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

被引:122
作者
Hashimoto, T
Sanchez, LB
Shirakura, T
Müller, M
Hasegawa, M
机构
[1] Inst Stat Math, Minato Ku, Tokyo 106, Japan
[2] Rockefeller Univ, New York, NY 10021 USA
关键词
amitochondriate protists; diplomonads; parabasalia;
D O I
10.1073/pnas.95.12.6860
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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 phytogenesis exist among the species living today.
引用
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页码:6860 / 6865
页数:6
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