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A postmeiotically expressed clone encodes lactate dehydrogenase isozyme X
Abstract:
We have analysed by the DNA sequencing one of the cDNA clones, pPM459, to mRNA abundant in spermatids of mice. This clone contained 535 base pair nucleotides with a coding region for 139 amino acids and a 3' untranslated region including a single polyadenylation signal. Screening of the protein database revealed that the deduced amino acid sequence highly matched the carboxyl terminal residues 192-330 of mouse lactate dehydrogenase isozyme X (LDH-X). Taken together with our previous report which showed transcription of the message hybridizing to pPM459 after meiosis, it was demonstrated that LDH-X mRNA synthesis continued during the postmeiotic phase in spermatogenesis.
Insights
Researchers identified a mouse gene crucial for sperm development. DNA sequencing revealed the gene encodes lactate dehydrogenase isozyme X (LDH-X) mRNA, confirming its role in post-meiotic sperm maturation.
Area of Science:
- Reproductive Biology
- Molecular Genetics
- Biochemistry
Background:
- Spermatogenesis involves complex gene expression changes.
- Lactate dehydrogenase isozyme X (LDH-X) is vital for sperm function.
- Understanding gene regulation during post-meiotic sperm development is crucial.
Purpose of the Study:
- To analyze a cDNA clone (pPM459) abundant in mouse spermatids.
- To identify the protein encoded by this clone.
- To investigate the role of LDH-X mRNA synthesis during spermatogenesis.
Main Methods:
- DNA sequencing of the cDNA clone pPM459.
- Bioinformatic screening of protein databases.
- Analysis of mRNA transcription in post-meiotic spermatids.
Main Results:
- The cDNA clone pPM459 contains a coding region for 139 amino acids.
- The deduced amino acid sequence matches mouse lactate dehydrogenase isozyme X (LDH-X).
- LDH-X mRNA synthesis was confirmed to continue after meiosis.
Conclusions:
- The gene product of pPM459 is mouse lactate dehydrogenase isozyme X (LDH-X).
- LDH-X mRNA synthesis persists in the post-meiotic phase of spermatogenesis.
- This finding contributes to understanding the molecular mechanisms of male gamete development.