Mutations in MTHFR and POLG impaired activity of the mitochondrial respiratory chain in 46-year-old twins with spastic paraparesis.
Fiche publication
Date publication
octobre 2019
Journal
Journal of human genetics
Auteurs
Membres identifiés du Cancéropôle Est :
Pr GUEANT Jean-Louis, Dr OUSSALAH Abderrahim
Tous les auteurs :
Wiedemann A, Chery C, Coelho D, Flayac J, Gueguen N, Desquiret-Dumas V, Feillet F, Lavigne C, Neau JP, Fowler B, Baumgartner MR, Reynier P, Guéant JL, Oussalah A
Lien Pubmed
Résumé
Hereditary spastic paraplegias (HSPs) are characterized by lower extremity spasticity and weakness. HSP is often caused by mutations in SPG genes, but it may also be produced by inborn errors of metabolism. We performed next-generation sequencing of 4813 genes in one adult twin pair with HSP and severe muscular weakness occurring at the same age. We found two pathogenic compound heterozygous variants in MTHFR, including a variant not referenced in international databases, c.197C>T (p.Pro66Leu) and a known variant, c.470G>A (p.Arg157Gln), and two heterozygous pathogenic variants in POLG, c.1760C>T (p.Pro587Leu) and c.752C>T (p.Thr251Ile). MTHFR and POLG mutations were consistent with the severe muscle weakness and the metabolic changes, including hyperhomocysteinemia and decreased activity of both N(5,10)methylenetetrahydrofolate reductase (MTHFR) and complexes I and II of the mitochondrial respiratory chain. These data suggest the potential role of MTHFR and POLG mutations through consequences on mitochondrial dysfunction in the occurrence of spastic paraparesis phenotype with combined metabolic, muscular, and neurological components.
Référence
J. Hum. Genet.. 2019 Oct 23;: