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Circulation. 1995;92:1765-1769

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(Circulation. 1995;92:1765-1769.)
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Articles

Polymorphisms in the Lipoprotein Lipase Gene and Their Associations With Plasma Lipid Concentrations in 40-Year-Old Danish Men

Christian Gerdes, MD; Lars Ulrik Gerdes, MD; Peter Steen Hansen, MD, PhD; Ole Faergeman, MD, DMSc

From the Department of Internal Medicine and Cardiology A, Aarhus Amtssygehus University Hospital, Aarhus, Denmark.

Correspondence to Dr C. Gerdes, Department of Internal Medicine and Cardiology A, Aarhus Amtssygehus University Hospital, Tage Hansensgade 2, DK-8000 Aarhus C, Denmark.


*    Abstract
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*Abstract
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Background In some previous studies, HindIII and Pvu II restriction fragment length polymorphisms (RFLPs) in the lipoprotein lipase (LPL) gene were associated with coronary heart disease and plasma concentrations of HDL cholesterol and triglycerides. However, the populations studied were relatively small and heterogeneous in regard to age, sex, and ethnic background.

Methods and Results Associations of a HindIII (intron 8) and a Pvu II (intron 6) RFLP in the LPL gene with plasma concentrations of cholesterol, HDL cholesterol, non-HDL cholesterol, and triglycerides were studied in 457 randomly selected 40-year-old Danish men. The HindIII and the Pvu II sites were in strong linkage disequilibrium. The frequencies of the H+ and P+ alleles (+ denotes presence of cutting site) were 0.717 and 0.464, respectively. In multivariate analysis, there was a clear gene dosage effect of the H+ allele on HDL. The lowest HDL cholesterol concentration was in the H+H+ group, the highest concentration was in the H-H- group, and the H+H- group had intermediate HDL concentrations (P=.03). There was a similar, but not statistically significant gene dosage effect on triglyceride concentrations, with the highest value seen in the H+H+ group. There were no other associations between LPL RFLPs and lipoprotein components. In males reporting family history of premature ischemic heart disease, the H+H+ genotype was overrepresented (odds ratio, 2.75; 95% confidence interval, 1.37 to 5.53).

Conclusions The results suggest that genetic variation in or near the LPL gene plays a role in interindividual differences in HDL cholesterol concentration and in risk of atherosclerosis and ischemic heart disease in men.


Key Words: lipoproteins • cholesterol • triglycerides • genes • coronary disease


*    Introduction
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Lipoprotein lipase (LPL) is a key enzyme in the postprandial processing of triglycerides and therefore plays a central role in lipid metabolism.1 The LPL gene is located on chromosome 8p22,2 and the gene structure and cDNA sequence are known.3 4 5 The LPL gene is {approx}35 kb in length and contains 10 exons. In addition to major gene rearrangements and missense mutations, which cluster in exons 4, 5, and 6,6 several restriction fragment length polymorphisms (RFLPs) have been reported at the LPL locus,7 8 9 10 11 12 13 including a HindIII polymorphism in intron 8 and a Pvu II polymorphism in intron 6.

Several trials have been carried out to explore associations between LPL gene polymorphisms and lipoprotein phenotypes. Although the results are not consistent, the HindIII polymorphism is associated with hypertriglyceridemia,14 15 coronary heart disease,15 16 and variation in HDL cholesterol concentration.12 The Pvu II site is associated with variation in plasma triglyceride concentration.14 However, the populations studied have been rather small and heterogeneous in regard to ethnic background, age, and sex.

We present data on the association of a HindIII and a Pvu II polymorphism in the LPL gene with variation in plasma lipids in a population of men (n=462) of the same age who were well characterized regarding factors known to affect plasma lipid concentrations.


*    Methods
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Subjects
Genomic DNA was isolated from 464 Danish men randomly selected from the national register of all men born in 1948 and residing in the city of Aarhus, Denmark, in 1988. They made up 25% of the total 1948 cohort of men in Aarhus. They participated in a cardiovascular risk factor prevalence study (RisiKalk Projektet), and they were of Danish (n=451) or northern European (n=13) origin. HindIII and Pvu II genotypes (see later) were determined in 457 and 462 subjects, respectively. No subjects were taking lipid-lowering drugs. Subjects with diabetes mellitus (n=3) and subjects taking antihypertensive drugs (n=8) were excluded from the analyses of variation in plasma lipid concentrations.

