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Neurology. 2012 Nov 20;79(21):2109-14. doi: 10.1212/WNL.0b013e3182752ca2. Epub 2012 Oct 17.

PRRT2 mutations in familial infantile seizures, paroxysmal dyskinesia, and hemiplegic migraine.

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  • 1Pediatric Neurology and Neurogenetics Unit and Laboratories, A. Meyer Children's Hospital-University of Florence, Florence, Italy.

Abstract

OBJECTIVE:

To perform a clinical and genetic study of a family with benign familial infantile seizures (BFIS) and, upon finding a PRRT2 gene mutation, to study a cohort of probands with a similar phenotype. We extended the study to all available family members to find out whether PRRT2 mutations cosegregated with additional symptoms.

METHODS:

We carried out a clinical and genealogic study of a 3-generation family and of 32 additional probands with BFIS (11 families), infantile convulsions and paroxysmal choreoathetosis (ICCA) (9 families), BFIS/generalized epilepsy with febrile seizures plus (5 families), and sporadic benign neonatal or infantile seizures (7 probands/families). We performed a genetic study consisting of linkage analysis and PRRT2 screening of the 33 probands/families.

RESULTS:

We obtained a positive linkage in the 16p11.3-q23.1 chromosomal region in the large BFIS family. Mutation analysis of PRRT2 gene revealed a c.649dupC (p.Arg217Profs*8) in all affected individuals. PRRT2 analysis of the 32 additional probands showed mutations in 10, 8 familial and 2 sporadic, probands. Overall we found PRRT2 mutations in 11 probands with a mutation rate of 11 out of 33 (33%). BFIS co-occurred with migraine and febrile seizures in 2 families, with childhood absence epilepsy in one family and with hemiplegic migraine in one family.

CONCLUSION:

Our results confirm the predominant role of PRRT2 mutations in BFIS and expand the spectrum of PRRT2-associated phenotypes to include febrile seizures, childhood absence seizures, migraine, and hemiplegic migraine.

PMID:
23077026
PMCID:
PMC3511926
DOI:
10.1212/WNL.0b013e3182752ca2
[PubMed - indexed for MEDLINE]
Free PMC Article
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