Phenotypic and genetic spectrum of Danish patients with ABCA4-related retinopathy.
BACKGROUND
Pathogenic variations in the ABCA4 gene were originally recognized as genetic background for the autosomal recessive disorders Stargardt disease and fundus flavimaculatus, but have expanded to embrace a diversity of retinal diseases, giving rise to the new diagnostic term, ABCA4-related retinopathy. Diagnostic genotyping of ABCA4 is complicated by the large size of the gene and the existence of approximately 600 known pathogenic variations, along with numerous rare polymorphisms. A commercial diagnostic array-based assay has been developed targeting known mutations, however a conclusive genetic diagnosis must rely on a comprehensive genetic screening as the mutation spectrum of ABCA4-related retinopathies continues to expand.


METHODS
Among 161 patients with a Stargardt-related phenotype previously assessed with the commercial ABCA4 mutation microarray, we analyzed the ABCA4 gene with High-resolution melting (HRM) in patients in whom the array analysis identified either a heterozygous mutation (n = 50) or no mutation (n = 30).


RESULTS
The HRM method detected each of the already known mutations and polymorphisms. We identified the second ABCA4 mutation in 31 of 50 heterozygous patients (62%). Several novel mutations were identified of which four were identified multiple times. The recurrent novel mutations were subsequently assessed among the 30 patients with possible ABCA4-related diseases, previously found to be negative for known ABCA4 mutations by array analysis. In total, 30 different mutations were identified of which 21 have not been described before.


CONCLUSIONS
Scandinavian patients with ABCA4-related retinopathy appear to have a distinct mutation spectrum, which can be identified in patients of diverse clinical phenotypes.
Department of Clinical Genetics, Rigshospitalet, Copenhagen University Hospital, Denmark. morten.dunoe@rh.regionh.dk
Morten
M
Duno
Marianne
M
Schwartz
Pernille L
PL
Larsen
Thomas
T
Rosenberg
D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D004252:DNA Mutational Analysis; D003718:Denmark; D004596:Electroretinography; D056726:Genetic Association Studies; D060005:Genotyping Techniques; D006801:Humans; D009154:Mutation; D020411:Oligonucleotide Array Sequence Analysis; D016133:Polymerase Chain Reaction; D012164:Retinal Diseases / Q000175:diagnosis / Q000235:genetics*
C056475:ABCA4 protein, human; D018528:ATP-Binding Cassette Transporters