The Lin28 Expression in Stallion Testes.
Authors: Lee Geumhui, Jung Heejun, Yoon Minjung
Journal: PloS one
Summary
Lin28, an RNA-binding protein previously characterised in human, murine and primate testes, has potential value as a molecular marker for identifying undifferentiated spermatogonial stem cells in horses. Lee and colleagues examined Lin28 expression patterns across pre-pubertal and post-pubertal stallion testes using reverse transcription polymerase chain reaction, western blotting and immunohistochemical staining, finding that Lin28 localises to the cytoplasm of spermatogonia at both developmental stages, though at markedly different densities: 253 ± 8.66 Lin28-positive cells per 1000 Sertoli cells in pre-pubertal tissue versus only 29.67 ± 2.18 in post-pubertal tissue. Crucially, Lin28-positive cells were restricted to A single (As) and A paired (Apr) spermatogonia—the undifferentiated stem cell populations—and showed co-staining with the DAZL marker but not with GATA4, establishing a distinct immunophenotypic signature. For practitioners involved in stallion fertility assessment and reproductive management, these findings offer a potential tool for more precisely identifying and monitoring spermatogonial stem cell populations during testicular examination, which could have implications for evaluating testicular development, managing subfertile stallions, or optimising breeding programmes through non-invasive diagnostic refinement.
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Practical Takeaways
- •This research provides a molecular tool for future assessment of stallion semen quality and reproductive maturity through Lin28 marker identification
- •Understanding Lin28 expression patterns in different reproductive stages could support diagnostic approaches for stallion fertility evaluation
- •The dramatic decrease in Lin28-positive cells from pre- to post-pubertal stages establishes a potential biomarker for monitoring normal reproductive development
Key Findings
- •Lin28 mRNA and protein are expressed in stallion testes at both pre- and post-pubertal stages
- •Lin28-positive germ cells decreased dramatically from pre-pubertal (253 ± 8.66 per 1000 Sertoli cells) to post-pubertal stages (29.67 ± 2.18 per 1000 Sertoli cells)
- •Lin28 expression is restricted to undifferentiated spermatogonia (As and Apr types) and shows partial co-expression with DAZL but not GATA4
- •Lin28 may serve as a molecular marker for identifying spermatogonial stem cells in stallion testes when used with DAZL antibody