Distribution of DNA methylation, CpGs, and CpG islands in human isochores.

Abstract:

:DNA methylation is a major epigenetic modification of the genome that affects basic biological functions, such as gene expression and cell development. We used the human genome sequences and the DNA methylation data that are available in order to establish a map of the levels of GC and methylation in isochores. We also looked for the correlations that hold between GC levels and the distribution of the (1) dinucleotide CpG, (2) ratio 5mC/CpG, and (3) CpG islands. Our results show that methylation levels, CpG frequencies, and the density of CpG islands are positively correlated with the GC level of isochores. In contrast, the correlation between the 5mC/CpG ratio and GC is a negative one because the increase in methylation lags behind that of CpG, to reach a plateau in the GC-richest, gene-richest isochore families H2 and H3. In conclusion, there are more CpG targets that remain unmethylated in the GC-richest, gene-richest isochores in comparison with the other isochores. This conclusion supports the idea that the widespread methylation under consideration here has a general inhibitory effect on gene expression.

journal_name

Genomics

journal_title

Genomics

authors

Varriale A,Bernardi G

doi

10.1016/j.ygeno.2009.09.006

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

25-8

issue

1

eissn

0888-7543

issn

1089-8646

pii

S0888-7543(09)00216-X

journal_volume

95

pub_type

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