Identification of TPX2 Gene Family in Upland Cotton and its Functional Analysis in Cotton Fiber Development

文献类型： 外文期刊

第一作者： Kang Lei;;Aiying Liu;;Senmiao Fan

作者： Kang Lei;Aiying Liu;Senmiao Fan;Huo Peng;Xianyan Zou;Zhang Zhen;Jinyong Huang;Liqiang Fan;Zhibin Zhang;Xiaoying Deng;Qun Ge;Wankui Gong;Junwen Li;Juwu Gong;Yuzhen Shi;Xiao Jiang;Shuya Zhang;Tingting Jia;Lipeng Zhang;Youlu Yuan;Haihong Shang

作者机构：

关键词： upland cotton; Xklp2 (TPX2) gene family; gene expression; MAP; protein interactions

期刊名称：GENES （ 影响因子：4.096； 五年影响因子：4.339 ）

ISSN： 2073-4425

年卷期： 2019 年 10 卷 7 期

页码：

收录情况： SCI

摘要： Microtubules (MTs) are of importance to fiber development. The Xklp2 (TPX2) proteins as a class of microtubule-associated proteins (MAPs) play a key role in plant growth and development by regulating the dynamic changes of microtubules (MTs). However, the mechanism underlying this is unknown. The interactions between TPX2 proteins and tubulin protein, which are the main structural components, have not been studied in fiber development of upland cotton. Therefore, a genome-wide analysis of the TPX2 family was firstly performed in Gossypium hirsutum L. This study identified 41 GhTPX2 sequences in the assembled G. hirsutum genome by a series of bioinformatic methods. Generally, this gene family is phylogenetically grouped into six subfamilies, and 41 G. hirsutum TPX2 genes (GhTPX2s) are distributed across 21 chromosomes. A heatmap of the TPX2 gene family showed that homologous GhTPX2 genes, GhWDLA2/7 and GhWDLA4/9, have large differences in expression levels between two upland cotton recombinant inbred lines (69307 and 69362) that are different in fiber quality at 15 and 20 days post anthesis. The relative data indicate that these four genes are down-regulated under oryzalin, which causes microtubule depolymerization, as determined via qRT-PCR. A subcellular localization experiment suggested that GhWDLA2 and GhWDLA7 are localized to the microtubule cytoskeleton, and GhWDLA4 and GhWDLA9 are only localized to the nucleus. However, only GhWDLA7 between GhWDLA2 and GhWDLA7 interacted with GhTUA2 in the yeast two-hybrid assay. These results lay the foundation for further function study of the TPX2 gene family.

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