AI is a generic term for an inherited group of dental diseases in which the common clinical feature is an abnormality of tooth enamel. The enamel may be thin but normal, and/or hypomineralized. CORD is a rare retinal disorder that leads to an initial loss of central vision, color vision and photophobia before the age of 10 years with subsequent night blindness and visual field restriction.
Mutations in the CNNM4 gene (2q11.2), which is implicated in metal ion transport, have been identified in several families.
