Identification of tammar wallaby SIRH12, derived from a marsupial-specific retrotransposition event.

Identification of tammar wallaby SIRH12, derived from a marsupial-specific retrotransposition event.
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DOI:
10.1093/dnares/dsr012
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发表时间:
2011-08
期刊:
DNA research : an international journal for rapid publication of reports on genes and genomes
影响因子:
--
通讯作者:
Ishino F
Ishino F
中科院分区:
其他
文献类型:
--
作者:
Ono R;Kuroki Y;Naruse M;Ishii M;Iwasaki S;Toyoda A;Fujiyama A;Shaw G;Renfree MB;Kaneko-Ishino T;Ishino F

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在人类和小鼠中,有11个基因来自寿司相关的反转录转座子,其中一些已知在胎盘发育中发挥重要作用。有趣的是,这个反转录转座子家族被认为只存在于真兽类动物中,这表明它们对真兽类的进化做出了重大贡献,但至少有一个反转座子家族PEG10在有袋类和真兽类之间保守。在这里,我们报告了一个新的寿司-ichi反转录转座子衍生基因,SIRH12,在袋鼠科澳大利亚有袋动物物种Tammar Walllaby中。SIRH12编码的蛋白质与袋鼠中的寿司反转录转座子Gag蛋白高度同源,而南美短尾灰负鼠中的SIRH12是一个假基因,通过多个无义突变的积累而退化。这表明,SIRH12逆转录转位只发生在有袋类的谱系中,但获得并保留了一些尚未确定的新功能,至少在袋鼠的谱系中是这样。
In humans and mice, there are 11 genes derived from sushi-ichi related retrotransposons, some of which are known to play essential roles in placental development. Interestingly, this family of retrotransposons was thought to exist only in eutherian mammals, indicating their significant contributions to the eutherian evolution, but at least one, PEG10, is conserved between marsupials and eutherians. Here we report a novel sushi-ichi retrotransposon-derived gene, SIRH12, in the tammar wallaby, an Australian marsupial species of the kangaroo family. SIRH12 encodes a protein highly homologous to the sushi-ichi retrotransposon Gag protein in the tammar wallaby, while SIRH12 in the South American short-tailed grey opossum is a pseudogene degenerated by accumulation of multiple nonsense mutations. This suggests that SIRH12 retrotransposition occurred only in the marsupial lineage but acquired and retained some as yet unidentified novel function, at least in the lineage of the tammar wallaby.
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