title: Identification and characterization of cell type-specific and ubiquitous chromatin regulatory structures in the human genome.
abstract: The identification of regulatory elements from different cell types is necessary for understanding the mechanisms controlling cell type-specific and housekeeping gene expression. Mapping DNaseI hypersensitive (HS) sites is an accurate method for identifying the location of functional regulatory elements. We used a high throughput method called DNase-chip to identify 3,904 DNaseI HS sites from six cell types across 1% of the human genome. A significant number (22%) of DNaseI HS sites from each cell type are ubiquitously present among all cell types studied. Surprisingly, nearly all of these ubiquitous DNaseI HS sites correspond to either promoters or insulator elements: 86% of them are located near annotated transcription start sites and 10% are bound by CTCF, a protein with known enhancer-blocking insulator activity. We also identified a large number of DNaseI HS sites that are cell type specific (only present in one cell type); these regions are enriched for enhancer elements and correlate with cell type-specific gene expression as well as cell type-specific histone modifications. Finally, we found that approximately 8% of the genome overlaps a DNaseI HS site in at least one the six cell lines studied, indicating that a significant percentage of the genome is potentially functional.
authors: Bioinformatics Program, Boston University, Boston, Massachusetts, United States of America.
authors: Hualin
authors: H
authors: Xi
authors: Hennady P
authors: HP
authors: Shulha
authors: Jane M
authors: JM
authors: Lin
authors: Teresa R
authors: TR
authors: Vales
authors: Yutao
authors: Y
authors: Fu
authors: David M
authors: DM
authors: Bodine
authors: Ronald D G
authors: RD
authors: McKay
authors: Josh G
authors: JG
authors: Chenoweth
authors: Paul J
authors: PJ
authors: Tesar
authors: Terrence S
authors: TS
authors: Furey
authors: Bing
authors: B
authors: Ren
authors: Zhiping
authors: Z
authors: Weng
authors: Gregory E
authors: GE
authors: Crawford
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D000076246:CCCTC-Binding Factor; D019070:Cell Lineage / Q000235:genetics; D002478:Cells, Cultured; D002843:Chromatin / Q000737:chemistry*; D002874:Chromosome Mapping; D016000:Cluster Analysis; D018899:CpG Islands / Q000235:genetics; D004268:DNA-Binding Proteins / Q000378:metabolism; D003850:Deoxyribonuclease I / Q000378:metabolism; D015894:Genome, Human; D006367:HeLa Cells; D006801:Humans; D038101:Insulator Elements / Q000235:genetics; D020014:K562 Cells; D046228:Microarray Analysis; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000235:genetics*; D050436:Regulatory Elements, Transcriptional; D012097:Repressor Proteins / Q000378:metabolism; D012107:Research Design; D017422:Sequence Analysis, DNA / Q000379:methods
chemical_list: D000076246:CCCTC-Binding Factor; C000619697:CTCF protein, human; D002843:Chromatin; D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D003850:Deoxyribonuclease I
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