We have studied the inheritance of four cloned DNA sequences which recognise restriction fragment length polymorphisms on the short arm of the X chromosome in families with Becker and Duchenne muscular dystrophy. We have confirmed linkage of two probe loci to the disease loci and have combined our results with those previously published to give a maximum lod score of 11.642 at a recombination fraction of 0.15 for DXS41 (probe 99.6), and a maximum lod of 15.84 at a recombination fraction of 0.15 for DXS84 (probe 754). Linkage of these diseases to the loci defined by the pERT87 probes and probe pXJ1.1 has also been studied, giving maximum lod scores of 8.634 and 5.118 at recombination fractions of 0.02 and 0.00 respectively. The information obtained using these polymorphic DNA markers, combined with pedigree and CK data, can be used to give more accurate genetic counselling to women at risk in Becker and Duchenne families.
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