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GNB1-Related Rod-Cone Dystrophy: A Case Report
Giovanni Marco Conti1,2, Francesca Cancellieri3,4, Mathieu Quinodoz3,4,5
1Genetic Ophthalmic Department, Hôpital Ophtalmique Jules-Gonin, University of Lausanne and Faculty of Life Sciences, Lausanne, Switzerland.
Introduction:
The GNB1 (guanine nucleotide-binding protein, β1) gene encodes for the ubiquitous β1 subunit of heterotrimeric G proteins, which are associated with G-protein-coupled receptors (GPCRs). GNB1 mutations cause a neurodevelopmental disorder characterized by a broad clinical spectrum. A novel variant has recently been confirmed in a case of rod-cone dystrophy.
Case Presentation:
We describe the second confirmed case of a classical rod-cone dystrophy associated with a mutation located in exon 6 of GNB1 [NM_002074.5:c.217G>C, p.(Ala73Pro)] in a 56-year-old patient also presenting mild intellectual disability, attention deficit/hyperactivity disorder, and truncal obesity.
Conclusion:
This paper confirms the role of GNB1 in the pathogenesis of a classic rod-cone dystrophy and highlights the importance of including this gene in the genetic analysis panel for inherited retinal diseases.
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