We have localised a dystrophin-related autosomal gene called DMDL (Duchenne muscular dystrophy-like) to human chromosome 61q24 by in situ hybridisation. Using restriction fragment length polymorphism analysis in two mouse species, we have localised the homologous gene Dmdl in the mouse to chromosome 10 proximal to the Myb oncogene. A neuromuscular disease locus dystrophia muscularis (dy) has previously been assigned to this region of mouse chromosome 10.