Five generations of a family with autosomal-dominant cone-rod dystrophy (CRD) with complete penetrance have been previously studied extensively clinically. The young members of this family were reevaluated, and blood from 73 available family members was studied with 17 biochemical and serological markers. A total of 25 relatives was found to be affected. Linkage between the gene for CRD in this family and the markers studied could not be established by maximum likelihood analysis.
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