Experience of targeted Usher exome sequencing as a clinical test.
We show that massively parallel targeted sequencing of 19 genes provides a new and reliable strategy for molecular diagnosis of Usher syndrome (USH) and nonsyndromic deafness, particularly appropriate for these disorders characterized by a high clinical and genetic heterogeneity and a complex structure of several of the genes involved. A series of 71 patients including Usher patients previously screened by Sanger sequencing plus newly referred patients was studied. Ninety-eight percent of the variants previously identified by Sanger sequencing were found by next-generation sequencing (NGS). NGS proved to be efficient as it offers analysis of all relevant genes which is laborious to reach with Sanger sequencing. Among the 13 newly referred Usher patients, both mutations in the same gene were identified in 77% of cases (10 patients) and one candidate pathogenic variant in two additional patients. This work can be considered as pilot for implementing NGS for genetically heterogeneous diseases in clinical service.
U827, Inserm Montpellier, F-34000, France ; Univ, Montpellier I Montpellier, F-34000, France.
Thomas
T
Besnard
U827, Inserm Montpellier, F-34000, France ; Grupo de Investigación en Enfermedades Neurosensoriales, Instituto de Investigación Sanitaria IIS-La Fe and CIBERER Valencia, Spain.
Gema
G
García-García
Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
David
D
Baux
Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Christel
C
Vaché
Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Valérie
V
Faugère
Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Lise
L
Larrieu
Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Susana
S
Léonard
Grupo de Investigación en Enfermedades Neurosensoriales, Instituto de Investigación Sanitaria IIS-La Fe and CIBERER Valencia, Spain.
Jose M
JM
Millan
Clinical and Molecular Genetics, Institute of Child Health, University College London London, United Kingdom.
Sue
S
Malcolm
U827, Inserm Montpellier, F-34000, France ; Univ, Montpellier I Montpellier, F-34000, France ; Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Mireille
M
Claustres
U827, Inserm Montpellier, F-34000, France ; Laboratoire de Génétique Moléculaire, CHU Montpellier Montpellier, F-34000, France.
Anne-Françoise
AF
Roux
Bioinformatics; NSHL; Usher syndrome; next-generation sequencing; variant prioritization