Adrenoleukodystrophy
A rare genetic (inherited) disorder characterized by the breakdown or loss of the myelin sheath surrounding nerve cells in the brain and progressive dysfunction of the adrenal gland. Adrenoleukodystrophy (ALD) is one of a group of genetic disorders called the leukodystrophies that cause damage to the myelin sheath of the nerve fibers in the brain. The myelin sheath is a fatty covering which acts as an electrical insulator. There are several forms of ALD: {{}}The classic childhood form, which is the most severe and affects only boys, may occur between ages 4 and 10. It affects only boys because the gene is on the X chromosome. Features of this form may include visual loss, learning disabilities, seizures, dysarthria (poorly articulated speech), dysphagia (difficulty swallowing), deafness, disturbances of gait and coordination, fatigue, intermittent vomiting, melanoderma (increased skin pigmentation), and progressive dementia. The most common symptoms are usually behavioral changes such as abnormal withdrawal or aggression, poor memory, and poor school performance. Women carriers: Another form of ALD is occasionally seen in women who are carriers of the disorder. Symptoms are mild and may include spastic paraparesis of the lower limbs, ataxia, hypertonia (excessive muscle tone), mild peripheral neuropathy, and urinary problems. The milder adult-onset form typically begins between ages 21 and 35. Symptoms may include leg stiffness, progressive spastic paraparesis (stiffness, weakness and/or paralysis) of the lower extremities, and ataxia. Although adult-onset ALD progresses more slowly than the classic childhood form, it can also result in deterioration of brain function. Neonatal (newborn) ALD affects both male and female babies. Symptoms may include mental retardation, facial abnormalities, seizures, retinal degeneration, hypotonia (low muscle tone), hepatomegaly (enlarged liver), and adrenal dysfunction. This form is usually quickly progressive. The treatment for all forms of ALD is symptomatic and supportive. Physical therapy, psychological support, and special education may be useful for some individuals. The prognosis for patients with ALD is generally poor due to progressive neurological deterioration. Death usually occurs within 1 to 10 years after the onset of symptoms.
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An X-linked recessive disorder affecting young males, characterized by chronic adrenocortical insufficiency, skin hyperpigmentation, progressive dementia, spastic paralysis, and other intellectual and neurologic disturbances; due to myelin degeneration in the white matter of the brain. The causative gene maps to Xq and encodes a. protein (ALDP), an ATP-binding transporter located in the peroxisomal membrane.

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adre·no·leu·ko·dys·tro·phy or chiefly Brit adre·no·leu·co·dys·tro·phy -.lü-kō-'dis-trə-fē n, pl -phies a rare demyelinating disease of the central nervous system that is inherited as an X-linked recessive trait chiefly affecting males in childhood and that is characterized by progressive blindness, deafness, tonic spasms, and mental deterioration abbr. ALD called also encephalitis periaxialis diffusa, Schilder's disease, Schilder's encephalitis

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n.
a genetically determined condition of neurological degeneration with childhood and adult forms. It is characterized by progressive spastic paralysis of the legs and sensory loss, associated with adrenal gland insufficiency and small gonads. The demonstration of abnormal fatty-acid metabolism has implications for future possible drug therapies. prenatal diagnosis is possible.

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adre·no·leu·ko·dys·tro·phy (ə-dre″no-loo″ko-disґtrə-fe) an X-linked recessive disease of childhood (gene locus: Xq28), in which deficient peroxisomal fatty acid degradation results in the accumulation of very long chain fatty acids in the tissues. It is marked by progressive adrenal dysfunction and diffuse abnormality of the cerebral white matter, with neurologic degeneration leading to severe dementia and deterioration of speech, vision, hearing, and gait. Death occurs within a few years of onset. Called also Addison-Schilder disease.

Medical dictionary. 2011.

Look at other dictionaries:

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  • adrenoleukodystrophy — noun Date: 1976 a rare demyelinating disease of the central nervous system that is inherited as a sex linked recessive trait chiefly affecting males in childhood and that is characterized by progressive blindness, deafness, tonic spasms, and… …   New Collegiate Dictionary

  • adrenoleukodystrophy — noun A degenerative genetic disease in which myelin is lost from nerve cells in the brain …   Wiktionary

  • adrenoleukodystrophy — ad·re·no·leu·ko·dys·tro·phy …   English syllables

  • adrenoleukodystrophy — n. a genetically determined condition of neurological degeneration with childhood and adult forms. Inherited as an X linked (see sex linked) trait resulting in demyelination, it is characterized by progressive spastic paralysis of the legs and… …   The new mediacal dictionary

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  • Addison-Schilder disease — adrenoleukodystrophy …   Medical dictionary

  • ALDP — adrenoleukodystrophy protein …   Medical dictionary

  • АДРЕНОЛЕЙКОДИСТРОФИЯ — (adrenoleukodystrophy) наследственное заболевание, приводящее к различным неврологическим нарушениям как у детей, так и у взрослых. Проявляется в виде прогрессирующего спастического паралича ног и потери их чувствительности, недостаточности… …   Толковый словарь по медицине

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