Exome sequencing extends the phenotypic spectrum for ABHD12 mutations: from syndromic to nonsyndromic retinal degeneration

Nishiguchi, Koji M. and Avila-Fernandez, Almudena and van Huet, Ramon A. C. and Corton, Marta and Pérez-Carro, Raquel and Martín-Garrido, Esther and López-Molina, María Isabel and Blanco-Kelly, Fiona and Hoefsloot, Lies H. and van Zelst-Stams, Wendy A. and García-Ruiz, Pedro J. and Del Val, Javier and Di Gioia, Silvio Alessandro and Klevering, B. Jeroen and van de Warrenburg, Bart P. C. and Vazquez, Carlos and Cremers, Frans P. M. and García-Sandoval, Blanca and Hoyng, Carel B. and Collin, Rob W. J. and Rivolta, Carlo and Ayuso, Carmen. (2014) Exome sequencing extends the phenotypic spectrum for ABHD12 mutations: from syndromic to nonsyndromic retinal degeneration. Ophthalmology, 121 (8). pp. 1620-1627.

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Official URL: https://edoc.unibas.ch/82121/

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To identify the genetic causes underlying autosomal recessive retinitis pigmentosa (arRP) and to describe the associated phenotype.; Case series.; Three hundred forty-seven unrelated families affected by arRP and 33 unrelated families affected by retinitis pigmentosa (RP) plus noncongenital and progressive hearing loss, ataxia, or both, respectively.; A whole exome sequencing (WES) analysis was performed in 2 families segregating arRP. A mutational screening was performed in 378 additional unrelated families for the exon-intron boundaries of the ABHD12 gene. To establish a genotype-phenotype correlation, individuals who were homozygous or compound heterozygotes of mutations in ABHD12 underwent exhaustive clinical examinations by ophthalmologists, neurologists, and otologists.; DNA sequence variants, best-corrected visual acuity, visual field assessments, electroretinogram responses, magnetic resonance imaging, and audiography.; After a WES analysis, we identified 4 new mutations (p.Arg107Glufs*8, p.Trp159*, p.Arg186Pro, and p.Thr202Ile) in ABHD12 in 2 families (RP-1292 and W08-1833) previously diagnosed with nonsyndromic arRP, which cosegregated with the disease among the family members. Another homozygous mutation (p.His372Gln) was detected in 1 affected individual (RP-1487) from a cohort of 378 unrelated arRP and syndromic RP patients. After exhaustive clinical examinations by neurologists and otologists, the 4 affected members of the RP-1292 had no polyneuropathy or ataxia, and the sensorineural hearing loss and cataract were attributed to age or the normal course of the RP, whereas the affected members of the families W08-1833 and RP-1487 showed clearly symptoms associated with polyneuropathy, hearing loss, cerebellar ataxia, RP, and early-onset cataract (PHARC) syndrome.; Null mutations in the ABHD12 gene lead to PHARC syndrome, a neurodegenerative disease including polyneuropathy, hearing loss, cerebellar ataxia, RP, and early-onset cataract. Our study allowed us to report 5 new mutations in ABHD12. This is the first time missense mutations have been described for this gene. Furthermore, these findings are expanding the spectrum of phenotypes associated with ABHD12 mutations ranging from PHARC syndrome to a nonsyndromic form of retinal degeneration.
Faculties and Departments:03 Faculty of Medicine
09 Associated Institutions > Institute of Molecular and Clinical Ophthalmology Basel (IOB)
UniBasel Contributors:Rivolta, Carlo
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:12 Apr 2021 10:50
Deposited On:12 Apr 2021 10:50

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