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Evaluation of mild cognitive impairment genetic susceptibility risks in a Chinese population

BMC Psychiatry volume 22, Article number: 93 (2022) Cite this article

Abstract

Background

Mild cognitive impairment (MCI) is a kind of non-functional cognitive decline between normal aging and dementia. With the increase of individual age, the quality of cognitive function has become a more and more important topic. The study of gene loci in patients with MCI is essential for the prevention of dementia. In this study, we evaluate the gene polymorphism in Chinese Han patients with MCI by propensity score matching (PSM) and comparing them to healthy control (HC) subjects.

Methods

Four hundred seventeen patients with mild cognitive impairment and 508 healthy people were included. The two groups were matched by applying one-to-one PSM, and the matching tolerance was set to 0.002. The matching covariates included gender,age,occupation,marital status,living mode. Then, a case-control associated analysis was conducted to analyze the genotype and allele frequencies of single nucleotide polymorphisms (SNPs) in the MCI group and the control group.

Results

Three hundred eleven cases were successfully matched in each group, and there was no statistical difference on all the matching variables, gender, age, occupation, marital status, living mode between two groups after the match (P > 0.05). The allele frequency of bridging integrator 1(BIN1) rs7561528 showed minimal association with MCI in the Han Chinese population (P = 0.01). Compared with the healthy control (HC) group, A allele frequency of MCI group patients was significantly decreased. The genotype frequency of BIN1 rs6733839 showed minimal association with MCI in the recessive model (P = 0.03). The genotype frequency of rs7561528 showed minimal association with MCI in the codominant, dominant, overdominant, and log-additive model (P < 0.05). The genotype frequencies of StAR-related lipid transfer domain 6 (STARD6) rs10164112 showed nominal association with MCI in the codominant, dominant, and log-additive model (P < 0.05). Unfortunately, the significant differences did not survive Benjamini-Hochberg false discovery rate correction (adjusted P > 0.05). The patients with SPI1 rs1057233 may be the protective factor of MCI (OR = 0.733, 95%CI 0.625–0.859, P < 0.001), and patients with APOE rs10164112 may be a risk factor for MCI (OR = 1.323, 95%CI 1.023–1.711, P = 0.033).

Conclusions

The polymorphisms of rs7561528, rs6733839 loci in the BIN1 gene, and rs1057233 loci in the SPI1 gene may be associated with the MCI in Chinese Han population. APOE gene was the risk factor of MCI, but further verification in a large sample population is still needed.

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Introduction

Mild cognitive impairment (MCI) is a cognitive impairment mode between normal aging and dementia, which is characteristics of cognitive or some mild memory impairment [1]. In general, MCI patients can perform activities of daily living (ADLs) [2]. MCI could be a risk factor for Alzheimer’s disease (AD), Parkinson’s disease, dementia with Lewy bodies, and vascular cognitive impairment. The incidence of AD in MCI is 10 times higher than that in normal subjects. The clinical incidence of MCI ranges from 6 to 85%. On average, 10% of patients turn to dementia every year, and the incidence of dementia rises to 80 to 90% after 6 years [3]. MCI includes three subtypes: amnestic MCI (a-MCI), single-domain non-memory MCI (sd-MCI), and multiple-domain slightly impaired MCI (md-MCI) [4]. MCI is now considered to be a multifactorial disease, with the type of occupation, blood glucose levels, and hypertension all being associated with the development of MCI [5]. Among them, genetics is the most important influencing factor of MCI and also AD. Therefore, it is important to investigate the pathogenesis and etiology of MCI for the early diagnosis and treatment of AD.

Some genetic changes may contribute to dementia in some older people. Bridging Integrator Protein-1 (BIN1) gene, located on chromosome 2, is a member of the BAR family and participates in physiological processes such as cell endocytosis and actin activation [6]. In recent years, with the progress of molecular biology, Harold et al. proposed that the BIN1 gene may be the pathogenic gene of AD. Some studies confirmed that the polymorphism of different BIN1 loci genes is related to the pathogenesis of AD [7,8,9].

