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Adrenoleukodystrophy (ALD) is a disease linked to the X chromosome. It is a result of fatty acid buildup caused by failure of peroxisomal fatty acid beta oxidation which results in the accumulation of very long chain fatty acids in tissues throughout the body.
Leukodystrophy is characterized by specific symptoms, including decreased motor function, muscle rigidity, and eventual degeneration of sight and hearing. While the disease is fatal, the age of onset is a key factor, as infants have a typical life expectancy of 2–8 years, while adults typically live more than a decade after onset.
Zellweger syndrome is a rare congenital disorder characterized by the reduction or absence of functional peroxisomes in the cells of an individual. [1] It is one of a family of disorders called Zellweger spectrum disorders which are leukodystrophies. Zellweger syndrome is named after Hans Zellweger (1909–1990), a Swiss-American pediatrician ...
L1 syndrome. L1 syndrome is a group of mild to severe X-linked recessive disorders that share a common genetic basis. The spectrum of L1 syndrome disorders includes X-linked complicated corpus callosum dysgenesis, spastic paraplegia 1, MASA syndrome, and X-linked hydrocephalus with stenosis of the aqueduct of Sylvius (HSAS). [1][2] It is also ...
The mortality rate of early infantile Krabbe disease is 90% before the age of two. Later onset of symptoms is associated with longer life expectancy, with older children generally surviving two to seven years after the initial diagnosis. [22] Krabbe disease occurs in about one in 100,000 births. [23]
Prognosis. fatal. Frequency. 1 in 40,000 births. Metachromatic leukodystrophy (MLD) is a lysosomal storage disease which is commonly listed in the family of leukodystrophies as well as among the sphingolipidoses as it affects the metabolism of sphingolipids.
Vague symptoms, which wax and wane, can cause delay in recognition of the presence of the disease. [55] Female dogs appear more affected than male dogs, though this may not be the case in all breeds. [ 55 ] [ 56 ] The disease is most often diagnosed in dogs that are young to middle-aged, but it can occur at any age from 4 months to 14 years. [ 55 ]
Alexander disease is a very rare autosomal dominant leukodystrophy, which are neurological conditions caused by anomalies in the myelin which protects nerve fibers in the brain. The most common type is the infantile form that usually begins during the first two years of life. Symptoms include mental and physical developmental delays, followed ...