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Gly972Arg variant in the insulin receptor substrate-1 gene and association with Type 2 diabetes: a meta-analysis of 27 studies

Diabetologia volume 46, pages 990–995 (2003)Cite this article

Abstract

Aims/hypothesis

Several case-control studies have examined the association between the Gly972Arg variant in the IRS-1 gene and Type 2 diabetes, but most had limited power and results could therefore be conflicting.

Methods

We systematically reviewed the literature by means of a meta-analysis and investigated sources of heterogeneity in results of different studies.

Results

The summary risk ratio, based on 3408 cases and 5419 control cases from 27 studies, was 1.25 (95% CI 1.05–1.48). The results, however, differed according to the type of study, method of verifying non-diabetic status of the control subjects, and age of the case subjects. Population-based studies reported lower odds ratios than hospital-based studies (OR 0.98, 95% CI 0.74–1.30 vs OR 1.43, 95% CI 1.17–1.74). Also, the diagnostic test to exclude diabetes amongst control subjects interacted with the association between the IRS-1 Gly972Arg variant and Type 2 diabetes (p=0.03). Finally, the odds ratio reduced with increasing age (p=0.03).

Conclusion/interpretation

Overall, carriers of the 972Arg variant of the IRS-1 gene are at a 25% increased risk of having Type 2 diabetes compared with non-carriers. The odds ratios are generally higher in hospital-based studies, including relatively young, symptomatic, cases.

Insulin receptor substrate-1 (IRS-1) is the first substrate of the insulin receptor in the insulin signalling pathway [1]. Due to this central role, the IRS-1 function could be related to the development of Type 2 diabetes. Polymorphisms in the IRS-1 gene were identified for the first time in 1993 [2]. Since then, many case control studies have examined the association between the Gly972Arg variant and Type 2 diabetes [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26]. Results, however, are not consistent. It has been noticed that the heterozygous variant of the Gly972Arg polymorphism occurred more frequently in Type 2 diabetic subjects compared to control subjects (19% vs 7%) [2]. Based on seven studies published up to 1996 [2, 3, 4, 5, 8, 12], a combined odds ratio of 1.49 has been reported [12]. However, since then a number of other studies have been published in which no association was observed [15, 16, 17, 19, 20, 21, 22, 23]. Besides study power and other methodological issues, interaction with important diabetic risk factors such as body weight could have resulted in heterogeneous findings. Indeed, an association between the Arg-variant and insulin resistance in obese but not in lean subjects has been observed [27]. It has been suggested that excess body weight positively interacts with the Arg-variant thereby increasing the Type 2 diabetes risk [12].

The aim of our study was therefore to review the literature systematically by means of a meta-analysis, and to provide a quantitative summary estimate on the association between the Gly972Arg variant in the IRS-1 gene and the prevalence of Type 2 diabetes. In addition, sources of heterogeneity between studies were examined.

Subjects and methods

Search strategy

Studies were identified through a computerized Medline, Current Contents and Science Citation Index search on studies published until January 2002 using the free text words: diabetes, insulin receptor substrate, IRS-1, genotype, variant, Gly972Arg, and polymorphism. References in relevant publications were also examined. There were no language restrictions. For inclusion in this analysis, the publications had to give information about the prevalence of the Gly972Arg polymorphism in Type 2 diabetes patients and healthy non-familial control subjects. Another prerequisite was that sufficient data was given to calculate odds ratios. All investigations analysed in this meta-analysis have been carried out in accordance with the Declaration of Helsinki.

Data collection

For each study, information was collected concerning the characteristics of the subjects (age, sex, BMI, ethnicity, age of diagnosis), technique of the polymorphism (single strand conformation polymorphism analysis (SSCP) or direct enzyme digestion), type of study (hospital-based or population-based), and the diagnostic test used to exclude diabetes in control subjects (glucose tolerance test, fasting blood glucose measurement or no laboratory measurement). These study characteristics were used to evaluate sources of variation in effect estimates. All articles were independently scored by three reviewers (AJ, MZ, EF) similar to an earlier approach [28]. Disagreements were solved in consensus meetings. Assuming a dominant model of inheritance, homozygous mutants were combined with the heterozygous group. Unadjusted odds ratios were calculated using 2×2 contingency tables for each study, based on the Gly972Arg variant (wild-type vs heterozygous and homozygous mutant) and prevalence of Type 2 diabetes (present vs not present).

