

ppiExtractSubnetwork(
    network=exNetwork,
    pathwayEnrichmentResult=exPathways,
    pathwayToExtract="INTERFERON ALPHA RESPONSE"
)

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

exPathways <- ppiEnrichNetwork(
    network=exNetwork,
    analysis="hallmark"
)

ppiExtractSubnetwork(
    network=exNetwork,
    pathwayEnrichmentResult=exPathways,
    pathwayToExtract="INTERFERON ALPHA RESPONSE"
)

Plot an undirected PPI network using ggraph

Description

Visualize a protein-protein interaction (PPI) network using ggraph functions, output from ppiBuildNetwork.

Usage

ppiPlotNetwork(
  network,
  networkLayout = "nicely",
  title = NA,
  nodeSize = c(2, 6),
  fillColumn,
  fillType,
  catFillColours = "Set1",
  foldChangeColours = c("firebrick3", "#188119"),
  intColour = "grey70",
  nodeBorder = "grey30",
  hubColour = "blue2",
  subnetwork = TRUE,
  legend = FALSE,
  legendTitle = NULL,
  edgeColour = "grey40",
  edgeAlpha = 0.5,
  edgeWidth = 0.5,
  label = FALSE,
  labelColumn,
  labelFilter = 5,
  labelSize = 4,
  labelColour = "black",
  labelFace = "bold",
  labelPadding = 0.25,
  minSegLength = 0.25
)
ppiPlotNetwork(
  network,
  networkLayout = "nicely",
  title = NA,
  nodeSize = c(2, 6),
  fillColumn,
  fillType,
  catFillColours = "Set1",
  foldChangeColours = c("firebrick3", "#188119"),
  intColour = "grey70",
  nodeBorder = "grey30",
  hubColour = "blue2",
  subnetwork = TRUE,
  legend = FALSE,
  legendTitle = NULL,
  edgeColour = "grey40",
  edgeAlpha = 0.5,
  edgeWidth = 0.5,
  label = FALSE,
  labelColumn,
  labelFilter = 5,
  labelSize = 4,
  labelColour = "black",
  labelFace = "bold",
  labelPadding = 0.25,
  minSegLength = 0.25
)

Arguments

`network`	A `tidygraph` object, output from `ppiBuildNetwork`
`networkLayout`	Layout of nodes in the network. Supports all layouts from `ggraph`/`igraph`, or a data frame of x and y coordinates for each node (order matters!).
`title`	Optional title for the plot (NA)
`nodeSize`	Length-two numeric vector, specifying size range of node sizes (maps to node degree). Default is `c(2, 6)`.
`fillColumn`	Tidy-select column for mapping node colour. Designed to handle continuous numeric mappings (either positive/negative only, or both), and categorical mappings, plus a special case for displaying fold changes from, for example, RNA-Seq data. See `fillType` for more details on how to set this up.
`fillType`	String denoting type of fill mapping to perform for nodes. Options are: "foldChange", "twoSided", "oneSided", or "categorical".
`catFillColours`	Colour palette to be used when `fillType` is set to "categorical." Defaults to "Set1" from RColorBrewer. Will otherwise be passed as the "values" argument in `scale_fill_manual()`.
`foldChangeColours`	A two-length character vector containing colours for up and down regulated genes. Defaults to `c("firebrick3", "#188119")`.
`intColour`	Fill colour for non-seed nodes, i.e. interactors. Defaults to "grey70".
`nodeBorder`	Colour (stroke or outline) of all nodes in the network. Defaults to "grey30".
`hubColour`	Colour of node labels for hubs. The top 2% of nodes (based on calculated hub score) are highlighted with this colour, if `label=TRUE`.
`subnetwork`	Logical determining if networks from `ppiExtractSubnetwork()` should be treated as such. Defaults to TRUE.
`legend`	Should a legend be included? Defaults to FALSE.
`legendTitle`	Optional title for the legend, defaults to `NULL`.
`edgeColour`	Edge colour, defaults to "grey40"
`edgeAlpha`	Transparency of edges, defaults to 0.5
`edgeWidth`	Thickness of edges connecting nodes. Defaults to 0.5
`label`	Boolean, whether labels should be added to nodes. Defaults to FALSE.
`labelColumn`	Tidy-select column of the network/data to be used in labeling nodes. Recommend setting to `hgncSymbol`, which contains HGNC symbols mapped from the input Ensembl IDs via biomaRt.
`labelFilter`	Degree filter used to determine which nodes should be labeled. Defaults to 5. This value can be increased to reduce the number of node labels, to prevent the network from being too crowded.
`labelSize`	Size of node labels, defaults to 5.
`labelColour`	Colour of node labels, defaults to "black"
`labelFace`	Font face for node labels, defaults to "bold"
`labelPadding`	Padding around the label, defaults to 0.25 lines.
`minSegLength`	Minimum length of lines to be drawn from labels to points. The default specified here is 0.25, half of the normal default value.

