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Comparative genomics approach toward critical determinants for the imprinting of an evolutionarily conserved gene Impact.

Abstract：

:The Impact is an evolutionarily conserved gene subjected to genomic imprinting in mouse but not in human. A characteristic tandem repeat similar to those found in many other imprinted genes and an elevated expression level, both observed only for the mouse gene, are implicated in the evolution of imprinting, to which the repeat might have contributed via enhancement of the expression. To pursue the possibility further, we examined the correlation among the repeat, expression level, and imprinting of Impact in various mammals ranging from rodents, lagomorphs, carnivores, artiodactyls to primates. Intriguingly, rabbit Impact is abundantly expressed and imprinted like those of rodents, but is missing the repeat from its first intron like those of other mammals that express both alleles weakly. It thus seems that lineage-specific enhancement of gene expression rather than the tandem repeat per se played a critical role in the evolution of imprinting of Impact.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Okamura K,Sakaki Y,Ito T

doi

10.1016/j.bbrc.2005.02.048

subject

Has Abstract

pub_date

2005-04-15 00:00:00

pages

824-30

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)00272-X

journal_volume

329

pub_type

杂志文章

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