Novel PRRT2 mutation in an African-American family with paroxysmal kinesigenic dyskinesia

Peter Hedera, Jianfeng Xiao, Andreas Puschmann, Dragana Momcilovic, Steve W. Wu, Mark S. LeDoux

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Abstract

Background: Recently, heterozygous mutations in PRRT2 (Chr 16p11.2) have been identified in Han Chinese, Japanese and Caucasians with paroxysmal kinesigenic dyskinesia. In previous work, a paroxysmal kinesigenic dyskinesia locus was mapped to Chr 16p11.2 - q11.2 in a multiplex African-American family. Methods: Sanger sequencing was used to analyze all four PRRT2 exons for sequence variants in 13 probands (9 Caucasian, 1 Caucasian-Thai, 1 Vietnamese and 2 African-American) with some form of paroxysmal dyskinesia. Results: One patient of mixed Caucasian-Thai background and one African-American family harbored the previously described hotspot mutation in PRRT2 (c.649dupC, p.R217Pfs*8). Another African-American family was found to have a novel mutation (c.776dupG, p.E260*). Both of these variants are likely to cause loss-of-function via nonsense-mediated decay of mutant PRRT2 transcripts. All affected individuals had classic paroxysmal kinesigenic dyskinesia phenotypes. Conclusions: Heterozygous PRRT2 gene mutations also cause paroxysmal kinesigenic dyskinesia in African-Americans. The c.649dupC hotspot mutation in PRRT2 is common across racial groups.
Original languageEnglish
JournalBMC Neurology
Volume12
Issue number93
DOIs
Publication statusPublished - 2012

Subject classification (UKÄ)

  • Neurology

Keywords

  • PKD
  • PRRT2
  • African-American
  • ICCA
  • Hotspot mutation

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