Generation of Antibodies Against DMRT1 and DMRT4 of Oreochromis aurea and Analysis of Their Expression Profile in Oreochromis aurea Tissues

Jinling Cao; Zhemin Cao; Tingting Wu

doi:10.1016/S1673-8527(07)60055-1

Volume 34 Issue 6

Jun. 2007

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Article Navigation > Journal of Genetics and Genomics > 2007 > 34(6): 497-509

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Generation of Antibodies Against DMRT1 and DMRT4 of Oreochromis aurea and Analysis of Their Expression Profile in Oreochromis aurea Tissues

doi: 10.1016/S1673-8527(07)60055-1

a
Fishery College, Nanjing Agricultural University, Wuxi 214081, China
b
Key Open Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, Ministry of Agriculture, Freshwater Fishery Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China

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Corresponding author: E-mail address: wutt@ffrc.cn (Tingting Wu)
Received Date: 2006-07-21
Accepted Date: 2006-11-20

Available Online: 2007-06-27

Publish Date: 2007-06-20

Abstract

Abstract

Sex determination is composed of somatic and germ-line sex differentiation hierarchies whose interaction is poorly understood. A single gene known to control somatic sex determination, the DM-domain containing (Doublesex/Mab-3 DNA-binding motif) gene, is highly conserved across species. Vertebrate DMRT1 (DM-related transcription factor 1) expression occurs predominantly in the testis. Here, however, isolated two distinct DM-domain cDNA from Oreochromis aurea ovary and testis have been named DMRT4 (DM-related transcription factor 4) and DMRT1 by BLAST, respectively. Despite high homology in the DM-domain, there is little similarity outside the DM-domain. To better understand the structure, function, and possible roles of DMRT4 and DMRT1 as potential candidates for sex differentiation and sex determination, the intact regions encoding DMRT4 and DMRT1 obtained by PCR were sub-cloned into the vector pMAL-c2x and introduced into the Escherichia coli TB1 cell for efficient fusion expression. After purification and cleavage, DMRT4 and DMRT1 proteins were used to immunize adult rabbits following standard protocols. Consequently, it was found by using Western blot analysis that polyclonal antibodies against DMRT4 and DMRT1 had high specificity. The relative expression levels of DMRT4 and DMRT1 mRNA were determined by fluorescent Real-time RT-PCR in female and male Oreochromis aurea with β-actin as the internal standard. DMRT1 was expressed only in testis, whereas DMRT4 was over expressed in the ovary, but in both female and male, a slight expression in the brain was also detected. Statistical analysis showed that in the brain, mean DMRT4 mRNA levels in female were significantly higher than in male. Meanwhile, the expression of DMRT4 and DMRT1 protein was also analyzed using the purified antibodies through Western blot and immunohistochemistry. It was found that DMRT4 was exclusively expressed in the ovary and DMRT1 in the testis. Study on DMRT4 and DMRT1 expression facilitated the elucidation of their roles and the understanding of sex differentiation of fish.
- DMRT1,
- DMRT4,
- prokaryotic expression,
- polyclonal antibody,
- expression profile

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References(40)

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