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

State Key Laboratory of Cotton Biology, Key Laboratory of Biological and Genetic Breeding of Cotton, The Ministry of Agriculture, Institute of Cotton Research, Chinese Academy of Agricultural Sciences, Anyang 455000, Henan China
Zhengzhou Research Base, State Key Laboratory of Cotton Biology, Zhengzhou University, Zhengzhou 450000, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Genes 2019, 10(7), 508;
Received: 28 May 2019 / Revised: 1 July 2019 / Accepted: 2 July 2019 / Published: 4 July 2019
(This article belongs to the Section Plant Genetics and Genomics)
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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. View Full-Text
Keywords: upland cotton; Xklp2 (TPX2) gene family; gene expression; MAP; protein interactions upland cotton; Xklp2 (TPX2) gene family; gene expression; MAP; protein interactions

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Lei, K.; Liu, A.; Fan, S.; Peng, H.; Zou, X.; Zhen, Z.; Huang, J.; Fan, L.; Zhang, Z.; Deng, X.; Ge, Q.; Gong, W.; Li, J.; Gong, J.; Shi, Y.; Jiang, X.; Zhang, S.; Jia, T.; Zhang, L.; Yuan, Y.; Shang, H. Identification of TPX2 Gene Family in Upland Cotton and its Functional Analysis in Cotton Fiber Development. Genes 2019, 10, 508.

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