Abstract:
BACKGROUND:Alterations in GFER gene have been associated with progressive mitochondrial myopathy, congenital cataracts, hearing loss, developmental delay, lactic acidosis and respiratory chain deficiency in 3 siblings born to consanguineous Moroccan parents by homozygosity mapping and candidate gene approach (OMIM#613076). Next generation sequencing recently confirmed this association by the finding of compound heterozygous variants in 19-year-old girl with a strikingly similar phenotype, but this ultra-rare entity remains however unknown from most of the scientific community. MATERIALS AND METHODS:Whole exome sequencing was performed as part of a "diagnostic odyssey" for suspected mitochondrial condition in 2 patients, presenting congenital cataracts, progressive encephalomyopathy and hypotrophy and detected unreported compound heterozygous variants in GFER. RESULTS:Thanks to an international data sharing, we found 2 additional patients carrying compound heterozygous variants in GFER. Reverse phenotyping confirmed the phenotypical similarities between the 4 patients. Together with the first literature reports, the review of these 8 cases from 4 unrelated families enables us to better describe this apparently homogeneous disorder, with the clinical and biological stigmata of mitochondrial disease. CONCLUSION:This report highlights the clinical utility of whole exome sequencing and reverse phenotyping for the diagnosis of ultra-rare diseases and underlines the importance of a broad data sharing for accurate clinical delineation of previously unrecognized entities.
journal_name
Clin Genetjournal_title
Clinical geneticsauthors
Nambot S,Gavrilov D,Thevenon J,Bruel AL,Bainbridge M,Rio M,Goizet C,Rötig A,Jaeken J,Niu N,Xia F,Vital A,Houcinat N,Mochel F,Kuentz P,Lehalle D,Duffourd Y,Rivière JB,Thauvin-Robinet C,Beaudet AL,Faivre Ldoi
10.1111/cge.12985subject
Has Abstractpub_date
2017-08-01 00:00:00pages
188-198issue
2eissn
0009-9163issn
1399-0004journal_volume
92pub_type
杂志文章abstract::The advent of whole-exome next-generation sequencing (WES) has been pivotal for the molecular characterization of Mendelian disease; however, the clinical applicability of WES has remained relatively unexplored. We describe our exploration of WES as a diagnostic tool in a 3½-year old female patient with a 2-year histo...
journal_title:Clinical genetics
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doi:10.1111/j.1399-0004.1975.tb00330.x
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journal_title:Clinical genetics
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journal_title:Clinical genetics
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doi:10.1111/j.1399-0004.1981.tb00665.x
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journal_title:Clinical genetics
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