Functional constraints of wtf killer meiotic drivers

Area of Science:

• Molecular Biology
• Genetics
• Evolutionary Biology

Background:

• Killer meiotic drivers are selfish genetic elements that reduce the transmission of non-driver alleles.
• These drivers often utilize toxic proteins to eliminate competing gametes.
• Understanding driver mechanisms can illuminate infertility causes and essential cellular functions.

Purpose of the Study:

• To investigate the molecular mechanisms of the wtf family of killer meiotic drivers in fission yeast.
• To explore the role of protein self-assembly and antidote neutralization in driver toxicity.
• To understand evolutionary constraints on killer meiotic driver alleles.

Main Methods:

• Analysis of wtf gene family conservation and diversity.
• Investigation of Wtf^poison protein self-assembly and its correlation with toxicity.
• Engineering of wtf alleles to study poison-antidote interactions and self-destructive potential.

Main Results:

• Self-assembly of Wtf^poison proteins is broadly conserved and linked to toxicity, despite low amino acid sequence conservation.
• Toxicity is modulated by assembly size, and effective neutralization requires specific Wtf^poison and Wtf^antidote co-assembly.
• Engineered self-destructive alleles demonstrate functional constraints on wtf evolution.

Conclusions:

• Wtf^poison self-assembly is a conserved mechanism driving toxicity in killer meiotic drivers.
• Specific co-assembly of poison and antidote proteins is crucial for effective neutralization.
• Self-destructive killer meiotic driver alleles may contribute to infertility in natural populations and other lineages.