SPI1 (Recombinant Human Spi-1 Proto-Oncogene) encodes PU.1, a transcription factor that occupied a major position in myeloid cells’ development and function. The heritability of AD was abundant in the PU.1 cistrome, suggesting the presence of a myeloid PU.1 target gene network in AD. Huang et al. [10] that experimentally altered PU.1 levels were related to various biological processes such as the expression of multiple genes in myeloid cells and mouse microglial cells’ phagocytic activity. Besides, it was previously reported that the delayed onset of AD and the decreased expression of SPI1 in monocytes and macrophages were associated with the minor allele of rs1057233 (G). The above results suggest that the downregulation of SPI1 expression may reduce AD’s risk by adjusting gene expression and function in myeloid cells.

The Apolipoprotein E (APOE) is the main one of the apolipoproteins in plasma and is also involved in the nervous system’s growth and repair. Several studies have confirmed that the APOE gene is related to the incidence of AD and MCI, but the abnormal risk accounts for only 20%, suggesting that other genes are involved in the pathogenesis of AD [11, 12]. Furthermore, the combination of steroidogenic acute regulatory-related lipid transfer domain 6 (STARD6) rs10164112-T allele and APOE ε 4 allele raised the risk of developing AD [13]. However, the frequency of the rs10164112-T allele was significantly lower in the Korean population with AD than in the healthy population [14]. At present, there is no study to evaluate the status of rs10164112 in the Chinese Han population with MCI, while the relationship between single nucleotide polymorphisms (SNPs) and MCI is not clear.

Therefore, to better understand the relationship between these genes, we conducted a study that examined the distribution of SNPsof BIN1, STARD6, RIN3, APOE, PICALM, SPI1, BZRAP1-AS, PFDN1/HBEGF, TMP21, MTHFR, TMEM106B, MC1R, CENPO, PVRL2 and KL genes to reveal the correlation between the polymorphisms and AD risk.

Materials and methods

Subjects

We performed a multicentric and prospective study. This study included 417 MCI patients and 508 healthy controls (HC) who were recruited between 2018 and 2020, who were all Han nationality over 50 years old in Wuxi City, Jiangsu Province, and its surrounding counties and communities. According to the revised Peterson criteria, MCI patients were diagnosed [15]. The subjects in the HC group must in keeping with the following conditions: illiteracy > 17 in the MMSE score scale, primary school > 20 points, junior high school, and above > 22, the CDR = 0 [16]. Each case meets the above diagnostic criteria. The clinical diagnosis was verified by a senior associate professor of psychiatry who had experience in using Structured Clinical Interview for DSM-IV.

The exclusion criteria were as follows: 1) People under the age of 50; 2) those with symptoms of psychosis or congenital mental retardation, history of head injury, severe endocrine diseases, severe cardiopulmonary, severe infectious diseases; 3) those who abuse alcohol or other substances. After a detailed description to the subjects or their representatives, written informed consents were obtained. In addition, the data on general demographics, such as age, sex, lifestyle, marital status, and occupation, were also surveyed.

SNPs selection

Firstly, we selected SNPs in the public HapMap database (ftp://ftp.ncbi.nlm.nih.gov/hapmap/). The criterion for selecting SNPs is that the minor allele frequency (MAF) ≥0.05 and r2 ≥ 0.8 in Beijing’s Han Chinese population (HCB). We selected eighteen SNPs for genotyping were screened out for analysis, specific information for each gene is given in Table 5 in Supplementary Material. Genes such as RIN3 and were selected due to their strong association with AD [17, 18]. We expect to find a link between these genes and MCI in Han Chinese populations as well.

Genotyping

All participants fasted for at least 8 h prior to blood collection. Each participant collected about 5 ml of peripheral blood in ethylenediamine tetraacetic acid (EDTA). Tiangen DNA isolation kit was used to extract genomic DNA from venous blood. The selected SNPs were genotyped by TaqMan SNP Genotyping Assay and ABI PRISM 7900 sequence detection system equipped with SDS2.1 software. In order to quality monitoring, a blind method was used to perform genotype analysis on participants’ status. Ten percent of the samples were genotyped once more, showed a coincidence rate of 99.2%. Two independent researchers scored the genotype data doubly. Deviation from the expectation of Hardy-Weinberg equilibrium (HWE) was evaluated in this queue.

