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Egyptian Journal of Medical Human Genetics
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rs3761548 (C/A) and rs5902434 (del/ATT) polymorphisms of Foxp3 gene in Iranian patients with migraine

Egyptian Journal of Medical Human Genetics volume 24, Article number: 18 (2023) Cite this article

Abstract

Background

Migraine is a neurovascular disorder; several studies have demonstrated the immune system plays a key role in migraine pathogenesis. The aim of this study was to investigate the association between FOXP3 gene polymorphism and susceptibility to migraine.

Methods

In a case–control study, 55 whole blood samples of patients with migraine and 80 healthy samples were collected. After DNA extraction, genotyping of the rs5902434 (del/ATT) and rs3761548 (C/A) FOXP3 was performed using sequence-specific primers method (PCR-SSP).

Results

The results of this study showed that there were statistically significant differences between patient and control group in genotype frequencies of rs3761548. In addition, the frequency of heterozygous genotype AC at rs3761548 in patients was found to be significantly higher than controls. We also found no significant differences between cases and controls were found in the allelic and genotype distribution of the rs5902434 (del/ATT) polymorphism. None of the rs5902434 (del/ATT) genotypes showed any significant association with the migraine.

Conclusions

According to finding of our study, polymorphism rs3761548 in FOXP3 gene were associated with susceptibility to migraine. Further studies with larger sample sizes and different populations in other parts of the world are needed to investigate relationship between this polymorphism on migraine susceptibility.

Introduction

Migraine is a neurovascular disorder that affects 10–20% of general population during periods of their lives [1], Based on the Global Burden of Disease (GBD) 2019 study, the global mean prevalence rate of migraine increased from 721.9 million (95% UI: 624.9–833.4) in 1990 to 1.1 billion (95% UI: 0.98–1.3) in 2019 [2]. A migraine attack can have a wide variety of symptoms may include throbbing pain, nausea and vomiting, phonophobia (sound sensitivity), photophobia (light sensitivity), stiffness of the neck and shoulders, diarrhea. Migraine attacks usually last from 4 to 72 h and migraine symptoms are often provoked by physical activity [3].

Although the underlying cause of migraines is unknown, a variety of factors, such as genetics and environmental factors can play a role in the development of migraine. Individual’s susceptibility to migraine may be determined by genetic factor, while environmental factors are related to its development [4].

Various studies have indicated that an immune system plays a key role in the pathophysiology of migraine. Elevated blood levels of pro- and anti-inflammatory cytokines such as TNF and interleukin 10 (IL-10) were observed during a migraine attack [5,6,7]. Furthermore, studies were performed on the relationship between the number of regulatory T cells (Treg cells) and the pathophysiology of migraine [8, 9]. Clinical study showed that a significant increase in CD4 + and a decrease in CD8+ levels was observed in migraine patients [10]. Also studies on the relationship between Treg population and migraine pathophysiology were done. Their results showed that the percentage of Treg cells in migraine patients was significantly lower than the control group. The results of these studies suggest that deregulated immunity may be involved in the pathophysiology of migraine [9].

Treg cells play an important role in prevents the development of autoimmune disease [11,12,13]. Forkhead box P3 (FOXP3) gene is located on the short arm of the human sex chromosome (X on XY model) (Xp11.23; 21 kb) [14]. FOXP3 gene provides instructions for producing the forkhead box P3 (FOXP3) protein. The protein encoded by this gene is a member of the forkhead/winged-helix family of transcriptional regulators that plays a vital role in the development and function of regulatory T cells [15, 16].

FOXP3 gene mutations can disrupt immune regulation and lead severe autoimmune diseases [17,18,19,20]. The polymorphisms in the FOXP3 promoter gene may change activity and production of FOXP3 [19, 21, 22]. Numerous research studies have been conducted to try to understand the relationship between FOXP3 gene polymorphisms and autoimmune diseases. The results of some of this research showed a positive association between FOXP3 gene polymorphisms and susceptibility to type1 diabetes [23] or rejection in kidney transplant recipients [24], systemic lupus erythematosus [20], vitiligo [25], autoimmune thyroid disease [26], recurrent permanent abortion [27] and multiple sclerosis [28]. Given that, there is debate about the role of autoimmunity in the pathophysiology of migraine [29]. The aim of this study was to investigate the association between rs3761548 (C/A) and rs5902434 (del/ATT) FOXP3 gene polymorphism and migraine susceptibility.

