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Association between insulin receptor substrate 1 gene polymorphism rs1801278 and gestational diabetes mellitus: an updated meta- analysis

Diabetology & Metabolic Syndrome volume 16, Article number: 62 (2024) Cite this article

Abstract

Objectives

we performed this meta- analysis to investigate the impact of insulin receptor substrate 1 (IRS1) gene rs1801278 on susceptibility to gestational diabetes mellitus (GDM).

Methods

The pooled odds ratio (OR) and 95% confidence interval (95% CI) were calculated, and p value is used to determine statistical significance. Sensitivity analysis was performed under three models (dominant, recessive and allele model), and the pooled ORs and 95%CI were calculated. Funnel plots and Begger’s regression test were employed to test the publication bias.

Results

The meta-analysis included 4777 participants (2116 cases and 2661 controls). The IRS1 rs1801278 (C/T) were not significant associated with GDM risk under the dominant and allele models, OR (95%CI) = 1.22 (0.88–1.70) and 1.24 (0.91–1.68), respectively (both p values were more than 0.05). But we also found the IRS1 rs1801278 (C/T) were significant associated with GDM risk under the recessive model, OR (95%CI) = 0.37 (0.16–0.86), p = 0.030. Our results showed that none of the studies affected the quality of the pooled OR. We also found no significant publication bias existed in this meta study for three genetic models, PTT + CT vs. CC = 0.445; PCC+CT vs. TT= 0.095; PC vs. T = 0.697.

Conclusion

this meta-analysis indicated that IRS1 rs1801278 (C/T) was associated with the GDM risk under the recessive model but was not associated with the GDM risk under dominant and allele models.

Introduction

Gestational diabetes (GDM) refers to abnormal glucose metabolism of different degrees that occurs or is first found during pregnancy, which is characterized by a potential defect in the response of pancreatic beta cells to insulin during pregnancy, which can have adverse effects on perinatal and maternal postpartum outcomes [1, 2]. In addition to these short-term risks, the risk of type 2 diabetes (T2DM) in women with a history of GDM during pregnancy will increase by 17–63% 5 to 16 years after delivery [3]. Both GDM and T2DM are characterized by insulin resistance, there are similarities in their pathogenesis [4], and there is a common genetic background between GDM and T2DM [5].

Insulin receptor substrate 1 (IRS1) gene, which located at chromosome 2q36, is a member of the IRS protein family. It also encodes IRS-1 protein, which plays an important role in signal transmission between insulin receptor and Phosphoinositide 3-kinase (PI3K) [6]. Previous studies have also shown that dysregulation of IRS-1 expression and function can affect the insulin signaling pathway, leading to the occurrence of IR and DM [7, 8]. Previously, several studies have suggested a significant association between IRS-1 gene single nucleotide polymorphisms (SNPs) and T2DM risk [9, 10]. Previous study [11] have confirmed that the substitution of glycine arginine in Gly972Arg (rs1801278) of IRS-1 gene has a statistical correlation with the high incidence rate of GDM. Several studies [12,13,14,15,16] were performed to investigate the relationship between rs1801278 and GDM susceptibility, however these studies concluded inconsistent results. Although, three meta- studies [17,18,19] have focused on this topic, and the fore- mentioned meta- analysis indicated that rs1801278 was associated with higher GDM risk, but in recent years, there have been new case-control studies [20,21,22] have been performed, and these new studies concluded inconsistent result with previous meta- analysis. Therefore, we performed this updated meta- analysis to investigate the relationship between IRS-1 gene (rs1801278) and susceptibility to GDM.

Methods

Publication search

We systematically searched articles published between 2004 and 2023 on databases of PubMed, Cochrane Library, Web of Science, Embase and China National Knowledge Infrastructure. The following terms were used: (“Gly972Arg” OR “Insulin receptor substrate 1” OR “Insulin receptor substrate” OR “rs1801278”) AND (“pregnancy-induced diabetes” OR “gestational diabetes mellitus” OR “gestational diabetes” OR “pregnancy-induced diabetes mellitus” OR “GDM”). Two staff members independently searched for articles and screened and extracted relevant information from their content.

