Mild paroxysmal kinesigenic dyskinesia caused by PRRT2 missense mutation with reduced penetrance
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Paroxysmal kinesigenic dyskinesia (PKD) is an uncommon disorder characterized by brief episodes of involuntary dystonia or choreoathetosis triggered by sudden voluntary movement.1 Recently, several groups identified mutations in patients with PKD in the proline-rich transmembrane protein 2 (PRRT2) gene.2,–,7 We report a missense c.913G>A (p.Gly305Arg) change in PRRT2 in 4 siblings with PKD, 2 with infrequent symptoms. The association of a milder phenotype and reduced penetrance with this missense mutation suggests partial loss of function.
Case Reports.
Four Caucasian siblings with PKD8 as well as an unaffected sibling and both unaffected parents were genotyped (figure). Institutional approval and informed consent were obtained.
II-1 is a 24 year-old man with brief episodes of …
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