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Published in: Reproductive Biology and Endocrinology 1/2011

Open Access 01-12-2011 | Research

Expression of miRNAs in ovine fetal gonads: potential role in gonadal differentiation

Authors: Katie J Torley, Juliano C da Silveira, Peter Smith, Russell V Anthony, DN Rao Veeramachaneni, Quinton A Winger, Gerrit J Bouma

Published in: Reproductive Biology and Endocrinology | Issue 1/2011

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Abstract

Background

Gonadal differentiation in the mammalian fetus involves a complex dose-dependent genetic network. Initiation and progression of fetal ovarian and testicular pathways are accompanied by dynamic expression patterns of thousands of genes. We postulate these expression patterns are regulated by small non-coding RNAs called microRNAs (miRNAs). The aim of this study was to identify the expression of miRNAs in mammalian fetal gonads using sheep as a model.

Methods

We determined the expression of 128 miRNAs by real time PCR in early-gestational (gestational day (GD) 42) and mid-gestational (GD75) sheep ovaries and testes. Expression data were further examined and validated by bioinformatic analysis.

Results

Expression analysis revealed significant differences between ovaries and testes among 24 miRNAs at GD42, and 43 miRNAs at GD75. Bioinformatic analysis revealed that a number of differentially expressed miRNAs are predicted to target genes known to be important in mammalian gonadal development, including ESR1, CYP19A1, and SOX9. In situ hybridization revealed miR-22 localization within fetal testicular cords. As estrogen signaling is important in human and sheep ovarian development, these data indicate that miR-22 is involved in repressing estrogen signaling within fetal testes.

Conclusions

Based on our results we postulate that gene expression networks underlying fetal gonadal development are regulated by miRNAs.
Appendix
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Metadata
Title
Expression of miRNAs in ovine fetal gonads: potential role in gonadal differentiation
Authors
Katie J Torley
Juliano C da Silveira
Peter Smith
Russell V Anthony
DN Rao Veeramachaneni
Quinton A Winger
Gerrit J Bouma
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2011
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/1477-7827-9-2

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