Maternal heterodisomy 15 in our proband with PWS was observed at 15q11.1–12.2 (the most distal informative marker was GABRB3), while analysis of markers mapping to more distal segments of the ...

Rio et al 9 reported segmental maternal heterodisomy for a small 11-cM region of chromosome 17q in a child with behavioral disorder, severe mental retardation and facial dysmorphism.