New variants expand the neurological phenotype of COQ7 deficiency

The protein encoded by COQ7 is required for CoQ(10) synthesis in humans, hydroxylating 3-demethoxyubiquinol (DMQ(10)) in the second to last steps of the pathway. COQ7 mutations lead to a primary CoQ(10) deficiency syndrome associated with a pleiotropic neurological disorder. This study shows the cli...

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Detalles Bibliográficos
Autores: Fabra MA, Paredes-Fuentes AJ, Torralba Carnerero M, Moreno Férnandez de Ayala DJ, Arroyo Luque A, Sánchez Cuesta A, Staiano C, Sanchez-Pintos P, Luz Couce M, Tomás M, Marco-Hernández AV, Orellana C, Martínez F, Roselló M, Caro A, Oltra Soler JS, Monfort S, Sánchez A, Rausell D, Vitoria I, Del Toro M, Garcia-Cazorla A, Julia-Palacios NA, Jou C, Yubero D, López LC, Hernández Camacho JD, López Lluch G, Ballesteros Simarro M, Rodríguez Aguilera JC, Calvo GB, Cascajo Almenara MV, Artuch R, Santos-Ocaña C
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2024
País:España
Institución:Fundació Sant Joan de Déu
Repositorio:r-FSJD. Repositorio Institucional de Producción Científica de la Fundació Sant Joan de Déu
OAI Identifier:oai:fsjd.fundanetsuite.com:p26516
Acceso en línea:https://fsjd.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=26516
Access Level:acceso abierto
Palabra clave:CoQ10
COQ7
mitochondrial diseases
neurological disorders
Descripción
Sumario:The protein encoded by COQ7 is required for CoQ(10) synthesis in humans, hydroxylating 3-demethoxyubiquinol (DMQ(10)) in the second to last steps of the pathway. COQ7 mutations lead to a primary CoQ(10) deficiency syndrome associated with a pleiotropic neurological disorder. This study shows the clinical, physiological, and molecular characterization of four new cases of CoQ(10) primary deficiency caused by five mutations in COQ7, three of which have not yet been described, inducing mitochondrial dysfunction in all patients. However, the specific combination of the identified variants in each patient generated precise pathophysiological and molecular alterations in fibroblasts, which would explain the differential in vitro response to supplementation therapy. Our results suggest that COQ7 dysfunction could be caused by specific structural changes that affect the interaction with COQ9 required for the DMQ(10) presentation to COQ7, the substrate access to the active site, and the maintenance of the active site structure. Remarkably, patients' fibroblasts share transcriptional remodeling, supporting a modification of energy metabolism towards glycolysis, which could be an adaptive mechanism against CoQ(10) deficiency. However, transcriptional analysis of mitochondria-associated pathways showed distinct and dramatic differences between patient fibroblasts, which correlated with the extent of pathophysiological and neurological alterations observed in the probands. Overall, this study suggests that the combination of precise genetic diagnostics and the availability of new structural models of human proteins could help explain the origin of phenotypic pleiotropy observed in some genetic diseases and the different responses to available therapies.

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