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Extreme heterogeneity of Ty1-copia group retrotransposons in plants 总被引:18,自引:0,他引:18
Andrew J. Flavell Donald B. Smith Amar Kumar 《Molecular & general genetics : MGG》1992,231(2):233-242
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A. J. Flavell 《Genetica》1992,86(1-3):203-214
Ty1-copia group retrotransposons are among the best studied transposable elements in the eukaryotes. This review discusses the extent of these transposons in the eukaryote kingdoms and compares models for the evolution of these genetic elements in the light of recent phylogenetic data. These data show that the Ty1-copia group is widespread among invertebrate eukaryotes, especially in the higher plant kingdom, where these genetic elements are unusually common and heterogeneous in their sequence. The phylogenetic data also suggest that the present day spectrum of Ty1-copia group retrotransposons has been influenced both by divergence during vertical transmission down evolving lineages and by horizontal transmission between distantly related species. Lastly, the factors affecting Ty1-copia group retrotransposon copy number and sequence heterogeneity in eukaryotic genomes and the effects of transpositional quiescence and defective retrotransposons upon evolution of Ty1-copia group retrotransposons are discussed. 相似文献
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本研究根据Ty1-copia类反转录转座子反转录酶的保守区设计简并引物,通过PCR扩增,从裸燕麦(Avena nuda L.)品种‘品燕1号’基因组中分离获得23条Ty1-copia类反转录转座子序列,并对序列特征、系统发育关系及其转录活性进行分析。结果显示,23条Ty1-copia类反转录转座子存在较高的异质性,序列间的一致性为45%~98%,存在插入、移码和终止密码突变,但频率不高;系统发育分析结果表明,燕麦Ty1-copia类反转录转座子在进化过程中主要为垂直传递。本研究通过检索燕麦基因表达数据库,发现了5个有转录活性的Ty1-copia类反转录转座子。 相似文献
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The evolution of Ty1-copia group retrotransposons in gymnosperms 总被引:1,自引:0,他引:1
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Summary We have used the polymerase chain reaction (PCR) to isolate a sequence characteristic of aTy1-copia group retrotransposon from the genome of the herring (Clupea harengus). This is the firstTy1-copia group retrotransposon sequence described in a vertebrate. Phylogenetic comparison of this sequence with other members of this group of retrotransposons shows that it resembles more closely some Tyl-copia group members fromDrosophila melanogaster than other group members in plants and fungi. These observations provide further evidence that theTy1-copia group LTR retrotransposons span many of the major eukaryote species boundaries, suggesting that horizontal transmission between different species has played a role in the evolution of this retrotransposon group. 相似文献
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The chromosomal distributions of Ty1-copia group retrotransposable elements in higher plants and their implications for genome evolution 总被引:3,自引:0,他引:3
J.S. Heslop-Harrison Andrea Brandes Shin Taketa Thomas Schmidt Alexander V. Vershinin Elena G. Alkhimova Anette Kamm Robert L. Doudrick Trude Schwarzacher Andreas Katsiotis Sybille Kubis Amar Kumar Steven R. Pearce Andrew J. Flavell Gill E. Harrison 《Genetica》1997,100(1-3):197-204