Polymerase Chain Reactions
DNA was amplified by polymerase chain reaction (PCR) in a Perkins Elmer/Cetus Thermal Cycler Model 480. To amplify a 1.3-kb fragment containing the HindIII restriction site in intron 8 and a 858-bp fragment containing the Pvu II restriction site in intron 6 of the LPL gene, we used a modification of the method described by Ahn et al.17 The modifications for the HindIII site were 0.9 µmol/L each primer and 35 cycles. The modifications for the Pvu II site were 0.5 µmol/L each primer, annealing at 67°C and 33 cycles. Blind samples (reagents minus DNA) were included in each PCR reaction to exclude contamination.

Amplified products were digested overnight at 37°C with HindIII or Pvu II according to the manufacturer's recommendations (Boehringer Mannheim). After separation on 2% agarose gels, the resulting fragments were stained with ethidium bromide and visualized with an UV transilluminator.

After digestion with HindIII, the presence of the restriction site (H+ allele), resulted in fragments of 600 and 700 bp. The presence of the Pvu II site (P+ allele) yielded fragments of 256 and 592 bp.

Lipid Analysis
EDTA blood samples were drawn after an overnight (12-hour) fast. Plasma cholesterol, HDL cholesterol, and plasma triglyceride concentrations were measured by standard enzymatic methods (Boehringer Mannheim). As a combined measure for the cholesterol in the LDL and VLDL fractions of plasma, non-HDL cholesterol was calculated as plasma cholesterol minus HDL cholesterol.

Statistical Analyses
Allele frequencies for each polymorphic site were estimated by the gene-counting method. Polymorphism information content (PIC) was calculated to estimate the informativeness of each polymorphism.18 The distribution of single diallelic RFLPs was tested for Hardy-Weinberg equilibrium with a {chi}2 test. Haplotype frequencies were estimated by using the maximum likelihood procedure outlined by Hill,19 and the linkage disequilibrium parameter D was computed and tested as described.19

Triglycerides and body mass index (BMI; [weight/height2]) were loge transformed to obtain a normal distribution. Smoking status was categorized into groups of grams of tobacco per day: <=5, 5 to<15, 15 to 25, and >25 g. Alcohol consumption was categorized into groups of units alcohol per week: 0 to <10; 10 to <20; 20 to <40, and >40 units (1 unit is {approx}10 g ethanol). Physical activity was categorized into groups of hours of sports activity per week: 0 to <1; 1 to <3, and >=3 hours.

Because plasma lipid concentrations are influenced considerably by environment, we made a priori adjustments for important environmental factors. Variation in the biochemical traits (dependent variable) with respect to genotypes were therefore analyzed by constructing a general linear model (GLM) with genotype, BMI, smoking status, physical activity, and alcohol consumption as independent variables. This procedure is analogous to ANOVA on adjusted values. If the genotype-adjusted mean values of the dependent variable (eg, HDL cholesterol) indicated a gene dosage effect, tests for linear trend were performed by repeating the GLM analysis with the genotypes coded as 0/1/2, assuming a codominant effect. After each run, outliers from the model were identified (typically three to five subjects) and the analysis was repeated without these outliers to test the stability of the model. If the regression coefficients (and therefore the P value) were substantially altered by this procedure, the model was rejected. Possible effects of the genotypes on other covariates were tested by introducing corresponding terms of interactions into the model. All statistical analyses were done with the statistical software package SYSTAT 5.1 FOR THE MACINTOSH (SyStat Inc).


*    Results
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*Results
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Table 1Down presents the genotype and allele frequencies for each polymorphic site along with the PIC values. The distributions of both diallelic genotypes were in Hardy-Weinberg equilibrium (data not shown). The relative frequencies (±SEM) of the H+ and P+ alleles were 0.72±0.015 and 0.46±0.017, respectively. The estimates of PIC values show that the HindIII and Pvu II polymorphisms would be moderately informative for studies of association and linkage in this population.


