Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis

Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis

Gonadal sex differentiation proceeds by the interplay of various genes including the transcription factors and secretory factorsin a complex network. Dmrt1 and Sox9 were considered to be the essential genes involved in the testicular differentiation in mammals,birds, reptiles, and fishes. Here, we have successfully isolated and characterized cDNAs encoding the Rana chensinensis orthologs ofDmrt1 and Sox9, and we have determined patterns of expression during gonadal differentiation and adult tissues. At the molecular level,a clear sexual dimorphism of rcDmrt1 and rcSox9 was observed in the gonad-mesonephros complex or gonads of tadpoles during stages26–46. The rcDmrt1 transcript was first detected in undifferentiated gonads at stage 30 and became stronger at stages 32–36. Thereafter,the rcDmrt1 transcript was only observed in males and gradually increased from stage 42 to stage 46. By contrast, rcSox9 was observed inthe whole gonadal differentiation period (stages 26–46) of males and females. In adult frogs, Dmrt1 was merely detected in testes, whilercSox9 was more highly expressed in the brain, liver, and testes. These results showed that both Dmrt1 and Sox9 participate in gonadaldifferentiation, and Dmrt1 is more closely implicated in testicular differentiation.

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