AGR2 and Friedreich ataxia: MAP2K1, PRDX3, NUBPL, PDE2A, KRAS, CHDH, AGR2, MTUS1, FSIP2, HOXB9, FSIP2, CRY2, and STARD13 were differentially expressed exclusively in FRDA-adults, and CREB1 was downregulated in FRDA-children only.