Decoding the RNA Regulatory Network in Medaka (Oryzias latipes) Spermatogenesis: Insights from a Germ Cell...

Area of Science:

• Reproductive Biology
• Molecular Genetics
• Developmental Biology

Background:

• Spermatogenesis involves complex interactions between germ cells and somatic cells.
• Circular RNAs (circRNAs) participate in post-transcriptional regulation via competitive endogenous RNA (ceRNA) networks.
• The role of ceRNA networks in germ cell-intrinsic spermatogenesis regulation is largely unknown.

Purpose of the Study:

• To investigate the function of ceRNA networks in germ cell-intrinsic spermatogenesis.
• To identify key circRNAs, microRNAs (miRNAs), and messenger RNAs (mRNAs) involved in spermatogenesis regulation.
• To construct a ceRNA network regulating spermatogenesis initiation.

Main Methods:

• Utilized a *foxl3* mutant medaka model where XX female germ cells transdifferentiate into sperm.
• Performed whole-transcriptome sequencing to identify circRNAs, miRNAs, and mRNAs.
• Employed bioinformatic analysis to construct a candidate ceRNA regulatory network.

Main Results:

• Identified 58 key circRNAs, 27 core miRNAs, and 2965 mRNAs.
• Constructed a candidate ceRNA network involving six circRNAs.
• Elucidated a ceRNA network crucial for germ cell-dominant spermatogenesis initiation.

Conclusions:

• A germ cell-intrinsic ceRNA network plays a vital role in initiating spermatogenesis.
• These findings provide insights into teleost spermatogenesis regulation.
• Identified potential molecular targets for reproductive medicine and aquaculture.