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      Molecular Characterization, Tissue Distribution and Localization of Larimichthys crocea Kif3a and Kif3b and Expression Analysis of Their Genes During Spermiogenesis

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          KIF3A and KIF3B are two N-terminal motor proteins belonging to the kinesin-II superfamily that play essential roles in spermiogenesis. To understand the roles played by KIF3A/3B during spermatogenesis of large yellow croaker Larimichthys crocea, we studied the testis characteristics at different developmental stages of L. crocea, and determined the spatiotemporal expression patterns of kif3a and kif3b during spermiogenesis. Quantitative real-time PCR (qRT-PCR) showed that the overall trends of kif3a/3b mRNA abundance during testis development are similar. From stage II to stage V, kif3a/3b mRNA abundances first increased and then fell after reaching a peak at stage IV. Interestingly, the mRNA abundances of both genes at stage V were higher than those at stages II and III. In addition, it is worth of noting that kif3b mRNA abundance was higher than that of kif3a at all stages. Fluorescence in situ hybridization results revealed that kif3a/3b mRNA abundance dynamics were consistent with the migration of mitochondria, the deformation of nucleus, and the formation of tail. The mRNA hybridization signals of both genes first appeared either around the nuclear periphery or on the side of the nuclei, then appeared at one side of nuclei, and finally were mainly on the tail during spermiogenesis. Our findings contributed to better understanding the molecular mechanisms of spermiogenesis in fish; and suggested that KIF3A and KIF3B may participate in the intracellular transport of mitochondria, nuclear deformation, and the formation of tail during the spermiogenesis in L. crocea.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          12 November 2019
          01 December 2019
          : 18
          : 6
          : 1451-1469
          1The Key Laboratory of Applied Marine Biotechnology of Ministry of Education, School of Marine Sciences, Ningbo University, Ningbo 315211, China
          Author notes
          *Corresponding author: ZHU Junquan
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2019.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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