Genomic organization and promoter analysis of the Dnmt3b gene

Chisaki Ishida, Kiyoe Ura, Akiko Hirao, Hiroyuki Sasaki, Atsushi Toyoda, Yoshiyuki Sakaki, Hitoshi Niwa, En Li, Yasufumi Kaneda

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


The Dnmt3b gene encodes a de novo DNA methyltransferase that is essential for normal mouse development. It is highly expressed in early embryos and embryonic stem (ES) cells but downregulated in most adult somatic tissues. To gain insight into the regulation of Dnmt3b, we have isolated a mouse genomic bacterial artificial chromosome clone that contains the Dnmt3b gene. Complete sequence analysis of the clone demonstrated that Dnmt3b consists of at least 24 exons and spans 38 kilobases. S1 nuclease analysis identified two adjacent transcriptional start sites located downstream of a unique TATA-like element in a CpG island. There was an unknown gene which we named mU3 17 kb upstream of the Dnmt3b locus, and it was transcribed ubiquitously and in the opposite direction of Dnmt3b. Transfection analysis revealed that the minimal promoter region containing an Sp1 site was active even in somatic cells, and that there were several repressor elements within 7.9 kb upstream of Dnmt3b downregulated this gene specifically in somatic cells but not in ES cells. These findings provide a basis for future detailed studies of the mechanisms controlling Dnmt3b expression.

Original languageEnglish
Pages (from-to)151-159
Number of pages9
Issue number1-2
Publication statusPublished - May 22 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Genetics


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