SLX4 and Friedreich ataxia: Mutations in the remaining FA genes, FANCI, BRIP1 (FANCJ), FANCL, FANCM, PALB2 (FANCN), RAD51C (FANCO), SLX4 (FANCP), ERCC4 (FANCQ), BRCA1 (FANCS), and the recently reported RAD51(FANCR) and UBE2T (FANCT), contribute to <5 % of FA cases, combined [5, 17].