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Multiple alternative splicing of mouse Dmrt1 during gonadal differentiation
Heng Lu1, Xiao Huang, Liao Zhang
1Department of Genetics and Center for Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, PR China.
Biochemical and Biophysical Research Communications
|December 5, 2006
Summary
The Doublesex and mab-3 related transcription factor 1 (Dmrt1) gene produces multiple transcripts through alternative splicing. These Dmrt1 variants are crucial for gonad development and sex differentiation in mice.
Area of Science:
- Developmental Biology
- Genetics
- Molecular Biology
Background:
- Doublesex and mab-3 related transcription factor 1 (Dmrt1) is an evolutionarily conserved gene essential for male gonad development and testis differentiation.
- Dmrt1 expression is restricted to the gonads.
Purpose of the Study:
- To investigate the alternative splicing of mouse Dmrt1 transcripts during gonad development and in adult testes.
- To characterize the expression patterns of different Dmrt1 isoforms in developing and adult gonads.
Main Methods:
- Reverse transcription polymerase chain reaction (RT-PCR) to detect Dmrt1 transcripts.
- Northern blot analysis to assess Dmrt1 transcript expression levels.
- Real-time fluorescent quantitative RT-PCR for precise expression quantification.
Main Results:
- Four distinct Dmrt1 transcripts (Dmrt1 a, b, c, and d) were identified in mouse developing gonads and adult testes, generated by alternative splicing.
- All Dmrt1 transcripts exhibited gonad-specific and sexually dimorphic expression during gonadogenesis, with peak expression at 13.5 days post coitum (dpc) in both sexes.
- Dmrt1 a was the predominant transcript, and its expression decreased in adult ovaries but remained detectable in adult testes, while female expression diminished.
Conclusions:
- Alternative splicing of Dmrt1 generates multiple protein isoforms with potentially distinct functions in sex determination.
- The sexually dimorphic expression of Dmrt1 transcripts highlights the importance of post-transcriptional regulation in governing mammalian sex differentiation.
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