DNA methylation profiling in X;autosome translocations supports a role for L1 repeats in the spread of X chromosome inactivation.

Abstract:

:X chromosome inactivation (XCI) is an epigenetic mechanism that silences the majority of genes on one X chromosome in females. Previous studies have suggested that the spread of XCI might be facilitated in part by common repeats such as long interspersed nuclear elements (LINEs). However, owing to the unusual sequence content of the X and the nonrandom distribution of genes that escape XCI, it has been unclear whether the correlation between repeat elements and XCI is a functional one. To test the hypothesis that the spread of XCI shows sequence specificity, we have analyzed the pattern of XCI in autosomal chromatin by performing DNA methylation profiling in six unbalanced X;autosome translocations. Using promoter hypermethylation as an epigenetic signature of XCI, we have determined the inactivation status of 1050 autosomal genes after translocation onto an inactive derivative X. By performing a comparative sequence analysis of autosomal genes that are either subject to or escape the X inactivation signal, we identified a number of common repetitive elements, including L1 and L2 LINEs, and DNA motifs that are significantly enriched around inactive autosomal genes. We show that these same motifs predominantly map to L1P repeat elements, are significantly enriched on the X chromosome versus the autosomes and also occur at higher densities around X-linked genes that are subject to X inactivation compared with those that escape X inactivation. These results are consistent with a potential causal relationship between DNA sequence features such as L1s and the spread of XCI, lending strong support to Mary Lyon's 'repeat hypothesis'.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Bala Tannan N,Brahmachary M,Garg P,Borel C,Alnefaie R,Watson CT,Thomas NS,Sharp AJ

doi

10.1093/hmg/ddt553

subject

Has Abstract

pub_date

2014-03-01 00:00:00

pages

1224-36

issue

5

eissn

0964-6906

issn

1460-2083

pii

ddt553

journal_volume

23

pub_type

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