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Table 1. Genotype, Allele Frequencies, and Polymorphism Information Content Values of RFLPs of the LPLGene

Plasma HDL cholesterol concentrations were statistically significantly different in the HindIII genotypes when a test for linear trend was done (Table 2Down), and the effect of the H+ allele on HDL cholesterol was -0.0442 per H+ allele. The effect of the H+ allele on plasma triglycerides indicated an opposite, but similar trend that was not statistically significant, with the highest values in the H+H+ genotype group. After identification and exclusion of outliers, no significant alterations in the regression coefficients were observed. There were no significant interactions between the HindIII genotypes and other covariates. The regression model was therefore considered stable. No significant differences were found in total plasma cholesterol or non-HDL cholesterol between the HindIII genotype groups.


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Table 2. Lipoprotein Lipase HindIII and PvuII Genotypes and Plasma Lipid Levels

No statistically significant differences were found between the Pvu II genotype groups (Table 2Up).

Table 3Down presents the maximum likelihood estimates of the haplotype frequencies. The linkage disequilibrium parameter, D, shows that the HindIII and the Pvu II polymorphisms are in strong linkage disequilibrium.


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Table 3. Maximum Likelihood Estimates of Lipoprotein Lipase Haplotype Frequencies and Linkage Analysis

To study the association between haplotypes and HDL cholesterol, subjects were divided into quintiles with respect to HDL cholesterol after adjustment for BMI, smoking, alcohol intake, and physical activity. Allele frequencies and maximum likelihood haplotype frequencies were estimated in each quintile. Although there was no perfect trend, the H+ frequency decreased from the lowest to the highest HDL cholesterol quintile (Table 3Up). No such pattern was visible for the P+ data. Compared with the H+ data, the haplotypes showed a less perfect trend toward decreasing frequency of H+P- from the lowest to the highest quintile. No such pattern was apparent in the H+P+ haplotype frequencies. The frequency of H-P-, in contrast, showed a fairly clear increase with increasing HDL cholesterol. Furthermore, in the lowest quintile, H+P- was the most common of the four haplotypes, and this was the only quintile in which this was true. In the highest quintile, H+P- was the third most common of the four haplotypes, and this was the only quintile in which this was true. These data suggested that the association between H+ alleles and HDL cholesterol in large measure could be attributable to H+P- chromosomes, and we therefore compared directly the distributions of H+P- and H-P- between the lowest and the highest HDL cholesterol quintiles to "isolate" the effect on HDL cholesterol of having H+. The difference in H+P- and H-P- haplotype distribution between the lowest and highest quintiles (Table 4Down) was reflected in an odds ratio of 2.33 (95% confidence interval [CI], 1.32 to 4.10). In contrast, the odds ratio for overall H+ allele distribution (Table 4Down) was only 1.55 (95% CI, 0.98 to 2.46).


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Table 4. H+P- and H-P- Haplotype Distributions in the Lowest and Highest HDL Cholesterol Quintiles and Overall H+ Allele Distribution in the Lowest and Highest HDL Cholesterol Quintiles

There were significantly more men with the H+H+ genotype in the group reporting a positive family history of ischemic heart disease (myocardial infarction, angina pectoris, or both) before the age of 55 among first-degree relatives (odds ratio, 2.75; 95% CI, 1.37 to 5.53) (Table 5Down). When the age limit was extended to 65 years, the odds ratio dropped to 1.63 (95% CI, 1.02 to 2.63) (Table 5Down). When the numbers of alleles were counted, the odds ratios were 2.31 (95% CI, 1.24 to 4.28) and 1.25 (95% CI, 0.86 to 1.84), respectively.


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Table 5. Distribution of the H+ Allele in Men With and Without Self-Reported Family History of Ischemic Heart Disease (Myocardial infarction and/or Angina Pectoris) Before the Ages of 55 and 65

No statistically significant associations were found between Pvu II genotypes and family history of ischemic heart disease (data not shown).


*    Discussion
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*Discussion
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We believe that the criteria that can be outlined for interindividual comparability (ie, minimal ethnic heterogeneity, sample size, and knowledge of other factors with effects on plasma lipids) have been fulfilled in the present study.

