MT-ATP6 and NARP syndrome: Finally, comparison of the current data with those we previously reported for another common mtDNA mutation, m.8993T > G (MT-ATP6, ATP synthase subunit 6 gene; MIM♯ 516060) responsible for the NARP syndrome (Neuropathy, Ataxia, Retinitis Pigmentosa; MIM♯ 551500) [Steffann et al., 2006, 2007] indicates that these two mutations differentially influence mtDNA segregation during oogenesis, while their putative impact on mtDNA segregation appears quite similar in somatic cells during embryofetal development.