Journal Article

A very long-chain acyl-CoA synthetase-deficient mouse and its relevance to X-linked adrenoleukodystrophy

Ann K. Heinzer, Paul A. Watkins, Jyh-Feng Lu, Stephan Kemp, Ann B. Moser, Yuan Yuan Li, Stephanie Mihalik, James M. Powers and Kirby D. Smith

in Human Molecular Genetics

Volume 12, issue 10, pages 1145-1154
Published in print May 2003 | ISSN: 0964-6906
Published online May 2003 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddg126
A very long-chain acyl-CoA synthetase-deficient mouse and its relevance to X-linked adrenoleukodystrophy

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X-linked adrenoleukodystrophy (X-ALD) is a neurodegenerative and endocrine disorder resulting from mutations in ABCD1 which encodes a peroxisomal membrane protein in the ATP binding cassette superfamily. The biochemical signature of X-ALD is increased levels of saturated very long-chain fatty acids (VLCFA; carbon chains of 22 or more) in tissues and plasma that has been associated with decreased peroxisomal very long-chain acyl-CoA synthetase (VLCS) activity and decreased peroxisomal VLCFA β-oxidation. It has been hypothesized that ABCD1, which has no demonstrable VLCS activity itself, has an indirect effect on peroxisomal VLCS activity and VLCFA β-oxidation by transporting fatty acid substrates, VLCS protein or some required co-factor into peroxisomes. Here we report the characterization of a Vlcs knockout mouse that exhibits decreased peroxisomal VLCS activity and VLCFA β-oxidation but does not accumulate VLCFA. The XALD/Vlcs double knockout mouse has the biochemical abnormalities observed in the individual knockout mice but does not display a more severe X-ALD phenotype. These data lead us to conclude that (1) VLCFA levels are independent of peroxisomal fatty acid β-oxidation, (2) there is no ABCD1/VLCS interaction and (3) the common severe forms of X-ALD cannot be modeled by decreasing peroxisomal VLCS activity in the XALD mouse.

Journal Article.  7728 words.  Illustrated.

Subjects: Genetics and Genomics

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