Selection criteria

All included studies need to meet the following requirements: (1) evaluation the association between IRS-1 gene rs1801278 and susceptibility to GDM. (2) the studies included should be case-control studies and the full text could be obtained; (3) genotype frequencies for IRS-1 gene rs1801278 could be obtained. The rules for excluding research are as follows: (1) duplication of previous publications; (2) the study was not case- control study; (3) we could not obtain the genotype frequencies for IRS-1 gene rs1801278. PRISMA statement as the preferred reporting rule for this meta-analysis [23].

Data extraction

The process of literature review and data extraction will be independently conducted by two researchers based on literature selection criteria simultaneously. Information was extracted from these articles, including author, publication year, country, frequencies of IRS1 rs1801278 genotype and alleles in case and control group. Only articles with the largest sample amount, and the same data appears in multiple publications. To ensure the accuracy and objectivity of data extraction, the third researcher will verify the extracted data with the literature one by one. Any inconsistencies in the data will be publicly decided by the third researcher and the first two researchers together.

Study quality assessment

The two researchers conducted an independent quality assessment of each qualified article based on the NOS quantity table (NOS), which applied to the quality assessment of observation research. The third appraiser solves the different results of the two appraisers. The evaluation scores mainly include the following aspects: (1) Cases and control options (4 points); (2) the mass of confusion factor in cases and comparison with China correction (2 points); (3) exposure determination (3 points). The total score ranges from 0 to 9, and the score is higher than 6 for high quality.

Statistical analysis

The OR and 95% CI were calculated to estimate the relevance of IRS1 rs1801278 (C/T) gene and GDM risk. The Chi-square based Q-test and I-squared test were performed to analyze heterogeneous (P < recommended heterogeneity) [24, 25]. When there is no heterogeneity, estimate the combined OR using fixed effects models (Mantel Haenszel) or random effects models (DerSimonian and Laird) [26, 27]. Chi-square test was performed to examine Hardy–Weinberg equilibrium (HWE). Sensitivity analysis was performed for three models (dominant, recessive and allele model) to estimate the influence of the pooled ORs. The publication bias was tested by Funnel plot and Begg’s linear regression [28, 29], p < 0.05 was considered existing publication bias. Stata 15.0 was used for all analysis in this study. Two- sides p-values less than 0.05 were considered significant.

Results

Study characteristics

Figure 1 shows the process of literature search and inclusion. There were 75 publications searched in several electronic databases. After carefully reading the articles, a total of 67 studies were excluded, including 60 duplicate literatures, four meta- studies, two studies not involved in rs1801278 and one study have no sufficient data of rs1801278. Finally, a total of 8 articles were included in current meta-analysis. In these 8 case-control studies, 2 were conducted for Asian populations, 6 were Caucasian. The distribution of genotype for one study did not meet HWE balance (P < 0.05), but the distribution of genotype in controls of this study meet the HWE balance (P > 0.05). Table 1 shows the main characteristics and HWE test results of all included studies.

Fig. 1
figure 1

The flow sheet of identification of eligible studies

Full size image
Table 1 Information for studies included in this meta-analysis
Full size table

Meta-analysis results

The meta-analysis included 4777 participants (2116 cases and 2661 controls). The IRS1 rs1801278 (C/T) were not significant associated with GDM risk under the dominant and allele models, OR (95%CI) = 1.22 (0.88–1.70) and 1.24 (0.91–1.68), respectively (both p values were more than 0.05). But we also found the IRS1 rs1801278 (C/T) were significant associated with GDM risk under the recessive models, OR (95%CI) = 0.37 (0.16–0.86), p = 0.030 (Fig. 2).

Fig. 2
figure 2

Forest plots of the IRS1 rs1801278 (C/T) polymorphism under three genetic models (dominant, recessive and allele model)

Full size image

Sensitivity analysis

Sensitivity analyzes were performed by sequentially removing each eligible study one at a time to assess the effect of each study on the pooled OR. Our results showed that none of the studies affected the quality of the pooled OR (Fig. 3).

Fig. 3
figure 3

Sensitivity analysis examining the association between the IRS1 rs1801278 (C/T) and risk of gestational diabetes mellitus under three genetic models (dominant, recessive and allele model)

Full size image

Publication bias

Publication bias was evaluated using the Begg’s funnel plot. We found no significant publication bias existed in this meta study for three genetic models, PTT + CT vs. CC = 0.445; PCC+CT vs. TT= 0.095; PC vs. T = 0.697 (Fig. 4).

