PRRT2 and episodic kinesigenic dyskinesia 1: <h4>Background</h4>Pathogenic heterozygous variants in the gene encoding proline-rich transmembrane protein 2 (PRRT2) have been recently identified as the major cause of familial infantile convulsion and choreoathetosis syndrome (OMIM#602,066), a spectrum of autosomal dominant paroxysmal neurological disorders, including self-limited infantile epilepsy (SeLIE) and infantile convulsion that can be isolated (IC) or associated with paroxysmal kinesigenic dyskinesia (PKD/IC).