Targeted inactivation of the X-linked adrenoleukodystrophy gene in mice

Journal of Neuroscience Research
S Forss-PetterK A Nave

Abstract

In its severe form, X-linked adrenoleukodystrophy (ALD) is a lethal neurologic disease of children, characterized by progressive cerebral demyelination and adrenal insufficiency. Associated with a biochemical defect of peroxisomal beta-oxidation, very long-chain fatty acids (VLCFA) build up in tissues that have a high turnover of lipids, such as central nervous system (CNS) white matter, adrenal cortex, and testis. Whether the abnormal accumulation of VLCFA is the underlying cause of demyelination or merely an associated biochemical marker is unknown. ALD is caused by mutations in the gene for a peroxisomal membrane protein (ALDP) that shares structural features with ATP-binding-cassette (ABC) transporters. To analyze the cellular function of ALDP and to obtain an animal model of this debilitating disease, we have generated transgenic mice with a targeted inactivation of the ald gene. Motor functions in ALDP-deficient mice developed at schedule, and unexpectedly, adult animals appeared unaffected by neurologic symptoms up to at least 6 months of age. Biochemical analyses demonstrated impaired beta-oxidation in mutant fibroblasts and abnormal accumulation of VLCFAs in the CNS and kidney. In 6-month-old mutants, adrenal cortex ce...Continue Reading

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