Characterization and chromosomal organization of Ty1-copia retrotransposons in wax gourd

文献类型： 外文期刊

第一作者： Jiang, Biao

作者： Jiang, Biao;Liu, Wenrui;Peng, Qingwu;He, Xiaoming;Xie, Dasen;Jiang, Biao;Liu, Wenrui;He, Xiaoming;Xie, Dasen

作者机构：

关键词： FISH;Heterogeneity;Reverse transcriptase;Ty1-copia retrotransposons;Wax gourd

期刊名称：GENE （ 影响因子：3.688； 五年影响因子：3.329 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Wax gourd (2n. =. 2. x=. 24) is an important vegetable species in Cucurbitaceae. Because it can be stored for a very long period of time, it plays an important role in ensuring the annual supply and regulating off-season supply of the vegetables. However, the availability of genetic information about wax gourd is limited. This study aimed to identify the useful genetic information for wax gourd. The conserved domains of reverse transcriptase (RT) genes of Ty1-. copia retrotransposons were isolated from the genome of wax gourd using degenerate oligonucleotide primers. A total of twenty eight RT sequences were obtained, which showed high heterogeneity with the similarity ranging from 47.5% to 94.3%. Sixteen (57.1%) of them were found to be defective, being disrupted by stop codons and/or frameshift mutations. These 28 sequences were divided into five subfamilies. The comparative phylogenetic analysis with other Cucurbitaceae species from GenBank database showed that most retrotransposons derived from the same genus tended to cluster together, although there were a few exceptions. These results indicate that both vertical transmission and horizontal transmission are the sources of Ty1-. copia retrotransposons in wax gourd. Fluorescent in situ hybridization (FISH) with Ty1-. copia retrotransposon sequences as probes revealed that this kind of retrotransposons had a dispersed genomic organization, physically distributed among all the chromosomes of wax gourd, with clusters in the heterochromatin regions. This is the first report of Ty1-. copia retrotransposons in wax gourd, which would be helpful for our understanding about the organization and evolutions of wax gourd genome and also provide valuable information for our utilization of wax gourd retrotransposons.

分类号： R394

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