Similar to previous findings in whites,12 14 16 17 20 our data show a strongly significant linkage disequilibrium between the HindIII and Pvu II polymorphic sites in intron 8 and 6, respectively, in the LPL gene. The frequency of the H+ allele of the HindIII site in the present study is also in accordance with previous reports on comparable populations, whereas the frequency of 0.464 of the P+ allele of the Pvu II site was lower than the frequencies of 0.52 to 0.58 previously reported.12 14 16 17 20

There was an effect of the HindIII polymorphism on the variation of plasma concentrations of HDL cholesterol (Tables 3Up and 4Up). The H+ allele of the HindIII site was significantly associated with lower concentrations of HDL cholesterol, and there was a clear gene dosage effect: the heterozygous subjects had HDL cholesterol concentrations intermediate between those of the two homozygous genotypes. There was an opposite, not statistically significant gene dose effect of the H+ allele on plasma triglyceride concentrations, reflecting the well known inverse relation between fasting concentrations of triglycerides and HDL cholesterol.21

Our results on the HindIII association with HDL and triglyceride concentrations are in accordance with those of Ahn et al,17 who found a statistically significant effect of the H+ allele on both HDL and triglycerides in non-Hispanic white men (n=44). Mattu et al16 reported a nonsignificant trend toward higher triglycerides and lower HDL cholesterol associated with the H+ allele in healthy men (n=123), and Peacock et al20 showed that the H+ allele was statistically significantly associated with higher triglyceride concentrations in young healthy Swedish men (n=93; mean age, 40.5 years). In contrast to Mattu et al,16 who found that the H+ allele was associated with higher plasma cholesterol, we could not demonstrate any significant effect of the H+ allele on total plasma cholesterol or non-HDL cholesterol. Also in contrast to Mattu et al, we could not demonstrate any significant effect of the P+ allele of the Pvu II site on HDL cholesterol, although there was a trend toward lower HDL associated with the P+ allele. This could be due to the differences in ethnicity, as reflected in the different allele frequencies.

The catabolism of VLDL and chylomicrons by LPL22 results in formation of IDL and chylomicron remnants (CRs), which are both depleted of triglyceride and enriched in cholesteryl esters (CEs). The latter is mediated via CE transfer protein (CETP), which transfers CE from HDL and LDL to triglyceride-rich particles in exchange for triglycerides.23 24 On further lipolysis, IDL becomes LDL, which can be cleared from the circulation via the LDL receptor. Apart from its lipolytic function, LPL binds to and travels with CR to the liver, where it enhances the clearance of these lipoproteins via the LDL receptor–related protein.25 In the liver, hepatic lipase also acts on the triglycerides in triglyceride-enriched HDL and LDL, and the fatty acids are resecreted from the liver as triglycerides in VLDL. Dysfunctional LPL could therefore theoretically affect lipoproteins by a variety of mechanisms.

Low HDL concentrations, particularly HDL2, are inversely related to coronary artery disease26 and to fasting plasma concentrations of triglycerides.21 The relation of low HDL to coronary heart disease could be mediated by a concomitant increased concentration of atherogenic triglyceride-rich lipoproteins.1 27 28 Delayed postprandial clearance of triglyceride-rich particles (called by Patsch et al "decreased triglyceride metabolic capacity") results in increased CETP-mediated transfer of CEs from HDL to CRs and IDL in exchange for triglycerides.1 23 24 29 30 31 This leads to a decrease in HDL cholesterol and cholesterol enrichment of the remnant particles, making the latter more atherogenic.1 27

The half-time of HDL in plasma exceeds that of chylomicrons by a factor of {approx}1000 and that of VLDL by a factor of {approx}50.28 32 33 34 35 36 37 An HDL particle is therefore exposed to and interacts with numerous generations of triglyceride-rich lipoproteins, and HDL serves as an integrative marker of triglyceride metabolic capacity.31 Fasting triglyceride concentrations, on the contrary, do not necessarily provide equally accurate information on triglyceride metabolic capacity.29 Therefore, as suggested by Patsch et al, HDL can be regarded as "the memory box of triglyceride metabolism."28

In genetic epidemiological studies like the present one, the effects of genetic polymorphisms on, for example, plasma lipid concentrations are generally small.38 This could explain why we could detect a statistically significant effect of the H+ allele on HDL cholesterol, which has a relatively small variance, but could not demonstrate a significant effect on fasting triglyceride concentrations, which have a much larger variance. We therefore believe that the effect of H+ alleles on HDL cholesterol concentrations is mediated through triglyceride metabolism.

