Aetiology of congenital and paediatric cataract in an Australian population

• Published in: British journal of ophthalmology Vol. 86; no. 7; pp. 782 - 786
• Main Authors: Wirth, M G, Russell-Eggitt, I M, Craig, J E, Elder, J E, Mackey, D A
• Format: Journal Article
• Language: English
• Published: BMA House, Tavistock Square, London, WC1H 9JR BMJ Publishing Group Ltd 01.07.2002; BMJ; BMJ Publishing Group LTD; Copyright 2002 British Journal of Ophthalmology
• Subjects: Adults; Amino acids; Australia - epidemiology; Biological and medical sciences; Cataract; Cataract - congenital; Cataract - epidemiology; Cataract - genetics; Cataracts; Causes and theories of causation; Child; Child, Preschool; Children & youth; Chromosomes; Clinical Science; congenital cataracts; Diseases; Eye diseases; Families & family life; Genes; Genes, Dominant; Genes, Recessive; Genetic aspects; hereditary cataracts; Humans; Incidence; Infant; Infant, Newborn; Intellectual disabilities; Lens diseases; Medical Records, Problem-Oriented; Medical sciences; Mutation; Ophthalmology; paediatric cataracts; Pedigree; Surgery (general aspects). Transplantations, organ and tissue grafts. Graft diseases; Surgery of the eye and orbit; Urine; X Chromosome; Australia; Oceania; United Kingdom; Human; Symptomatology; Eye disease; Cataract; Lens disease; Newborn; Congenital; Transmission mode; Genetic determinism; Public health; Anterior segment disease; Incidence
• ISSN: 0007-1161; 1468-2079
• DOI: 10.1136/bjo.86.7.782

Background/aim: Paediatric cataract is a major cause of childhood blindness. Several genes associated with congenital and paediatric cataracts have been identified. The aim was to determine the incidence of cataract in a population, the proportion of hereditary cataracts, the mode of inheritance, and the clinical presentation. Methods: The Royal Children's Hospital and the Royal Victorian Eye and Ear Hospital have a referral base for almost all paediatric patients with cataracts in south eastern Australia. The database contains cases seen over the past 25 years. The medical histories of these patients were reviewed. Results: 421 patients with paediatric cataract were identified, which gives an estimated incidence of 2.2 per 10 000 births. Of the 342 affected individuals with a negative family history, 50% were diagnosed during the first year of life, and 56/342 (16%) were associated with a recognised systemic disease or syndrome. Unilateral cataract was identified in 178/342 (52%) of sporadic cases. 79 children (from 54 nuclear families) had a positive family history. Of these 54 families, 45 were recruited for clinical examination and DNA collection. Ten nuclear families were subsequently found to be related, resulting in four larger pedigrees. Thus, 39 families have been studied. The mode of inheritance was autosomal dominant in 30 families, X linked in four, autosomal recessive in two, and uncertain in three. In total, 178 affected family members were examined; of these 8% presented with unilateral cataracts and 43% were diagnosed within the first year of life. Conclusions: In the paediatric cataract population examined, approximately half of the patients were diagnosed in the first year of life. More than 18% had a positive family history of cataracts. Of patients with hereditary cataracts 8% presented with unilateral involvement. Identification of the genes that cause paediatric and congenital cataract should help clarify the aetiology of some sporadic and unilateral cataracts.