Cloning, identification and characterization of a repetitive sequence flanking telomere and homologous to canrep in Brassica napus

文献类型： 外文期刊

第一作者： Li, Chen

作者： Li, Chen;Yang, Qing;Li, Chen;Yan, Xiao-Hong;Wang, Li-Jun;Wei, Wen-Hui;Huang, Bin

作者机构：

关键词： Brassica napus;Centromere;Satellite DNA;Subtelomere;Telomeric repeat

期刊名称：BOTANICAL STUDIES （ 影响因子：2.787； 五年影响因子：2.871 ）

ISSN： 1817-406X

年卷期： 2010 年 51 卷 4 期

页码：

收录情况： SCI

摘要： Satellite DNAs consist of long tandem arrays of short or large repeated sequences that form the centromeric and sometimes also subtelomeric regions of all higher eukaryote chromosomes. Telomeres and centromeres are the most important elements involved in the structure and function of chromosome. Telomeric DNA sequences are conserved among nearly all plant species. Although centromere-specific DNA sequences have been isolated in a wide range of plant species, almost no conservation was found in their DNA sequences. Here, we utilized the cassette-ligation-mediated PCR approach for cloning the sequence near the telomeric repeats of Brassica napus. Sequences analysis showed that one sequence was highly homologous to the centromeric satellite DNA sequence reported. FISH revealed that this satellite was located primarily at centromeric regions of most chromosomes, and also at some chromosome ends. The sequence was a subtelomeric satellite DNA which possessed variability in the evolution of chromosomes of Brassica species. The phylogenetic tree analysis of the satellite showed its sequence was conservative in Brassica. We discussed why the centromeric satellites appeared in the subtelomeric region.

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