Abstract
We have identified a Duchenne muscular dystrophy (DMD) pedigree with an unexpected pattern of inheritance. Using marker restriction fragment length polymorphisms detected by probes that lie within and outside the DMD gene, we could demonstrate that the maternal grandfather has transmitted two distinct types of X chromosomes to his offspring. This original observation may be explained by postulating that the DMD mutation must have occurred during mitosis in early germline proliferation, leading to a germline mosaicism within this male ancestor.
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