General Mitochondrial Trifunctional Protein (TFP) Deficiency as a Result of Either &agr;- or &bgr;-Subunit Mutations Exhibits Similar Phenotypes Because Mutations ... View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2004-02

AUTHORS

UTE SPIEKERKOETTER, ZAZA KHUCHUA, ZOU YUE, MICHAEL J. BENNETT, ARNOLD W. STRAUSS

ABSTRACT

The mitochondrial trifunctional protein (TFP) is a multienzyme complex of the beta-oxidation cycle. Human TFP is an octamer composed of four alpha-subunits harboring long-chain enoyl-CoA hydratase and long-chain L-3-hydroxyacyl-CoA dehydrogenase and four beta-subunits encoding long-chain 3-ketoacyl-CoA thiolase. Mutations in either subunit may result in general TFP deficiency with reduced activity of all three enzymes. We report five new patients with alpha-subunit mutations and compare general TFP deficiency caused by alpha-subunit mutations (n = 15) to that caused by beta-subunit mutations (n = 13) with regard to clinical features, enzyme activity, mutations, thiolase expression, and thiolase protein turnover. Among patients with alpha-subunit mutations, the same three heterogeneous phenotypes reported in patients with beta-subunit mutations were observed: a lethal form with predominating cardiomyopathy; an infancy-onset, hepatic presentation; and a milder, later-onset, neuromyopathic form. Maternal HELLP syndrome (hemolysis, elevated liver enzymes, low platelets) occurred with an incidence of 15 to 20%, as in families with beta-subunit mutations. Enzyme assays in fibroblasts revealed an identical biochemical pattern in both groups. alpha-Subunit mutational analysis demonstrated molecular heterogeneity, with 53% (9 of 17) truncating mutations. In contrast, patients with beta-subunit mutations had predominantly missense mutations. Thiolase expression in fibroblasts was as markedly reduced in alpha-subunit patients as in the beta-subunit group with similarly increased thiolase degradation, presumably secondary to TFP complex instability. TFP deficiency as a result of either alpha- or beta-subunit mutations presents with similar, heterogeneous phenotypes. Both alpha- and beta-subunit mutations result in TFP complex instability, demonstrating that the mechanism of disease is the same in alpha- or beta-mutation-derived disease and explaining the biochemical and clinical similarities. More... »

PAGES

190-196

Identifiers

URI

http://scigraph.springernature.com/pub.10.1203/01.pdr.0000103931.80055.06

DOI

http://dx.doi.org/10.1203/01.pdr.0000103931.80055.06

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1032052551

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/14630990


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46 schema:description The mitochondrial trifunctional protein (TFP) is a multienzyme complex of the beta-oxidation cycle. Human TFP is an octamer composed of four alpha-subunits harboring long-chain enoyl-CoA hydratase and long-chain L-3-hydroxyacyl-CoA dehydrogenase and four beta-subunits encoding long-chain 3-ketoacyl-CoA thiolase. Mutations in either subunit may result in general TFP deficiency with reduced activity of all three enzymes. We report five new patients with alpha-subunit mutations and compare general TFP deficiency caused by alpha-subunit mutations (n = 15) to that caused by beta-subunit mutations (n = 13) with regard to clinical features, enzyme activity, mutations, thiolase expression, and thiolase protein turnover. Among patients with alpha-subunit mutations, the same three heterogeneous phenotypes reported in patients with beta-subunit mutations were observed: a lethal form with predominating cardiomyopathy; an infancy-onset, hepatic presentation; and a milder, later-onset, neuromyopathic form. Maternal HELLP syndrome (hemolysis, elevated liver enzymes, low platelets) occurred with an incidence of 15 to 20%, as in families with beta-subunit mutations. Enzyme assays in fibroblasts revealed an identical biochemical pattern in both groups. alpha-Subunit mutational analysis demonstrated molecular heterogeneity, with 53% (9 of 17) truncating mutations. In contrast, patients with beta-subunit mutations had predominantly missense mutations. Thiolase expression in fibroblasts was as markedly reduced in alpha-subunit patients as in the beta-subunit group with similarly increased thiolase degradation, presumably secondary to TFP complex instability. TFP deficiency as a result of either alpha- or beta-subunit mutations presents with similar, heterogeneous phenotypes. Both alpha- and beta-subunit mutations result in TFP complex instability, demonstrating that the mechanism of disease is the same in alpha- or beta-mutation-derived disease and explaining the biochemical and clinical similarities.
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