Abstract
Sox protein family is characterized by the presence of the conserved high-mobility group (HMG) box. Sox transcription factors are involved in diverse developmental process in animals, including sex-determination, organogenesis, embryogenesis, neurogenesis, and cell fate decision. In this study, 23 Sox genes were identified based on the Culter alburnus whole-genome sequence and categorized into six subfamilies according to the conserved HMG-box domain. The duplicates of four members revealed that Sox genes in the teleost fishes underwent significant expansion. Moreover, their expression pattern in gonad tissues were analyzed by RNA-seq and qRT-PCR, and Sox9b was determined as a key gene that was essential for testis development. This current study will provide new insight into the role of Sox gene family in fish sex determination and differentiation.
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