Imprinted control regions include composite DNA elements consisting of the ZFP57 binding site overlapping MLL1 morphemes.

Abstract:

:Mammalian genomes include DNA segments that are imprinted (CpG-methylated) only on one of the two parental chromosomes, leading to parent-of-origin-specific gene expression. The process is regulated by Imprinting Control Regions (ICRs) and germline Differentially Methylated Regions (gDMRs). Previously, ZFP57 was shown to recognize a methylated hexanucleotide in ICRs to maintain allele-specific gene repression. In Bioinformatics analyses, I found that the hexamer occurred frequently in mouse chromosomal DNA, suggesting that beside the ZFP57 binding site (ZFBS), ICRs contained sequence features with unknown characteristics. To identify such features, I examined chromosomal abundance of motifs in which the length of the hexamer was extended by one or several nucleotides. Results led to the discovery of a group of functionally significant composite DNA elements (ZFBS-Morph overlaps) that may play dual roles in the regulation of allele-specific gene expression. Importantly, results of genome-wide evaluations revealed that nearly 90% of the gDMRs included closely-spaced ZFBS-Morph overlaps.

journal_name

Genomics

journal_title

Genomics

authors

Bina M

doi

10.1016/j.ygeno.2017.04.008

subject

Has Abstract

pub_date

2017-07-01 00:00:00

pages

265-273

issue

3-4

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(17)30031-9

journal_volume

109

pub_type

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