Fig. 4
figure 4

Begg’s funnel plot for publication bias analysis under three genetic models (dominant, recessive and allele model)

Full size image

Discussion

In current meta- study, we found that the IRS1 rs1801278 (C/T) were not significant associated with GDM risk under the dominant and allele models, but the IRS1 rs1801278 (C/T) were significant associated with GDM risk under the recessive models. Several studies [12,13,14,15,16] were performed to investigate the relationship between rs1801278 and GDM susceptibility, however these studies concluded inconsistent results. A case- control [12] study performed in Saudi women suggested that the IRS-1 rs1801278 variant may associated with increased risk of GDM under the dominant model. A study [13] for Greek population suggests that the risk of developing GDM is higher among female carriers of the minor allele within IRS1 gene rs1801278. But Shaat et al. [14] concluded inconsistent results, they found a negative result on relationship between IRS1 gene rs1801278 and GDM risk. Although, three meta- studies [17,18,19] have focused on this topic, and the three meta- analyses indicated that rs1801278 was associated with higher GDM risk, but in recent years, there have been new case-control studies [20,21,22] have been performed, and these new studies concluded inconsistent result with previous meta- analysis. Wu et al. [19] conducted a meta study suggested that GDM was associated with rs1801278(IRS1), but this relationship was not significant in Asian populations. In addition, the IRS1- rs1801278 was significantly affected by OGTT protocol and genotyping methods. Zhang et al. [17] indicated that the minor alleles of IRS1- rs1801278 (Gly972Arg) were significantly associated with a higher risk of GDM, and another meta- study concluded similar results. From then on, additional case- control studies were performed. Popova et al. [20] suggested that the distribution of genotype frequencies was not significant different between cases and controls. In 2021, Popova et al. [21] conducted another case- control study in Russian women and they obtained similar results. Wu et al. [22] performed a case- control study in Chinese females and found that there was no statistically significant difference in genotype frequency between the case and the control group.

Previous research [30, 31] suggests that IRS1 is a substrate of insulin receptor tyrosine kinase and plays a crucial role in insulin signaling pathways. IRS1 protein can be expressed in many insulins sensitive tissues, and its tyrosine phosphorylation can trigger activation of phosphatidylinositol 3-kinase (PI3K) and translocation of glucose transporter [32]. Evidence [14] have shown that the IRS1 G972R polymorphism reduces insulin content in isolated human islets and impairs insulin secretion function.

Several limitations existed in this meta-analysis. Firstly, we could not analyze the data grouped by ethnic, because just two studies were conducted in Asian. Secondly, the pathogenesis of GDM is very complex, including genetic factors, environmental factors and the synergistic effects. Therefore, this study only analyzes the association between a single SNP and GDM, without involving gene- environmental synergistic effects.

In conclusion, this meta-analysis indicated that IRS1 rs1801278 (C/T) was associated with the GDM risk under the recessive model but was not associated with the GDM risk under dominant and allele models.

Data availability

No datasets were generated or analysed during the current study.

Abbreviations

GDM:

Gestational diabetes mellitus

HWE:

Hardy–Weinberg equilibrium

IRS1:

Insulin receptor substrate 1

PRISMA:

Preferred Reporting Project

SNP:

Single nucleotide polymorphism

T2DM:

Type 2 diabetes

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Acknowledgements

We appreciate the cooperation of the partners and staffs cooperated in this study.

Funding

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, Heping Hospital Affiliated to Changzhi Medical College, 110 South Yan’an Road, 046000, Changzhi, Shanxi Province, China

    Lili Shen, Junli Liu, Xiaolei Zhao, Aiqin Wang & Xiaomei Hu

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  3. Xiaolei Zhao
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Contributions

Manuscript writing, editing and review were conducted by Lili Shen and Xiaomei Hu; Lili Shen, Xiaolei Zhao and Aiqin Wang participated in the articles search; Junli Liu and Xiaomei Hu performed data analysis and evaluation the quality of the selected studies.

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Correspondence to Lili Shen.

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Shen, L., Liu, J., Zhao, X. et al. Association between insulin receptor substrate 1 gene polymorphism rs1801278 and gestational diabetes mellitus: an updated meta- analysis. Diabetol Metab Syndr 16, 62 (2024). https://doi.org/10.1186/s13098-024-01289-w

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Keywords

Diabetology & Metabolic Syndrome

ISSN: 1758-5996

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