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Genetic association and gene expression studies suggest that genetic variants in the SYNE1 and TNF genes are related to menstrual migraine



Menstrual migraine (MM) encompasses pure menstrual migraine (PMM) and menstrually-related migraine (MRM). This study was aimed at investigating genetic variants that are potentially related to MM, specifically undertaking genotyping and mRNA expression analysis of the ESR1, PGR, SYNE1 and TNF genes in MM cases and non-migraine controls.


A total of 37 variants distributed across 14 genes were genotyped in 437 DNA samples (282 cases and 155 controls). In addition levels of gene expression were determined in 74 cDNA samples (41 cases and 33 controls). Association and correlation analysis were performed using Plink and RStudio.


SNPs rs3093664 and rs9371601 in TNF and SYNE1 genes respectively, were significantly associated with migraine in the MM population (p = 0.008; p = 0.009 respectively). Analysis of qPCR results found no significant difference in levels of gene expression between cases and controls. However, we found a significant correlation between the expression of ESR1 and SYNE1, ESR1 and PGR and TNF and SYNE1 in samples taken during the follicular phase of the menstrual cycle.


Our results show that SNPs rs9371601 and rs3093664 in the SYNE1 and TNF genes respectively, are associated with MM. The present study also provides strong evidence to support the correlation of ESR1, PGR, SYNE1 and TNF gene expression in MM.


Menstrual migraine (MM) encompasses pure menstrual migraine (PMM) and menstrually-related migraine (MRM), which have been recognized as subtypes of migraine without aura (MO) in the International Classification of Headache Disorders (ICHD-III) [1]. The diagnostic criteria are placed in the appendix section of the classification because of uncertainty over whether they should be considered as separate entities. Pure MM is diagnosed when the patient fulfills criteria for MO and has confirmed that attacks occur on day 1 ± 2 of menstruation in at least two out of three menstrual cycles; MRM has the same characteristics as pure MM but attacks occur additionally at other times of the cycle.

Hormonal fluctuations throughout a woman’s life may contribute to the pathophysiology of MM. The main neuroendocrinologic events across the menstrual cycles during the reproductive years involves hypothalamic, pituitary, and ovarian axes. Gonadotropin releasing hormone (GnRH) is synthesized in the hypothalamus and then released into the portal circulation. GnRH binds to receptors in the anterior pituitary gland and activates release of follicle stimulating hormone (FSH) and luteinising hormone (LH). Release of FSH and LH lead to development of follicles within the ovary which produce estrogen during the early to mid-follicular phases (FP) of the menstrual cycle. Serum estrogen levels rise during the late follicular phase to release LH that, in turn, will initiate ovulation within 48 to 72 hours. After ovulation, the remnants of the dominant follicle become the corpus luteum, which then produce moderate to high amounts of both estradiol and progesterone during the luteal phase (LP) of the menstrual cycle. If fertilization and implantation of the ovum do not occur, then the corpus luteum regresses leading to decreasing serum levels of estrogen and progesterone during the late luteal phase causing menstrual bleeding [2]. This drop in estrogen is thought to be an important trigger in MM, first postulated by Somerville in 1972 as the ‘estrogen withdrawal’ theory [3].

The fall in estrogen is believed to be involved in increasing the susceptibility of prime blood vessels to other factors that influence migraineogenic effects through a process that remains unknown [4]. One of these factors may be prostaglandins (PGs), which have been implicated in neurogenic inflammation [5]. PGs may play a role in MM, given that there is a threefold increase in prostaglandin levels by the luteal phase, with a further increase during menstruation [6].

Different genetic variants have been identified as causing migraine. Three genes, CACNA1A, ATP1A2 and SCNA1A, have come from studies performed in individuals with familial hemiplegic migraine (FHM) a monogenic form of migraine with aura [79]; NGF, PGCP, PRDM16, TRPM8, and LRP1 are genes recently associated in Genome Wide Association Scan studies (GWAS) in common migraine populations [10]. In addition, ESR1, ESR2, PGR, AR, FSHR, NRIP1, CYP19A1 and MTHFR are genes with variants that have been associated with migraine without aura and these represent special concern for MM researchers due to their role in hormonal processes [11, 12]. However, results from these studies have been contradictory and they need to be replicated in different populations. In particular, it is unclear as to the effect of these genes in different migraine subtypes, including MM.

