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Association of HTR3B gene polymorphisms with depression and its executive dysfunction: a case–control study

BMC Psychiatry volume 23, Article number: 128 (2023) Cite this article

Abstract

Background

Previous studies have shown that depression was associated with HTR3B gene. The aim of this study was to investigate the relationship between polymorphisms of the HTR3B gene and depression and its executive dysfunction in Chinese Han population.

Methods

A total of 229 patients with depressive disorder and 202 healthy controls were enrolled. Six Single nucleotide polymorphism sites (SNPs) including rs10789970, rs4938056, rs12421126, rs1176744, rs2276305 and rs12795805 were genotyped by Snapshot. Clinical features were collected using a general demographic questionnaire. The 24-item Hamilton Depression Scale (HAMD) was used to assess the symptoms’ severity of the patients. The patients' executive function was assessed using a series of cognitive tests including Maze Test, Symbolic Coding Test, Spatial Span Inverse Order Test, Linking Test, and Emotional Management Test.

Results

The genotypic and allelic distributions of rs1176744 in HTR3B gene were significantly different (χ2 = 11.129, P = 0.004, χ2 = 9.288, P = 0.002, respectively) between patients and controls. The A allele was positively correlated with depression. The proportion of A carriers was significantly higher and that of C carriers was lower in patients than those in controls. Patients had significantly lower scores of Spatial Span Inverse Order Test in carriers of A allele at locus rs1176744 and higher scores in carriers of C alleles at locus rs1176744 and rs12795805.

Conclusions

The polymorphisms of HTR3B gene may be associated with depression in Chinese Han population. The A allele of rs1176744 may increase the risk of developing depression and executive dysfunction while C alleles of rs1176744 and rs12795805 may be the protective factors for executive dysfunction in patients with depression.

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Introduction

Major Depressive Disorder (MDD) is the leading cause of disability [1] according to the World Health Organization (WHO), which affects roughly 350 million people worldwide [2], and is the third-largest contributor to the global burden of disease [3]. Numerous studies have demonstrated that cognitive dysfunction in patients with major depression is a strong predictor of occupational and social dysfunction [4]. The Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition(DSM5) states that specific criteria for depression include cognitive function issues such as impaired attention, memory, and executive functioning [5]. Patients with MDD experience permanent and recurrent cognitive impairment leading to significantly lower quality of life, and these deficiencies may continue even after a major depressive episode has subsided [6]. These deficits include deficits in the domains of processing speed, visual selective attention, working memory, verbal learning, and executive function [7]. Studies have reported that approximately 20–30% of depressed individuals have severe executive function deficits [8], which have been shown to be the strongest independent predictor of functioning in patients with MDD in remission [9]. And a brief cognitive screen at the start of treatment, focusing on executive functioning, was considered to be of useful value in the prognosis of depression [10].

MDD is thought to be a complex polygenetic disorder in which both genetic and environmental factors are involved in its onset and development [11, 12]. The focus of current genetic research is mostly on functional genes such as genes from dopamine system and the serotonergic gene variants (i.e., HTR1A-7 and SLC6A4) [13, 14]. 5-HT receptors (HTR) are known to be involved in the etiology of depression. Currently, it is known that a total of 18 genes are responsible for 14 different mammalian 5-HT receptor subtypes, which are further subdivided into 7 families, and the 5-HT3 receptor, which is a distinct ion channel [15], is expressed in both the central nervous system (CNS) and the peripheral nervous system (PNS) and has the ability to control rapid depolarization of either peripheral or central neurons [16]. Presynaptic 5-HT3 receptor activation is followed by rapid depolarization, which causes a rapid rise in cytosolic Ca2+ concentration. Postsynaptic activation results in depolarization by Na+ and K+ influx, which regulates CNS and PNS function [17]. A previous study showed that the antagonist of the 5-HT3 receptor could reverse depressive-like behavior [18]. Ondansetron, a serotonin 5-HT3 receptor antagonist, has been shown to boost the expression of antioxidant components like glutathione, increase the levels of 5-HT, and reduce depression in diabetic rats by inhibiting the 5-HT3 receptor [19].

