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Expression of germ cell nuclear factor (GCNF/RTR) during spermatogenesis
Y L Zhang1, K M Akmal, J K Tsuruta
1State Key Laboratory of Molecular Biology, Shanghai Institute of Biochemistry, Chinese Academy of Sciences, China.
Molecular Reproduction and Development
|April 21, 1998
Summary
Germ cell nuclear factor (GCNF/RTR) is a nuclear receptor primarily in developing germ cells. Its expression in round spermatids suggests a role in regulating transcription during sperm development.
Area of Science:
- Reproductive Biology
- Molecular Endocrinology
- Genetics
Background:
- Germ cell nuclear factor (GCNF/RTR) is an orphan nuclear receptor expressed in developing germ cells.
- Two GCNF/RTR mRNA transcripts (2.3-kb and 7.4/8.0-kb) exist in mammalian testes, with differential expression patterns.
Purpose of the Study:
- To investigate the expression patterns and regulation of GCNF/RTR transcripts during spermatogenesis.
- To identify the potential role of GCNF/RTR in regulating gene transcription in germ cells.
Main Methods:
- Analysis of GCNF/RTR mRNA expression in testicular cells (mouse and rat) using techniques like in situ hybridization and RNase protection assays.
- Detection and quantification of GCNF/RTR transcripts at different stages of testicular development and the spermatogenic cycle.
Main Results:
- GCNF/RTR transcripts were found in spermatogenic cells but not Sertoli cells.
- The larger 7.4-kb mRNA appeared earlier in testicular development, while the major 2.3-kb transcript was predominant in round spermatids.
- GCNF/RTR transcript levels peaked in round spermatids at stages VII-VIII and decreased during elongation, with an alternative polyadenylation signal identified.
Conclusions:
- GCNF/RTR expression is differentially regulated during spermatogenesis, with a specific role in round spermatids.
- GCNF/RTR likely plays a crucial role in regulating transcription during the critical phase of nuclear elongation and condensation in spermatogenesis.