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The Lin28 Expression in Stallion Testes.

Geumhui Lee1, Heejun Jung2, Minjung Yoon1,2

  • 1Department of Horse, Companion, and Wild Animal Science, Kyungpook National University, Sangju, Republic of Korea.

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Lin28, an RNA-binding protein, is expressed in stallion spermatogonia. This study identifies Lin28 as a potential molecular marker for undifferentiated spermatogonial stem cells, particularly when used alongside DAZL.

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Area of Science:

  • Reproductive Biology
  • Molecular Endocrinology
  • Stem Cell Biology

Background:

  • Molecular markers are crucial for identifying and isolating specific germ cell stages.
  • The RNA-binding protein Lin28 is known to be expressed in gonocytes and spermatogonial cells across various species.
  • Understanding Lin28 expression patterns in stallions can aid in reproductive research and applications.

Purpose of the Study:

  • To investigate the expression pattern of Lin28 in stallion testes during pre-pubertal and post-pubertal reproductive stages.
  • To determine if Lin28 can serve as a molecular marker for specific spermatogonial populations in stallions.

Main Methods:

  • Reverse transcription polymerase chain reaction (RT-PCR) to detect Lin28 mRNA.
  • Western blot analysis to confirm protein expression and antibody cross-reactivity.
  • Immunohistochemistry using antibodies for Lin28, GATA4, and DAZL.
  • Whole-mount staining to localize Lin28 expression within spermatogonia.

Main Results:

  • Lin28 mRNA and protein were detected in stallion testicular tissues at both pre-pubertal and post-pubertal stages.
  • Lin28 protein was localized in the cytoplasm of spermatogonia.
  • Lin28-positive cells were significantly more numerous in pre-pubertal testes compared to post-pubertal testes.
  • Lin28 expression was restricted to Asingle (As) and Apaired (Apr) spermatogonia and did not co-stain with GATA4 but partially co-stained with DAZL.

Conclusions:

  • Lin28 is expressed in stallion spermatogonia, with higher levels in pre-pubertal stages.
  • Lin28, in conjunction with DAZL, shows potential as a molecular marker for identifying undifferentiated spermatogonial stem cells in stallions.