Propensity score matching (PSM)

Rubin and Rosenbaum first proposed PSM in 1983 to eliminate the impact of confounding factors on the retrospective study results [18]. Propensity score matching used R (version 3.6.0) for 1: 1 matching and graph processing, and the matching tolerance is 0.002. Matching variables include gender, age, occupation, marriage, living mode.

Statistical analysis

We assessed HWE, the genotype frequency measurements and the allele frequency with SHEsis software (http://analysis.bio-x.cn/myAnalysis.php). We apply the Benjamini-Hochberg false discovery rate correction to account for multiple tests. SNPStats (https://www.snpstats.net/start.htm) was mainly used to assess the connection between SNPs and MCI risk under five genetic models (including dominant, dominant, recessive, dominant and logarithmic additive models). Then, a Logistic regression analysis was performed with SPSS 24.0.

Results

General demographic and characteristics after propensity score matching

A total of 925 eligible subjects were asked to participate. We included 311 pairs of data by propensity score matching analysis. A total of 311 healthy controls (HC) were enrolled, including 168 females. The average age was 66.05 ± 6.21 years (Table 1). MCI patients mean age was 66.08 ± 6.91 years, includes 163 females and 148 males. Statistically significant differences with regard to age and occupation before PSM between patients and controls. Therefore, we adjusted these differences with propensity score matching. Results of propensity score-matched analyses are displayed in Table 1. After PSM, there was no significant difference in the clinical characteristics of the two groups.

Table 1 Baseline comparison of influencing factors before and after PSM
Full size table

Gene polymorphisms of APOE

No significant association was observed for the distribution of APOE gene subtypes ε2/2, ε2/3, ε2/4, ε3/3, ε3/4, ε4/4, and their alleles ε2, ε3, ε4 between the two groups (P > 0.05, Table 1).

The distribution difference of genotype and allele frequencies between MCI group and HC group on different genes

Except for RIN3 rs10498633, MTHFR rs1801133, MC1R rs2228479, PVRL2 rs6859, and APOE rs7412, the remaining SNP genotypes of both groups were in HWE (Table 2). The analysis showed that rs7561528 alleles frequency in BIN1 differs between MCI patients and controls (χ 2 = 6.39, p = 0.01). The A allele frequency was 58 (9.6%) in the MCI group and 86 (14.3%) in the healthy control (HC) group. The distribution frequencies of AA, AG, and GG genotypes at rs7561528 loci in the MCI group were 5 (1.7%), 48 (15.8%), and 250 (82.5%), respectively. In HC group, they were 7 (2.3%), 72 (23.9%) and 222 (73.8%), respectively. When we compared the three genotypes’ distribution frequency between these two groups, we find a significant difference (χ 2 = 6.79, P = 0.03). Moreover, the T allele frequency at rs10164112 polymorphism in STARD6 was higher in MCI cases than in controls, and the difference was statistically significant (χ2 = 5.30, P = 0.02). However, no difference remains significant after Benjamini-Hochberg’s false discovery rate correction (adjusted P > 0.05). Comparing genotype and allele frequencies remaining of the SNPs across the overall sample of MCI patients and controls showed no significant differences. Specific information on each SNP is given in Table 5 in the Supplementary Material.

Table 2 Allele and genotype frequency of the SNPs
Full size table

Under five-inheritance models, the age and sex factors of MCI patients and controls were analyzed by unconditional Logistic regression. In the recessive model, there was a minimal association between the genotype frequency of BIN1 gene rs6733839 and MCI. (CC-CT vs. TT). Similarly, the genotype frequency of BIN1 rs7561528, the distribution frequencies of the codominant model (GG vs. AG), dominant model (GG vs. AG-AA), overdominant model (GG-AA vs. AG), and there was a nominally significant difference between the two groups with respect to log-additive model (P < 0.05, Table 3). As for the APOE rs10164112 polymorphism, the genotype frequencies showed a nominal association with MCI in the dominant model (CC vs. CT-TT), codominant model (CC vs. TT), log-additive model. However, when applying Benjamini-Hochberg to correct the false discovery rate, the association is not significant (P > 0.05 after correction).

