CexoR-package {CexoR} | R Documentation

## An R package to uncover high-resolution protein-DNA interactions in ChIP-exo replicates

### Description

Strand specific peak-pair calling in ChIP-exo replicates. The cumulative Skellam distribution function (package 'skellam') is used to detect significant normalised count differences of opposed sign at each DNA strand (peak-pairs). Irreproducible discovery rate for overlapping peak-pairs across biological replicates is estimated using the package 'idr'.

### Details

Package: | CexoR
Type: | Package
Version: | 1.7.4
Date: | 2015-07-09
License: | Artistic-2.0 | GPL-2 + file LICENSE
LazyLoad: | yes

### Author(s)

Pedro Madrigal,

Maintainer: Pedro Madrigal dnaseiseq@gmail.com

### References

Madrigal P (2015) CexoR: an R/Bioconductor package to uncover high-resolution protein-DNA interactions in ChIP-exo replicates. EMBnet.journal 21: e837.
Skellam JG (1946) The frequency distribution of the difference between two Poisson variates belonging to different populations. J R Stat Soc Ser A 109: 296.
Li Q, Brown J, Huang H, Bickel P (2011) Measuring reproducibility of high-throughput experiments. Ann Appl Stat 5: 1752-1779.
Rhee HS, Pugh BF (2011) Comprehensive genome-wide protein-DNA interactions detected at single-nucleotide resolution. Cell 147: 1408-1419.

### Examples

    ## hg19. chr2:1-1,000,000. CTCF data from Rhee and Pugh (2011)

    owd <- setwd(tempdir())

    rep1 <- "CTCF_rep1_chr2_1-1e6.bam"
    rep2 <- "CTCF_rep2_chr2_1-1e6.bam"
    rep3 <- "CTCF_rep3_chr2_1-1e6.bam"
    r1 <- system.file("extdata", rep1, package="CexoR",mustWork = TRUE)
    r2 <- system.file("extdata", rep2, package="CexoR",mustWork = TRUE)
    r3 <- system.file("extdata", rep3, package="CexoR",mustWork = TRUE)

    chipexo <- cexor(bam=c(r1,r2,r3), chrN="chr2", chrL=1e6, idr=0.01, p=1e-12, N=3e4)

    plotcexor(bam=c(r1,r2,r3), peaks=chipexo, EXT=500)

    setwd(owd)

[Package CexoR version 1.18.0 Index]