DESIGN: A case of Nance‐Horan syndrome in a male is presented, with some features of the condition in his carrier mother and her mother. It is proposed that Nance‐Horan syndrome might be a contiguous gene syndrome mapping to chromosome Xp21.2–p22.3.SETTING: The proband had congenital cataract micro‐phthalmia and dental abnormalities including screwdriver shaped incisors and evidence of enamet pitting hypoplasia. The region Xp2I.2–p22.3 also contains the tooth enamet protein gene, ametogenin (AMGX).RESULTS: Using molecular genetic techniques, we have shown that there is no evidence that the AMGX gene is deteted in this case of the Nance‐Hor