The Evolution of Ty1-copia Group Retrotransposons in Gymnosperms
نویسندگان
چکیده
منابع مشابه
Ty1-copia group retrotransposons and the evolution of retroelements in several angiosperm plants: evidence of horizontal transmission
The phylogenetic relationships among thirty-seven new Ty1-copia group retrotransposons in seven angiosperm plants were examined by reverse transcriptase and ribonuclease H sequence analysis. Distribution pattern of the retrotransposons of closely related plant species generally reflects a close phylogenetic relationship. In contrast, we found that several retrotransposon sequences from the same...
متن کاملSequence evolution and copy number of Ty1-copia retrotransposons in diverse plant genomes.
Sequence evolution of the reverse transcriptase (RT) gene in retrotransposons belonging to the Ty1-copia class was studied in 11 plant species. Phylogenetic reconstruction of the evolutionary history of RT sequences indicated a strong pattern of purifying selection, manifested as high ratios of third to first plus second codon position substitutions, and low ratios of nonsynonymous substitution...
متن کاملTy1-copia group retrotransposons are ubiquitous and heterogeneous in higher plants.
We have used the polymerase chain reaction to isolate fragments of Ty1-copia group retrotransposons from a wide variety of members of the higher plant kingdom. 56 out of 57 species tested generate an amplified fragment of the size expected for reverse transcriptase fragments of Ty1-copia group retrotransposons. Sequence analysis of subclones shows that the PCR fragments display varying degrees ...
متن کاملActivation of Ty1-copia Group Retrotransposons of Dendrobium officinale under Abiotic Stress Conditions
By using universal primer Ty1-copia retrotransposon reverse transcriptase (RT), the conserved reverse transcriptase domain of about 260 bp, which was induced by cold stress and osmotic stress, was amplified by RTPCR from the Dendrobium officinale in this study, indicating that the retrotransposon could be activated by stress conditions. The amplicons were recovered and cloned for sequencing and...
متن کاملHeterogeneity in Ty1-copia group of retroelements in chickpea (
Retrotransposons constitute a major fraction of plant genomes and these elements may have played a significant role in evolution and sequence organization of genomes. In order to access the diversity of Ty1-copia group of retroelements, reverse transcriptase (RT) sequences were amplified from chickpea genome, using the primers derived from two conserved domains of RT region. Thirty-six RT regio...
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ژورنال
عنوان ژورنال: Molecular Biology and Evolution
سال: 2001
ISSN: 1537-1719,0737-4038
DOI: 10.1093/oxfordjournals.molbev.a003789