We similarly investigated seven mutations (T9176G, T8851C, T8993G, T9191C, T9176C, T8993C and T9185C) of the mitochondrial ATP6 gene found in individuals with neuropathy, ataxia and retinitis pigmentosa (NARP; see Box 2), Leigh syndrome (LS; see Box 2) or bilateral striatal lesions of childhood (BSLC) (Kabala et al., 2014; Kucharczyk et al., 2010, , 2013, , 2009a, ,b; Rak et al., 2007). This evidence concerns the gene MT-ATP6 and NARP syndrome.