RGD uses the Human Disease Ontology (DO, https://disease-ontology.org/) for disease curation across species. RGD automatically downloads each new release of the ontology on a monthly basis. Some additional terms which are required for RGD's curation purposes but are not currently covered in the official version of DO have been added. As corresponding terms are added to DO, these custom terms are retired and the DO terms substituted in existing annotations and subsequently used for curation.
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. Recurrent hydatidiform mole-3 (HYDM3) is caused by homozygous or compound heterozygous mutation in the MEI1 gene on chromosome 22q13. (OMIM)