We report a 24 year old female with growth retardation, microcephaly, and congenital abnormalities who has an unbalanced de novo translocation between chromosomes 16 and 6: 45,XX,t(6;15)(q25;q11.2). FISH analysis confirmed that the deletion on chromosome 15 is proximal to the Prader-Willi locus. Several genes have been assigned to the 6q25-qter region including the insulin-like growth factor II/mannose-6-phosphate (IGF-II/M6P) receptor. DNA analysis from our patient documented the loss of one IGF2R gene copy. These data confirm the localisation of the IGF2R receptor to distal 6q25. We also showed reduced expression of the soluble and membrane bound IGF-II receptor, a gene dosage effect incompatible with imprinting. The IGF2R gene has been shown to be imprinted in the mouse but not in humans. Our data provide further evidence for lack of imprinting of this gene in humans.
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