<i>CRB1</i>-Related Retinal Dystrophies in a Cohort of 50 Patients: A Reappraisal in the Light of Specific Müller Cell and Photoreceptor <i>CRB1</i> Isoforms

<i>CRB1</i>-Related Retinal Dystrophies in a Cohort of 50 Patients: A Reappraisal in the Light of Specific Müller Cell and Photoreceptor <i>CRB1</i> Isoforms

Pathogenic variants in <i>CRB1</i> lead to diverse recessive retinal disorders from severe Leber congenital amaurosis to isolated macular dystrophy. Until recently, no clear phenotype-genotype correlation and no appropriate mouse models existed. Herein, we reappraise the phenotype-genoty...

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Bibliographic Details
Main Authors: Kévin Mairot, Vasily Smirnov, Béatrice Bocquet, Gilles Labesse, Carl Arndt, Sabine Defoort-Dhellemmes, Xavier Zanlonghi, Dalil Hamroun, Danièle Denis, Marie-Christine Picot, Thierry David, Olivier Grunewald, Mako Pégart, Hélèna Huguet, Anne-Françoise Roux, Vasiliki Kalatzis, Claire-Marie Dhaenens, Isabelle Meunier
Format: Article
Language:English
Published: MDPI AG 2021-11-01
Series:International Journal of Molecular Sciences
Subjects:
<i>CRB1</i>
isoforms
early onset retinal dystrophy
Leber congenital amaurosis
macular dystrophy
Müller cells
Online Access:https://www.mdpi.com/1422-0067/22/23/12642
Description
Summary:Pathogenic variants in <i>CRB1</i> lead to diverse recessive retinal disorders from severe Leber congenital amaurosis to isolated macular dystrophy. Until recently, no clear phenotype-genotype correlation and no appropriate mouse models existed. Herein, we reappraise the phenotype-genotype correlation of 50 patients with regards to the recently identified <i>CRB1</i> isoforms: a canonical long isoform A localized in Müller cells (12 exons) and a short isoform B predominant in photoreceptors (7 exons). Twenty-eight patients with early onset retinal dystrophy (EORD) consistently had a severe Müller impairment, with variable impact on the photoreceptors, regardless of isoform B expression. Among them, two patients expressing wild type isoform B carried one variant in exon 12, which specifically damaged intracellular protein interactions in Müller cells. Thirteen retinitis pigmentosa patients had mainly missense variants in laminin G-like domains and expressed at least 50% of isoform A. Eight patients with the c.498_506del variant had macular dystrophy. In one family homozygous for the c.1562C>T variant, the brother had EORD and the sister macular dystrophy. In contrast with the mouse model, these data highlight the key role of Müller cells in the severity of <i>CRB1</i>-related dystrophies in humans, which should be taken into consideration for future clinical trials.
ISSN:1661-6596
1422-0067

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