Inherited apolipoprotein A-V deficiency in severe hypertriglyceridemia.
Arterioscler Thromb Vasc Biol
; 25(2): 411-7, 2005 Feb.
Article
em En
| MEDLINE
| ID: mdl-15591215
OBJECTIVE: Mutations in LPL or APOC2 genes are recognized causes of inherited forms of severe hypertriglyceridemia. However, some hypertrigliceridemic patients do not have mutations in either of these genes. Because inactivation or hyperexpression of APOA5 gene, encoding apolipoprotein A-V (apoA-V), causes a marked increase or decrease of plasma triglycerides in mice, and because some common polymorphisms of this gene affect plasma triglycerides in humans, we have hypothesized that loss of function mutations in APOA5 gene might cause hypertriglyceridemia. METHODS AND RESULTS: We sequenced APOA5 gene in 10 hypertriglyceridemic patients in whom mutations in LPL and APOC2 genes had been excluded. One of them was found to be homozygous for a mutation in APOA5 gene (c.433 C>T, Q145X), predicted to generate a truncated apoA-V devoid of key functional domains. The plasma of this patient was found to activate LPL in vitro less efficiently than control plasma, thus suggesting that apoA-V might be an activator of LPL. Ten carriers of Q145X mutation were found in the patient's family; 5 of them had mild hypertriglyceridemia. CONCLUSIONS: As predicted from animal studies, apoA-V deficiency is associated with severe hypertriglyceridemia in humans. This observation suggests that apoA-V regulates the secretion and/or catabolism of triglyceride-rich lipoproteins. Mutations in APOA5 gene might be the cause of severe hypertriglyceridemia in subjects in whom mutations in LPL or APOC2 genes have been excluded. We detected a nonsense mutation in APOA5 gene (Q145X) in a boy with hyperchylomicronemia syndrome. This is the first observation of a complete apoA-V deficiency in humans.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Apolipoproteínas
/
Mutação Puntual
/
Mutação de Sentido Incorreto
/
Hiperlipoproteinemia Tipo IV
Tipo de estudo:
Prognostic_studies
Limite:
Child
/
Humans
/
Male
País/Região como assunto:
Africa
/
Europa
Idioma:
En
Revista:
Arterioscler Thromb Vasc Biol
Assunto da revista:
ANGIOLOGIA
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Itália
País de publicação:
Estados Unidos