PT2; Slc7a12), fibroblast (Col1a1), and myofibroblast (Acta2) of FA mice but not in podocytes (Nphs2), distal convoluted tubules (Slc12a3), intercalated cells of the collecting duct (Atp6v1g3), or principal cells (Aqp2). This evidence concerns the gene COL1A1 and Friedreich ataxia.