Required for meiotic chromosome segregation. It is involved in interference-sensitive crossovers (class I meiotic crossover) formation, in both male and female meiosis. Is specific to recombination events resulting in interference-sensitive crossovers (class I meiotic crossover). Not required for synapsis completion. Detected in punctuate foci onto the chromosomes in prophase I meiocytes. Short siliques and low fertility due to defect in meiosis. The predicted gene At5g48390 has been split into 2 genes: At5g48385 and At5g48390.