Table 3 Logistic regression analysis of SNPs
Full size table

Forest map of the effect of gene polymorphism on MCI

The results of binary logistic regression are shown in Table 4 and Additional file 2: Fig. 1. Rs1057233 in SPI1 was the protective factor for MCI (OR = 0.742, 95%CI 0.633–0.868, P < 0.001) and rs10164112 in STARD6 was the risk factor for MCI (OR = 1.310, 95%CI 1.013–1.694, P = 0.040). In our study, the presence or absence of carrying APOEε4 was not statistically associated with the occurrence of MCI (P > 0.05).

Table 4 Multiple logistic regression analysis of mild cognitive impairment
Full size table

Discussion

The bridging integrator 1 (BIN1), also known as amphibian protein 2. It has been reported that its expression level in the brain tissue of patients with AD is increased [19] and is significantly related to the number of the pathology of neurofibrillary tangle (NFT) [20]. BIN1 is a major risk factor for late-onset AD (LOAD) [21]. BIN1 levels in patients with sporadic AD decreased by 87% compared with those in the non-dementia control group [22]. In addition, BIN1 protein plays a regulatory role in endocytosis, transport, immune system, calcium transient, and apoptosis [6]. BIN1 might be involved in the pathogenesis of AD in several ways, but the exact role is not clear. Since BIN1 affects the endocytosis pathway and intracellular transport mediated by Clathrin [23], it is speculated that it may be involved in the occurrence and development of AD through amyloid precursor proteins (APP) and APOE [6]. In addition, the interaction between BIN1 and tau protein was confirmed in both in vivo and in vitro models. It is speculated that BIN1 may be related to tau’s formation, the main pathological change of AD [8, 24].

There is evidence that BIN1 was related to episodic memory performance (in the context of genotyping patterns that involve binding to additional AD genes) [25]. Raj et al. was found that the expression level of BIN1 was affected by the BIN1 rs7561528 locus [26]. This polymorphic genotype was also closely related to right hippocampal atrophy [27]. Harold et al. Large-scale GWAS analysis of Caucasian AD patients found three BIN1 SNPs, including BIN1 rs7561528, were significantly associated with AD [28]. This is also confirmed by another large-scale GWAS [29]. Significant association between LOAD and rs7561528 polymorphism in Han Chinese population [30]. Similar results were obtained by a Meta-analysis of the relationship between AD in East Asians and Caucasians. Rs7561528 A-allele carriers possibly as a protective factor of AD susceptibility in all genetic patterns in mixed populations and allele and dominance patterns in East Asian populations, and individuals with A/G heterozygote genotype in these two populations are not susceptible to AD [31]. Previous studies have confirmed the association between APOE ε4 carriers and rs7561528 [32]. Meanwhile, a meta-analysis of 74,046 participants found that BIN1 rs6733839 SNP was related to AD [33]. Greenbaum et al. observed an association between well-established AD susceptibility SNP rs6733839 and episodic memory, and it can an important genetic risk factor for MCI among elderly individuals [34]. Based on the above studies, we have reason to believe that rs6733839 and rs7561528 gene polymorphism occupy a vital position in the pathogenesis of MCI by affecting the expression of BIN1. Our research found that two SNPs (rs6733839 and rs7561528) may be related to the pathogenesis of MCI among the elderly after using the one-to-one propensity score matching to reduce the hybrid effect. At present, the research on the role of BIN1 in AD is still in its infancy, which can understand the biological mechanism of cognitive decline and provide a new opportunity to find treatment sites. Additional functional genetic and independent replication analyses are necessary to elucidate these association epidemiological correlations.

