Mcm8, or Minichromosome Maintenance 8 Homologous Recombination Repair Factor, is a helicase involved in multiple DNA-related processes. It plays a crucial role in DNA replication (initiation), meiosis, homologous recombination, and mismatch repair. Mcm8 is also associated with pathways like mitophagy and R-loop resolution, which are essential for maintaining genome stability and cell function [3].

Disabling Mcm8 in mice led to proliferation defects of primordial germ cells (PGCs) and ultimately impaired fertility. This indicates its significance in PGC development and reproductive reserve establishment. Loss of Mcm8 also led to R-loop accumulation by reducing the retention of helicases DDX5 and DHX9 at R-loops, thus inducing genome instability [1]. In a mouse model of Kawasaki disease, Mcm8-deficient mice developed more severe coronary artery vasculopathy, suggesting its role in protecting vascular health [2].

In conclusion, Mcm8 is essential for maintaining genome integrity, with key functions in PGC development and vascular health as revealed by mouse models. Its role in R-loop resolution and mitophagy provides insights into the molecular mechanisms underlying reproductive aging and Kawasaki disease, highlighting its potential as a therapeutic target in these disease areas.