MICHAUD, Vincent; SEQUEIRA, Angèle; MERCIER, Elina; LASSEAUX, Eulalie; PLAISANT, Claudio; HADJ-RABIA, Smail; WHALEN, Sandra; BONNEAU, Dominique; DIEUX COESLIER, Anne; MORICE-PICARD, Fanny; COURSIMAULT, Juliette; ARVEILER, Benoit; JAVERZAT, Sophie

doi:10.1111/pcmr.13123

MICHAUD, Vincent
Laboratoire Maladies Rares: Génétique et Métabolisme (Bordeaux) [U1211 INSERM/MRGM]

SEQUEIRA, Angèle
Laboratoire Maladies Rares: Génétique et Métabolisme (Bordeaux) [U1211 INSERM/MRGM]

MERCIER, Elina
Laboratoire Maladies Rares: Génétique et Métabolisme (Bordeaux) [U1211 INSERM/MRGM]

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Pigment Cell & Melanoma research. 2023-08-31

Résumé en anglais

Oculocutaneous albinism type 2 (OCA2) is the second most frequent form of albinism and represents about 30% of OCA worldwide. As with all types of OCA, patients present with hypopigmentation of hair and skin, as well as severe visual abnormalities. We focused on a subgroup of 29 patients for whom genetic diagnosis was pending because at least one of their identified variants in or around exon 10 of OCA2 is of uncertain significance (VUS). By minigene assay, we investigated the effect of these VUS on exon 10 skipping and showed that not only intronic but also some synonymous variants can result in enhanced exon skipping. We further found that excessive skipping of exon 10 could be detected directly on blood samples of patients and of their one parent with the causal variant, avoiding invasive skin biopsies. Moreover, we show that variants, which result in lack of detectable OCA2 mRNA can be identified from blood samples as well, as shown for the most common OCA2 pathogenic missense variant c.1327G>A/p.(Val443Ile). In conclusion, blood cell RNA analysis allows testing the potential effect of any OCA2 VUS on transcription products. This should help to elucidate yet unsolved OCA2 patients and improve genetic counseling.< Réduire

Mots clés en anglais

Albinism

diagnosis

Exon skipping

mRNA

Noninvasive

OCA2

Variant of unknown significance

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https://oskar-bordeaux.fr/handle/20.500.12278/188192

DOI

http://dx.doi.org/10.1111/pcmr.13123

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Maladies Rares : Génétique et Métabolisme (MRGM) - UMR 1211

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Unsuspected consequences of synonymous and missense variants in OCA2 can be detected in blood cell RNA samples of patients with albinism.

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