Authors of all publications were approached for additional information about the BMI of the subjects, high BMI (BMI >27 kg/m2) or low BMI (BMI ≤ 27 kg/m2). This additional information was provided by nine authors on ten study populations [8, 13, 15, 16, 17, 18, 19, 20, 23].

Study characteristics

We identified 44 articles published until January 2002 on the Gly972Arg polymorphism in Type 2 diabetic patients and control subjects. We excluded five studies because they examined the expression of the mutation instead of the prevalence [29, 30, 31, 32, 33]. We excluded seven studies because case subjects were relatives of Type 2 diabetic patients [34, 35, 36, 37] or were obese subjects [27, 38, 39] instead of Type 2 diabetic patients. An appropriate control group was missing in five studies [7, 40, 41, 42, 43], three studies did not provide clear data about prevalence rates [44, 45, 46] and two studies were excluded because odds ratios could not be calculated [24, 25]. Of the 22 included publications (Fig. 1), five provided separate associations in different populations [8, 15, 17, 19, 23]. These associations were considered as separate studies.

Fig. 1.
figure 1

Study characteristics and odds ratios of published articles concerning the effect of the Gly972Arg variant on the prevalence of Type 2 diabetes

Full size image

Of the studies five were population-based studies [5, 8, 19, 21] and 22 studies were hospital-based studies [2, 3, 4, 6, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 23, 26]. Seventeen studies included Caucasian subjects [2, 3, 4, 5, 8, 11, 12, 14, 15, 18, 19, 20, 22, 23, 26], eight studies included Asian subjects [6, 8, 9, 10, 13, 16, 17], and three studies black or South American subjects [15, 21, 23] (Fig. 1). Diagnostic tests to exclude diabetes in the control subjects were a single fasting blood glucose test in ten studies [2, 3, 8, 14, 18, 19, 20, 21, 22] and a glucose tolerance test in nine studies [5, 6, 8, 9, 10, 16, 17, 23]. In nine studies no diagnostic test has been used or reported [4, 11, 12, 13, 15, 23, 26]. SSCP analysis was used in three studies to determine the polymorphism [6, 15], fifteen studies used direct enzyme digestion [8, 10, 12, 14, 16, 17, 18, 19, 20, 21, 22, 26], and seven studies used both [2, 4, 5, 9, 11, 13, 23]. The method of analysis was not reported in three studies [3, 23].

Statistical analysis

To check for publication bias, a funnel plot was constructed. We examined funnel plot asymmetry visually and measured the degree of asymmetry using Egger's unweighted regression asymmetry test [47]. Studies were tested for Hardy-Weinberg equilibrium in the control group using Chi-square tests [48]. Summary odds ratios and corresponding 95% CI were estimated by random effects meta-regression analysis using the STATA 7.0 statistical software package [49]. To explore reasons for observed heterogeneity, we carried out sensitivity analyses on study characteristics and tested their influences on the association between the Gly972Arg variant and prevalence of Type 2 diabetes. A p value of 0.05 was considered statistically significant.

Results

Results from 27 studies with 3408 diabetic patients and 5419 non-related control subjects were included in this meta-analysis (Fig. 1). We could not identify heterogeneity visually (Fig. 2) or in terms of statistical significance (p=0.15), indicating no publication bias.

Fig. 2.
figure 2

Funnel plot for subjects with the Arg-variant versus subjects without this variant, unadjusted. Interrupted and uninterrupted reference lines indicate no effect and total summary odds ratio, respectively

Full size image

The allele frequencies of the control group of one study [5] were not in Hardy-Weinberg equilibrium. Calculations were done with and without this study. As results were similar, this study was not excluded.

Odds ratios of Type 2 diabetes for carriers compared to non-carriers of the Gly972Arg variant ranged from 0.55 to 4.75 (Fig. 1). The summary odds ratio was 1.25 (95% C.I. 1.05–1.48). The average proportion of carriers was 8.6% in healthy control subjects and 11.4% in diabetic patients. The overall population attributable risk was 2.1%.

