Journal Article

The genetic profile of Leber congenital amaurosis in an Australian cohort

Campbell, Isabella R., De Roach, John N., Lamey, Tina M., Chen, Fred K., McLaren, Terri L., Hoffmann, Ling H., Mackey, David A., Thompson, Jennifer A., Montgomery, Hannah E.

2017

Overview

Background Leber congenital amaurosis (LCA) is a severe visual impairment responsible for infantile blindness, representing ~5% of all inherited retinal dystrophies. LCA encompasses a group of heterogeneous disorders, with 24 genes currently implicated in pathogenesis. Such clinical and genetic heterogeneity poses great challenges for treatment, with personalized therapies anticipated to be the best treatment candidates. Unraveling the individual genetic etiology of disease is a prerequisite for personalized therapies, and could identify potential treatment candidates, inform patient management, and discriminate syndromic forms of disease. Methods We have genetically analyzed 45 affected and 82 unaffected individuals from 34 unrelated LCA pedigrees using predominantly next‐generation sequencing and Array CGH technology. Results We present the molecular findings for an Australian LCA cohort, sourced from the Australian Inherited Retinal Disease Registry & DNA Bank. CEP290 and GUCY2D mutations, each represent 19% of unrelated LCA cases, followed by NMNAT1 (12%). Genetic subtypes were consistent with other reports, and were resolved in 90% of this cohort. Conclusion The high resolution rate achieved, equivalent to recent findings using whole exome/genome sequencing, reflects the progression from hypothesis (LCA Panel) to non‐hypothesis (RD Panel) testing and, coupled with Array CGH analysis, is a highly effective first‐tier test for LCA. Leber congenital amaurosis (LCA) is a severe visual impairment responsible for infantile blindness, representing ~5% of all inherited retinal dystrophies. We present the molecular findings for an Australian LCA cohort, sourced from the Australian Inherited Retinal Disease Registry & DNA Bank, which utilized next‐generation sequencing and Array CGH to resolve 90% of this cohort. The high resolution rate achieved, equivalent to recent findings using whole exome/genome sequencing, reflects the progression from hypothesis (LCA Panel) to non‐hypothesis (RD Panel) testing and, coupled with Array CGH analysis, is a highly effective first‐tier test for LCA.

• Publisher: John Wiley & Sons, Inc,John Wiley and Sons Inc
• Subject: Antigens, Neoplasm - genetics / Australia - epidemiology / Blindness / Cell Cycle Proteins / Cohort Studies / Congenital diseases / Cytoskeletal Proteins / Databases, Genetic / Deoxyribonucleic acid / Disease control / DNA / DNA Mutational Analysis / Etiology / Eye Proteins - genetics / Gene sequencing / Genetic variants / Genomes / Guanylate Cyclase - genetics / Guanylate cyclase 1 / Heterogeneity / Heterozygote / High-Throughput Nucleotide Sequencing / Homozygote / Humans / Hypotheses / inherited retinal dystrophies / Leber congenital amaurosis / Leber Congenital Amaurosis - diagnosis / Leber Congenital Amaurosis - epidemiology / Leber Congenital Amaurosis - genetics / Microtubule-Associated Proteins - genetics / Mutation / Neoplasm Proteins - genetics / next‐generation sequencing / Nicotinamide-Nucleotide Adenylyltransferase - genetics / Original / Pathogenesis / Pedigree / People with disabilities / personalized therapies / Phenotype / Prevalence / Receptors, Cell Surface - genetics / Retina / retinal disease / Therapeutic applications