Registration Open for Bioc2024 July 24-26


This is the development version of geneXtendeR; for the stable release version, see geneXtendeR.

Optimized Functional Annotation Of ChIP-seq Data

Bioconductor version: Development (3.20)

geneXtendeR optimizes the functional annotation of ChIP-seq peaks by exploring relative differences in annotating ChIP-seq peak sets to variable-length gene bodies. In contrast to prior techniques, geneXtendeR considers peak annotations beyond just the closest gene, allowing users to see peak summary statistics for the first-closest gene, second-closest gene, ..., n-closest gene whilst ranking the output according to biologically relevant events and iteratively comparing the fidelity of peak-to-gene overlap across a user-defined range of upstream and downstream extensions on the original boundaries of each gene's coordinates. Since different ChIP-seq peak callers produce different differentially enriched peaks with a large variance in peak length distribution and total peak count, annotating peak lists with their nearest genes can often be a noisy process. As such, the goal of geneXtendeR is to robustly link differentially enriched peaks with their respective genes, thereby aiding experimental follow-up and validation in designing primers for a set of prospective gene candidates during qPCR.

Author: Bohdan Khomtchouk [aut, cre], William Koehler [aut]

Maintainer: Bohdan Khomtchouk <khomtchoukmed at>

Citation (from within R, enter citation("geneXtendeR")):


To install this package, start R (version "4.4") and enter:

if (!require("BiocManager", quietly = TRUE))

# The following initializes usage of Bioc devel


For older versions of R, please refer to the appropriate Bioconductor release.


To view documentation for the version of this package installed in your system, start R and enter:

geneXtendeR.pdf PDF
Reference Manual PDF


biocViews Annotation, ChIPSeq, ChipOnChip, Coverage, DataImport, DifferentialPeakCalling, GO, Genetics, GenomeAnnotation, HistoneModification, NaturalLanguageProcessing, PeakDetection, Software, Visualization
Version 1.31.0
In Bioconductor since BioC 3.4 (R-3.3) (7.5 years)
License GPL (>= 3)
Depends rtracklayer, GO.db, R (>= 3.5.0)
Imports data.table, dplyr, graphics, networkD3, RColorBrewer, SnowballC, tm, utils, wordcloud, AnnotationDbi, BiocStyle,
System Requirements
Bug Reports
See More
Suggests knitr, rmarkdown, testthat,,,,,,,,,,, org.Sc.sgd.db,,, rtracklayer
Linking To
Depends On Me
Imports Me
Suggests Me
Links To Me
Build Report Build Report

Package Archives

Follow Installation instructions to use this package in your R session.

Source Package geneXtendeR_1.31.0.tar.gz
Windows Binary (64-bit only)
macOS Binary (x86_64) geneXtendeR_1.31.0.tgz
macOS Binary (arm64) geneXtendeR_1.31.0.tgz
Source Repository git clone
Source Repository (Developer Access) git clone
Bioc Package Browser
Package Short Url
Package Downloads Report Download Stats