MedGen

X-linked adrenoleukodystrophy (X-ALD) affects the nervous system white matter and the adrenal cortex. Three main phenotypes are seen in affected males: The childhood cerebral form manifests most commonly between ages four and eight years. It initially resembles attention-deficit disorder or hyperactivity; progressive impairment of cognition, behavior, vision, hearing, and motor function follow the initial symptoms and often lead to total disability within six months to two years. Most individuals have impaired adrenocortical function at the time that neurologic disturbances are first noted. Adrenomyeloneuropathy (AMN) manifests most commonly in an individual in his twenties or middle age as progressive stiffness and weakness of the legs, sphincter disturbances, sexual dysfunction, and often, impaired adrenocortical function; all symptoms are progressive over decades. "Addison disease only" presents with primary adrenocortical insufficiency between age two years and adulthood and most commonly by age 7.5 years, without evidence of neurologic abnormality; however, some degree of neurologic disability (most commonly AMN) usually develops by middle age. More than 20% of female carriers develop mild-to-moderate spastic paraparesis in middle age or later. Adrenal function is usually normal. [from GeneReviews]

A progressive peroxisomal disease, characterized by endocrine dysfunction (adrenal failure and sometimes testicular insufficiency), progressive myelopathy and peripheral neuropathy, and leukodystrophy. Age of onset is highly variable, but often in the first decade. [from ORDO]

The presence of a teratoma. [from HPO]

A mode of inheritance that is observed for traits related to a gene encoded on the X chromosome. [from HPO]

A group of congenital disorders of lipid metabolism, caused by loss of the normal peroxisomes. Signs and symptoms include developmental delays, mental retardation, facial abnormalities, hepatomegaly, and hypotonia. [from NCI]

This term describes abnormality of the white matter of the cerebrum resulting from damage to the myelin sheaths of nerve cells. [from HPO]

An X-linked intellectual deficiency in which not enough information is known, reported or published to indicate whether a gene causes non-syndromic or syndromic presentations. [from MONDO]

A form of the peroxisomal disease X-linked adrenoleukodystrophy, characterized by progressive myelopathy and peripheral neuropathy, and often associated with peripheral adrenal insufficiency in males. Onset is typically in adulthood. [from ORDO]

A broad group of disorders that affect the myelin sheaths that cover the neurons. Myelin sheathes cover neuronal axons in the central and peripheral nervous system and function to increase travelling impulse speeds. Disruption of this sheath impairs neuronal transmission and can result in disorders such as multiple sclerosis and Guillain-Barre syndrome, among others. [from NCI]

Insufficient production of steroid hormones (primarily cortisol) by the adrenal glands. [from HPO]

A group of neurologic disorders caused by alterations to the biochemical functioning of the brain. They are characterized by an altered level of consciousness and depressed cerebral functioning. [from NCI]

A rare, autosomal recessive inherited metabolic disorder characterized by high levels of pipecolic acid in the blood, leading to neuropathy and hepatomegaly. [from NCI]

Disorders of intracellular cobalamin metabolism have a variable phenotype and age of onset that are influenced by the severity and location within the pathway of the defect. The prototype and best understood phenotype is cblC; it is also the most common of these disorders. The age of initial presentation of cblC spans a wide range: In utero with fetal presentation of nonimmune hydrops, cardiomyopathy, and intrauterine growth restriction. Newborns, who can have microcephaly, poor feeding, and encephalopathy. Infants, who can have poor feeding and slow growth, neurologic abnormality, and, rarely, hemolytic uremic syndrome (HUS). Toddlers, who can have poor growth, progressive microcephaly, cytopenias (including megaloblastic anemia), global developmental delay, encephalopathy, and neurologic signs such as hypotonia and seizures. Adolescents and adults, who can have neuropsychiatric symptoms, progressive cognitive decline, thromboembolic complications, and/or subacute combined degeneration of the spinal cord. [from GeneReviews]