Thus we investigated genetic variants in 14 genes; Follicular stimulating Hormone Receptor (FSHR), A CGPR receptor (RAMP1), lymphotoxin alpha (LTA), Tumor Necrosis Factor (TNF), Synaptic Nuclei expressed (SYNE1), Potassium Channel Subfamily K Member 18 (KCNK18), Estrogen Receptor type 2 (ESR2), Cytochrome P450 Family 19, Subfamily A, Polypeptide 1 (CYP19A1), Estrogen Receptor 1 (ESR1), Progesterone Receptor (PGR), Nuclear Receptor Interacting Protein 1 (NRIP1) along with microRNA 890 (MIR890), microRNA 891A(MIRF981A) and microRNA 892A (MIR892A) in a population of MM cases and controls. These genes come from neuronal, hormonal and immunologic pathways previously associated with migraine. Genotyping analysis was followed by qPCR for determination of mRNA levels from genes significantly associated with MM in this study.



The population for this research consisted of 437 females recruited by the City of London Migraine Clinic, including both PMM and MRM cases and controls. Migraine diagnosis was in accordance with ICHD-II. The inclusion criteria for cases selection was the occurrence of attacks on day 1 ± 2 of menstruation in at least two out of three menstrual cycles. Diagnosis of PMM (menstrual attacks only) and MRM (additional attacks at other times of the cycle) was confirmed by diary evidence from at least three menstrual cycles. Controls were women with no personal or family history of migraine, age and ethnicity matched to cases, where possible. Biological specimens were collected and transported to the Genomics Research Centre for further processing. Saliva samples were obtained from the 437 females (282 cases: 68 PMM and 214 MRM; and 155 controls (median age 45.0; range 21–60 vs. 39.5; 22–61 years). Saliva samples were collected and DNA isolated using Oragene (Australia) Saliva DNA extraction kits. 74 patients (41 cases and 33 controls (median age 42.0; range 21–49 vs. 35.5; 24–49 years) with paired follicular and luteal phase samples available for 30 cases and 29 controls from the same population, who had not taken any hormonal treatment (including dietary isoflavone supplements) within the previous three months, were asked to donate blood samples at both luteal and follicular menstrual cycle stages. A total number of 134 samples were collected in Paxgene tubes for expression analysis purposes. mRNA extraction was carried out using Qiagen PAXgene blood miRNA kits (Catalog # 763134). Phenotypic data was obtained via a medical questionnaire that surveyed migraine family history, symptoms, triggers, medication use and contraceptive use. The study protocol was originally approved by the Griffith University Human Research Ethics Committee and subsequently by the Queensland University of Technology Human Ethics Committee (Australia), and the East London and the City Research Ethics Committee (UK). All subjects provided signed, informed consent prior to participation.

Genotype analysis

For this part of the study three different techniques were used. Genotyping of the G594A variant in the ESR1 gene was carried out by using PCR-RFLP. The restriction enzyme Btg I (New England Biolabs, Australia) was used for the determination of the SNP genotype. Variant C325G (rs1801132) was genotyped using TaqMan® SNP Genotyping Assay (life technologies, Cat. #4351379) and following the manufacturer instructions.

PROGINS insertion/deletion was tested with a standard PCR. Samples were then observed on a 2% agarose gel to detect the presence of the PROGINS insert (details in Additional file 1).

A total of 34 SNPs were selected from 14 different genes on nine chromosomes as the research panel for the study. Selected SNPs were located in genes involved in neuronal, hormonal and immunologic pathways previously associated with migraine. The SNPs were tested by using the Sequenom genotyping platform (Sequenom®, San Diego, CA, USA), which uses MALDI-TOF mass spectroscopy and MassARRAY technology with an iPlex system. Primers for polymerase chain reaction (PCR) amplification and single base extension were designed by Sequenom Assay Design 3.1 software (Sequenom, San Diego, CA, USA) according to the manufacturer’s instructions (Additional file 2).

