A novel GCAP1(N104K) mutation in EF-hand 3 (EF3) linked to autosomal dominant cone dystrophy.

Vision Research
Li JiangWolfgang Baehr

Abstract

The GUCA1A gene encodes a guanylate cyclase activating protein (GCAP1) that is involved in regulation of phototransduction in the vertebrate retina. We discovered a novel C312A transversion in exon 2 of the human GUCA1A gene, replacing Asn-104 (N104) in GCAP1 with Lys (K), in two affected members of a family with dominant cone dystrophy. The mutation N104K is located in the third EF-hand motif (EF3) shown previously to be instrumental in converting Ca2+-free GCAP1 to a GC inhibitor in the Ca2+-bound form. In one patient, rod ERGs were fairly stable over a 12-year-period whereas 30 Hz flicker ERG and single-flash cone ERGs declined. In both patients, double-flash ERGs showed that rod recovery from an intense test flash was significantly delayed. The EC(50) for GC stimulation shifted from approximately 250 nM in wild-type GCAP1 to approximately 800 nM in the GCAP1(N104K) mutant suggesting inability of the mutant to assume an inactive form under physiological conditions. The replacement of N104 by K in GCAP1 is the first naturally occurring mutation identified in the EF3 loop. The rod recovery delays observed in double-flash ERG of affected patients suggest a novel dominant-negative effect that slows GC stimulation.

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Citations

Dec 20, 2013·Documenta Ophthalmologica. Advances in Ophthalmology·Eva NongStephen H Tsang
Sep 12, 2013·BioMed Research International·Kunka KamenarovaShomi S Bhattacharya
Nov 2, 2011·Proceedings of the National Academy of Sciences of the United States of America·Li JiangWolfgang Baehr
Mar 12, 2013·ACS Chemical Neuroscience·Karl-Wilhelm Koch, Daniele Dell'orco
Jan 12, 2011·Experimental Eye Research·Yuquan WenDavid G Birch
Feb 23, 2013·Neuroscience Letters·Li HuangQingjiong Zhang
Aug 8, 2019·Investigative Ophthalmology & Visual Science·Shuhei KameyaUNKNOWN Japan Eye Genetics Consortium
Nov 27, 2009·Molecular and Cellular Biochemistry·David M HuntMichel Michaelides

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