Evolution of the vertebrate DNMT3 gene family: a possible link between existence of DNMT3L and genomic imprinting

Autor:	Hiroyuki Sasaki, Takaaki Yokomine, Kenichiro Hata, Masaoki Tsudzuki
Rok vydání:	2006
Předmět:	Genetics endocrine system biology urogenital system Fugu biology.organism_classification Conserved sequence embryonic structures DNA methylation Gene family Imprinting (psychology) Genomic imprinting Molecular Biology Gene Zebrafish Genetics (clinical)
Zdroj:	Cytogenetic and Genome Research. 113:75-80
ISSN:	1424-859X 1424-8581
Popis:	DNA methylation plays an essential role in genomic imprinting observed in eutherian mammals and marsupials. In mouse, one of the two de novo DNA methyltransferases, Dnmt3a, and a related protein, Dnmt3L have been shown to be essential for imprint establishment in the parental germline. To gain insights into the evolution of imprinting mechanisms, we have identified and characterized the DNMT3 family genes in other vertebrate species. We cloned cDNAs for chicken DNMT3A and DNMT3B, whose putative protein products shared 81.5% and 48.6% amino acid sequence identity with their mouse orthologues. Using computer-assisted database searches, we also identified DNMT3A and DNMT3B orthologues in fish (fugu and zebrafish) and marsupials (opossum). We found that, while opossums had an orthologue for DNMT3L, chickens and fish did not have this gene. Thus, unlike the other DNMT3 members, DNMT3L was restricted to the species in which imprinting occurs. The acquisition of DNMT3L by a common ancestor of eutherians and marsupials might have been closely related to the evolution of imprinting.
Databáze:	OpenAIRE
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