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2016 ; 6
(ä): 23910
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Improving the management of Inherited Retinal Dystrophies by targeted sequencing
of a population-specific gene panel
#MMPMID27032803
Bravo-Gil N
; Méndez-Vidal C
; Romero-Pérez L
; González-del Pozo M
; Rodríguez-de la Rúa E
; Dopazo J
; Borrego S
; Antiñolo G
Sci Rep
2016[Apr]; 6
(ä): 23910
PMID27032803
show ga
Next-generation sequencing (NGS) has overcome important limitations to the
molecular diagnosis of Inherited Retinal Dystrophies (IRD) such as the high
clinical and genetic heterogeneity and the overlapping phenotypes. The purpose of
this study was the identification of the genetic defect in 32 Spanish families
with different forms of IRD. With that aim, we implemented a custom NGS panel
comprising 64 IRD-associated genes in our population, and three
disease-associated intronic regions. A total of 37 pathogenic mutations (14
novels) were found in 73% of IRD patients ranging from 50% for autosomal dominant
cases, 75% for syndromic cases, 83% for autosomal recessive cases, and 100% for
X-linked cases. Additionally, unexpected phenotype-genotype correlations were
found in 6 probands, which led to the refinement of their clinical diagnoses.
Furthermore, intra- and interfamilial phenotypic variability was observed in two
cases. Moreover, two cases unsuccessfully analysed by exome sequencing were
resolved by applying this panel. Our results demonstrate that this
hypothesis-free approach based on frequently mutated, population-specific loci is
highly cost-efficient for the routine diagnosis of this heterogeneous condition
and allows the unbiased analysis of a miscellaneous cohort. The molecular
information found here has aid clinical diagnosis and has improved genetic
counselling and patient management.