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The familial contribution to non-syndromic ocular coloboma in south India
S J Hornby1, L Dandona, R B Jones
1Department of Epidemiology and International Eye Health, Institute of Ophthalmology, London, UK. stella.hornby@virgin.net
Aims:
To identify the proportion of familial cases of isolated ocular colobomatous malformations in a case series from south India.
Methods:
Children with ocular coloboma without systemic features were recruited from multiple sources in Andhra Pradesh, India. Their families were traced, pedigrees drawn, and family members examined.
Results:
56 probands, 25 females (44.6%) and 31 males (57.4%) with a colobomatous malformation were identified. In 12 cases (21.4%) another family member was affected. The risk to siblings was 3.8%. The parents were consanguineous in 25 cases (44.6%).
Conclusions:
21.4% of cases of isolated ocular coloboma in this highly consanguineous population of south India were familial, with both autosomal dominant and autosomal recessive mechanisms likely in different families.
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