The RNA-binding protein FUS/TLS interacts with SPO11 and PRDM9 and localize at meiotic recombination hotspots

Area of Science:

• Genetics
• Molecular Biology
• Cell Biology

Background:

• Meiotic recombination initiates DNA double-strand breaks (DSBs) at specific genomic hotspots.
• PRDM9, a histone methyltransferase, defines these hotspots by depositing H3K4me3 and H3K36me3 marks.
• Dysregulation of PRDM9 activity leads to meiotic failure and infertility.

Purpose of the Study:

• To investigate the role of FET proteins, specifically FUS/TLS, in regulating PRDM9 activity and meiotic recombination.
• To determine if FUS/TLS interacts with key proteins involved in DSB formation, such as PRDM9 and REC114.

Main Methods:

• Co-immunoprecipitation assays to assess protein-protein interactions.
• Immunofluorescence microscopy to visualize protein localization on meiotic chromosomes.
• Chromatin immunoprecipitation (ChIP) to map FUS/TLS binding sites.

Main Results:

• FUS/TLS partially colocalizes with PRDM9 on meiotic chromosome axes and physically interacts with it.
• FUS/TLS also interacts with REC114, an essential factor for DSB formation.
• FUS/TLS co-immunoprecipitates with SPO11 and localizes to H3K4me3-marked recombination hotspots.

Conclusions:

• FUS/TLS is a component of the protein complex that initiates meiotic recombination.
• FUS/TLS likely guides PRDM9 activity and SPO11-mediated DSB formation at recombination hotspots.
• These findings elucidate a novel regulatory mechanism in mammalian meiosis.