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Related Experiment Video

Updated: May 11, 2026

Modeling Encephalopathy of Prematurity Using Prenatal Hypoxia-ischemia with Intra-amniotic Lipopolysaccharide in Rats
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Inborn errors of brain myelin formation.

Odile Boespflug-Tanguy1

  • 1National Reference Center for Rare Diseases "leukodystrophies", INSERM U676, Université Paris Diderot, Sorbonne Paris Cité Université and Pediatric Neurology and Metabolic Disease Service, Hôpital Robert Debré, Paris, France.

Handbook of Clinical Neurology
|April 30, 2013
PubMed
Summary

Hypomyelinating leukodystrophies (HLD) are brain disorders impairing myelin formation. Genetic defects in myelin proteins like PLP and GJC2 cause severe developmental delays or progressive axonopathy.

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Area of Science:

  • Neuroscience
  • Genetics
  • Neurology

Background:

  • Hypomyelinating leukodystrophies (HLD) are a diverse group of central nervous system (CNS) white matter diseases.
  • These disorders stem from impaired myelin production by oligodendrocytes.
  • Cerebral magnetic resonance imaging (MRI) is crucial for assessing myelination patterns.

Purpose of the Study:

  • To review the classification and genetic basis of hypomyelinating leukodystrophies.
  • To correlate clinical presentations with the degree of hypomyelination and genetic defects.
  • To highlight the role of specific genes in HLD pathogenesis.

Main Methods:

  • Review of existing literature on hypomyelinating leukodystrophies.
  • Analysis of clinical presentations and neuroimaging findings.
  • Correlation of genotype with phenotype in HLD patients.

Main Results:

  • HLD severity ranges from severe developmental delay (Pelizaeus-Merzbacher disease) to progressive axonopathy.
  • X-linked HLD1 involves mutations in the proteolipid protein (PLP) gene.
  • Autosomal recessive HLD2 is associated with the GJC2 gene, encoding oligodendrocyte-specific connexin.

Conclusions:

  • HLD classification is based on genetic defects and clinical signs.
  • Understanding the genetic underpinnings of HLD is essential for diagnosis and potential therapies.
  • Specific genes like PLP and GJC2 play critical roles in CNS myelination.