Unusual variability of PRRT2 linked phenotypes within a family.

Background: Mutations in the proline-rich transmembrane protein 2 (PRRT2) gene on chromosome 16p11.2 have recently been identified as a cause of paroxysmal kinesigenic dyskinesias (PKD), infantile convulsions and choreoathetosis (ICCA) syndrome or infantile convulsions (IC).

Aims: Here, we describe a family with four affected members.