Mutant DNA-binding domain of HSF4 is associated with autosomal dominant lamellar and Marner cataract

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Abstract
Congenital cataracts cause 10–30% of all blindness in children, with one-third of cases estimated to have a genetic cause1. Lamellar cataract is the most common type of infantile cataract2. We carried out whole-genome linkage analysis of Chinese individuals with lamellar cataract, and found that the disorder is associated with inheritance of a 5.11-cM locus on chromosome 16. This locus coincides with one previously described for Marner cataract3. We screened individuals of three Chinese families for mutations in HSF4 (a gene at this locus that encodes heat-shock transcription factor 4) and discovered that in each family, a distinct missense mutation, predicted to affect the DNA-binding domain of the protein, segregates with the disorder. We also discovered an association between a missense mutation and Marner cataract in an extensive Danish family. We suggest that HSF4 is critical to lens development.