Lack of association between increased carotid intima-media thickening and decreased HDL-cholesterol in a family with a novel ABCA1 variant, G2265T.
Low HDL-cholesterol (HDL-C) concentrations are inversely correlated with cardiovascular disease, and previous studies have demonstrated that variants in the ATP-binding cassette transporter, ABCA1, are responsible for a proportion of HDL-C deficiency states. We identified a novel variant in ABCA1 in a kindred with decreased HDL-C. This variant was not identified in >200 chromosomes of healthy individuals. The proband, a heterozygote for G2265T, developed premature coronary artery disease. In addition to low HDL-C, six biological family members heterozygous for the ABCA1 variant exhibited low HDL-C concentrations compared with unaffected family members (0.83 +/- 0.32 vs 1.33 +/- 0.36 mmol/L; P = 0.009). Despite the decreased HDL-C, carotid artery B-mode ultrasound studies failed to reveal increased intima-media thickening in affected individuals compared with age- and sex-matched controls. Although these data extend previous observations that a single defective ABCA1 allele may lead to decreased HDL-C, associated evidence of early atherosclerosis was not confirmed.
Hong
Seung Ho
SH
Department of Medicine, University of Maryland and Veterans Administration Medical Center, Baltimore, MD 21201, USA.
Riley
Ward
W
Rhyne
Jeffrey
J
Friel
Gina
G
Miller
Michael
M
D064286:ATP Binding Cassette Transporter 1; D018528:ATP-Binding Cassette Transporters / Q000235:genetics*; D000328:Adult; D002339:Carotid Arteries / Q000473:pathology*; D008076:Cholesterol, HDL / Q000097:blood*; D003324:Coronary Artery Disease / Q000175:diagnosis* / Q000235:genetics / Q000473:pathology; D006801:Humans; D008297:Male; D009154:Mutation; D010375:Pedigree; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D017539:Tunica Intima / Q000473:pathology*
C577836:ABCA1 protein, human; D064286:ATP Binding Cassette Transporter 1; D018528:ATP-Binding Cassette Transporters; D008076:Cholesterol, HDL