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Open Access Green as soon as Postprint is submitted to ZB.
De novo retinoic acid receptor beta (RARB) variant associated with microphthalmia and dystonia.
Eur. J. Med. Genet. 66:104802 (2023)
Background: Definition of the individual genotypes that cause a Mendelian phenotype is of great importance both to clinical diagnostics and disease characterization. Heterozygous de novo gain-of-function missense variants in RARB are associated with syndromic microphthalmia 12 (MCOPS12), a developmental disorder characterized by eye malformations and variable involvement of other organs. A subset of patients were described with poorly delineated movement disorders. Additionally, RARB bi-allelic loss-of-function variants, inherited from asymptomatic heterozygous carrier parents, have been found in a recessive family with four MCOPS12-affected members. Patient/methods: We used trio whole-exome sequencing to explore the molecular basis of disease in an individual with congenital eye abnormality and movement disorder. All patients with reported RARB variants were reviewed. Results: We report on identification of a heterozygous de novo RARB nonsense variant in a girl with microphthalmia and progressive generalized dystonia. Public database entries indicate that the de novo variant is recurrently present in clinically affected subjects but a literature report has not yet been available. Conclusions: We provide the first detailed evidence for a role of dominant RARB truncating alterations in congenital eye-brain disease, expanding the spectrum of MCOPS12-associated mutations. Considered together with the published family with bi-allelic variants, the data suggest manifestation and non-manifestation of disease in relation to almost identical RARB loss-of-function variations, an apparent paradox that is seen in a growing number of human genetic conditions associated with both recessive and dominant inheritance patterns.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
De Novo Variant ; Dystonia ; Loss-of-function Variant ; Microphthalmia ; Movement Disorder ; Rarb; Mutations
ISSN (print) / ISBN
1769-7212
e-ISSN
1729-7212
Quellenangaben
Volume: 66,
Issue: 8,
Article Number: 104802
Publisher
Elsevier
Publishing Place
Radarweg 29, 1043 Nx Amsterdam, Netherlands
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Neurogenomics (ING)
Grants
German Research Foundation