Package 'Qtlizer'

Title: Comprehensive QTL annotation of GWAS results
Description: This R package provides access to the Qtlizer web server. Qtlizer annotates lists of common small variants (mainly SNPs) and genes in humans with associated changes in gene expression using the most comprehensive database of published quantitative trait loci (QTLs).
Authors: Matthias Munz [aut, cre] , Julia Remes [aut]
Maintainer: Matthias Munz <[email protected]>
License: GPL-3
Version: 1.19.0
Built: 2024-06-30 03:56:31 UTC
Source: https://github.com/bioc/Qtlizer

Help Index


Query Qtlizer

Description

Query Qtlizer database for expression quantitative trait loci (eQTLs) in human.

Usage

get_qtls(query, corr = NA, max_terms = 5, ld_method = "r2",
  ref_version = "hg19", return_obj = "dataframe")

Arguments

query

The query consists of search terms and can be a single string or a vector. Qtlizer allows to query both variants (Rsid, ref_version:chr:pos) and genes (Symbol consisting of letters and numbers according to the HGNC guidelines). Minimum allowed term length is 2.

corr

Linkage disequilibrium based on 1000 Genomes Phase 3 European. If this optional value between 0 and 1 is set, the input variants are enriched for proxy variants passing the threshold. Default value is NA.

max_terms

Number of terms in a single HTTP request. Default value is 5. A large value can lead to a very large result set and a error by the database.

ld_method

There are two methods available: "r2" (default) and "dprime".

ref_version

Two possible versions are supported: hg19 (GRCh37) or hg38 (GRCh38). Default value is "hg19". This argument is only considered if a GenomicRanges::GRanges object is returned.

return_obj

The user can choose to get the QTL data to be returned as data frame or as a GenomicRanges::GRanges object. The default value is "dataframe".

Value

Data frame or GenomicRanges::GRanges object containing QTL data.

Examples

get_qtls("rs4284742")
get_qtls(c("rs4284742", "DEFA1"))
get_qtls("rs4284742,DEFA1")
get_qtls("rs4284742", return_obj="granges", ref_version="hg38")
get_qtls("rs4284742", corr=0.6)