The effect of the H+ allele on HDL cholesterol concentrations presented here therefore suggests that the HindIII site in intron 8 of the LPL gene is in linkage disequilibrium with one or more regions in or in close proximity to the LPL gene, affecting the lipolytic function of LPL6 and/or the clearance of triglyceride-rich lipoproteins6 and their remnants25 and thereby generating an atherogenic lipid phenotype. Maximum likelihood estimates of haplotype frequencies showed that the H+P- haplotype was enriched in the quintile with the lowest HDL cholesterol relative to the quintile with the highest HDL cholesterol and that no major difference in the frequencies of H+P+ was found between the highest and lowest quintiles. This suggests that the responsible mutation or functional polymorphism could be located on H+P- chromosomes and that the mutation/polymorphism could have occurred on an H+ chromosome before the mutation causing the Pvu II site variation.

We, like others,15 16 found the H+ allele to be associated with risk of ischemic heart disease. In persons reporting a positive family history of premature ischemic heart disease before age 55 among first-degree relatives, the H+ allele was overrepresented with an odds ratio of 2.75 (95 CI, 1.37 to 5.53), which is higher than the comparable odds ratio of 1.8 (95% CI, 1.09 to 2.98) for the Xba I allele of a restriction fragment length polymorphism in the apolipoprotein B gene in the same population.39

In conclusion, the present results suggest that genetic variation in or near the LPL gene plays a role in interindividual differences in HDL cholesterol concentration and in the risk of atherosclerosis and ischemic heart disease in men.


*    Acknowledgments
 
This work was supported by grants from the Danish Heart Foundation and the Research Fund of the Danish Society of Insurance Companies. The authors thank Pia Hornbek, Gitte Glistrup Nielsen, and Anette Stenderup for their excellent technical assistance.

Received February 2, 1995; revision received April 10, 1995; accepted April 16, 1995.


*    References
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up arrowAbstract
up arrowIntroduction
up arrowMethods
up arrowResults
up arrowDiscussion
*References
 
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2. Sparkes RS, Zollman S, Klisak I, Kirchgessner TG, Komaromy MC, Mohandas T, Schrag JD, Lusis AJ. Human genes involved in lipolysis of plasma lipoproteins: mapping of loci for lipoprotein lipase to 8p22 and hepatic lipase to 15q21. Genomics. 1987;1:138-144. [Medline] [Order article via Infotrieve]

3. Wion KL, Kirchgessner TG, Lusis AJ, Schotz MC, Lawn MR. Human lipoprotein lipase complementary DNA sequence. Science. 1987;235:1638-1641. [Abstract/Free Full Text]

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6. Fojo SS. Genetic dyslipoproteinemias: role of lipoprotein lipase and apolipoprotein CII. Curr Opin Lipid. 1992;3:186-195.

7. Li S, Oka K, Galton D, Stocks J. Bst-1 RFLP at the human lipoprotein lipase (LPL) gene locus. Nucleic Acids Res. 1988;16:11856. [Free Full Text]

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11. Hegele RA, Nakamura Y, Emi M, Lalouel JM, White R. A BglII RFLP at the lipoprotein lipase gene. Nucleic Acids Res. 1989;17:8899. [Free Full Text]

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Arterioscler. Thromb. Vasc. Bio.Home page
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Arterioscler. Thromb. Vasc. Bio.Home page
H. Knoblauch, A. Busjahn, S. Munter, Z. Nagy, H.-D. Faulhaber, H. Schuster, and F. C. Luft
Heritability Analysis of Lipids and Three Gene Loci in Twins Link the Macrophage Scavenger Receptor to HDL Cholesterol Concentrations
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P.S. Hansen, J.C. Defesche, J.J.P. Kastelein, L.U. Gerdes, L. Fraza, C. Gerdes, F. Tato, H.K. Jensen, L.G. Jensen, I.C. Klausen, et al.
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