Although Higgins et al. (2005) reported an association between essential tremor and a substitution in the HS1BP3 gene (609359), Deng et al. (2005) found no association between the same substitution and essential tremor or Parkinson disease (168600) among ... Although Higgins et al. (2005) reported an association between essential tremor and a substitution in the HS1BP3 gene (609359), Deng et al. (2005) found no association between the same substitution and essential tremor or Parkinson disease (168600) among 222 and 285 affected patients, respectively. Furthermore, the substitution allele was present in 12 (9.1%) of 132 control individuals, indicating it is a polymorphism.