DIFFERENT FATES OF THE CHLOROPLAST TUFA GENE FOLLOWING ITS TRANSFER TO THE NUCLEUS IN GREEN-ALGAE

被引:95
作者
BALDAUF, SL [1 ]
MANHART, JR [1 ]
PALMER, JD [1 ]
机构
[1] TEXAS A&M UNIV SYST,DEPT BIOL,COLLEGE STN,TX 77843
关键词
Elongation factor Tu; Gene duplication; Gene transfer; Multigene family; Organelle genomes;
D O I
10.1073/pnas.87.14.5317
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
Previous work suggested that the tufA gene, encoding protein synthesis elongation factor Tu, was transferred from the chloroplast to the nucleus within the green algal lineage giving rise to land plants. In this report we investigate the timing and mode of transfer by examining chloroplast and nuclear DNA from the three major classes of green algae, with emphasis on the class Charophyceae, the proposed sister group to land plants. Filter hybridizations reveal a chloroplast tufA gene in all Ulvophyceae and Chlorophyceae and in some but not all Charophyceae. One charophycean alga, Coleochaete orbicularis, is shown to contain an intact but highly divergent chloroplast tufA gene, whose product is predicted to be nonfunctional in protein synthesis. We propose that a copy of the tufA gene was functionally transferred from the chloroplast to the nucleus early in the evolution of the Charophyceae, with chloroplast copies of varying function being retained in some but not all of the subsequently diverging lineages. This proposal is supported by the demonstration of multiple tufA-like sequences in Coleochaete nuclear DNA and in nuclear DNA from all other Charophyceae examined.
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页码:5317 / 5321
页数:5
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