Gene expression analysis

Two-step quantitative reverse transcription PCR (qPCR) was performed using a standardized protocol in our laboratory. An amount of 100 ng of RNA was converted into cDNA by adding 9.2 ng/uL Invitrogen Random Hexamers, dNTPs (500 uM), and free-RNAse H2O to a final volume of 32.5ul. The reaction was incubated at 65°C for 10 minutes in a thermocycler to disrupt secondary structures, followed by a second incubation on ice for at least 5 minutes. In the second step of the reaction, 1st Strand Buffer (1X), DTT (2 mM), SuperScript® III Reverse transcriptase (100U) and RNase- free H2O were added to the previous reaction product for a final volume of 50 ul. The cDNA synthesis reaction was carried out with an initial incubation of 25°C for 5 minutes, followed by a 50°C for 60 minutes and a final step of reaction inactivation at 70°C for 15 min. Stock cDNA was stored at −80°C and 1:2 diluted cDNA working samples were stored at −20°C.

To scan levels of expression of PGR, ESR1, SYNE1 and TNF genes we used SYBR Green PCR Master Mix 1X (Life Technologies, Australia), 200 nM reverse and forward primers (Additional file 2), Rox (reference probe) 2X, 100 ng of cDNA and free RNase- H2O to a final volume of 10 ul. Fifty cycles of 50°C-2 min, 95°C-3 min, 95°C–3 s, and 60°C–30 s were carried out in a 7900HT Fast Real-Time PCR System (Applied Biosystems, Australia). In order to allow for relative quantitation of gene expression, we used the reference genes 18S and GADPH. Efficiency tests for all primers sets to be used (Additional file 3) were performed and amplification efficiencies were found to be comparable.


As part of the quality control process, we first performed a Hardy Weinberg test followed by a standard case–control association test using Chi-square analysis with Plink V1.07 [13]. In order to minimize the effect of having a dissimilar number of cases and controls in our study, we implemented a logistic regression analysis in RStudio (version 0.97.312) [14] for those SNPs with p-values < 0.01 in the previous Chi-square test. A Wald test was applied to fit the logistic regression model.

For expression analysis the ΔΔCt method was used. The ΔΔCt calculations were executed using Microsoft Excel software. The statistical significance of differentially expressed genes between cases and controls was determined by a standard t-test. Logistic regression was also performed using genotype and gene expression levels as predicting variables for migraine. The Pearson’s correlation was used to test correlations between expression levels of PGR, ESR1, TNF and SYNE1. The statistical significance was assessed by comparing the observed p values to an alpha threshold of 0.01. All these analyses were performed by using RStudio.


Genotyping study

The initial quality control process allowed us to identify and subsequently to delete 6 SNPs for violating the Hardy/Weinberg equilibrium (rs1805087, rs1584243, rs1800683, rs1800629, rs1519480 and rs7127507), 2 SNPs (rs1800630, rs363314) for having a low genotyping calling rate (<80%), 1 SNP with 3 alleles (rs12273363) and 3 SNPs for showing a unique allele (rs146806052, rs113352055 and 5965992). Table 1 shows Chi-square and p-values for the studied SNPs that passed all the quality control checks. The analysis was completed for all cases grouped together (PMM and MRM), and individually for each subgroup. SNPs rs3093664 (TNF) and rs9371601 (SYNE1) were both significantly associated with migraine in the combined PMM-MRM sample and the MRM sample. Association after exclusion of PMM individuals from the analysis lead to a increased of the level of significance, suggesting a stronger effect of TNF and SYNE1 variants in MRM patients. Significance was detected in two SNPs (rs2229741 and rs4986938), located in NRIP1 and ESR2 in PMM individuals. Table 2 shows allelic and genotypic frequencies and counts for associated SNPs.

