Case of the month: Germline mosaicism in carriers of duchenne muscular dystrophy

Abstract
Carrier testing in a Duchenne muscular dystrophy (DMD) family resulted in the identification of a case of germline mosaicism. Using dystrophin cDNA probes, this phenomenon was ascertained by the demonstration of a deletion junction fragment present in the DNA of the affected patient and one sister but absent in the mother's DNA. As a result of this finding carrier risk estimations, based on restriction fragment length polymorphism (RFLP) of cDNA deletion carrier testing and the counseling implications of germline mosaicism. © 1992 John Wiley & Sons, Inc.