Craniofacial and Neurological Phenotype in a Case of Oculodentodigital Syndrome.

INTRODUCTION

Oculodentodigital syndrome (ODDS) is a rare genetic disorder caused by mutations in the gap junction GJA1 gene encoding connexin-43 (chromosome 6q22). A typical ODDS case is presented.

MATERIAL AND

METHODS

A 40-year-old male patient was examined neurologically and genetically. He had a history of recent parieto-occipital leukodystrophy, some episodes of temporary hearing loss, and characteristic facial features of ODDS. Sequencing of the GJA1 gene was performed in patient's total genomic DNA sample isolated from peripheral blood cells.

RESULTS

A novel heterozygous missense mutation (443G>A) was identified in the GJA1 gene, resulting in coding for a different amino acid (Arg148Gln).

CONCLUSION

The molecular genetic analysis confirmed the diagnosis of ODDS. The novel mutation, located within a calmodulin binding region of connexin-43, probably affects proper channel function.