Identification of proteolipid protein 1 gene duplication by multiplex ligation-dependent probe amplification: First report of genetically confirmed family of pelizaeus-merzbacher disease in Korea

Joo Kim Sei, Shik Yoon Joon, Jin Baek Hye, Il Suh Sang, Young Bae Sook, Hyun Jung Cho, Chang Seok Ki

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4 Citations (Scopus)


Pelizaeus-Merzbacher disease (PMD) is a rare X-linked recessive disorder with a prototype of a dysmyelinating leukodystrophy that is caused by a mutation in the proteolipid protein 1 (PLP1) gene on the long arm of the X chromosome in band Xq22. This mutation results in abnormal expression or production of PLP. We here present a Korean boy with spastic quadriplegia, horizontal nystagmus, saccadic gaze, intentional tremor, head titubation, ataxia, and developmental delay. The brain magnetic resonance imaging (MRI) showed abnormally high signal intensities in the white matter tract, including a subcortical U fiber on the T2-weighted and fluid attenuated inversion recovery (FLAIR) image. The chromosomal analysis was normal; however, duplication of the PLP1 gene in chromosome Xq22 was detected when the multiplex ligation-dependent probe amplification (MLPA) method was used. We also investigated the pedigree for a genetic study related to PMD. This case suggests that the duplication mutation of the PLP1 gene in patients with PMD results in a mild clinical form of the disorder that mimics the spastic quadriplegia of cerebral palsy.

Original languageEnglish
Pages (from-to)328-331
Number of pages4
JournalJournal of Korean medical science
Issue number2
Publication statusPublished - 2008 Apr 1



  • Gene amplification
  • Pelizaeus-merzbacher disease
  • Propeolipid protein duplication
  • Quadriplegia

ASJC Scopus subject areas

  • Medicine(all)

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