Analysis of nucleosome positioning determined by DNA helix curvature in the human genome.

Abstract:

BACKGROUND:Nucleosome positioning has an important role in gene regulation. However, dynamic positioning in vivo casts doubt on the reliability of predictions based on DNA sequence characteristics. What role does sequence-dependent positioning play? In this paper, using a curvature profile model, nucleosomes are predicted in the human genome and patterns of nucleosomes near some key sites are investigated. RESULTS:Curvature profiling revealed that in the vicinity of a transcription start site, there is also a nucleosome-free region. Near transcription factor binding sites, curvature profiling showed a trough, indicating nucleosome depletion. The trough of the curvature profile corresponds well to the high binding scores of transcription factors. Moreover, our analysis suggests that nucleosome positioning has a selective protection role. Target sites of miRNAs are occupied by nucleosomes, while single nucleotide polymorphism sites are depleted of nucleosomes. CONCLUSIONS:The results indicate that DNA sequences play an important role in nucleosome positioning, and the positioning is important not only in gene regulation, but also in genetic variation and miRNA functions.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Liu H,Duan X,Yu S,Sun X

doi

10.1186/1471-2164-12-72

subject

Has Abstract

pub_date

2011-01-27 00:00:00

pages

72

issn

1471-2164

pii

1471-2164-12-72

journal_volume

12

pub_type

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