ERCC4 and Friedreich ataxia: For example, mutations in SLX4 (FANCP) and XPF (FANCQ) are associated with Fanconi anemia (FA) (Bogliolo et al., 2013, Kashiyama et al., 2013, Kim et al., 2011, Stoepker et al., 2011), a rare autosomal recessive disorder characterized by physical abnormalities, bone marrow failure, and cancer predisposition.