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DNAJC30 disease-causing gene variants in a large Central European cohort of patients with suspected Leber’s hereditary optic neuropathy and optic atrophy

BACKGROUND: Leber’s hereditary optic neuropathy (LHON) has been considered a prototypical mitochondriopathy and a textbook example for maternal inheritance linked to certain disease-causing variants in the mitochondrial genome. Recently, an autosomal recessive form of LHON (arLHON) has been describe...

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Detalles Bibliográficos
Autores principales: Kieninger, Sinja, Xiao, Ting, Weisschuh, Nicole, Kohl, Susanne, Rüther, Klaus, Kroisel, Peter Michael, Brockmann, Tobias, Knappe, Steffi, Kellner, Ulrich, Lagrèze, Wolf, Mazzola, Pascale, Haack, Tobias B, Wissinger, Bernd, Tonagel, Felix
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BMJ Publishing Group 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9554085/
https://www.ncbi.nlm.nih.gov/pubmed/35091433
http://dx.doi.org/10.1136/jmedgenet-2021-108235
Descripción
Sumario:BACKGROUND: Leber’s hereditary optic neuropathy (LHON) has been considered a prototypical mitochondriopathy and a textbook example for maternal inheritance linked to certain disease-causing variants in the mitochondrial genome. Recently, an autosomal recessive form of LHON (arLHON) has been described, caused by disease-causing variants in the nuclear encoded gene DNAJC30. METHODS AND RESULTS: In this study, we screened the DNAJC30 gene in a large Central European cohort of patients with a clinical diagnosis of LHON or other autosomal inherited optic atrophies (OA). We identified likely pathogenic variants in 35/1202 patients, corresponding to a detection rate of 2.9%. The previously described missense variant c.152A>G;p.(Tyr51Cys) accounts for 90% of disease-associated alleles in our cohort and we confirmed a strong founder effect. Furthermore, we identified two novel pathogenic variants in DNAJC30: the nonsense variant c.610G>T;p.(Glu204*) and the in-frame deletion c.230_232del;p.(His77del). Clinical investigation of the patients with arLHON revealed a younger age of onset, a more frequent bilateral onset and an increased clinically relevant recovery compared with LHON associated with disease-causing variants in the mitochondrial DNA. CONCLUSION: This study expands previous findings on arLHON and emphasises the importance of DNAJC30 in the genetic diagnostics of LHON and OA in European patients.