Essential component of the RMI complex, a complex that plays an important role in the resolution step of homologous recombination, in a process called Holliday Junction dissolution, to limit DNA crossover formation in cells. Together with TOP3A, is essential for the resolution of meiotic recombination intermediates, a step that prevents entanglement of the parental chromosomes. Component of the RMI complex, containing at least TOP3A and RMI1. The RMI complex interacts with RECQL4A (By similarity). A number of isoforms are produced. According to EST sequences. sterile due to extensive chromosome breakage in meiosis I. Belongs to the RMI1 family.