Structure and dynamics of retrotransposons at wheat centromeres and pericentromeres

文献类型： 外文期刊

第一作者： Liu, Zhao

作者： Liu, Zhao;Yue, Wei;Li, Dayong;Kong, Xiuying;Lu, Kun;Dong, Yushen;Zhang, Xueyong;Wang, Richard R-C;Wang, Guixiang;Jin, Weiwei

作者机构：

期刊名称：CHROMOSOMA （ 影响因子：4.316； 五年影响因子：4.159 ）

ISSN： 0009-5915

年卷期： 2008 年 117 卷 5 期

页码：

收录情况： SCI

摘要： Little is known of the dynamics of centromeric DNA in polyploid plants. We report the sequences of two centromere-associated bacterial artificial chromosome clones from a Triticum boeoticum library. Both autonomous and non-autonomous wheat centromeric retrotransposons (CRWs) were identified, both being closely associated with the centromeres of wheat. Fiber-fluorescence in situ hybridization and chromatin immunoprecipitation analysis showed that wheat centromeric retrotransposons (CRWs) represent a dominant component of the wheat centromere and are associated with centromere function. CRW copy number showed variation among different genomes: the D genome chromosomes contained fewer copies than either the A or B genome chromosomes. The frequency of lengthy continuous CRW arrays was higher than that in either rice or maize. The dynamics of CRWs and other retrotransposons at centromeric and pericentromeric regions during diploid speciation and polyploidization of wheat and its related species are discussed.

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