Table 1 Association analysis
Table 2 Alleles and genotypes frequencies for each of the associated SNPs according to the sub-population MRM, MM or the total population

Table 3 presents logistic regression analysis results. Both allelic and genotypic odds ratios are shown Genotype GA in SNP rs3093664 showed a protective effect on migraine risk in the total population (OR = 0.46, 95% CI = 0.24-0.86) and in the MRM sub- population (OR = 0.46, 95% CI 0.24-0.89). This effect is likely based on the presence of the G allele, which showed a significant p-value of 0.009 for the odds ratio test in the total population (OR = 0.48, 95% CI = 0.28-0.84) and 0.007 in the MRM sub-population (OR = 0.45, 95% CI = 0.25-0.81), which suggests an important protective effect of this variant on the MRM phenotype. While the model for the GG genotype was not significant and the 95% CI straddled 1, this was likely caused by the extreme rarity of the GG genotype in both case and control populations.

Table 3 Odds ratio calculation for all associated SNPs

Additionally, allele T in SNP rs9371601 showed a significant OR in MRM (OR = 0.60, 95% CI = 0.43-0.84) and not the PMM sub-population (OR = 0.93, 95% CI = 0.60-1.43) (see Table 2), indicating that the effects of this SNP may be largely confined to the MRM sub-population. Interestingly, the genotypic odds ratio indicated that this protective effect was limited to TT genotypes and that heterozygotes did not show confident protection compared to GG homozygotes (OR = 0.83, 95% CI = 0.50-1.36). Allele G in SNP rs4986938 (OR = 1.90, 95% CI = 1.05-3.47) and allele A in SNP rs2229741 (OR = 1.61, 95% CI = 1.01-2.56) seemed to be a risk factor for migraine in the PMM sub-population. However, the effect is probably not strong due to the small size of the population.

Expression study

Our analysis of gene expression in our migraine populations indicated no significant difference in levels of expression in the studied genes between cases and controls and across the sub-populations (Table 4). However, we have detected significant positive correlations in the follicular phase between the expression of TNF and SYNE1 (Rho = 0.371, p = 0.005), ESR1 and PGR (Rho = 0.435, p = 0.006) and ESR1 and SYNE1 (Rho = 0.412, p = 0.002), which would indicate some interaction between them. In contrast, in luteal phase, we found a correlation between SYNE1 and PGR (Rho = 0.444, p = 0.006) and TNF and SYNE1 (Rho = 0.345, p = 0. 015). More interestingly, we found differences in the correlations between gene expression in cases and controls. For ESR1 and SYNE1, these differences were small, with both cases and controls maintaining similar levels of correlation (cases: Rho = 0.48 p < 0,001; controls: Rho = 0.4 p = 0.001). For other gene correlations however, cases maintained significant relationships while the controls had weakened or non-significant relationships. For TNF and SYNE1, the relationship was weaker, but still significant in controls (cases: Rho = 0.449 p < 0,001; controls: Rho = 0.27 p = 0.03). For ESR1 and PGR controls ceased to maintain correlation of expression (cases: Rho = 0.511 p < 0,001; controls: Rho = 0.091 p = 0.56) and a similar loss of correlation occurred between PGR and SYNE1 (cases: Rho = 0.393 p = 0.005; controls: Rho = 0.243 p = 0.12) (Table 5).

Table 4 T-student analysis for means difference in levels of gene expression
Table 5 P-values after correlating the genes in the middle of the graphic

The results of our expression analysis suggest that although there are not significant changes in gene expression of genes that may influence migraine in PMM and MRM cases compared to controls, these genes interact in a different fashion both in the luteal and follicular stages of the menstrual cycle and in cases compared to controls.


