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(Circulation Research. 2006;99:389.)
© 2006 American Heart Association, Inc.

Molecular Medicine

Specific Mutations in ABCA1 Have Discrete Effects on ABCA1 Function and Lipid Phenotypes Both In Vivo and In Vitro

Roshni R. Singaraja, Henk Visscher, Erick R. James, Angeliki Chroni, Jonathan M. Coutinho, Liam R. Brunham, Martin H. Kang, Vassilis I. Zannis, Giovanna Chimini, Michael R. Hayden

From the Center for Molecular Medicine and Therapeutics (R.R.S., H.V., E.R.J., J.M.C., L.R.B., M.H.K., M.R.H.), University of British Columbia and Child and Family Research Institute, Vancouver, British Columbia, Canada; the Whitaker Cardiovascular Institute (A.C., V.I.Z.), Boston University School of Medicine, Boston, Mass; and Institut Nationale de la Santé et de la Recherche Médicale/Centre Nationale de Recherche Scientifique et Universite de La Mediterranee (G.C.), Marseille, France.

Correspondence to Dr. Michael R. Hayden, Center for Molecular Medicine and Therapeutics, 950 W 28th Ave, Vancouver, British Columbia, V5Z 4H4, Canada. E-mail mrh{at}cmmt.ubc.ca

Mutations in ATP-binding cassette transporter A1 (ABCA1) cause Tangier disease and familial hypoalphalipoproteinemia, resulting in low to absent plasma high-density lipoprotein cholesterol levels. However, wide variations in clinical lipid phenotypes are observed in patients with mutations in ABCA1. We hypothesized that the various lipid phenotypes would be the direct result of discrete and differing effects of the mutations on ABCA1 function. To determine whether there is a correlation between the mutations and the resulting phenotypes, we generated in vitro 15 missense mutations that have been described in patients with Tangier disease and familial hypoalphalipoproteinemia. Using localization of ABCA1, its ability to induce cell surface binding of apolipoprotein A-I, and its ability to elicit efflux of cholesterol and phospholipids to apolipoprotein A-I we determined that the phenotypes of patients correlate with the severity and nature of defects in ABCA1 function.

Key Words: ABCA1 • basic research • cell culture • cholesterol homeostasis • HDL cholesterol • mutation • tissue culture

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