DNA polymorphism of the RC8 probe on the X-chromosome. Identification of a new DNA variant with the TaqI enzyme.

Restriction fragment length polymorphisms detectable with the RC8 probe, a probe for an area located on the short arm of the X-chromosome, and loosely linked to the locus for Duchenne muscular dystrophy, have been studied in a Norwegian population. With the TaqI enzyme three variants were observed. The gene frequencies of the previously detected variants were 0.867 and 0.082, respectively, and the frequency of a new variant was 0.051. Family studies confirmed Mendelian inheritance of the variants.