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Frequency of low-density lipoprotein receptor gene mutations in patients with a clinical diagnosis of familial combined hyperlipidemia in a clinical setting.

Abstract：

OBJECTIVES:The purpose of this study was to determine the frequency of mutations in the low-density lipoprotein receptor (LDLR) and apolipoprotein B (APOB) genes in consecutive patients with a clinical diagnosis of familial combined hyperlipidemia (FCH) in a nonresearch setting. BACKGROUND:The lipid phenotype frequently overlaps in familial hypercholesterolemia (FH) and FCH. Detection of causative mutations in LDLR or APOB provides an unequivocal diagnosis of FH, but such genetic testing has not been systematically performed in FCH. METHODS:We used Lipochip (Progenika, Derio, Spain), a microarray that includes 203 causative mutations in LDLR and 4 APOB defects, to investigate 143 unrelated FCH patients. RESULTS:Mutations of LDLR were found in 28 patients (overall prevalence, 19.6%). No APOB defects were found. Compared with patients who had a normal LDLR gene, patients with mutations had lower waist circumference (p = 0.02); significantly (p < 0.005) higher total cholesterol, non-high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, and apoB; nonsignificantly (p = 0.063) lower triglycerides; and a lower frequency of diabetes mellitus (22% vs. 0%, respectively; p = 0.002). Total cholesterol and apoB levels showed the best receiver-operator characteristics curves in the prediction of LDLR mutations, with areas under the curve (95% CI: of 0.750 (95% confidence interval [CI]: 0.647 to 0.853) and 0.744 (95% CI: 0.636 to 0.851), respectively. Total cholesterol of 335 mg/dl and apoB of 185 mg/dl were the best thresholds for diagnosis of LDLR mutations. CONCLUSIONS:Screening for LDLR defects is advisable for patients with a clinical diagnosis of FCH showing high total cholesterol or apoB levels. Diagnostic criteria for FH should not exclude patients whose personal and familial lipid values appear to fit the clinical criteria of FCH.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Civeira F,Jarauta E,Cenarro A,García-Otín AL,Tejedor D,Zambón D,Mallen M,Ros E,Pocoví M

doi

10.1016/j.jacc.2008.06.050

subject

Has Abstract

pub_date

2008-11-04 00:00:00

pages

1546-53

issue

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(08)02799-X

journal_volume

pub_type

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Frequency of low-density lipoprotein receptor gene mutations in patients with a clinical diagnosis of familial combined hyperlipidemia in a clinical setting.