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28 s and 18 s ribonucleic acid from mammalian spermatozoa
The Journal of Experimental Zoology
|October 1, 1976
Abstract:
The majority of RNA is spermatozoa from the epididymis and ductus deferens of mice was found to be 28 s and 18 s RNA. This RNA was also seen in human ejaculated spermatozoa. Our evidence indicates that little or none of the 28 s and 18 s RNA is transcribed in the maturing mouse spermatozoa and that the majority is synthesized in the primary spermatocyte. This RNA may be necessary to maintain post-meiotic translation during spermatogenesis.
Insights
Spermatozoa contain significant 28s and 18s ribosomal RNA, primarily synthesized during primary spermatocyte stages, not during sperm maturation. This RNA may support post-meiotic translation.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Spermatogenesis
Background:
- Ribosomal RNA (rRNA) is crucial for protein synthesis.
- Spermatozoa contain RNA, but its origin and function during maturation are not fully understood.
- Previous studies suggest limited transcriptional activity in mature spermatozoa.
Purpose of the Study:
- To investigate the origin and types of RNA present in mouse and human spermatozoa.
- To determine if 28s and 18s RNA are transcribed during sperm maturation.
- To explore the potential role of this RNA in post-meiotic translation.
Main Methods:
- Isolation and analysis of RNA from mouse epididymis and ductus deferens spermatozoa.
- Analysis of RNA from human ejaculated spermatozoa.
- RNA synthesis assays to assess transcriptional activity.
Main Results:
- The majority of RNA in mouse and human spermatozoa consists of 28s and 18s ribosomal RNA.
- Evidence suggests minimal to no transcription of 28s and 18s RNA in maturing mouse spermatozoa.
- The bulk of this RNA is synthesized earlier, in primary spermatocytes.
Conclusions:
- Spermatozoa carry significant amounts of 28s and 18s rRNA.
- This rRNA is largely maternally inherited or synthesized during spermatogenesis, not during epididymal maturation.
- The presence of this RNA may be essential for maintaining protein synthesis after meiosis.