A null mutation in CABP4 causes Leber's congenital amaurosis-like phenotype.
OBJECTIVE
To describe the finding of a novel calcium binding protein 4 (CABP4) mutation in a family with Leber congenital amaurosis (LCA) phenotype.


METHODS
Homozygosity mapping was performed in a consanguineous family with four affected members originally referred as cases of LCA. Detailed electroretinographic recordings were obtained.


RESULTS
A novel homozygous single base-pair insertion was identified in all four siblings. The patients had an LCA-like phenotype, including either flat or greatly diminished electroretinographic activity.


CONCLUSIONS
This report significantly expands on the phenotype associated with calcium binding protein 4 mutations, which has so far been limited to congenital stationary night blindness, and further demonstrates how molecular data often blur the boundaries between what are believed to be clinically distinct retinal disorders.
Aldahmesh
Mohammed A
MA
Department of Genetics, King Faisal Specialist Hospital and Research Center, Riyadh 11211, Saudi Arabia.
Al-Owain
Mohammed
M
Alqahtani
Faisal
F
Hazzaa
Salwa
S
Alkuraya
Fowzan S
FS
D000293:Adolescent; D001483:Base Sequence; D001766:Blindness / Q000150:complications / Q000151:congenital* / Q000235:genetics* / Q000473:pathology; D002135:Calcium-Binding Proteins / Q000235:genetics*; D002648:Child; D004252:DNA Mutational Analysis; D005190:Family; D005260:Female; D056726:Genetic Association Studies; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation / Q000235:genetics*; D029242:Optic Atrophy, Hereditary, Leber / Q000150:complications / Q000235:genetics* / Q000473:pathology*; D010375:Pedigree; D010641:Phenotype
C514441:CABP4 protein, human; D002135:Calcium-Binding Proteins