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Licensed Unlicensed Requires Authentication Published by De Gruyter September 21, 2011

Apolipoprotein E haplotyping by denaturing high-performance liquid chromatography

  • Maura Poli , Luisa Benerini Gatta , Roberto Dominici , Carlo Lovati , Claudio Mariani , Alberto Albertini and Dario Finazzi

Abstract

The apolipoprotein E ( APOE) gene in humans contains two single-base polymorphisms in exon 4, which result in three common alleles, conventionally named ε2, ε3 and ε4. Numerous studies have shown an important association between the ε4 variant and an increased risk of Alzheimer's disease; other data suggest a possible linkage of APOE genetic heterogeneity with lipid profile and an increased risk of atherothrombotic stroke and coronary heart disease. APOE genotyping is therefore an increasingly common assay in laboratory medicine. The most widely used technique for APOE genotyping is based upon restriction isotyping, i.e., amplification of the fragment of exon 4 containing the most common se-quence variations, followed by enzymatic digestion of the amplicon and fragments analysis by gel electrophoresis. We developed a novel, reliable and fast method that exploits the sensitivity and specificity of denaturing high-performance liquid chromatography in detecting single-nucleotide polymorphisms. We show that, in most cases, with a single chromatographic separation it is possible to correctly identify the six different APOE allelic patterns, without any manipulation after the polymerase chain reaction amplification. When compared to restriction isotyping, our method is much faster, less labor intensive and similarly inexpensive.


Corresponding author: Dario Finazzi, Section of Chemistry, Faculty of Medicine, University of Brescia, Viale Europa 11, 25123 Brescia, Italy Phone: +39-030-302356, Fax: +39-030-3717423, E-mail:

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Received: 2004-12-30
Accepted: 2005-3-14
Published Online: 2011-9-21
Published in Print: 2005-5-1

© by Walter de Gruyter Berlin New York

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