Five subunits of the 5-HT3 receptor make up the ligand-gated ion channel which are encoded by the serotonin receptor genes HTR3A, HTR3B, HTR3C, HTR3D, and HTR3E, respectively [20]. 5-HT3B [21] is one of the most well investigated and well-characterized subunits which may have a role in tissue-specific functional alterations in 5-HT3-mediated signaling and/or regulation [20]. A clinical study found that the polymorphism of rs1176744 in HTR3B gene was related to major depression in women [22]. Another study in 2019 discovered a link between rs1176744 polymorphism and major depression in the Russian population [23]. Meanwhile, HTR3B rs1176744 polymorphism and rs3831455 deletion have been linked to bipolar disorder in various studies [22, 24, 25]. The 5-HTR3 antagonist Ondansetron has been shown to be able to counteract scopolamine-induced learning deficits [26] and improve maze performance [27]. Itasetron, another 5-HTR3 antagonist, has been found to have memory-enhancing effects [28]. So far, there is no study exploring the relationship between the polymorphisms of HTR3B gene and cognitive dysfunction in patients with depression.

Therefore, we conducted a case–control study to investigate the association between HTR3B gene polymorphisms and depression and its executive function in Chinese Han patients with major depressive disorder.

Methods

Participants

In this study, patients who visited outpatient clinics or were admitted to hospital in Shandong Mental Health Center from January 2012 to March 2014 were enrolled. The inclusion criteria included: patients met the Diagnostic and Statistical Manual of Mental Disorders—Fourth Edition (DSM-IV) diagnosis of major depressive disorder; male or female; aged between 30 and 60 years old; biological parents were Chinese Han population; 24-item Hamilton Depression Scale (HAMD) score ≥ 20. Depressive episodes caused by organic brain disorders, psychoactive substance use, severe physical illnesses, and other psychiatric disorders were all excluded. Other exclusion criteria included women who were pregnant or nursing, those with a history of mild mania, manic or mixed episodes, or those with psychotic symptoms. Healthy adults who were aged between 30 and 60 years old were included in the study as the control group. They also met the following criteria: biological parents were Chinese Han population; had no neurological illness or personality disorder which match the DSM-IV axis I and axis II diagnoses; had no family history of mental illness. Each participant gave their informed consent in writing and took part in the study voluntarily. Ethical approval was granted by the ethics committee of Shandong Mental Health Center.

Assessments

General sociodemographic data and personal history of all the participants were collected using a self-made questionnaire which included age, gender and years of education. The 24-item Hamilton Depression Scale (HAMD) was used to evaluate the symptoms’ severity of the patients.

The patients' executive function was assessed using the MATRICS Consensus Cognitive Battery (MCCB), a computerized testing package, which has been validated in China and has a good internal consistency and acceptable reliability for patients with mood disorder [29]. The specific tests used are as follows.

  • Maze Test (MT): The purpose of the test is to assess reasoning and problem-solving skills, including anticipation, planning, and impulse control. The test is administered by drawing a pathway from the entrance to the exit of the maze. The lines should be drawn in accordance with the requirements and should not intersect with the original lines in the maze, nor should the lines be drawn at the corners. If the subject does not get out of the maze within the time limit, a score of 0 will be given. If the subject comes out of the maze within the specified time, the score will be given according to the time he/she actually completed the maze. All the scores of the maze will be added up to the raw score.

  • Symbolic Coding Test (SCT): Using the standard template provided as a reference, the participant selects the numbers that match the different symbols and fills in the blanks, requiring the participant to complete them within 90 s. The number of errors is subtracted from the total number of answers to give the final score.

  • Spatial Span Inverse Order Test (SSIOT): The main test is spatial location memory breadth. Ten blue squares are displayed on the screen and the participant is asked to click on them repeatedly in the opposite order. A score of 1 is given to those who click in exactly the right order. Those who click on more or fewer squares or in the wrong order will receive 0 points.

  • Linking Test (LT): The test is designed to assess visual scanning and motion trajectories that reflect the participant's speed of information processing. The participant is asked to connect the numbers on the answer key in order from smallest to largest without interruptions during the test. The participant's completion time is used as the scoring criterion. If the participant exceeds the time limit, the test time is recorded as 300 s and those who do not finish within the time limit are scored as errors.

  • Emotional Management Test (EMT): This test is designed to assess the ability to use emotions to accomplish tasks and solve emotional problems, and the ability to integrate their emotions into problem-solving. The total score is used as the raw score.

