The wheat omega-gliadin genes: structure and EST analysis

文献类型： 外文期刊

第一作者： Anderson, Olin D.

作者： Anderson, Olin D.;Gu, Yong Q.;Lazo, Gerard R.;Wu, Jiajie;Kong, Xiuying;Wu, Jiajie;Wu, Jiajie

作者机构：

关键词： Omega gliadins;Wheat seed;Gene structure;Gene expression;ESTs;Triticum aestivum;Sequence;Cereal;Gene families

期刊名称：FUNCTIONAL & INTEGRATIVE GENOMICS （ 影响因子：3.41； 五年影响因子：3.616 ）

ISSN： 1438-793X

年卷期： 2009 年 9 卷 3 期

页码：

收录情况： SCI

摘要： A survey and analysis is made of all available omega-gliadin DNA sequences including omega-gliadin genes within a large genomic clone, previously reported gene sequences, and ESTs identified from the large wheat EST collection. A contiguous portion of the Gli-B3 locus is shown to contain two apparently active omega-gliadin genes, two pseudogenes, and four fragments of the 3' portion of omega-gliadin sequences. Comparison of omega-gliadin sequences allows a phylogenetic picture of their relationships and genomes of origin. Results show three groupings of omega-gliadin active gene sequences assigned to each of the three hexaploid wheat genomes, and a fourth group thus far consisting of pseudogenes assigned to the A-genome. Analysis of omega-gliadin ESTs allows reconstruction of two full-length model sequences encoding the AREL- and ARQL-type proteins from the Gli-A3 and Gli-D3 loci, respectively. There is no DNA evidence of multiple active genes from these two loci. In contrast, ESTs allow identification of at least three to four distinct active genes at the Gli-B3 locus of some cultivars. Additional results include more information on the position of cysteines in some omega-gliadin genes and discussion of problems in studying the omega-gliadin gene family.

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