POLG and epilepsy: In all, we identified eight patients with intractable epilepsy without liver manifestations at presentation of their epilepsy associated with the following combinations of POLG mutations: p.[G848S]+[p.P587L;p.P589T], p.[A467T]+[A467T], p.[A467T]+[R417T], p.[W748S]+[G1205E], p.[A467T]+[G848S], p.[W748S]+[W748S], and p.[A467T]+[L966R].