A stress-dependent postembryonic role for the core CPA factor CFIM-1 in germline integrity

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• Alternative polyadenylation (APA) generates diverse 3' untranslated region (3'UTR) transcript isoforms, impacting gene function and stability.
• Dysregulation of APA is linked to various diseases, including cancer and neurodevelopmental disorders.
• The developmental roles of core cleavage and polyadenylation (CPA) factors mediating APA are not well understood.

Purpose of the Study:

• To investigate the role of the core CPA factor CFIM-1 in post-embryonic development.
• To characterize the function of CFIM-1 in Caenorhabditis elegans germline integrity.

Main Methods:

• Generated a total loss-of-function mutant for cfim-1 in C. elegans.
• Assessed the fertility and germline morphology of cfim-1 loss-of-function mutants at different temperatures.
• Performed transcriptome analysis to identify genes with altered transcript isoform abundance.

Main Results:

• Loss-of-function of cfim-1 results in temperature-sensitive sterility in hermaphrodites.
• CFIM-1 protein levels remain constant regardless of temperature.
• Sterility is associated with defects in sperm, oocyte, and germline morphology.
• Transcriptome analysis revealed altered isoform abundance in genes crucial for reproductive structure development.

Conclusions:

• CFIM-1 plays a critical, stress-dependent role in maintaining germline integrity and reproductive development in C. elegans.
• This study highlights a previously uncharacterized post-embryonic function for a core CPA factor in tissue-specific development.