We performed genetic linkage analysis in nine German proximal myotonic myop
athy (PROMM) families using DNA-markers D3S1541 and D3S1589 from the region
of the recently discovered gene locus of myotonic dystrophy type 2 (DM2) o
n chromosome 3q. Two-point analysis supplied an lod score of 5.9. We conclu
de that a gene causing PROMM is located on chromosome 3q. PROMM and DM2 may
be allelic disorders or may be caused by closely linked genes.