After phagocytosis of amyloid-beta (Aβ), microglia initiate the activation of NALP3 inflammatory bodies and then activate caspase-1, which leads to the release of interleukin 1β (IL-1β) and promotes the occurrence of the inflammatory response [35]. NLRP3 inflammatory bodies are activated in AD, MCI brain, and APPPS1 mice. This activation may use substrates other than IL-1β to reduce Aβ phagocytosis and lead to Aβ deposition. Therefore, NLRP3 and Caspase-1 gene deletions can interfere with AD’s progression and improve cognitive function by blocking the formation of NLRP3/Caspase--1 inflammatory body [36]. The transcriptome and proteome analysis of microglia indicates that microglia homeostasis characteristics will be disturbed during aging and pathological state [37]. As a transcription factor, SPI1 directly regulates other AD-related genes expressed in myeloid cells such as microglia. SPI1 may amplify the genetic variation of other AD-related myeloid genes and regulate neuroprotective or neurotoxic microglial phenotype equilibrium. Huang et al. found that SPI1 rs1057233 and its labeled SNPs may regulate AD risk through changes in SPI1 expression and may represent potential disease sites [10]. Notably, rs1057233 was previously found to be associated with systemic lupus erythematosus [38], body mass index [39], and proinsulin levels [40], indicating that it may be involved in the link between AD, MCI, immune cell dysfunction, obesity, and diabetes.

New research suggests that neurosteroids such as diethylstilbestrol may be a new treatment for AD, indicating that lipid metabolism occupied a significant position in AD [41, 42]. Some studies have found that the behavior of STARD6 is similar to the steroidogenic acute regulatory protein (StAR), which controls the rate-limiting step of neurosteroid synthesis [35, 43].

Furthermore, STARD6 appeared in the hippocampus formation in rats, and its level was increased after pilocarpine-induced hippocampal neuron injury of rats [44]. The multivariate logistic regression model showed that STARD6 rs10164112 was significantly related to AD in the Korean population [14]. Yin et al. found that the rs10164112-T allele combined with the APOEε4 allele, resulting in an increased danger of AD [45]. Although the functional contribution of STARD6 in MCI is unknown, considering its role in AD, it may be involved in the pathogenesis of MCI. We found that the T allele of rs10164112 polymorphism was associated with a higher risk of MCI. The logistic regression model showed that the correlation was also significant in the total sample. Thus, it is possible to suggest that STARD6 participates in the pathogenesis of MCI.

At present, some researchers have reported that APOE ε4 may be a risk element for AD, and APOE ε2 may be a protective factor for AD [46,47,48]. However, our study showed that there was no difference in the subtypes of ε2/2, ε2/3, ε2/4, ε3/3, ε3/4, ε4/4, and alleles ε 2, ε 3, ε 4 of APOE gene between the two groups, which may be related to the fact that populations from different regions may have genetic heterogeneity of MCI.

Conclusion

In summary, the present study demonstrated that SPI1 and BIN1 variation may be the potential targets for MCI treatment and supported that STARD6 contributes to the risk of MCI. These results are helpful to understand the relationship among the pathogenesis, clinical diagnosis, and the SNPs of MCI in the Han population of southeastern China and provide directions for future research.

Limitations

Several limitations of this study should be taken into consideration and discussed. Firstly, this is a cross-sectional study, so it didn’t consider the order of exposure and the timing of outcome and the causal relationship between exposure and outcome. Secondly, it is worth noting that age and occupation were significant differences between the MCI patients’ controls before PSM. Our study eliminated these variables to reflect the role of genes, but previous studies have confirmed the influence of age and gender on MCI. As a disease affected by many factors, other variables such as marriage, nutritional and mental status should be added when collecting clinical data of MCI. Some other genes, such as rs744373 in BIN1, were also found to be significantly associated with the occurrence of MCI in the Han Chinese population, but our study did not include all relevant SNPs [49]. Therefore, in the future, we need to conduct large-scale genetic studies in several populations to replicate the results and explore whether different variables together with genes affect morbidity. Finally, our diagnostic criterion for inclusion of MCI patients was Petersen criteria. Although this inclusion criterion is more in line with the clinical diagnosis, it does not allow for the identification of categories of MCI due to lack of sensitivity and inclusiveness [50]. In addition, we have not analyzed in depth the relationship between MCI subgroups and gene polymorphisms. Therefore, in the future, we will make further subdivision of MCI in combination with neuropsychological and brain scans.

