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The neurogenetics of mucolipidosis type IV

G Altarescu1, M Sun, D F Moore

  • 1Developmental and Metabolic Neurology Branch, National Institute of Neurologic Disorders and Stroke/NIH, 9000 Rockville Pike, Building 10, Rm. 3D03, Bethesda, MD 20892-1260, USA.

Neurology
|August 17, 2002
PubMed
Abstract

Insights

Mucolipidosis type IV (MLIV) is a genetic disorder affecting development and causing degeneration. MCOLN1 gene mutations are present in all patients, correlating with neurological and brain abnormalities.

Area of Science:

  • Genetics
  • Neuroscience
  • Ophthalmology

Background:

  • Mucolipidosis type IV (MLIV) is an autosomal recessive genetic disorder.
  • It results from mutations in the MCOLN1 gene, which encodes mucolipin, a TRP channel protein.

Purpose of the Study:

  • To comprehensively characterize the clinical and genetic abnormalities in MLIV patients.
  • To investigate the correlation between genotype and clinical presentation.

Main Methods:

  • Studied 28 MLIV patients (ages 2-25) with standard clinical, neuroimaging, neurophysiologic, and genetic techniques.
  • Follow-up for up to 5 years in 10 patients.

Main Results:

  • All patients exhibited corneal clouding, optic atrophy, and retinal dystrophy.
  • 23 patients had severe motor/mental impairment; 12 had iron deficiency/anemia.
  • Consistent MRI findings included a thin corpus callosum; MCOLN1 mutations were found in all patients, correlating with neurological deficits.

Conclusions:

  • MLIV presents as both a developmental and degenerative disorder.
  • Its cerebral palsy-like encephalopathy presentation can lead to diagnostic delays.

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