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Megalencephalic leukoencephalopathy with cysts without MLC1 defect

Marjo S van der Knaap1, Vincent Lai, Wolfgang Köhler

  • 1Department of Child Neurology, VU University Medical Center, Amsterdam, the Netherlands. ms.vanderknaap@vumc.nl

Annals of Neurology
|June 3, 2010
PubMed

Insights

Megalencephalic leukoencephalopathy with subcortical cysts (MLC) not caused by MLC1 mutations presents two distinct phenotypes. Some patients show a classical severe presentation, while others exhibit a milder, benign form with improved MRI findings and less severe symptoms.

Area of Science:

  • Neurology
  • Genetics
  • Radiology

Background:

  • Megalencephalic leukoencephalopathy with subcortical cysts (MLC) is a severe autosomal recessive neurological disorder.
  • Characterized by infantile macrocephaly, white matter abnormalities, and subcortical cysts on MRI.
  • Mutations in MLC1 account for approximately 80% of diagnosed cases.

Purpose of the Study:

  • To investigate the clinical and imaging characteristics of MLC patients without MLC1 mutations.
  • To identify distinct phenotypic patterns in this subgroup.

Main Methods:

  • Clinical evaluation of 16 MLC patients lacking MLC1 mutations.
  • Analysis of Magnetic Resonance Imaging (MRI) findings.
  • Assessment of motor and cognitive development.

Main Results:

  • Eight patients presented with the classical MLC phenotype.
  • The other eight patients exhibited a benign phenotype with significant MRI improvement and preserved motor function.
  • Among the benign phenotype group, five had normal intelligence, and three had cognitive deficiencies.

Conclusions:

  • MLC patients without MLC1 mutations can display two distinct phenotypes: a classical severe form and a benign form.
  • This finding expands the understanding of MLC's genetic and phenotypic spectrum.

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