TMPRSS15 and episodic kinesigenic dyskinesia: In 2002, Holzinger et al. (2002) sequenced two families with EKD reported by Haworth et al. (1971) in 1971 and Hadorn et al. (1975) in 1975, and they found that the compound heterozygous variants in the TMPRSS15 gene were responsible for the onset of EKD.