Availability of data and materials

The datasets generated during and/or analyzed during the current study are available from the corresponding author on request.

Abbreviations

PSM:

Propensity Score Matching

MCI:

Mild cognitive impairment

AD:

Alzheimer disease

SDAT:

Senile dementia of Alzheimer type

SNPs:

Single nucleotide polymorphisms

MMSE:

Mini-mental State Examination

HIS:

Hachinski Ischemic Scale

HDS:

Hastgawa Dementia Scale

CDR:

Clinical Dementia Rating

HWE:

Hardy-Weinberg equilibrium test

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Acknowledgements

Authors would like to profusely thank all individuals who supported and helped them to conduct this study.

Funding

We thank all of patients who volunteered to participate in the study. This study was supported by the National Natural Science Foundation of China (81801341), the Anhui Provincial Key R&D Programme (202004j07020030), the China International Medical Exchange Foundation (Z-2018-35-2002), and the National Clinical Key Specialty Project Foundation (CN). The funding body did not participate in the design, conduct, or writing of the study.

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Author notes

  1. Yelei Zhang, Xiaoyue Li, Yu Hu and Hongwei Yuan contributed equally to this work.

Authors and Affiliations

  1. Department of Psychiatry, Chaohu Hospital, Anhui Medical University, 64 North Chaohu Road, Hefei, 238000, China

    Yelei Zhang, Xiaoyue Li, Yu Hu, Xiaodong Wu, Yating Yang, Tongtong Zhao, Kai Zhang & Huanzhong Liu

  2. Anhui Psychiatric Center, Anhui Medical University, Hefei, 238000, China

    Yelei Zhang, Xiaoyue Li, Yu Hu, Xiaodong Wu, Yating Yang, Tongtong Zhao, Kai Zhang & Huanzhong Liu

  3. The Affiliated Kangning Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325007, China

    Yelei Zhang

  4. Department of Psychiatry, Wuxi Mental Health Center, Nanjing Medical University, Wuxi, 214151, China

    Hongwei Yuan, Ke Hu, Zhiqiang Wang & Guoqiang Wang

Authors
  1. Yelei Zhang
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  2. Xiaoyue Li
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  11. Kai Zhang
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Contributions

(I) Conception and design: K Zhang; (II) Administrative support: H Liu, K Zhang; (III) Provision of study materials or patients: Y Zhang, X Li, Y Hu; (IV) Collection and assembly of data: X Ning, T Zhao, K Hu, Z Wang, G Wang; (V) Data analysis and interpretation: Y Zhang, H Yuan, Y Yang; (VI) Manuscript writing: All authors; (VII) Final approval of manuscript: All authors.

Corresponding authors

Correspondence to Kai Zhang or Huanzhong Liu.

Ethics declarations

Ethics approval and consent to participate

Both Ethics and Research Committees from the Institution Ethical Committee approved the human study and gave their permission to involve human participants. All participants provided a signed written informed consent before their recruitment into the study. The human study was performed according to the Declaration of Helsinki. Approval from the Human Research and Ethics Committee of Wuxi Mental Health Center was obtained prior to the beginning of the study (WUXIMHCIRB2018–002).

Consent for publication

Not Applicable.

Competing interests

We don’t have any financial and non-financial competing interests.

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Supplementary Information

Additional file 1: Supplementary Table 5.

Detailed information of SNPs in fourteen GWAS-linked genesa.

Additional file 2: Fig. 1

OR (95%CI) forest map of the effect of gene polymorphism on MCI.

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Zhang, Y., Li, X., Hu, Y. et al. Evaluation of mild cognitive impairment genetic susceptibility risks in a Chinese population. BMC Psychiatry 22, 93 (2022). https://doi.org/10.1186/s12888-022-03756-y

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  • DOI: https://doi.org/10.1186/s12888-022-03756-y

Keywords

  • Propensity score matching (PSM)
  • Alzheimer disease (AD)
  • Mild cognitive impairment (MCI)
  • Polymorphisms

BMC Psychiatry

ISSN: 1471-244X

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