Autosomal dominant congenital stationary night blindness (adCSNB) is rare and results from altered phototransduction giving a\nRiggs type of electroretinogram (ERG) with loss of the rod a-wave and small b-waves. These patients usually have normal vision\nin light. Only few mutations in genes coding for proteins of the phototransduction cascade lead to this condition; most of these\ngene defects cause progressive rod-cone dystrophy. Mutation analysis of an adCSNB family with a Riggs-type ERG revealed a\nnovel variant (c.155T>A p.Ile52Asn) in GNAT1 coding for the
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