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A CRYGC gene mutation associated with autosomal dominant pulverulent cataract
Luz Ma González-Huerta1, Olga Messina-Baas, Héctor Urueta
1Departamento de Genética, Hospital General de México, Facultad de Medicina, Universidad Nacional Autónoma de México, D.F. México, Mexico.
Purpose:
To describe at molecular level a family with pulverulent congenital cataract associated with a CRYGC gene mutation.
Methods:
One family with several affected members with pulverulent congenital cataract and 230 healthy controls were examined. Genomic DNA from leukocytes was isolated to analyze the CRYGA-D cluster, CX46, CX50 and MIP genes through high-resolution melting curve and DNA sequencing.
Results:
DNA sequencing in the affected members revealed the c.143G>A mutation (p.R48H) in exon 2 of the CRYGC gene; 230 healthy controls and ten healthy relatives were also analyzed and none of them showed the c.143G>A mutation. No other polymorphisms or mutations were found to be present.
Conclusion:
In the present study, we described a family with pulverulent congenital cataract that segregated the c.143G>A mutation (p.R48H) in the CRYGC gene. A few mutations have been described in the CRYGC gene in autosomal dominant cataract, none of them with pulverulent cataract making clear the clinical heterogeneity of congenital cataract. This mutation has been associated with the phenotype of congenital cataract but also is considered an SNP in the NCBI data base. Our data and previous report suggest that p.R48H could be a disease-causing mutation and not an SNP.
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