There have been very few studies carried out so far at the genomic level on MM, in part because of the uncertainty concerning its status as an entity independent from common migraine. In this research, we have identified significant differences between MM cases and controls, which both show increased risk of migraine development for the G alleles in the tested SNPs in the TNF and SYNE1 genes. TNF is a pro- inflammatory cytokine and is thus involved in a number of biological pathways, including apoptosis, chemotaxis and cell proliferation. The gene has been associated with neuronal damage and pain in response to particular cellular states, such as hypothermia and hypoxia, and thus has a significant linkage to metabolic pathways that may influence menstrual migraine development and migraine initiation [15]. This is particularly so in view of the influence of estrogen and progesterone on inflammatory processes [16, 17], and this association may represent a link to a direct mechanism by which MM is triggered. In addition, TNF has been implicated in depression and irritable bowel disease [18, 19], recognized as migraine comorbidities [20, 21]. The rs3093664 SNP itself is an intronic polymorphism located between exons 3 and 4 of TNF away from intron splicing sites, so it is unlikely that the SNPitf has a directeffectt on TNF function that would explain the association we have observed. It is thus likely that this result is caused by linkage to a nearby rare SNP that does have functional effects. Interestingly, there is a candidate for this only 52 base pairs upstream of rs3093664, in the form of rs1800620, which is located in exon 3 of TNF and causes an alanine to threonine transition in amino acid 94 of the protein. Despite being annotated as a SNP, however, Hapmap populations show no variation in rs1800620 in tested African, Caucasian, Hispanic or Pacific Rim populations and nor do any publications mention it, so its status, and any linkage to rs3093664 remains uncertain.

SYNE1 is a spectrin repeat containing protein usually found on the nuclear membrane and is involved in several kinds of protein-protein interactions where it serves as a scaffold and chaperone for various binding partners. The gene has been associated with several neural diseases, including depression and cerebellar/spinocerebellar ataxias, which have overlap with the familial forms of migraine driven by mutations, and may have direct effects in menstrual migraine development through these functions [22]. Interestingly, SYNE1 is also directly adjacent to the estrogen receptor, and polymorphisms within SYNE1 have been linked strongly to estrogen mediated events, such as ovarian cancer [23]. It is thus possible that the association seen with MM here may represent linkage to estrogen related effects, either through cross-regulation effects of the two genes or via linkage to another marker in the distal parts of ESR1 that does not show linkage to those markers we have already interrogated in this study. This hypothesis is further supported by the fact that rs9371601 is also an intronic polymorphism, lying between exons 13 and 14 of the gene. Like our tested TNF polymorphism, rs9371601 also has potential SNPs it may be linked to which cause amino acid changes with undetermined frequencies, though these are more distant, the closest two being at least 2 kb away up and downstream of it (rs267600867 and rs139324183).

Significant associations were also detected in two SNPs (rs2229741 and rs4986938) in MM individuals, although their significance was not less than 0.01 and due to our relatively small sample sub population for MM samples, we may have impaired capability to detect true associations for this population. We do however; believe it is worthy to further study these SNPs in larger populations, as the genes containing these variants (NRIP1 and ESR2 respectively) are important hormonal receptors and modulators of hormonal action that might represent interesting targets in the etiology of menstrual migraine. Like our other 2 SNPs, rs2229741 and rs4986938 are not amino acid changing variants, being intronic and part of the 3′ UTR of their genes respectively, and it is possible that the weakness of the associations we have identified also indicate linkage to functional polymorphisms nearby.

The ESR1 and PGR markers tested in MM showed no significant association in the present study, despite previous association with migraine without aura [2426]. It is possible that while the functional changes brought about by the tested markers affect hormonal signalling, they do not result in the kind of metabolic changes triggering menstrually related migraine. This is further supported by the different associations we obtained in the PMM and MRM sub-populations. The SNPs in NRIP1 and ESR2 are far from significant in the MRM sub populations and while the SYNE1 SNP is highly non- significant in the MM sub-population, the TNF SNP shows near significance in the PMM cases (p = 0.07), indicating a potential, if weaker, effect for this gene in that sub- population. Our results may thus indicate that migraine without aura and MRM may have different causative genes, despite sharing alterations to the hormone receptor pathways as part of their etiology [27].

