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缬氨酰 - tRNA合成酶系统发育揭示贾第虫和阴道毛滴虫中线粒体的继发性缺失

Secondary absence of mitochondria in Giardia lamblia and Trichomonas vaginalis revealed by valyl-tRNA synthetase phylogeny.

作者信息

Hashimoto T, Sánchez L B, Shirakura T, Müller M, Hasegawa M

机构信息

The Institute of Statistical Mathematics, 4-6-7 Minami-Azabu, Minato-ku, Tokyo 106, Japan.

出版信息

Proc Natl Acad Sci U S A. 1998 Jun 9;95(12):6860-5. doi: 10.1073/pnas.95.12.6860.

Abstract

Nuclear-coded valyl-tRNA synthetase (ValRS) of eukaryotes is regarded of mitochondrial origin. Complete ValRS sequences obtained by us from two amitochondriate protists, the diplomonad, Giardia lamblia and the parabasalid, Trichomonas vaginalis were of the eukaryotic type, strongly suggesting an identical history of ValRS in all eukaryotes studied so far. The findings indicate that diplomonads are secondarily amitochondriate and give further evidence for such conclusion reached recently concerning parabasalids. Together with similar findings on other amitochondriate groups (microsporidia and entamoebids), this work provides critical support for the emerging notion that no representatives of the premitochondrial stage of eukaryotic phylogenesis exist among the species living today.

摘要

真核生物的核编码缬氨酰 - tRNA合成酶(ValRS)被认为起源于线粒体。我们从两种无线粒体的原生生物——双滴虫贾第虫和副基体阴道毛滴虫中获得的完整ValRS序列属于真核类型,这强烈表明到目前为止在所有研究的真核生物中ValRS具有相同的演化历史。这些发现表明双滴虫是次生无线粒体的,并为最近关于副基体的这一结论提供了进一步的证据。连同在其他无线粒体类群(微孢子虫和内阿米巴)上的类似发现,这项工作为一个新出现的观点提供了关键支持,即现存物种中不存在真核生物系统发生线粒体前期阶段的代表。

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本文引用的文献

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What are the microsporidia?微孢子虫是什么?
Parasitol Today. 1997 Dec;13(12):455-6. doi: 10.1016/s0169-4758(97)01123-x.
2
Evolutionary origins of trichomonad hydrogenosomes.毛滴虫氢化酶体的进化起源。
Parasitol Today. 1997 May;13(5):166-7. doi: 10.1016/s0169-4758(97)01036-3.
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A phylogenetic analysis of Aquifex pyrophilus.嗜热栖热菌的系统发育分析。
Syst Appl Microbiol. 1992 Aug;15(3):352-6. doi: 10.1016/S0723-2020(11)80207-9.
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Archaea and the prokaryote-to-eukaryote transition.古生菌与原核生物向真核生物的转变
Microbiol Mol Biol Rev. 1997 Dec;61(4):456-502. doi: 10.1128/mmbr.61.4.456-502.1997.
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Evolution of the hydrogenosome.氢化酶体的进化
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