Résumé
A family with the segregation of retinitis pigmentosum (RP) in combination with enamel hypoplasia (amelogenesis imperfecta - AI) is recorded. Family information collected over three generations revealed expression of the condition in two of the cousins born to half sibs. Parents of both the patients are cousins and are phenotypically normal. None of the sibs and other relatives of the patients are affected with any ophthalmic condition or dental anomalies. Ophthalmic evaluation of the patients revealed retinitis pigmentosa with nystagmus and optic atrophy and dental examination showed the presence of AI with hypoplastic enamel,' severe attrition of incisors and molars with narrowing of root canal and pulp chambers. Retinitis pigmentosum is a highly heterogeneous condition with 11 genes identified for an autosomal dominant, 13 for autosomal recessive and 5 for X-linked inheritance. Amelogenesis imperfecta is also a genetically heterogeneous condition showing all the three types of segregation. To the best of our knowledge co-segregation of RP with AI has not been reported. The family reported here may be considered as a new syndrome caused by a rare autosomal recessive gene with pleitropic effect affecting the retina and as well as the normal dentition. Alternatively it could also represent a rare coincidence of the two conditions.