A 210-kb segment of tandem repeats and retroelements located between imprinted subdomains of mouse distal chromosome 7

Hisao Shirohzu, Takaaki Yokomine, Chiyoko Sato, Reiko Kato, Atsushi Toyoda, Wahyu Purbowasito, Chikako Suda, Tsunehiro Mukai, Masahira Hattori, Katsuzumi Okumura, Yoshiyuki Sakaki, Hiroyuki Sasaki

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Mammalian genes subject to genomic imprinting often form clusters and are regulated by long-range mechanisms. The distal imprinted domain of mouse chromosome 7 is orthologous to the Beckwith-Wiedemann syndrome domain in human chromosome 11p15.5 and contains at least 13 imprinted genes. This domain consists of two subdomains, which are respectively regulated by an imprinting center. We here report the finished-quality sequence of a 0.6-Mb region encompassing the more centromeric subdomain. The sequence contains four imprinted genes (Ascl2/Mash2, Ins2, Igf2 and H19) and reveals previously unidentified CpG islands and tandem repeats, which may be features of imprinted genes. Most interestingly, a unique 210-kb segment consisting almost exclusively of tandem repeats and retroelements is identified. This segment, located between Th and Ins2, has features of heterochromatin-forming DNA and is highly methylated at CpG sites. The segment exhibits asynchronous replication on the parental chromosomes, a feature of the imprinted domains. We propose that this repeat segment could serve either as a boundary between the two subdomains or as a target for epigenetic chromatin modifications that regulate imprinting.

Original languageEnglish
Pages (from-to)325-334
Number of pages10
JournalDNA Research
Volume11
Issue number5
DOIs
Publication statusPublished - 2004
Externally publishedYes

Keywords

  • DNA methylation
  • Genomic imprinting
  • Replication timing
  • Retroelement
  • Tandem repeat

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology

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    Shirohzu, H., Yokomine, T., Sato, C., Kato, R., Toyoda, A., Purbowasito, W., Suda, C., Mukai, T., Hattori, M., Okumura, K., Sakaki, Y., & Sasaki, H. (2004). A 210-kb segment of tandem repeats and retroelements located between imprinted subdomains of mouse distal chromosome 7. DNA Research, 11(5), 325-334. https://doi.org/10.1093/dnares/11.5.325