SNPs selection

SNPs located at the 3' end, 5' end, or exon region were selected based on the confirmed HTR3B gene sequence information from the National Center for Biotechnology Information (NCBI) database. We selected SNPs which had a minimum allele frequency (MAF) greater than 10% in the Chinese Han population. Six loci of HTR3B gene (rs10789970, rs4938056, rs12421126, rs1176744, rs2276305 and rs12795805) were chosen, the MAF of which were 42.5%, 43.7%, 21.7%, 18.6%, 23.2% and 15.9%, respectively.

DNA extraction and SNPs genotyping

First, 5 ml of venous blood of all participants were drawn and stored in an anticoagulant tube (with EDTA anticoagulant). The collected samples were then centrifuged at the speed of 3000 RPM for 10 min. After centrifugation, leukocytes were extracted and placed in EP tubes in -70℃ refrigerator for use.

The whole genome DNA was extracted from peripheral blood leukocytes using the DNA extraction kit from Hangzhou Jiuna Biotechnology Co., Ltd. A total of 1500 μl of red blood cell lysate was added into the above blood samples after thawing and centrifuged at 12,000 rpm for 20 s. After that, 500 μl of cell nucleus lysate and 200 μl of protein precipitate was added and centrifuged at 13,000 rpm for 5 min, then 650 μl of propanol was added to obtain a filamentous or cotton wool-like white DNA precipitate. Then, added 1 ml 70% ethanol to the DNA precipitate and centrifuged at 12,000 rpm for 1 min, and added 0.5 ml 170% ethanol to centrifuge at 12,000 μl for 1 min. Finally, the precipitate was wiped dry and 50 μl sterile water was added to dissolve the DNA precipitate, and the extracted DNA was then put into the -70 ℃ refrigerator again for use.

The primers were designed using the online primer design tool and synthesized by Beijing Genomics institution (BGI) (Table 1). The PCR was carried out in a 5-μl volume containing 1 μl genomic DNA, 0.5 μl of 10 × PCR buffer, 1 μl of Primer, 0.1 μl of dNTPs (2.5 mM each), 1.8 μl of HPLC and 0.2 μl of Ex Taq [5U/μl], 0.4 μl of 25 mM MgCI2. The reaction conditions of PCR were as follows: after an initial step of 15 min at 94 °C, denaturation at 94 °C for 20 s, annealing at 56 °C for 30 s, extended at 72 °C for 60 s; 45 cycles in total. Then the amplified products were digested and purified. The SAP (Shrimp Alkaline Phosphatase) reaction was carried out in a volume containing 1.53 μl of deionized water, 0.17 μl of SAP buffer and 0.3 μl of SAP enzyme 2μL. The reaction conditions for SAP were as follows: after an initial step of 40 min at 37 °C, the SAP reaction was completed at a temperature of 4 °C after a continuous period of 5 min at a temperature of 85 °C. Then, the Snapshot extension reactions were performed with the Snapshot Multiplex PCR Kit, and the 9 μl volume containing 7 μl of PCR product, 0.041 μl iplex enzyme, 0.94 μl of iplex extension primer, 0.2 μl of iplex stop primer, 0.2 μl of iplex buffer and 0.619 μl of deionized water. After an initial step of 30 s at 94 °C, denaturation at 94 °C for 5 s, annealing at 52 °C for 5 s, extended at 80 °C for 5 s and then followed by 40 cycles. Finally, data analyses and genotyping were performed using Mass ARRAY software after desalination.

Table 1 Primer sequences
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Statistical analysis

Statistical description and analyses were carried out using SPSS 21.0 software.

The goodness of fit Chi-square test was used to compare the allelic genotypes of six SNPs and test whether they conformed to Hardy Weinberg equilibrium (HWE). Chi-square test and Independent-samples t-test were used to compare the differences of demographic data between patients and healthy controls, where independent samples t-tests were also used to compare the cognitive function test scores of carriers of different alleles at different genetic loci. One way ANOVA and Pearson correlation were used to analyze the relationship between general information and cognitive function. Covariance analysis was used to analyze the association between different genotypes of gene polymorphisms and cognitive dysfunction. The difference was statistically significant when Ρ < 0.05. Bonferroni correction was used to calculate the threshold P value for significance tests. Chain imbalance and haplotype analyses were carried out using the Haploview software (version 4.2).

Results

General demographic characteristics of the participants

A total of 229 patients with depressive disorder were enrolled in this study, in which 106 patients were male and 123 were female. The control group consisted of 202 participants, including 90 males and 112 females. There was no statistical difference between the two groups in terms of age, sex, or years of education (P > 0.05) (Table 2).

