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Leukodystrophy (Genetic White Matter Disease)

Inherited disorders affecting myelin formation or maintenance, causing progressive neurological decline

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Nöroloji department. Book Appointment →

What is Leukodystrophy (Genetic White Matter Disease)?

Leukodystrophies result from genetic defects in myelin synthesis, maintenance, or breakdown.

Over 50 distinct leukodystrophies are recognized; major types include metachromatic, Krabbe, adrenoleukodystrophy (X-ALD), Pelizaeus-Merzbacher, Canavan, Alexander, vanishing white matter disease.

Inheritance varies: autosomal recessive (most lysosomal types), X-linked (adrenoleukodystrophy, Pelizaeus-Merzbacher), autosomal dominant (rare adult-onset).

Pathophysiology involves enzyme deficiencies (e.g., arylsulfatase A in MLD, galactocerebrosidase in Krabbe), peroxisomal dysfunction (X-ALD), or myelin protein defects.

Diagnosis combines MRI patterns, biochemical testing, and genetic confirmation.

Newborn screening for X-ALD enables presymptomatic treatment with hematopoietic stem cell transplantation.

Symptoms

Infantile forms: developmental delay, hypotonia, seizures, optic atrophy, irritability.
Childhood forms: gait disturbance, spasticity, cognitive decline, behavioral changes, school problems.
Adult forms: progressive cognitive decline, behavioral/psychiatric symptoms, gait problems, bowel/bladder dysfunction.
X-ALD specific: adrenal insufficiency, behavioral changes, vision/hearing loss, spastic paraparesis (AMN form).
Vision loss, deafness, dysarthria, dysphagia in advanced disease.
Seizures, especially in late-stage or specific subtypes (Alexander, Canavan).

Risk Factors

Family history of leukodystrophy or unexplained neurological decline.
Consanguinity (autosomal recessive forms).
Male sex (X-linked forms: adrenoleukodystrophy, Pelizaeus-Merzbacher).
Specific ethnic groups: Ashkenazi Jews (Canavan), Saudi Arabian (juvenile MLD).
Carrier parents with positive family history.
Prenatal/perinatal complications can mimic leukodystrophy.

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Unexplained developmental regression in previously typical child.
  • Progressive gait or motor decline in child or young adult.
  • Family history of leukodystrophy - genetic counseling and carrier testing.
  • Adult-onset cognitive decline or behavioral change with white matter changes on MRI.
  • Newborn screening positive for X-ALD - urgent referral to specialist center.
  • MRI findings of symmetric white matter abnormalities in characteristic patterns.

Treatment Methods

01
Diagnostic workup: MRI brain (characteristic patterns), VLCFA (X-ALD), enzyme assays (MLD, Krabbe), genetic testing.
02
Hematopoietic stem cell transplantation (HSCT) for selected leukodystrophies (X-ALD with cerebral involvement, presymptomatic infantile MLD/Krabbe) - best outcome when early.
03
Gene therapy: elivaldogene autotemcel (Skysona) approved for cerebral X-ALD; investigational for MLD, Krabbe.
04
Enzyme replacement therapy and substrate reduction (under investigation for several types).
05
Adrenal insufficiency management in X-ALD: glucocorticoid and mineralocorticoid replacement.
06
Symptomatic treatment: antiepileptics, antispasticity (baclofen, botulinum toxin), nutritional support, PEG feeding.
07
Multidisciplinary care: pediatric neurology, genetics, rehabilitation, palliative care.
08
Family genetic counseling, prenatal diagnosis options for at-risk pregnancies.

Which Department to Visit?

You can visit our Nöroloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.