Abstract
Facioscapulohumeral muscular dystrophy is an important autosomal dominant neuromuscular disorder that has been localised to 4q35. We have analysed our extensive panel of 45 families with a new DNA marker p13E-11. The findings, based on multiply informative individual meioses and multipoint mapping, suggest that probe p13E-11 is the closest marker for the disorder and it is likely to be located proximal to the disease locus as are all the other present markers. In nine of the ten new mutations studied, a new smaller EcoRI fragment which was not present in either of the parents was detected, indicating that a de novo DNA rearrangement is indeed associated with the development of the disease state. However, in view of the difficulty in defining the size of over 30kb alleles and the recombinant events observed with p13E-11, we suggest that it should be used in combination with another VNTR marker until a close distal flanking marker for this condition is identified or the gene itself is isolated.
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