Table 2 Comparison of general demographic information between patients and controls
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Association of the HTR3B gene polymorphisms with depressive disorder

Hardy–Weinberg Law of Equilibrium

The HTR3B gene's six polymorphic loci were tested using the Hardy–Weinberg law of Equilibrium in both the case and control groups. The genotype distribution of five loci (rs10789970, rs4938056, rs12421126, rs1176744 and rs12795805) except for rs2276305 (P < 0.05) were consistent with the Hardy–Weinberg Equilibrium. The genetic data of rs2276305 was excluded from our following study.

Genotypic distributions of HTR3B gene in patients and controls

The genotypic distribution of rs1176744 in HTR3B gene was statistically different (χ2 = 11.129, P = 0.004) between patients and controls. The difference remained significant after Bonferroni correction (P < 0.01correcting for 5 tests). The frequencies of CC and AC genotypes were lower while that of AA genotype was higher in patients (2.2%, 35.7%, 62.1%, respectively) than those in controls (8%, 42.0%, 50.0%, respectively). Meanwhile, the differences of A carriers with non-carriers and C carriers with non-carriers between the two groups were significant as well (P < 0.05). In addition, the distributions of C carriers and non-carriers of rs12795805 was found to be different between patients and controls (P < 0.05) in which the proportion of C carriers were significantly higher in patients, but this difference was no longer significant after Bonferroni correction. There was no significant difference among genotype frequencies and distributions of allele carriers vs non-carriers in rs10789970, rs4938056 and rs12421126 between the two groups. The comparison of the genotype frequencies and distribution of allele carriers vs non-carriers are shown in Tables 3 and 4.

Table 3 Comparison of genotype frequencies of HTR3B gene polymorphism loci between case and control groups
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Table 4 Comparison on frequencies of allele carriers and non-carriers between groups
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Allelic distributions of HTR3B gene in patients and controls

There were statistical differences in the allelic distributions of rs1176744 and rs12795805 in HTR3B gene (χ2 = 9.288, Ρ = 0.002; χ2 = 4.256, Ρ = 0.039, respectively) between the two groups, and the proportions of A allele of rs1176744 and C allele of rs12795805 were significantly higher in patients. These differences were positively correlated with depressive disorder (OR = 1.126, 95% CI: 1.042 to 1.217; OR = 1.387, 95% CI: 1.014 to 1.897, respectively). However, P value of rs12795805 did not withstand Bonferroni correction for multiple testing. No association was found between depression and the other three SNPs tested. The comparison of allelic distributions of five polymorphic loci in HTR3B gene is presented in Table 5.

Table 5 Comparison of allele frequencies of five SNPs in HTR3B gene between the two groups
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Linkage disequilibrium and haplotype analysis

Linkage disequilibrium (LD) was determined between the five SNPs of HTR3B gene in both patients and controls. LD blocks of HTR3B gene SNPs and values of the correlation coefficient \({R}^{2}\) for both groups are presented in Fig. 1. Significant P values are shown in red on the haplotype block model created by the Haploview tool. One haplotype block was noteworthy, according to haplotype analysis employing the HTR3B gene loci that were under investigation. Between the three loci of this haplotype block, rs4938056, rs10789970, and rs12421126 were in linkage disequilibrium (Fig. 1).

Fig. 1
figure 1

Linkage disequilibrium analysis of the selected SNPs. (Note: The numbers in the LD block are the values of R2 which are shown in the percentage chart. For example, 34 represents R2 = 0.34)

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Relationship between HTR3B gene and cognitive deficits in patients

Comparison of cognitive functions between patients and controls

In this study, we first investigated the difference of cognitive functions examined between patients and controls. A total of five tests including Maze Test, Symbolic Coding Test, Spatial Span Inverse Order Test, Linking Test and Emotion Management Test were used to assess the executive functioning of all the participants. Significant differences were obtained in the scores of LT, SSIOT and EMT (P < 0.05), which indicated worse executive functions of depressed patients (Table 6). There was no difference in the scores of SCT and MT between groups (P > 0.05).

Table 6 Comparison of cognitive functions between case and control groups
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Potential confounders of cognitive deficits in patients

The potential confounders (age, education, gender, and total HAMD scores) of the impaired executive functions in patients were then investigated. The results showed that the scores of SSIOT were significantly associated with age (Table 7).

