Identification of a novel frameshift mutation in PAX6 gene and the clinical management in an Asian Indian aniridia family

• Published in: Indian journal of ophthalmology Vol. 66; no. 2; pp. 229 - 232
• Main Authors: Palayil, Isham, Priya, S, Sivan, N, Madhivanan, Nivean, Venkatachalam, Panneer, Jagadeesan, Madhavan
• Format: Journal Article
• Language: English
• Published: India Wolters Kluwer India Pvt. Ltd 01.02.2018; Medknow Publications and Media Pvt. Ltd; Medknow Publications & Media Pvt. Ltd; Medknow Publications & Media Pvt Ltd; Wolters Kluwer Medknow Publications
• Subjects: Analysis; Aniridia; Cataracts; Chromosomes; Consent; Cornea; Frameshift mutation; Gene mutation; Genes; Genetic aspects; Genetic counseling; Genotypes; Glaucoma; Hospitals; Hypoplasia; Indians (Asian people); Management; Mutation; mutation screening; Nystagmus; Ophthalmology; Original; Patients; PAX6; Pax6 protein; Peripheral blood; Phenotypes; Physiological aspects; Polymerase chain reaction; India; mutation screening; PAX6; Aniridia
• ISSN: 0301-4738; 1998-3689; 1998-3689
• DOI: 10.4103/ijo.IJO_311_17

Purpose: This study aimed to characterize an Asian Indian aniridia family for both the phenotype and genotype of the disease for a better clinical management. Methods: The phenotype and genotype of the affected and unaffected individuals in the aniridia family were evaluated. The subjects underwent a standard ophthalmic evaluation followed by molecular screening of PAX6 gene in the peripheral blood for mutation detection. Results: The three affected individuals had aniridia with several common features and an uncommon presentation of bilateral congenital ptosis. Two affected siblings, a brother and a sister, had aniridia, nystagmus, ptosis, increase in central corneal thickness, cataract, and foveal hypoplasia. The sister had features of glaucoma. The offspring of the sister had all the features except cataract and rise in intraocular pressure. Mutation screening of PAX6 gene helped in identifying a novel heterozygous pathogenic variation g. 31801757dupG (c. 216-19dupG) that resulted in a frameshift mutation that extended into exon 7. Based on the evaluation and diagnostic testing, the family was clinically managed along with genetic counselling. Conclusion: Molecular diagnostic testing helps in genetic counseling of the family with aniridia to understand the nature of the disease and detection of complications early for better management.