POLG and inborn mitochondrial metabolism disorder: Of the 34 patients with a genetic diagnosis of mitochondrial diseases, 44.1% (n = 15) were diagnosed with MELAS, 26.5% (n = 9) with Coenzyme Q10 deficiency, 11.8% (n = 4) with Leigh syndrome and 8.8% (n = 3) with POLG mutation.