Journal
DEVELOPMENTAL MEDICINE AND CHILD NEUROLOGY
Volume 55, Issue 4, Pages 327-334Publisher
WILEY
DOI: 10.1111/dmcn.12056
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Funding
- Reta Lila Weston Trust
- Muscular Dystrophy Campaign
- The Medical Research Council
- Wellcome Trust
- Parkinson's UK
- Parkinson's Foundation
- NIHR UCLH/UCL Biomedical Research Centre (CBRC)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)
- Dystonia Medical Research Foundation
- Reta Lila Weston Fellowship
- Action Medical Research
- Action Medical Research [1722] Funding Source: researchfish
- Medical Research Council [G1001253, G108/638, MR/J004758/1, G0802760] Funding Source: researchfish
- MRC [MR/J004758/1, G0802760, G108/638, G1001253] Funding Source: UKRI
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Aim To define better the phenotype and genotype of familial and sporadic cases of paroxysmal kinesigenic dyskinesia (PKD) caused by mutations in the PRRT2 gene presenting in the paediatric age group. Method We report the detailed clinical and molecular genetic features of 11 patients (six females, five males) with childhood-onset PRRT2-mutation-positive PKD. Results Mean age at disease onset was 8years 7.5months (range 511y), and clinical presentation was characterized by daily short paroxysmal episodes of dystonia/dyskinesia. Most patients also had non-kinesigenic attacks in addition to the classical movement-induced paroxysmal episodes. One family demonstrated great phenotypic variability with PKD, infantile convulsions, and/or hemiplegic migraine affecting different family members with the same mutation. All patients in whom antiepileptics (carbamazepine/phenytoin) were tried showed a dramatic improvement with complete abolition of dyskinetic episodes. Interpretation Our case series provides a detailed clinical description of patients with PRRT2-PKD, and reports a spectrum of disease-causing mutations, thereby expanding both the clinical phenotype and mutation spectrum of disease.
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