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Dohrn, Maike F; Heller, Corina; Zengeler, Diana; Obermaier, Carolin D; Biskup, Saskia; Weis, Joachim; Nikolin, Stefan; Claeys, Kristl G; Schöne, Ulrike; Beijer, Danique; Winter, Natalie; Achenbach, Pascal; Gess, Burkhard; Schulz, Jörg B; Mulahasanovic, Lejla
Neurological research and practice, 02/2022, Letnik: 4, Številka: 1Journal Article
By whole-exome sequencing, we found the heterozygous POLG variant c.3542G>A; p.Ser1181Asn in a family of four affected individuals, presenting with a mixed neuro-myopathic phenotype. The variant is located within the active site of polymerase gamma, in a cluster region associated with an autosomal dominant inheritance. In adolescence, the index developed distal atrophies and weakness, sensory loss, afferent ataxia, double vision, and bilateral ptosis. One older sister presented with Charcot-Marie-Tooth-like symptoms, while the youngest sister and father reported exercise-induced muscle pain and proximal weakness. In none of the individuals, we observed any involvement of the central nervous system. Muscle biopsies obtained from the father and the older sister showed ragged-red fibers, and electron microscopy confirmed mitochondrial damage. We conclude that this novel POLG variant explains this family's phenotype.
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