Confirmation of linkage of Duane's syndrome and refinement of the disease locus to an 8.8-cM interval on chromosome 2q31

Duane's syndrome is a congenital abnormality of eye movement, which may be inherited as an autosomal dominant trait but usually occurs sporadically. G enetic mapping in a Mexican family has recently identified a locus for Duan e's syndrome within a 17.8-cM region of chromosome 2q31. The region was fla nked by the microsatellite markers D2S2330 and D2S364. We performed linkage and haplotype analysis in a four-generation UK family with autosomal domin ant transmission of Duane's syndrome. Linkage to 2q31 was confirmed with a maximum logarithm of differences (lod) score of 3.3 at theta=0. The genetic interval was reduced to an 8.8-cM region between markers D2S326 and D2S364 that includes the candidate homeobox D gene cluster.