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Expression pattern of the mitochondrial capsule selenoprotein mRNA in the mouse testis after puberty; in situ
1Department of Veterinary Anatomy, Graduate School of Agriculture and Life Sciences, University of Tokyo, Japan.
Abstract:
Mitochondrial capsule selenoprotein (MCS) has been known as a structural protein of the mitochondrial sheath in spermatozoa. In this study, to determine the expression pattern of MCS mRNA in the mouse testis after puberty, in situ hybridization using digoxigenin-labeled RNA probes for MCS was performed in the testes of 8- and 20-week-old ICR mice. In the testes of both ages, MCS mRNA first appeared in step 3 round spermatids, gradually increased during early spermiogenesis, and persisted a high level until step 14 spermatids. After the step 14 spermatids, the signal began to decline and was weakly detected in steps 15-16 spermatids. On the other hand, compared with that in the testes of 8-week-old mice, MCS mRNA level in the testes of 20-week-old mice increased over 2-fold at stages VI-III, while it slightly increased at stages IV-V. These findings suggest that MCS gene transcription may be up-regulated after puberty in the mouse testis.
Insights
Mitochondrial capsule selenoprotein (MCS) mRNA is present in developing sperm cells after puberty. Its expression increases significantly in mature mouse testes, suggesting gene up-regulation post-puberty.
Area of Science:
- Reproductive Biology
- Molecular Biology
- Spermatogenesis Research
Background:
- Mitochondrial capsule selenoprotein (MCS) is a known structural protein of the sperm's mitochondrial sheath.
- Understanding MCS gene expression is crucial for insights into male reproductive health.
Purpose of the Study:
- To investigate the expression pattern of MCS mRNA in the mouse testis after puberty.
- To determine if MCS gene transcription is affected by post-pubertal development.
Main Methods:
- In situ hybridization was employed using digoxigenin-labeled RNA probes for MCS.
- Experiments were conducted on the testes of 8- and 20-week-old ICR mice.
Main Results:
- MCS mRNA was detected in round spermatids (step 3) and increased through early spermiogenesis, peaking at step 14.
- Expression declined in later spermatid stages (steps 15-16).
- MCS mRNA levels were over 2-fold higher in 20-week-old mice testes compared to 8-week-old mice, particularly at stages VI-III.
Conclusions:
- MCS mRNA expression is developmentally regulated during mouse spermatogenesis.
- MCS gene transcription appears to be up-regulated in the mouse testis after puberty.