YTHDC2 serves a distinct late role in spermatocytes during germ cell differentiation

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Posttranscriptional regulation by RNA-binding proteins fine-tunes gene expression.
• The RNA helicase YTHDC2 (YTH domain-containing protein 2) is known to regulate the transition from mitosis to meiosis in mouse germ cells.

Purpose of the Study:

• To investigate the role of YTHDC2 in later stages of spermatogenesis.
• To understand the molecular mechanisms by which YTHDC2 promotes meiotic progression.

Main Methods:

• Conditional knockout of the Ythdc2 gene in mouse spermatocytes.
• Analysis of gene expression and meiotic progression in YTHDC2-deficient cells.
• Coimmunoprecipitation to identify YTHDC2 interacting proteins.

Main Results:

• YTHDC2-deficient germ cells progressed to the pachytene stage but failed to transition to diplotene and underwent apoptosis.
• Mis-expression of numerous genes was observed in YTHDC2-deficient spermatocytes.
• YTHDC2 was found to interact with other RNA-binding proteins, including MEIOC, often localized in RNA granules.

Conclusions:

• YTHDC2 plays a critical role in promoting meiotic progression beyond the pachytene stage in male germ cells.
• YTHDC2 collaborates with RNA granule components to regulate RNA posttranscriptionally, ensuring proper meiotic progression.