| Summary: | <p>Abstract</p> <p>Background</p> <p>ApolipoproteinA1(apoA1) is the major apoprotein constituent of high-density-lipoprotein(HDL). The relationship of apoA1 -75 bp(M1<sup>-</sup>) allele polymorphism with lipoprotein phenotype and cardiovascular diseae (CVD) remain unclear.</p> <p>Overnight fasting blood samples were collected from a cohort of high-risk Omani population, 90 non-diabetic subjects and 149 type 2 diabetes mellitus (T2DM) subjects for genotype and phenotype studies.</p> <p>Results</p> <p>The M1+ and M1- alleles frequencies were 0.808 and 0.192 for M1+ and M1-, respectively, comparable to the frequency of apoA1 (M1+ and M1-) amongst a healthy Omani population, 0.788 and 0.212, respectively.</p> <p>The frequencies of the hetero- and homozygous subjects for the MspI polymorphism at -75 (M1<sup>-</sup>) of the apoA1 gene were in Hardy-Weinberg equilibrium.</p> <p>The mean Lp(a) concentration was significantly higher(P = 0.02) in subjects carrying M1<sup>- </sup>allele compared to M1<sup>+ </sup>allele of the APOA1 gene with an odd ratio of 2.3(95% CI, 1.13–14.3), irrespective of gender and the diabetic status.</p> <p>Conclusion</p> <p>ApolipoproteinA1-75 G/A (M1<sup>-</sup>) polymorphism is relatively common and is positively associated with Lp(a) and therefore, may confer a potential risk for cardiovascular disease (CVD).</p>
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