Gonad differentiation in the rabbit: evidence of species-specific features

PLoS One. 2013 Apr 8;8(4):e60451. doi: 10.1371/journal.pone.0060451. Print 2013.

Abstract

The rabbit is an attractive species for the study of gonad differentiation because of its 31-day long gestation, the timing of female meiosis around birth and the 15-day delay between gonadal switch and the onset of meiosis in the female. The expression of a series of genes was thus determined by qPCR during foetal life until adulthood, completed by a histological analysis and whenever possible by an immunohistological one. Interesting gene expression profiles were recorded. Firstly, the peak of SRY gene expression that is observed in early differentiated XY gonads in numerous mammals was also seen in the rabbit, but this expression was maintained at a high level until the end of puberty. Secondly, a peak of aromatase gene expression was observed at two-thirds of the gestation in XX gonads as in many other species except in the mouse. Thirdly, the expression of STRA8 and DMC1 genes (which are known to be specifically expressed in germ cells during meiosis) was enhanced in XX gonads around birth but also slightly and significantly in XY gonads at the same time, even though no meiosis occurs in XY gonad at this stage. This was probably a consequence of the synchronous strong NANOS2 gene expression in XY gonad. In conclusion, our data highlighted some rabbit-specific findings with respect to the gonad differentiation process.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biomarkers / metabolism
  • Cell Differentiation*
  • Female
  • Fetus / cytology
  • Fetus / embryology
  • Fetus / metabolism
  • Gene Expression Regulation, Developmental
  • Male
  • Meiosis
  • Mice
  • Ovary / cytology*
  • Ovary / embryology*
  • Ovary / metabolism
  • Ovum / cytology
  • Ovum / metabolism
  • Puberty
  • Rabbits
  • Species Specificity
  • Spermatozoa / cytology
  • Spermatozoa / metabolism
  • Testis / cytology*
  • Testis / embryology*
  • Testis / metabolism
  • Tretinoin / metabolism

Substances

  • Biomarkers
  • Tretinoin

Grants and funding

This work was supported by the Agence Nationale de la Recherche (ANR-GenAnimal GENIDOV 2010/13). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.