We further examined if the association of the Gly972Arg variant with Type 2 diabetes did depend on ethnicity, type of study, or diagnostic test used to exclude diabetes presence, type of measurement of the polymorphism, prevalence of the polymorphism, and age of the cases. Heterogeneity was observed for type of study, diagnostic test used to exclude diabetes in the control subjects and age of the case subjects (Fig. 3).

Fig. 3.
figure 3

Crude summary odds ratios for the Gly972Arg variant and prevalence of Type 2 diabetes by ethnicity, type of study, test in controls and age of cases

Full size image

The summary odds ratio was 0.98 (95% C.I. 0.74–1.30) for population based studies, including 860 cases and 1,476 control subjects, compared with a summary odds ratio of 1.43 (95% C.I. 1.17–1.74) for clinical based studies including 2,548 cases and 3,943 controls (p=0.03). Studies using a glucose tolerance test to exclude diabetes showed a lower odds ratio compared with studies using a single fasting blood glucose test or no test at all (p=0.03). The summary odds ratio decreased with age of cases (p=0.03). Based on the regression equation the OR reduced from 1.87 (95% C.I. 1.24–2.82) for case subjects aged 35 to 45 years to 0.85 (95% C.I. 0.59–1.24) for case subjects that were 65 to 75 years old. The age of case subjects was lower in hospital-based studies compared with population-based studies (54.9±6.4 vs 65.2±8.2 years; p=0.045). There was no difference in the age of cases between studies that used a glucose tolerance test, fasting glucose determination or no test (60.5±7.6, 55.4±8.8, 55.3±5.7 years respectively, p=0.36). All population-based studies used a glucose tolerance test or fasting blood glucose determination to exclude diabetes among the control subjects. No test was done in six hospital-based studies. As the three modifiers (type of study, type of test to exclude diabetes, and age of case subjects) were highly interrelated it was not possible to assess the independent impact in the meta-regression analysis.

Although the odds ratio for studies with Caucasian subjects was slightly higher than that for studies with Asian subjects (Fig. 3), this difference was not statistically significant (p=0.26). The prevalence of the polymorphism and the analytical method to detect the polymorphism did not change the summary odds ratios.

Additional information on BMI was retrieved for ten studies. The summary odds ratio for these studies was 1.14 (95% C.I. 0.78–1.65). In studies with subjects with an average BMI greater than 27 kg/m2 (395 Type 2 diabetic subjects and 367 control subjects) or an average BMI less than or equal to 27 kg/m2 (788 diabetic patients and 1523 control subjects), no effect of the Arg-variant on the prevalence of Type 2 diabetes was found (OR 0.76, 95% C.I. 0.46–1.25 and OR 1.23 95% C.I. 0.75–2.01).

Discussion

Transfection studies with insulin receptor cells indicated that the Gly972Arg polymorphism of the IRS-1 gene impaired insulin-stimulated signalling [32]. A relationship between this polymorphism with the risk for Type 2 diabetes is therefore biologically plausible. Indeed, in our meta-analysis of 27 studies, including 3,408 diabetic patients and 5,419 control subjects, the summarized findings suggest an association between the presence of the Gly972Arg variant with Type 2 diabetes. In addition, several sources of heterogeneity between different studies were identified.

The summary odds ratio for population-based studies was lower than for hospital-based studies. This difference could be due to differences in phenotype. Cases detected in population-based studies include subjects with mild forms of diabetes, such as subjects newly diagnosed with diabetes after a single glucose tolerance test. Hospital-based studies generally include patients with more overt and symptomatic diabetes. These could be genetically different from those with newly diagnosed diabetes as individuals with milder glucose intolerance might not develop clinical or only at a high age [50]. Diabetes diagnosed at a younger age is thought to have a greater genetic predisposition [51]. We indeed observed an increasing odds ratio with a younger age of the case subjects. The age of case subjects was also lower in hospital-based studies compared with population based studies. This suggests that related differences in phenotype of the diabetic patients could account for the observed heterogeneity between population-based and hospital-based studies.

