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Mutation and biochemical analysis in carnitine palmitoyltransferase type II (CPT II) deficiency.

Abstract：

:Carnitine palmitoyltransferase type II (CPT II) deficiency has three basic phenotypes, late-onset muscular (mild), infantile/juvenile hepatic (intermediate) and severe neonatal. We have measured fatty acid oxidation and CPT II activity and performed mutation studies in 24 symptomatic patients representing the full clinical spectrum of disease. Severe and intermediate phenotypes show a clear correlation with biochemical indices and genetic analysis revealed causative mutations in most patients. Studies of mild phenotypes suggest a more complex interaction, with higher residual fatty acid oxidation, a wider range of CPT II activity (10-60%) but little evidence of genotype-phenotype correlation. Residual CPT II mutant protein from myopathic patients shows thermal instability at 41 degrees C. The common 'polymorphisms' V3681 and M647V are strikingly overrepresented in the myopathic patients, the implication being that they may significantly influence the manifestation of clinical disease and could therefore potentially be considered as a susceptibility variants. Among myopathic individuals, males comprised 88% of patients, suggesting increased susceptibility to clinical disease. A small number of symptomatic patients appear to have significant residual CPT II activity (42-60%) The synergistic interaction of partial deficiencies of CPT II, muscle adenosine monophosphate deaminase and possibly other enzymes of muscle energy metabolism in the aetiology of episodic myopathy deserves wider consideration.

journal_name

J Inherit Metab Dis

journal_title

Journal of inherited metabolic disease

authors

Olpin SE,Afifi A,Clark S,Manning NJ,Bonham JR,Dalton A,Leonard JV,Land JM,Andresen BS,Morris AA,Muntoni F,Turnbull D,Pourfarzam M,Rahman S,Pollitt RJ

doi

10.1023/a:1025947930752

keywords:

subject

Has Abstract

pub_date

2003-01-01 00:00:00

pages

543-57

issue

6

eissn

0141-8955

issn

1573-2665

pii

5149902

journal_volume

26

pub_type

杂志文章

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