In a family of Tatar ethnicity with congenital autosomal dominant zonular cataracts, a deletion of 14 nucleotides was discovered in the GJA3 gene c.del1126_1139 (p.D376Qfs*69) in the heterozygous state in three cataract patients of two generations (Figure 8). The gene discussed is GJA3; the disease is cataract.