The difference in odds ratio found in population-based studies and hospital-based studies could also be due to the type of test, that was used. All included population-based studies used a fasting glucose concentration or a glucose tolerance test to classify subjects as controls. Hospital-based studies did not consistently use one test: in fact different types of tests (GTT, fasting or no test) were used evenly. Our results indicated that a more extensive test to detect diabetes in control subjects such as a glucose tolerance test resulted in a lower odds ratio. This could be due to the detection of a larger number of individuals with mild diabetes.

In general, a population-based design might be preferable in studies of non-related subjects as it is more likely that the control subjects are recruited from the same source population, avoiding selection bias [52]. This could be methodologically more sound compared to hospital-based studies with often only have a limited description of the control subjects and the selection process, leading to differential and non-differential misclassification of the control subjects. Both population-and hospital-based association studies have been criticized, because population admixture could be a source of confounding [53]. Family-based studies have been advocated as the preferred design for detecting genetic associations, because they check for population stratification. However, others have shown that there is only a relatively small effect from population stratification in a well-designed population association study [54].

Only one family-based study on the Gly972Arg polymorphism and Type 2 diabetes has been reported to date [55]. No association was found, although there was a trend in the same direction (OR 1.15 95% C.I. 0.71–2.03) as compared with our study. It is not clear from this study whether the results were different according to phenotype, because it included Type 2 diabetes patients as well as subjects with impaired glucose tolerance or a pre-diabetic state.

A major difficulty in identifying genes responsible for Type 2 diabetes is the definition of the phenotype [56]. This is also illustrated by the small population attributable risk of 2.1% in our study, due to the relatively low prevalence of the IRS-1 Arg972 variant. Since most individuals do not develop diabetes until later in life, a more appropriate phenotype might be insulin resistance or impaired insulin secretion. These metabolic abnormalities are identifiable even in the early stages of the natural history of Type 2 diabetes when glucose tolerance is normal. The Gly972Arg polymorphism has been associated with increased insulin resistance in obese subjects [27, 57, 58]. Human pancreatic islets from Arg972 carriers had reduced insulin content, altered insulin release, and a greater number of immature secretory granules [59]. As our results suggest that the IRS-1 Gly927Arg genotype is associated with a diabetes phenotype occurring at an earlier age, the importance of gene to gene interactions is also a matter that needs further elucidation [60].

In conclusion, this meta-analysis, including all available evidence to date, indicates that carriers of the 972Arg variant of the IRS-1 gene are at a 25% increased risk of having Type 2 diabetes compared with non-carriers, contributing to about 2% of the prevalence. The odds ratios are higher for hospital-based studies, including relatively young, symptomatic, cases. The contribution to specific subtypes of Type 2 diabetes could therefore be higher.

Abbreviations

IRS-1:

insulin receptor substrate-1

GTT:

glucose tolerance test

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Acknowledgements

The study was supported by a grant from Netherlands Organization for Scientific Research, grant number 980-10-006, Nutrition and Chronic Diseases. We would like to thank all authors from whom we received additional information concerning BMI of the subjects. We thank Dr. H.C. Boshuizen from the National Institute of for Public Health and the Environment, Centre for Information Technology and Methodology, for statistical advice.

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Authors and Affiliations

  1. Centre for Nutrition and Health, National Institute for Public Health and the Environment, Bilthoven, The Netherlands

    A. Jellema & E. J. M. Feskens

  2. Department of Human Biology, Maastricht University, P.O. Box 616, 6200 MD, Maastricht, The Netherlands

    A. Jellema & R. P. Mensink

  3. Department of Epidemiology, Maastricht University, Maastricht, The Netherlands

    M. P. A. Zeegers & P. C. Dagnelie

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  1. A. Jellema
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  2. M. P. A. Zeegers
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Jellema, A., Zeegers, M.P.A., Feskens, E.J.M. et al. Gly972Arg variant in the insulin receptor substrate-1 gene and association with Type 2 diabetes: a meta-analysis of 27 studies. Diabetologia 46, 990–995 (2003). https://doi.org/10.1007/s00125-003-1126-4

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  • DOI: https://doi.org/10.1007/s00125-003-1126-4

Keywords

  • IRS-1
  • Gly972Arg
  • obesity
  • Type 2 diabetes
  • meta-analysis