Molecular cloning of doublesex genes of four cladocera (water flea) species

Kenji Toyota, Yasuhiko Kato, Masaru Sato, Naomi Sugiura, Shinichi Miyagawa, Hitoshi Miyakawa, Hajime Watanabe, Shigeto Oda, Yukiko Ogino, Chizue Hiruta, Takeshi Mizutani, Norihisa Tatarazako, Susanne Paland, Craig Jackson, John K. Colbourne, Taisen Iguchi

研究成果: Contribution to journalArticle査読

38 被引用数 (Scopus)

抄録

Background: The gene doublesex (dsx) is known as a key factor regulating genetic sex determination in many organisms. We previously identified two dsx genes (DapmaDsx1 and DapmaDsx2) from a freshwater branchiopod crustacean, Daphnia magna, which are expressed in males but not in females. D. magna produces males by parthenogenesis in response to environmental cues (environmental sex determination) and we showed that DapmaDsx1 expression during embryonic stages is responsible for the male trait development. The D. magna dsx genes are thought to have arisen by a cladoceran-specific duplication; therefore, to investigate evolutionary conservation of sex specific expression of dsx genes and to further assess their functions in the environmental sex determination, we searched for dsx homologs in four closely related cladoceran species.Results: We identified homologs of both dsx genes from, D. pulex, D. galeata, and Ceriodaphnia dubia, yet only a single dsx gene was found from Moina macrocopa. The deduced amino acid sequences of all 9 dsx homologs contained the DM and oligomerization domains, which are characteristic for all arthropod DSX family members. Molecular phylogenetic analysis suggested that the dsx gene duplication likely occurred prior to the divergence of these cladoceran species, because that of the giant tiger prawn Penaeus monodon is rooted ancestrally to both DSX1 and DSX2 of cladocerans. Therefore, this result also suggested that M. macrocopa lost dsx2 gene secondarily. Furthermore, all dsx genes identified in this study showed male-biased expression levels, yet only half of the putative 5' upstream regulatory elements are preserved in D. magna and D. pulex.Conclusions: The all dsx genes of five cladoceran species examined had similar amino acid structure containing highly conserved DM and oligomerization domains, and exhibited sexually dimorphic expression patterns, suggesting that these genes may have similar functions for environmental sex determination in cladocerans.

本文言語英語
論文番号239
ジャーナルBMC genomics
14
1
DOI
出版ステータス出版済み - 4 10 2013
外部発表はい

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 遺伝学

フィンガープリント

「Molecular cloning of doublesex genes of four cladocera (water flea) species」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル