Paroxysmal kinesigenic choreoathetosis (PKC): Confirmation of linkage to 16p11-q21, but unsuccessful detection of mutations among 157 genes at the PKC-critical region in seven PKC families

Taeko Kikuchi, Masayo Nomura, Hiroaki Tomita, Naoki Harada, Kazuaki Kanai, Tohru Konishi, Ayako Yasuda, Masato Matsuura, Nobumasa Kato, Koh Ichiro Yoshiura, Norio Niikawa

Research output: Contribution to journalArticlepeer-review

41 Citations (Scopus)

Abstract

Paroxysmal kinesigenic choreoathetosis (PKC) is a paroxysmal movement disorder of unknown cause. Although the PKC-critical region (PKCCR) has been assigned to the pericentromeric region of chromosome 16 by several studies of families from various ethnic backgrounds, the causative gene has not yet been identified. In the present study, we performed linkage and haplotype analysis in four new families with PKC, as well as an intensive polymerase chain reaction (PCR) based mutation analysis in seven families for a total of 1,563 exons from 157 genes mapped around the PKCCR. Consequently, the linkage/haplotype analysis revealed that PKC was assigned to a 24-cM segment between D16S3131 and D16S408, the result confirming the previously defined PKCCR, but being unable to narrow it down. Although the mutation analysis of the 157 genes was unsuccessful at identifying any mutations that were shared by patients from the seven families, two nonsynonymous substitutions, i.e., 6186C>A in exon 3 of SCNN1G and 45842A>G in exon 29 of ITGAL, which were segregated with the disease in Families C and F, respectively, were not observed in more than 400 normal controls. Thus, one of the two genes, SCNN1G and ITGAL, could be causative for PKC, but we were not able to find any other mutations that explain the PKC phenotype.

Original languageEnglish
Pages (from-to)334-341
Number of pages8
JournalJournal of Human Genetics
Volume52
Issue number4
DOIs
Publication statusPublished - 2007 Apr

Keywords

  • ITGAL
  • Linkage analysis
  • Mutation analysis
  • PKC-critical region
  • Paroxysmal kinesigenic choreoathetosis (PKC)
  • SCNN1G

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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