MSX1 and Huntington disease: MSX1 mutations are associated with the non-syndromic co-occurrence of CP and TA, especially HD, in humans (Table 1; Supplementary Table 4) (Carey and Viskochil 2002; Lidral and Reising 2002; Slayton et al. 2003; Vieira 2003; Wong and Hagg 2004; Modesto et al. 2006; Wilkie 2009; Kouskoura et al. 2011; Liang et al. 2012; Leslie and Marazita 2013).