In agreement with previous studies (Filla et al., 1996; Deutsch et al., 2010; Plasterer et al., 2013), we observed that in homozygous FRDA patients, mature frataxin, isoform E, and total frataxin levels were inversely correlated with GAA1 repeat lengths (Figure 6). The gene discussed is FXN; the disease is Friedreich ataxia.