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Sequence diversity of KIAA0027/MLC1: are megalencephalic leukoencephalopathy and schizophrenia allelic disorders?

Claudia Rubie1, Peter Lichtner, Jutta Gärtner

  • 1Department of Psychiatry and Psychotherapy, University of Würzburg, Würzburg, Germany.

Human Mutation
|December 24, 2002
PubMed

Insights

This study investigated the KIAA0027/MLC1 gene

Area of Science:

  • Neurogenetics
  • Molecular Biology
  • Psychiatric Genetics

Background:

  • Megalencephalic leukoencephalopathy with subcortical cysts (MLC) and schizophrenia, particularly the catatonic subtype, were hypothesized as allelic diseases.
  • The KIAA0027/MLC1 gene was proposed as a potential common etiological factor.
  • Previous research suggested a link between MLC1 and these conditions, necessitating further validation.

Purpose of the Study:

  • To validate the etiological role of KIAA0027/MLC1 in childhood-onset megalencephalic leukoencephalopathy with subcortical cysts (MLC).
  • To investigate the involvement of KIAA0027/MLC1 in schizophrenia, specifically the catatonic subtype.
  • To determine if MLC and schizophrenia are allelic disorders linked by KIAA0027/MLC1 mutations.

Main Methods:

  • Genetic mutation screening in five patients diagnosed with MLC.
  • Systematic mutation screening of the KIAA0027/MLC1 gene in 140 index cases of schizophrenia.
  • Analysis of single nucleotide polymorphisms (SNPs) and insertion/deletion polymorphisms in patient cohorts and controls.
  • Segregation analysis of specific variants in multiplex pedigrees.

Main Results:

  • Four distinct mutant alleles of KIAA0027/MLC1 were identified in the five MLC patients.
  • Thirteen different single nucleotide polymorphisms (SNPs) were found in schizophrenia patients, with two coding variants (C171F, N218K) present in controls.
  • A previously implicated L309M variant and a 5'-end exon 11 polymorphism showed no significant association with schizophrenia.
  • The KIAA0027/MLC1 gene was found at equal frequency in schizophrenic patients and controls.

Conclusions:

  • The study confirms allelic heterogeneity in megalencephalic leukoencephalopathy (MLC).
  • KIAA0027/MLC1 is excluded as a primary susceptibility locus for schizophrenia.
  • The findings rule out MLC and schizophrenia as allelic disorders due to KIAA0027/MLC1 mutations.

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