Genome-scale identification of Caenorhabditis elegans regulatory elements by tiling-array mapping of DNase I hypersensitive sites.

Abstract:

BACKGROUND:A major goal of post-genomics research is the integrated analysis of genes, regulatory elements and the chromatin architecture on a genome-wide scale. Mapping DNase I hypersensitive sites within the nuclear chromatin is a powerful and well-established method of identifying regulatory element candidates. RESULTS:Here, we report the first genome-wide analysis of DNase I hypersensitive sites (DHSs) in Caenorhabditis elegans. The data was obtained by hybridizing DNase I-treated and end-captured material from young adult worms to a high-resolution tiling microarray. The data show that C. elegans DHSs were significantly enriched within intergenic regions located 2 kb upstream and downstream of coding genes, and also that a considerable fraction of all DHSs mapped to intergenic positions distant to annotated coding genes. Annotated transcribed loci were generally depleted in DHSs relative to intergenic regions, but DHSs were nonetheless enriched in coding exons and UTRs, whereas introns were significantly depleted in DHSs. Many DHSs appeared to be associated with annotated non-coding RNAs and recently detected transcripts of unknown function. It has been reported that nematode highly conserved non-coding elements were associated with cis-regulatory elements, and we also found that DHSs, particularly distal intergenic DHSs, were significantly enriched in regions that were conserved between the C. elegans and C. briggsae genomes. CONCLUSION:We describe the first genome-wide analysis of C. elegans DHSs, and show that the distribution of DHSs is strongly associated with functional elements in the genome.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Shi B,Guo X,Wu T,Sheng S,Wang J,Skogerbø G,Zhu X,Chen R

doi

10.1186/1471-2164-10-92

subject

Has Abstract

pub_date

2009-02-25 00:00:00

pages

92

issn

1471-2164

pii

1471-2164-10-92

journal_volume

10

pub_type

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