Maternal uniparental disomy of chromosome 4 is an uniparental disomy of maternal origin that most likely does not have any phenotypic expression except from cases of homozygosity for a recessive disease mutation for which only mother is a carrier. The disease is MONDO_0019911 (maternal uniparental disomy of chromosome 4). Also known as: UPD(4)mat, maternal uniparental disomy of chromosome type 4.