Hydatidiform mole is a human pregnancy with abnormal or no embryonic development and excessive trophoblastic proliferation. Partial hydatidiform moles have a triploid dispermic genome, with 2 sets of paternal chromosomes and 1 set of maternal chromosomes; complete hydatidiform moles have a diploid androgenetic genome with all chromosomes originating from 1 (monospermic) or 2 (dispermic) sperms, and no maternal chromosomes (summary by Nguyen et al., 2018).
For a discussion of genetic heterogeneity of recurrent hydatidiform mole, see HYDM1 (231090). [from
OMIM]