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Updated: Aug 19, 2026

Genome-wide Analysis using ChIP to Identify Isoform-specific Gene Targets
Published on: July 7, 2010
CisOrtho: a program pipeline for genome-wide identification of transcription factor target genes using phylogenetic
Henry R Bigelow1, Adam S Wenick, Allan Wong
1Department of Biochemistry and Molecular Biophysics, Columbia University, College of Physicians and Surgeons, 701 West 168th Street, New York, NY 10032, USA. hrb46@columbia.edu
Background:
All known genomes code for a large number of transcription factors. It is important to develop methods that will reveal how these transcription factors act on a genome wide level, that is, through what target genes they exert their function.
Results:
We describe here a program pipeline aimed at identifying transcription factor target genes in whole genomes. Starting from a consensus binding site, represented as a weight matrix, potential sites in a pre-filtered genome are identified and then further filtered by assessing conservation of the putative site in the genome of a related species, a process called phylogenetic footprinting. CisOrtho has been successfully used to identify targets for two homeodomain transcription factors in the genomes of the nematodes Caenorhabditis elegans and Caenorhabditis briggsae.
Conclusions:
CisOrtho will identify targets of other nematode transcription factors whose DNA binding specificity is known and can be easily adapted to search other genomes for transcription factor targets.
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