Genomic location and expression analysis of expansin gene family reveals the evolutionary and functional significance in Triticum aestivum

文献类型： 外文期刊

第一作者： Li, Nana

作者： Li, Nana;Pu, Yanyan;Gong, Yongchao;Ding, Hanfeng;Yu, Yanli

作者机构：

关键词： Genome-wide analysis;Expansin;Gene family;Triticum aestivum

期刊名称：GENES & GENOMICS （ 影响因子：1.839； 五年影响因子：1.329 ）

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收录情况： SCI

摘要： The plant-specific expansin proteins constitute an ancient and major gene family known to have roles in regulating diverse biological processes in plants. Although the functions of many expansin genes have been identified in wheat and other species, little is known about the evolution and genomic locations of the expansin genes in wheat (Triticum aestivum). In this study, a total of 87 expansin genes were identified in the wheat genome, including 52 EXPAs, 42 EXPBs and 4 EXLAs. The EXLB gene was not found in the wheat genome. Phylogenetic tree and comparative analysis revealed amplification of the EXPBs in rice, maize and wheat. The predicted wheat expansins were distributed across 14 of 21 chromosomes with different densities, 3 tightly co-located clusters and 15 paralogous pairs, indicating that tandem duplication and segmental duplication events also played roles in the evolution of expansins in wheat. In addition, the gene structures and conserved protein domains of wheat expansins suggest high levels of conservation within the phylogenetic subgroups. Analysis of a published microarray database showed that most wheat expansin genes exhibit different expression levels in different tissues and developmental stages. To our knowledge, this is the first report of a genome-wide analysis of the wheat expansin gene family, which should provide valuable information for further elucidating the classification and putative functions of the entire gene family.

分类号： Q

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