Materials and methods

Study population (patients and healthy controls)

In a case–control study 55 patients with headache complaints referred to neurology clinics and health centers in Arak University of Medical Sciences were evaluated by a neurologist according to the criteria from the International Classification of Headache Disorders were included [30]. For this study 80 age and sex matched healthy controls were enrolled, without headache history and immunological diseases. Written informed consent was obtained from all participants. The present study was approved by the Institutional Human Ethics Committees (IR.ARAKMU.REC.1397.238), Arak University of Medical Sciences, Iran. Degree of disability caused by migraine have been measured with Migraine Disability Assessment Scale (MIDAS).

Genotyping of rs3761548 (C/A) and rs5902434 (del/ATT)

2 ml whole blood samples were collected; genomic DNA was extracted from whole blood using DNA extraction kit (YektatajhizAzma, Tehran, Iran) according to manufacturer's instructions, and stored at – 20 °C until subsequent analysis. rs5902434 and rs3761548 genotype were analysed through sequence-specific primers method (PCR-SSP). PCR-SSP was performed in a total volume of 25 ml using 1 ml of genomic DNA (1 mg/ml), 12.5 ml Taq DNA polymerase MasterMix (Yektatajhiz co, Tehran, Iran), 1 ml of each primer (5 mM) and sterile distilled H2O. The PCR temperature cycling conditions were as follows: initial denaturation at 95 °C for 4 min followed by 30 cycles of denaturation at 94 °C for 30 s, annealing at 60 °C for 1 min and extension at 72 °C for 1 min and the final extension of 72 °C for 5 min. Primers used in this study are listed in Table 1. PCR products analysed by electrophoresis on 2% agarose gel then visualized by transilluminator device.

Table 1 Primers sets used for SNP genotyping analyses
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Statistical analysis

All statistical analyses were performed using the Statistical Package for Social Sciences version 10.0 (SPSS Inc., Chicago, IL, USA). Quantitative data were expressed as mean ± standard error of the mean and qualitative data were presented as number (percentage). A P-value less than 0.05 were considered statistically significant. The chi-squared tests were used for compare to frequency of allele, genotype distribution and categorical variable. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated by Logistic regression to estimate association between this SNP and disease susceptibility.

Results

In this study, a total of 135 individuals, including 55 with migraines and 80 healthy as a control group were examined. The demographic characteristics are presented in Table 2. No significant differences of age and gender were detected between cases and controls (p > 0.05).

Table 2 Demographical characteristics of migraine patients and healthy controls
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Association of FOXP3 polymorphisms with genetic susceptibility to migraine

Both polymorphisms were in Hardy–Weinberg equilibrium (HWE), (p > 0.05). Genotype and allele distributions of the rs5902434 and rs3761548 in migraine subjects and controls are shown in Table 3, p < 0.05 is considered statistically significant. For rs5902434, genotype frequency of TT, TA, AA in migraine patients were 29.1%, 65.5%, 5.5% and for healthy control were 21.3%, 75% and 3.8% respectively (Fig. 1). There was no statistically significant difference in genotype and allele frequency of rs5902434 polymorphisms between the patient and control group. None of the genotypes showed any significant association with the migraine (p = 0.48 and p = 0.61 respectively). However, there were statistically significant differences between patient and control group in genotype frequencies of rs3761548. The frequency of heterozygous genotype AC (n = 16, 29.1%) in patients was found to be significantly higher than in controls (p = 0.02, OR = 2.57, 95% CI 1.08–1.09). In addition, the A allele was significantly more frequent in patients (36.4%) than in healthy controls (14.4%), and associated with increased susceptibility to migraine development (p = 0.00, OR = 1.40, 95% CI 0.890–1.12) (Fig. 2).

Table 3 Genotype and allele frequencies of FOXP3 rs3761548 and rs5902434 patients and control subjects in Iranian population
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Fig. 1
figure 1

Agarose gel electrophoresis for detection of rs5902434polymorphism. Lane (M): molecular weight marker, lanes 1,2 TT genotype; lanes 3, 4: TA genotype and lanes 5,6: AA genotype

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Fig. 2
figure 2

Agarose gel electrophoresis for detection of rs3761548 polymorphism. Lane (M): molecular weight marker, lanes 1,2 AA genotype; lanes 3, 4: AC genotype and lanes 5,6: CC genotype

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Association of FOXP3 polymorphisms with clinical characteristics of patients with migraine

The results of the MIDAS questionnaire showed that the grade of disability due to headache was 15%patients (grade 1), 32.5%patients (grade 2), 30% patients (grade 3) and 22.5%patients (grade 4). Stratified analysis was performed to evaluate the associations between each genetic polymorphism and clinical characteristics. There were no significant associations between rs5902434 and rs3761548 with clinical features.

