Johanna Hynynen, Tuomas Komulainen, Eija Tukiainen, Arno Nordin, Johanna Arola, Reetta Kälviäinen, Leena Jutila, Matias Röyttä, Reetta Hinttala, Kari Majamaa, Heikki Mäkisalo, Johanna Uusimaa – 28 July 2014 – Patients with mutations in the POLG1 gene encoding mitochondrial DNA polymerase gamma have an increased risk of valproate‐induced liver failure. POLG1 mutations are common, and these patients often suffer from intractable seizures. The role of liver transplantation in the treatment of patients with mitochondrial diseases has been controversial.