Statistical analysis showed that there was no significant difference in ESR1, PGR, SYNE1 or TNF expression for cases or controls in any menstrual phase. We have, however, shown an interesting correlation of expression of the four proteins. Our analysis showed that expression of ESR1 correlates significantly with PGR and SYNE1, and also SYNE1 and NF are significantly correlated in the follicular phase of the menstrual cycle. However, this correlation breaks down in the luteal phase where ESR1 correlates with TNF and SYNE1 correlates with PGR. This may represent normal expression control responses for each of the particular genes in response to the altering hormonal situation in the different phases. On the other hand, after comparing expression correlation in cases and controls separately, a change in the complex network of protein interaction between ESR1, TNF, PGR and SYNE1 seems to be occurring. Highly significant p-values and stronger correlation for TNF/SYNE1, ESR1/PGR and PGR/SYNE1 in cases suggest an important role of pathways involving these genes in MM. Maintaining this correlation indicates that individuals suffering from MRM may have increased sensitivity to variations in hormonal signaling effects compared to controls. This is the first time these correlations and their relationship to migraine status has been identified.

Since SYNE1 polymorphisms have been previously associated with estrogen related events, an expression link between the pro-inflammatory cytokine TNF with SYNE1 in cases might explain why polymorphisms in both genes are associated with MM in our population. This adds some weight to the potential for this pathway to be playing a role in MM and may represent the differential effects of the polymorphisms examined or more likely linked SNPs nearby, on pathway signal transduction. Identifying the specific interactions between ESR1, PGR, TNF and SYNE1 proteins and how polymorphisms factor into them would help to elucidate important mechanisms involved in MM that may be a useful avenue for development of a treatment for the disorder. Further work should also examine additional time points within the follicular and luteal phases to determine if a specific point of departure between case and control gene regulation can be identified.


Our results show that SNPs rs9371601 and rs3093664 in the SYNE1 and TNF genes, respectively are associated with MRM in our population. Significant associations were also detected in SNPs rs2229741 and rs4986938 in PMM individuals, but due to the small number of PMM samples used to implement the analysis, we should be cautious about interpretation and consider both polymorphisms for future analysis in bigger populations. Statistical analysis showed that there was no significant difference between ESR1, PGR, SYNE1 or TNF expression in cases or controls in any of the menstrual phases. We have, however, shown a correlation of the four expressed genes in patients with PMM or MRM. Further studies should be focused on the validation of these results in larger populations with more collection timepoints for blood samples and on the understanding of protein interaction in different stages of the menstrual cycle and its effect on migraine etiology. Although we did not find any association of ESR1 and PGR variants with migraine, we believe that future studies should continue exploring the large family of co-activators and co-repressors that modulate the effects of ESR1 and PGR. It may be that variants in these genes result in the development of MRM. Our results also indicate that migraine without aura and MRM may have different causative genes, despite both potentially sharing alterations in hormone receptor pathways [27].



Familial hemiplegic migraine


Migraine without aura


Menstrually- related migraine


Pure menstrual migraine


Menstrual migraine.


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The research for this paper was financially supported in part by an Australian Govt International Science Linkages grant, a research grant from the Investigator-Initiated Studies Program of Merck & Co., a research grant from the Migraine Trust and by infrastructure purchased with Australian Government EIF Super Science Funds as part of the Therapeutic Innovation Australia - Queensland Node project. The opinions expressed in this paper are those of the authors and do not necessarily represent those of the Australian Government, Merck & Co., Inc. or the Migraine Trust. Thanks also to Carlos Aya Bonilla and Rachel Okolicsanyi for technical advice.


The Enrico Greppi Selection Committee 2014 is:

Giorgio G. Bono, Hans G. Kress, Paolo Martelletti, Dimos-Dimotrios D. Mitsikostas, Lars J. Stovner and Luis Villanueva.

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Correspondence to Lyn R Griffiths.

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Competing interests

The City of London Migraine Clinic received funding from Merck for clinical trials with telcagepant in migraine.

Authors’ contributions

AF and AM G were responsible for sample collection. AF, AM and LG conceived and supervised the project and edited the manuscript. RS, AR, LG drafted the manuscript. AR, RS, RL performed the statistical analyses. AR, BR and HS carried out the molecular genetic studies. All authors read and approved the final manuscript.

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Rodriguez-Acevedo, A.J., Smith, R.A., Roy, B. et al. Genetic association and gene expression studies suggest that genetic variants in the SYNE1 and TNF genes are related to menstrual migraine. J Headache Pain 15, 62 (2014).

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