Table 7 Association between general information and cognitive deficits in patients
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Association of the polymorphism of HTR3B gene and cognitive deficits

According to the above results, covariance analysis in which age was regarded as covariate was then performed to find out whether different genotypes and allele carriers at different loci of HTR3B gene were related to cognitive deficits of depressive patients. The results revealed significant difference (P < 0.05) among three different genotypes and between different allele carriers of rs1176744 and rs12795805 in SSIOT. Patients with AA genotypes of rs1176744 had significantly lower scores, suggesting worse executive function, than those with AC and CC genotypes (P < 0.05).The A carriers had lower scores and C carriers had higher scores than non-carriers respectively, indicating A allele is a risk factor while C allele is a protective factor for executive function in patients. In addition, C carriers of rs12795805 had significant higher scores than non-carriers, demonstrating C allele is a protective factor (Table 8).

Table 8 Comparison of the correlations between genotype and allele carriers and cognitive function at different loci
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Discussion

This study had two goals. First, we investigated the relationship between the HTR3B gene polymorphisms and depressive disorder. We discovered that in the Chinese Han population, the polymorphism of rs1176744 in HTR3B gene may be associated with depressive disorder. Next, we investigated the connection between the polymorphisms of HTR3B gene and the executive dysfunction of patients. The findings demonstrated that rs1176744 and rs12795805 polymorphisms were associated with the scores of SSIOT. The A allele of rs1176744 may increase the risk of cognitive dysfunction and C alleles of rs1176744 and rs12795805 may be the protective factors in those with depressive disorder.

In this study, we found that there were more participants with AA genotype and A carriers while less C carriers of rs1176744 in patients than those in controls. The result was consistent with previous studies. Yamada et al. found that the rs1176744 locus cause missense mutations (Tyr129Ser:386A > C) and that Tyr129 homozygote (AA genotype) were more common in female depressed patients than controls [22]. In a 2019 study of 222 depressed and 147 healthy Russians [23], the rs1176744 polymorphism of HTR3B gene was also found to be significantly related with depression. A previous study showed that the heterozygote for the rs1176744 locus of AC (Y129S) could widen the maximum response to 5-HT, decrease desensitization and deactivation kinetics, and increase mean channel open duration [30]. In the same year, Karen's research revealed that the average opening time of the cation channel increased sevenfold in the Y129S receptor when compared with the AA genotype, and the increased signal displayed by the Y129S receptor may have a preventive effect on the onset of depression [31]. As a result, it could be suggested that AA genotype may be the risk factor for the etiology of depression and C allele may be a protective factor.

Our study found evidence about the association between the HTR3B gene polymorphism and the executive dysfunction of patients. Studies have reported that the mRNA of the HTR3B gene is mainly expressed in the prefrontal cortex, brainstem amygdala and mediodorsal thalamus, all of which have been shown to be associated with cognitive function [32,33,34,35,36,37]. There were few previous studies on the association of 5-HT3B gene and cognitive function. Kulkarni J, et al. found that individuals with the C allele of SNP rs1176744 had lower scores on the Pain Catastrophizing Scale (PCS), suggesting that C allele may act as a preventive measure against pain catastrophizing, a coping strategy characterized by an excess of negative thoughts and feelings [38]. It has been well studied that there were parallel pathways between pain and depression [39], and our findings suggested that among depressed patients, the A carriers had worse performance and C carriers had better performance of executive function than non-carriers respectively, indicating that A allele may increase the risk of executive dysfunction while C allele showed a protective effect.

Another novel finding of this study was the results regarding the polymorphism of rs12795805. Association analyses demonstrated moderate correlation between C allele and depression (OR = 1.387) although the significance was no longer present after Bonferroni correction. It is important to note that the small effect size for this association could indicate a link between rs12795805 and depression, but that the effect size was too small to detect a significant difference with the current sample. This smaller effect size may have occurred due to an insufficient sample size. Meanwhile, C allele was found to have a protective effect on the executive dysfunction of depression. We have not found any previous study reporting the relationship between this locus and depression. Two recent studies on bipolar disorder and heroin addiction respectively observed no significant association of rs12795805 polymorphism with these two mental health problems [40, 41].

