We report a large family in which four members showed a plasma lipid profile consistent with the clinical diagnosis of familial combined hyperlipidemia (FCHL). One of these patients was found to have markedly reduced HDL cholesterol (HDL-C) (0.72 mmol/l) and Apo A-I (72 mg/dl) levels, a condition suggestive of the presence of a mutation in one of the HDL-related genes. The analysis of APOA1 gene revealed that this patient was heterozygous for a cytosine insertion in exon 3 (c.49-50 ins C), resulting in a frame-shift and premature stop codon at position 26 of pro-Apo A-I (Q17PFsX10). This novel mutation, which prevents the synthesis of Apo A-I, was also found in four family members, including three siblings and the daughter of the proband. Carriers of Apo A-I mutation had significantly lower HDL-C and Apo A-I than non-carriers family members (0.77 ± 0.15 mmol/l vs. 1.15 ± 0.20 mmol/l, P < 0.005; 71.4 ± 9.1 mg/dl vs. 134.0 ± 14.7 mg/dl, P < 0.005, respectively). Two of the APOA1 mutation carriers, who were also heavy smokers, had fibrous plaques in the carotid arteries causing mild stenosis (20%). The intimal-media thickness in the two other adult carriers was within the normal range. The other non-carriers family members with FCHL had either overt vascular disease or carotid atherosclerosis at ultrasound examination. This observation suggests that the low HDL-C/low Apo A-I phenotype may result from a genetic defect directly affecting HDL metabolism, even in the context of a dyslipidemia which, like FCHL, is associated with low plasma HDL-C.
A novel mutation of the apolipoprotein A-I gene in a family with familial combined hyperlipidemia / L. Pisciotta, T. Fasano, L. Calabresi, A. Bellocchio, R. Fresa, C. Borrini, S. Calandra, S. Bertolini. - In: ATHEROSCLEROSIS SUPPLEMENTS. - ISSN 1567-5688. - 198:1(2008 May), pp. 145-151.
|Titolo:||A novel mutation of the apolipoprotein A-I gene in a family with familial combined hyperlipidemia|
|Parole Chiave:||APOA1 gene mutation; Cardiovascular disease; Familial combined hyperlipidemia; HDL deficiency|
|Settore Scientifico Disciplinare:||Settore BIO/14 - Farmacologia|
|Data di pubblicazione:||mag-2008|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/j.atherosclerosis.2007.09.017|
|Appare nelle tipologie:||01 - Articolo su periodico|