AIM:To map the causal gene of congenital nuclear cataract in a family in the area of northeast.METHODS:We investigated there generations of a Chinese family affected with hereditary cataract.Peripheral blood samples were collected from all of the family members,and genomic DNA was then extracted from the blood samples.Linkage analysis was performed using 62microsatellite markers.Two-point LOD scores(Z) were calculated using the LINKAGE programs(ver.5.2).Haplotypes were constructed according to the allele in...