Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2012 Aug 21;79(8):777-84.
doi: 10.1212/WNL.0b013e3182661fe3. Epub 2012 Aug 8.

PRRT2 phenotypes and penetrance of paroxysmal kinesigenic dyskinesia and infantile convulsions

Rianne van Vliet  1 , Guido Breedveld, Johanneke de Rijk-van Andel, Eva Brilstra, Nienke Verbeek, Corien Verschuuren-Bemelmans, Maartje Boon, Johnny Samijn, Karin Diderich, Ingrid van de Laar, Ben Oostra, Vincenzo Bonifati, Anneke Maat-Kievit
Affiliations

PRRT2 phenotypes and penetrance of paroxysmal kinesigenic dyskinesia and infantile convulsions

Rianne van Vliet et al. Neurology. .

Abstract

Objective: To describe the phenotypes and penetrance of paroxysmal kinesigenic dyskinesia (PKD), a movement disorder characterized by attacks of involuntary movements occurring after sudden movements, infantile convulsion and choreoathetosis (ICCA) syndrome, and benign familial infantile convulsions (BFIC), caused by PRRT2 mutations.

Methods: We performed clinical and genetic studies in 3 large families with ICCA, 2 smaller families with PKD, and 4 individuals with sporadic PKD. Migraine was also present in several individuals.

Results: We detected 3 different PRRT2 heterozygous mutations: the recurrent p.Arg217Profs*8 mutation, previously reported, was identified in 2 families with ICCA, 2 families with PKD, and one individual with sporadic PKD; one novel missense mutation (p.Ser275Phe) was detected in the remaining family with ICCA; and one novel truncating mutation (p.Arg217*) was found in one individual with sporadic PKD. In the 2 remaining individuals with sporadic PKD, PRRT2 mutations were not detected. Importantly, PRRT2 mutations did not cosegregate with febrile convulsions or with migraine. The estimated penetrance of PRRT2 mutations was 61%, if only the PKD phenotype was considered; however, if infantile convulsions were also taken into account, the penetrance was nearly complete. Considering our findings and those reported in literature, 23 PRRT2 mutations explain ∼56% of the families analyzed.

Conclusions: PRRT2 mutations are the major cause of PKD or ICCA, but they do not seem to be involved in the etiology of febrile convulsions and migraine. The identification of PRRT2 as a major gene for the PKD-ICCA-BFIC spectrum allows better disease classification, molecular confirmation of the clinical diagnosis, and genetic testing and counseling.

PubMed Disclaimer

Similar articles

See all similar articles

Cited by

See all "Cited by" articles

Publication types

MeSH terms

Supplementary concepts

LinkOut - more resources