Discussion

Migraine is a complex neurobiological disorder and pathophysiological mechanisms of migraine are not completely understood [31]. Several studies have proved the role of immune system in the pathogenesis of migraine [9, 32]. According to finding of our study, polymorphism rs3761548 in FOXP3 gene were associated with susceptibility to migraine. Furthermore, in our study, showed that there is no correlation between polymorphism rs5902434 in of FOXP3 gene with migraine.

Associations between FOXP3 gene polymorphisms and several autoimmune diseases have been investigated in various studies. Wang et al. reported that of rs3761548C/A and rs2294021C/T polymorphisms were associated with the susceptibility to diabetes and diabetic nephropathy in the Han Chinese population [33]. In a case–control study by Hassannia et al., in 2011, the FOXP3 gene polymorphism at positions -3279 A>C and -924 A>G were evaluated in patients with allergic rhinitis (AR). Researchers report that there is a significant association between FOXP3 gene polymorphism and allergic rhinitis. FOXP3-3279 A alleles were associated with an increased risk of AR in an Iranian population [18]. In study by El-maadawy in 2022, showed that FOXP3 rs3761548CC and AA genotypes could be associated with an increased acute lymphoblastic leukemia (ALL) risk [34]. A 2013 study by Jahan et al. On patients with vitiligo showed that the polymorphism in rs3761548 of the FOXP3 gene may be associated with vitiligo susceptibility due to changes in expression. The CC genotype appears to be protective and the AC genotype appears to be approximately three times more likely to develop vitiligo in women group. Also, in another study of Iranian patient with multiple sclerosis (MS) revealed that the frequencies of AA and AC genotypes at rs3761548 in the FOXP3 gene were significantly higher in MS group as compared with healthy subjects [28]. In another investigation, Lan et al. reported that FOXP3 gene -2383C/T polymorphism is associated with susceptibility to systematic lupus erythematosus (SLE) in Chinese Zhuang population [20].

Studies on the association of this polymorphism with migraine are limited. To our knowledge, our research is the first study to investigate the relationship between rs5902434 in FOXP3 polymorphisms and the risk of developing migraine in Iranian population. Only in one study association between FOXP3 gene polymorphism and migraine was investigated, the results of this study showed that there was no significant difference between the allelic and genotypic distribution of FOXP3 rs3761548 polymorphism in women and men with migraine compared to the control group [35].

The promoter region located upstream of the gene initiation site plays an important role in regulating gene expression. A polymorphism in the FOXP3, as rs3761548, may modify the transcription factor binding sites and change gene expression. In our study, we found A allele and AC genotype were significantly higher in migraine patients. To date, the exact mechanism of FOXP3 regulation has not been determined, but a study by Shen et al. in 2010, indicated that A allele in patients may cause to reduction of FOXP3 expression and leading to defective transcription of FOXP3 gene [36].

In conclusion, the results of the present study showed SNP rs3761548 in FOXP3 gene was associated with the susceptibility to migraine disease. Also, we did not find a statistically significant association of rs5902434 with migraine. Further studies with larger sample sizes and different populations in other parts of the world are needed to validate the relationship between this polymorphism on migraine susceptibility.

Availability of data and materials

All data generated or analyzed during this study are included in this manuscript. In addition, more detail data are available from the corresponding author on reasonable request.

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Acknowledgements

The authors gratefully acknowledge the Research Committee of Arak University of Medical Sciences for the financial Support.

Funding

This work was supported by the Arak University of Medical Science, Arak, Iran (Grant Number: 3186).

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Authors and Affiliations

  1. Department of Neurology, School of Medicine, Arak University of Medical Sciences, Arāk, Iran

    Fardin Faraji

  2. Molecular and Medicine Research Center, Arak University of Medical Sciences, Arāk, Iran

    Ghasem Mosayebi, Maryam Bahrami & Mana Shojapour

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  2. Ghasem Mosayebi
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Contributions

FF was responsible for diagnosis and confirmation of the disease, MS participated in design, data collection, and preparing the first draft of the manuscript. MB performed the experiments. GM participated in design the study and drafting the article. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Mana Shojapour.

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Ethics approval and consent to participate

The present study was approved by the Ethics Committee of Arak University of Medical Science, Arak, Iran (IR.ARAKMU.REC.1397.237). Informed consent was obtained from all participants. All methods were performed in accordance with the relevant guidelines and regulations.

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The authors declare no competing interests.

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Faraji, F., Mosayebi, G., Bahrami, M. et al. rs3761548 (C/A) and rs5902434 (del/ATT) polymorphisms of Foxp3 gene in Iranian patients with migraine. Egypt J Med Hum Genet 24, 18 (2023). https://doi.org/10.1186/s43042-023-00400-6

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