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Published on: December 19, 2011
Comprehensive Genome-Wide Analysis of Dmrt Transcription Factors Reveals Their Roles in Sexual Dimorphism in
Zhiqiang Li1, Jingjing Guo1, Ghulam Nabi2
1Hubei Shizhen Laboratory, Key Laboratory of Chinese Medicinal Resource and Chinese Herbal Compound of Ministry of Education, School of Basic Medical Sciences, Hubei University of Chinese Medicine, Wuhan 430065, China.
Abstract:
The double-sex and mab-3-related transcription factors (Dmrt) are widely distributed in the animal kingdom and play a crucial role in sex determination and differentiation. In this study, we identified eight Dmrt transcription factors in the genome of the centipede Scolopendra mutilans, including five Dsx-related genes (as Dsx1, Dsx2 (five splice variants), Dsx3, Dsx4 and Dsx5) and three Dmrt-related genes (as Dmrt11E, Dmrt99B, and Dmrt93B). Phylogenetic analysis revealed evolutionary conservation across arthropods, with Dsx genes clustered into class-specific clades (Chilopoda, Insecta, Crustacea, Arachnida). Structural analysis confirmed conserved DM domains and sex-specific motifs, with tandem duplication of Dsx2 on chromosome 4. Expression profiling demonstrated significant sexual dimorphism: Dsx5 was female-biased, whereas Dsx2, Dsx3, and Dsx4 were male-biased, suggesting their functional divergence in sexual differentiation. Correlation analysis linked the expression of Sxl and Fem-1C to the regulation of Dsx isoforms, suggesting the presence of a conserved upstream regulatory cascade for sex-specific splicing. These findings elucidate the structural and functional landscape of Dmrts in S. mutilans, and provide insights into how sex-determination mechanisms evolved in Myriapoda.
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