文献类型: 外文期刊
第一作者: Shimatani, Zenpei
作者: Shimatani, Zenpei;Takagi, Kyoko;Eun, Chang-Ho;Hoshino, Atsushi;Terada, Rie;Johzuka-Hisatomi, Yasuyo;Iida, Shigeru;Tsugane, Kazuo;Shimatani, Zenpei;Hoshino, Atsushi;Terada, Rie;Iida, Shigeru;Tsugane, Kazuo;Maekawa, Masahiko;Takahara, Hiroyuki;Qian, Qian;Qian, Qian
作者机构:
关键词: Autonomous elements;DNA transposon;Epigenetic silencing;hAT superfamily;Transposition activity;Rice
期刊名称:MOLECULAR GENETICS AND GENOMICS ( 影响因子:3.291; 五年影响因子:3.257 )
ISSN: 1617-4615
年卷期: 2009 年 281 卷 3 期
页码:
收录情况: SCI
摘要: An endogenous 0.6-kb rice DNA transposon, nDart1-0, was found as an active nonautonomous element in a mutable virescent line, pyl-v, displaying leaf variegations. Here, we demonstrated that the active autonomous element aDart in pyl-v corresponds to Dart1-27 on chromosome 6 in Nipponbare, which carries no active aDart elements, and that aDart and Dart1-27 are identical in their sequences and chromosomal locations, indicating that Dart1-27 is epigenetically silenced in Nipponbare. The identification of aDart in pyl-v was first performed by map-based cloning and by detection of the accumulated transposase transcripts. Subsequently, various transposition activities of the cloned Dart1-27 element from Nipponbare were demonstrated in Arabidopsis. Dart1-27 in Arabidopsis was able to excise nDart1-0 and Dart1-27 from cloned sites, generating footprints, and to integrate into new sites, generating 8-bp target site duplications. In addition to Dart1-27, Nipponbare contains 37 putative autonomous Dart1 elements because their putative transposase genes carry no apparent nonsense or frameshift mutations. Of these, at least four elements were shown to become active aDart elements in transgenic Arabidopsis plants, even though considerable sequence divergence arose among their transposases. Thus, these four Dart1 elements and Dart1-27 in Nipponbare must be potential autonomous elements silenced epigenetically. The regulatory and evolutionary implications of the autonomous Dart1 elements and the development of an efficient transposon-tagging system in rice are discussed.
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