“…Among the 10 cases of maternal UPD(3) with an abnormal phenotype, 6 had clear clinical phenotypes associated with chromosomal recessive disorders, 2 had abnormal chromosome karyotype, 1 had mosaic UPD, and detailed information was not available for 1 case. Among these six cases, the phenotypes included epidermolysis bullosa ( COL7A1 ) [ 9 , 10 ], Fanconi Bickel syndrome ( GLUT2 ) [ 11 ], a congenital disorder of glycosylation type Id ( ALG3 ) [ 12 ], GM1 gangliosidosis ( GLB1 ) [ 13 ], and woolly hair/hypotrichosis ( LIPH ) [ 14 ]. Among the five reported cases of paternal UPD(3), three had a definite phenotype caused by single-gene disorders, one had no apparent disease phenotype, and one presented an abnormal karyotype.…”