Novel non-autonomous transposable elements on W chromosome of the silkworm, Bombyx mori

Hiroaki Abe, Tsuguru Fujii, Toru Shimada, Kazuei Mita

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The sex chromosomes of the silkworm Bombyx mori are designated ZW(XY) for females and ZZ (XX) for males. Numerous long terminal repeat (LTR) and non-LTR retrotransposons, retroposons and DNA transposons have accumulated as strata on the W chromosome. However, there are nucleotide sequences that do not show the characteristics of typical transposable elements on the W chromosome. To analyse these uncharacterized nucleotide sequences on the W chromosome, we used whole-genome shotgun (WGS) data and assembled data that was obtained using male genome DNA. Through these analyses, we found that almost all of these uncharacterized sequences were non-autonomous transposable elements that do not fit into the conventional classification. It is notable that some of these transposable elements contained the Bombyx short interspersed element (Bm1) sequences in the elements. We designated them as secondary-Bm1 transposable elements (SBTEs). Because putative ancestral SBTE nucleotide sequences without Bm1 do not occur in theWGS data, we suggest that the Bm1 sequences of SBTEs are not carried on each element merely as a package but are components of each element. Therefore, we confirmed that SBTEs should be classified as a new group of transposable elements.

Original languageEnglish
Pages (from-to)375-387
Number of pages13
JournalJournal of Genetics
Volume89
Issue number3
DOIs
Publication statusPublished - Sep 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Genetics

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