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Identification and diversity of functional centromere satellites in the wild rice species oryza brachyantha

Identification and diversity of functional centromere satell...

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江苏省遗传学会2013年学术研讨会

作者： ChuANDeng Yi Xibin Dai Xing Li Yong Zhou Guohua Liang Minghong Gu Key Laboratory of Crop Genetics and Physiology of Jiangsu Province Key Laboratory of Plant Functional Genomics of Ministry of Education College of Agriculture Yangzhou University

The centromere is a key chromosomal component for sister chromatid cohesion and is the site for kinetochore assembly and spindle fiber attachment, allowing each sister chromatid to faithfully segregate to each daughter cell during cell division. It is not clear what types of sequences act as functional centromeres and how centromere sequences are organized in oryza brachyantha, an FF genome species. In this study, we found that the three classes of centromere-specific CentO-F satellites（CentO-F1, CentO-F2 and CentO-F3） in O. brachyantha share no homology with the CentO satellites in O. sativa. The three classes of CentO-F satellites are all located within the chromosomal regions to which the spindle fibers attach and are characterized by megabase tandem arrays that are flanked by centromere-specific retrotransposons, CRR-F, in the O. brachyantha centromeres. Although these CentO-F satellites are quantitatively variable among 12 O. brachyantha centromeres, immunostaining with an antibody specific to CENH3 indicates that they are colocated with CENH3 in functional centromere regions. Our results demonstrate that the three classes of CentO-F satellites may be the major components of functional centromeres in O. brachyantha.

关键词： centromere oryza brachyantha satellite DNA repetitive DNA

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oryza genome evolution revealed by whole genome comparative analysis between oryza brachyantha and oryza sativa

Oryza genome evolution revealed by whole genome comparative ...

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2011全国植物生物学研讨会

作者： Jinfeng Chen,Mingsheng Chen~* Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Beijing 100101

The genus oryza consists of 24 species,which represented by ten genome types, including six diploid(AA,BB,CC,EE,FF,GG) and four allotetraploid genome types (BBCC,CCDD,HHKK,HHJJ).These wild rice populations were distributed in a diverse range of habitats and had large diversity in morphological and physiological *** wild species provide a great resource for rice *** brachyantha,which belongs to the FF genome type,is a wild rice species distributed in central *** small genome size,unique features in centromere composition and transposable element distribution make oryza brachyantha an ideal species to

关键词： oryza brachyantha wild rice genome evolution comparative genomics

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