SLX4 and Friedreich ataxia: To date, 15 genes associated with FA in patients have been identified and cloned: FANCA, FANCB, FANCC, FANCD1/BRCA2, FANCD2, FANCE, FANCF, FANCG, FANCI, FANCJ/BACH1/BRIP1, FANCL/PHF9/POG, FANCM, FANCN/PALB2, FANCO/Rad51C [4], and FANCP/SLX4/BTBD12 (Table 1) [5–7].