The relationship between 5-HT3 receptors and cognitive function have been investigated in different studies [26,27,28, 42,43,44] which revealed that 5-HT3 receptor antagonist could improve cognitive functions including attention, learning and memory. A recent study reviewing key data obtained from preclinical behavioral models and clinical trials of MDD concluded that vortioxetine (a 5-HT3 receptor antagonist) improved cognitive impairment in patients with MDD [45]. In a case–control research conducted in 2021, ondansetron, a serotonin (5-HT) 3 receptor antagonist, was found to increase MCCB scores (assessments included speed of processing, attention/alertness, working memory, verbal learning, visual learning, reasoning/problem-solving, and social cognition) in patients with schizophrenia [46].

Our findings are subject to several limitations. Firstly, the sample size was modest and the genetic power of this study was relatively low. Secondly, patients who chose not to seek treatment could not be involved in our findings, as our patients were identified from the outpatient and inpatient departments of the hospital. Thirdly, only the executive function was investigated, so the cognitive deficits of patients such as attention, learning and memory may not be fully explored. Lastly, a potential confound to findings of executive function is that depressed patients were allowed to be on antidepressant medications. We could not exclude the possibility that antidepressants may play a role in the current executive function findings and, if so, in which direction. For example, whilst some studies suggested that antidepressants may lead to improvement on executive function in MDD patients [47,48,49], this effect was not consistently observed, with a recent study concluding that the use of antidepressants, particularly SSRIs and trazodone, may instead increase the risk of cognitive impairment 5 years later among the oldest old women [50]. The current study adopted a real-world, pragmatic design, as requiring patients to wean off medications would likely have worsened their clinical condition and may have placed them at risk, including risk of suicide.

The etiology of depression is still unknown, and the pathogenesis of this disease could be caused by a variety of factors including genetics, gene expression, personality basis, social environment, etc. Therefore, further genetic and epigenetic studies based on larger sample sizes and studies to explore the interaction of genes and environments are needed.

Conclusions

In our study, we found that the polymorphism of rs1176744 in HTR3B gene may be associated with depression, where individuals carrying A allele may be more likely to develop depressive disorder. The polymorphisms of rs1176744 and rs12795805 were associated with executive function, in which A allele of rs1176744 may increase the risk of cognitive dysfunction while C alleles of rs1176744 and rs12795805 may be the protective factors in patients with depression.

Availability of data and materials

Researchers interested in the study may contact corresponding author to obtain relevant data via email: qiaovincent@163.com.

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Acknowledgements

We thank all the participants for their support in this study.

Funding

This study was supported by Youth Fund Project of Public Health Department in Shandong Province(QW013) and Shandong Province Key R&D Program (Science and Technology Demonstration Project) Project (2021SFGC0504). The funding bodies played no role in the design of the study and collection, analysis, and interpretation of data or in writing the manuscript.

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Author notes

  1. Lina Wang and Miao Wang contributed equally to this work.

Authors and Affiliations

  1. Department of Psychology, Shandong Normal University, Jinan, 250358, Shandong, China

    Lina Wang

  2. Department of Psychiatry, Shandong Mental Health Center, Shandong University, Jinan, 250014, Shandong, China

    Lina Wang, Jia Jian & Dongdong Qiao

  3. School of Mental Health, Jining Medical University, Jining, 272000, Shandong, China

    Miao Wang & Chaoben Zhao

Authors
  1. Lina Wang
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  2. Miao Wang
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  3. Chaoben Zhao
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  4. Jia Jian
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  5. Dongdong Qiao
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Contributions

Dongdong Qiao and Lina Wang designed the research; Miao Wang and Jia Jian performed the experiments; Miao Wang and Chaoben Zhao conducted sample collection and analyzed the data; Dongdong Qiao, Lina Wang and Jia Jian were responsible for the clinical diagnosis; Lina Wang and Miao Wang were responsible for manuscript writing. All authors have read and approved the final manuscript.

Corresponding author

Correspondence to Dongdong Qiao.

Ethics declarations

Ethics approval and consent to participate

The study was conducted in accordance with the Declaration of Helsinki. And the study was approved by the Ethics Committee of Shandong Mental Health Center. An informed consent was signed by each participant before participating in this study. We confirmed that all methods were performed in accordance with the relevant guidelines and regulations.

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Not applicable.

Competing interests

The authors declare that they have no competing interests.

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Wang, L., Wang, M., Zhao, C. et al. Association of HTR3B gene polymorphisms with depression and its executive dysfunction: a case–control study. BMC Psychiatry 23, 128 (2023). https://doi.org/10.1186/s12888-023-04625-y

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Keywords

BMC Psychiatry

ISSN: 1471-244X

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