Details

Any layout supported by ggraph can be specified here - see ?layout_tbl_graph_igraph for a list of options. Or you can supply a data frame containing coordinates for each node. The first and second columns will be used for x and y, respectively. Note that having columns named "x" and "y" in the input network will generate a warning message when supplying custom coordinates.

Since this function returns a standard ggplot object, you can tweak the final appearance using the normal array of ggplot2 function, e.g. labs() and theme() to further customize the final appearance.

The fillType argument will determine how the node colour is mapped to the desired column. "foldChange" represents a special case, where the fill column is numeric and whose values should be mapped to up (> 0) or down (< 0). "twoSided" and "oneSided" are designed for numeric data that contains either positive and negative values, or only positive/negative values, respectively. "categorical" handles any other non-numeric colour mapping, and uses "Set1" from RColorBrewer.

Node statistics (degree, betweenness, and hub score) are calculated using the respective functions from the tidygraph package.

Value

A Protein-Protein Interaction (PPI) network plot; an object of class "ggplot"

Examples

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

ppiPlotNetwork(
    network=exNetwork,
    title="COVID positive over time",
    fillColumn=LogFoldChange,
    fillType="foldChange",
    legend=TRUE,
    label=FALSE
)

data("exampleDESeqResults")

exNetwork <- ppiBuildNetwork(
    rnaseqResult=exampleDESeqResults[[1]],
    filterInput=TRUE,
    order="zero"
)

ppiPlotNetwork(
    network=exNetwork,
    title="COVID positive over time",
    fillColumn=LogFoldChange,
    fillType="foldChange",
    legend=TRUE,
    label=FALSE
)

INTERNAL Find and return the largest subnetwork

Description

INTERNAL Find and return the largest subnetwork

Usage

ppiRemoveSubnetworks(network)
ppiRemoveSubnetworks(network)

Arguments

network

Graph object

Value

Largest subnetwork from the input network list as an "igraph" object

Table of all Reactome pathways and genes

Description

Table of all Reactome pathways and genes

Usage

data(reactomeDatabase)
data(reactomeDatabase)

Format

A data frame (tibble) with 123574 rows and 3 columns

pathwayId: Reactome pathway ID
entrezGeneId: Entrez gene ID
pathwayName: Name of the Reactome pathway

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

See https://reactome.org/ for more information.

Table of all Sigora pathways and their constituent genes

Description

Table of all Sigora pathways and their constituent genes

Usage

data(sigoraDatabase)
data(sigoraDatabase)

Format

A data frame (tibble) with 60775 rows and 4 columns

pathwayId: Reactome pathway identifier
pathwayName: Reactome pathway description
ensemblGeneId: Ensembl gene identifier
hgncSymbol: HGNC gene symbol

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

Please refer to the Sigora package for more details: https://cran.r-project.org/package=sigora

Sigora enrichment example

Description

Example Sigora output from running pathwayEnrichment() on "exampleDESeqResults"

Usage

data(sigoraExamples)
data(sigoraExamples)

Format

A data frame (tibble) with 66 rows and 12 columns

comparison: Comparison from which results are derived; names of the input list
direction: Was the pathway enriched in up or down regulated genes
pathwayId: Reactome pathway identifier
pathwayName: Description of the pathway
pValue: Nominal p value for the enrichment
pValueAdjusted: p value adjusted for multiple testing
genes: Genes in the pathway/input
numCandidateGenes: Analyzed genes found in the pathway of interest
numBgGenes: All genes from the pathway database
geneRatio: Quotient of the number of candidate and background genes
totalGenes: Total number of input genes
topLevelPathway: Pathway category

Value

An object of class "tbl", "tbl.df", "data.frame"

Source

Please refer to the Sigora package for more details on that method: https://cran.r-project.org/package=sigora

Package 'pathlinkR'

Help Index

INTERNAL Create manual breaks/labels for volcano plots

Description

Usage

Arguments

Value

See Also

INTERNAL Construct heatmap legend

Description

Usage

Arguments

Value

See Also

INTERNAL Wrapper around Sigora's enrichment function

Description

Usage

Arguments

Value

References

See Also

INTERNAL Break long strings at spaces

Description

Usage

Arguments

Value

See Also

Create a volcano plot of RNA-Seq results

Description

Usage

Arguments

Details

Value

See Also

Examples

List of example results from DESeq2

Description

Usage

Format

Value

Source

Calculate pairwise distances from a table of pathways and genes

Description

Usage

Arguments

Value

References

See Also

Examples

Colour assignments for grouped pathways

Description

Usage

Format

Value

Table of Hallmark gene sets and their genes

Description

Usage

Format

Value

Source

InnateDB PPI data

Description

Usage

Format

Value

Source

Table of KEGG pathways and genes

Description

Usage

Format

Value

Source

Table of human gene ID mappings

Description

Usage

Format

Value

Source

Create a pathway network from enrichment results and a pathway interaction foundation

Description