UTF1, a putative marker for spermatogonial stem cells in stallions.
Authors: Jung Heejun, Roser Janet F, Yoon Minjung
Journal: PloS one
Summary
# UTF1 as a Spermatogonial Stem Cell Marker in Stallions Identifying and isolating spermatogonial stem cells (SSCs) in stallions has significant implications for reproductive technologies, particularly in preserving genetics from geldings and treating subfertile individuals; Jung et al. investigated whether UTF1 (undifferentiated cell transcription factor 1)—already established as an SSC marker in humans and rodents—could reliably identify these cells in equine testicular tissue. Using Western blot analysis and immunohistochemistry on samples from stallions aged from pre-puberty through adulthood, combined with whole mount staining to characterise specific spermatogonial populations, the researchers demonstrated that UTF1 expression shifts markedly across developmental stages: abundant in germ cells during pre- and pubertal development, but restricted to a small population of basal compartment cells in post-pubertal and adult stallions, specifically labelling A(s), A(pr), and chains of A(al) undifferentiated spermatogonia. For equine practitioners involved in breeding programmes, assisted reproductive technologies, or managing subfertility, this work establishes UTF1 as a validated tool for identifying and potentially isolating SSCs in stallions, opening practical pathways for cryopreservation and regenerative approaches that were previously difficult to implement in the species.
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Practical Takeaways
- •UTF1 can be used as a reliable immunological marker to identify undifferentiated spermatogonia in stallions, enabling better selection of stem cells for cryopreservation and future fertility therapies
- •This marker could support development of assisted reproductive techniques to preserve genetics from geldings or subfertile stallions
- •UTF1 expression patterns differ markedly between developmental stages, suggesting age-dependent considerations for optimal stem cell harvesting timing
Key Findings
- •UTF1 is expressed predominantly in germ cells during pre-pubertal and pubertal stages, with expression limited to basal compartment cells in post-pubertal and adult stallions
- •UTF1-positive cells include A(s), A(pr), and chains of A(al) spermatogonia, identifying undifferentiated spermatogonia populations
- •UTF1 antibody demonstrates specific cross-reactivity with equine testicular tissue without labeling Sertoli or Leydig cells
- •UTF1 is a suitable marker for identifying and potentially isolating spermatogonial stem cells in stallions for reproductive applications