Adrenoleukodystrophy: Symptoms, Causes, and Treatment

Written by Medicover Team and Medically Reviewed by Dr Prachi Rahul Pawar , Neurologists

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1. Causes 2. Find a Doctor 3. Diagnosis 4. Treatment 5. FAQs

Adrenoleukodystrophy is a peroxisomal disorder, meaning it involves the malfunction of peroxisomes, which are cellular structures responsible for breaking down very long-chain fatty acids (VLCFAs). In ALD, the body accumulates VLCFAs, leading to damage and destruction of myelin, the protective sheath around nerve cells.

It is a genetic condition caused by mutations in a specific gene.
The disorder leads to a buildup of very long-chain fatty acids in the body.
This buildup damages the nervous system and adrenal glands.
It mainly affects males due to its X-linked genetic inheritance.

What Are the Types of Adrenoleukodystrophy?

Childhood Cerebral ALD

This type is the most aggressive and progresses rapidly, usually affecting young boys. It leads to severe neurological impairment and can be life-threatening if untreated.

Typically appears between 4 and 10 years of age.
Causes rapid damage to brain white matter.
Leads to progressive neurological decline.

Adrenomyeloneuropathy (AMN)

AMN is a milder form that generally appears in young adulthood. It progresses slowly and mainly affects the spinal cord and peripheral nerves.

Gradual stiffness and weakness in the legs.
Damage to spinal cord nerve pathways.
May cause mobility and bladder issues.

Addison-Only ALD

In some individuals, symptoms occur mainly due to adrenal gland dysfunction without neurological damage.

Often diagnosed during adolescence or adulthood.
Primarily causes adrenal hormone deficiency.
Neurological symptoms may be absent initially.

What Are the Symptoms of Adrenoleukodystrophy?

The symptoms of ALD vary depending on the form of the disease and the age at which it appears. Early identification of symptoms can help guide timely medical evaluation and management.

Childhood Cerebral ALD

This severe form usually appears between the ages of 4 and 10 and affects neurological function.

Behavioral changes
Decline in school performance
Vision and hearing loss
Difficulty with coordination and balance
Seizures

Adolescent and Adult ALD

Symptoms appearing later in life tend to progress slowly and mainly affect mobility and nerve function.

Progressive stiffness and weakness in the legs (paraparesis)
Bladder and bowel dysfunction
Sexual dysfunction

Addison's Disease (Adrenal Insufficiency)

Many individuals with ALD develop adrenal insufficiency due to adrenal gland dysfunction.

Fatigue
Weight loss
Hyperpigmentation
Low blood pressure
Salt craving

What Causes Adrenoleukodystrophy?

Adrenoleukodystrophy occurs due to mutations in the ABCD1 gene located on the X chromosome. This gene produces a protein responsible for breaking down very long-chain fatty acids inside cells. When the gene is defective, VLCFAs accumulate and damage the myelin sheath surrounding nerve cells.

Mutation in the ABCD1 gene.
Accumulation of very long-chain fatty acids in the body.
Damage to the myelin sheath protecting nerve fibers.
Disruption of adrenal gland function.

Genetic Inheritance

Since ALD is an X-linked genetic disorder, males are more commonly affected, while females may act as carriers and sometimes develop mild symptoms.

Sons of carrier mothers have a 50% chance of developing the condition.
Daughters of carrier mothers have a 50% chance of becoming carriers.
Females may develop mild neurological symptoms later in life.

When Should You See a Doctor for Adrenoleukodystrophy?

Consulting a neurologist is important if symptoms related to neurological decline or adrenal dysfunction appear, especially in children with a family history of ALD.

Sudden behavioral or learning changes in children.
Progressive weakness or stiffness in the legs.
Symptoms of adrenal insufficiency such as fatigue or low blood pressure.
Family history of genetic neurological disorders.

Adrenoleukodystrophy is usually treated and monitored by specialists such as neurologists, endocrinologists, and genetic medicine experts.

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How is Adrenoleukodystrophy Diagnosed?

Early diagnosis helps monitor disease progression and allows doctors to initiate appropriate treatment strategies before severe neurological damage occurs.

Blood Tests

Blood tests help measure VLCFA levels and assess adrenal gland function.

Detect elevated levels of very long-chain fatty acids.
Evaluate adrenal hormone levels.

Genetic Testing

Genetic testing confirms mutations in the ABCD1 gene and helps identify carriers within families.

Confirms the diagnosis.
Used for carrier detection.
Helps in prenatal diagnosis.

MRI Scans

MRI scans help detect abnormalities in the white matter of the brain and track disease progression.

Identifies early brain changes.
Monitors disease progression.
Helps guide treatment decisions.

Newborn Screening

Some regions include ALD screening in newborn testing programs for early detection.

Blood sample collected shortly after birth.
Checks for elevated VLCFA levels.
Allows early monitoring and intervention.

What Are the Treatment Options for Adrenoleukodystrophy?

Although there is currently no complete cure for ALD, several treatments aim to slow disease progression and manage symptoms effectively.

Lorenzo's Oil

Lorenzo's Oil is a mixture of fatty acids derived from olive and rapeseed oils that may reduce VLCFA levels in the blood.

Helps lower VLCFA levels.
May delay symptom development in asymptomatic boys.

Hematopoietic Stem Cell Transplantation (HSCT)

HSCT can stop the progression of cerebral ALD if performed early.

Replaces defective cells with healthy stem cells.
Improves the body's ability to break down VLCFAs.

Gene Therapy

Gene therapy aims to correct the defective ABCD1 gene and restore normal function.

Uses modified genes to restore cellular function.
Still under clinical research and trials.

Adrenal Hormone Replacement

Hormone replacement therapy helps manage adrenal insufficiency.

Corticosteroids replace deficient adrenal hormones.
Helps control fatigue, low blood pressure, and weakness.

Symptomatic Treatments

Supportive therapies help manage neurological and physical symptoms.

Physical therapy for mobility issues.
Medications to control seizures.
Psychological and behavioral support.

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What is the Recovery Process for Adrenoleukodystrophy?

Recovery and long-term management depend on the stage of the disease and the treatment approach used. Continuous monitoring and supportive therapies play an important role in improving quality of life.