Using literature-based discovery to identify candidate genes for the interaction between myocardial infarction and depression
BMC Medical Genetics volume 20, Article number: 104 (2019)
A multidirectional relationship has been demonstrated between myocardial infarction (MI) and depression. However, the causal genetic factors and molecular mechanisms underlying this interaction remain unclear. The main purpose of this study was to identify potential candidate genes for the interaction between the two diseases.
Using a bioinformatics approach and existing gene expression data in the biomedical discovery support system (BITOLA), we defined the starting concept X as “Myocardial Infarction” and end concept Z as “Major Depressive Disorder” or “Depressive disorder”. All intermediate concepts relevant to the “Gene or Gene Product” for MI and depression were searched. Gene expression data and tissue-specific expression of potential candidate genes were evaluated using the Human eFP (electronic Fluorescent Pictograph) Browser, and intermediate concepts were filtered by manual inspection.
Our analysis identified 128 genes common to both the “MI” and “depression” text mining concepts. Twenty-three of the 128 genes were selected as intermediates for this study, 9 of which passed the manual filtering step. Among the 9 genes, LCAT, CD4, SERPINA1, IL6, and PPBP failed to pass the follow-up filter in the Human eFP Browser, due to their low levels in the heart tissue. Finally, four genes (GNB3, CNR1, MTHFR, and NCAM1) remained.
GNB3, CNR1, MTHFR, and NCAM1 are putative new candidate genes that may influence the interactions between MI and depression, and may represent potential targets for therapeutic intervention.
Myocardial infarction (MI) is a highly prevalent cardiovascular disease. The American Heart Association released a scientific statement in 2014 and recommended that depression should be considered a risk factor for adverse medical outcomes in patients with acute coronary syndrome . Depression may cause many adverse outcomes, including autonomic dysfunction , inflammation , endothelial dysfunction [4, 5], hyperactivity of the hypothalamic-pituitary-adrenal axis , and poor compliance , which subsequently lead to an increased risk of MI. Both the severity and cumulative duration of depressive symptoms have a negative impact on the MI prognosis . On the other hand, patients with MI may have a higher prevalence of depression . In an assessment of 10,785 patients with MI performed using a structured clinical interview, depression was common and persistent in MI survivors. Major depression was identified in approximately 1 of 5 (19.8%) patients hospitalized with MI . Thus, understanding the interaction between MI and depression is very important for the development of therapeutic interventions and determining patients’ needs.
The biomedical support discovery system (BITOLA) is a sophisticated bioinformatics tool that enables new discoveries, such as mining new information from the literature without using patient tissue samples, especially for identification of key candidates, and finding potentially new relationships among various biomedical concepts [11, 12]. Some researchers have used the text mining tools to identify candidate genes for diseases , such as multiple sclerosis and bilateral polymicrogyria [12, 14, 15]. In addition, using the BITOLA system, genes neural cell adhesion molecule 1 (NCAM1) and CD4 were identified as potential candidate genes in the interaction between depression and oral lichen planus .
Because the molecular mechanisms underlying the interaction between MI and depression remain unclear, the aim of the study is to identify new potential candidate genes linking these two diseases.
Extracting intermediate concepts from the BITOLA system
BITOLA is an interactive, literature-based, biomedical discovery support system (http://arnika.mf.uni-lj.si/pls/bitola2/bitola) . The purpose of the system is to generate new findings by discovering potentially new relationships between biomedical concepts, especially candidate genes that have aetiological relationships with diseases. Currently, the set of concepts in the BITOLA includes Medical Subject Headings (MeSHs), which are utilized to index human genes from the Human Genome Organization (HUGO) and Medline . By mining the Medline database, new information from the literature can be explored to identify new potential candidate genes linked to both MI and depression, and the potential new relationships can be discovered. Flow chart of the study design was shown in Fig. 1.
According to the proposed instructions of the tool, we used a closed discovery system in this study. Briefly, the item “Myocardial infarction” was entered as the starting concept X (Semantic types: disease or syndrome), and the items “Major Depressive Disorder” and “Depressive disorder” were entered as the end concepts Z (semantic types: Mental or Behavioral Dysfunction). Using those concepts, intermediate concepts Y were examined and extracted. In this study, the semantic types of intermediate concepts mainly referred to the “Gene or Gene Product”. Then, the intersection of the two gene sets of related concepts Y (gene or gene product) in total was retrieved for further analysis. These intermediate concepts were defined as the candidate intermediate molecules (CIMs).
Identifying differentially expressed intermediate concepts
Next, we tentatively filtered and evaluated the “Gene or Gene Product” by overviewing their mRNA (messenger ribonucleic acid) expression levels under different conditions (MI vs. control or depression vs. control). We reserved differentially expressed “gene or gene product” for the next analysis and excluded non-differentially expressed genes.
Gene expression datasets and statistical analysis
Gene expression datasets were obtained from the GEO database. The MI datasets used in this study are GSE48060, GSE83500, GSE97320, and GSE61145. GSE48060 was developed from the PBMCs of 52 patients diagnosed with MI and normal controls . The GSE83500 dataset was developed from the aortic wall of MI patients and healthy individuals. GSE97320 and GSE61145 were developed from the peripheral blood from 6 and sera from 24 MI patients and normal controls. . The depression datasets used in this study are GSE54562, GSE54563, GSE54564, GSE54565, GSE54566, GSE54567, GSE54568, GSE54570, GSE54571, GSE54572, and GSE54575 .
All GEO datasets were obtained from the GEO NCBI database, and the DEGs between the case group and the normal controls were analysed using the integrated GEO2R tool [21, 22]. Samples were assigned within a GEO series as either a normal control or case group depending upon the sample source and experimental classification. A T-test was used to sort out the DEGs. Multiple testing was applied using the Benjamini and Hochberg false discovery rate method. GEO2R provides a list of all probes (and corresponding gene aliases) ranked according to their degrees of differential expression. The top 250 probes were selected for the subsequent analysis, and finally the probes were converted into gene names.
Manual checking of the intermediate concepts
False-positive genes may be identified during literature mining, and manually checking is a precise method to recognize these genes. We manually checked the gene symbols in the co-occurrence literature together with MI and depression and excluded the ambiguous terms that could apply to other topics.
Evaluating expression patterns of the remaining “gene or gene product”
After manually checking the intermediate concepts, the remaining “Gene or Gene Product” were further filtered based on tissue-specific expression. For inclusion as candidate genes for the interaction of MI and depression, the genes from the list had to show a specific pattern of expression in both the heart and brain tissue; genes that did not satisfy the conditions were excluded. The Human eFP (“electronic Fluorescent Pictograph”) Browser (http://bar.utoronto.ca/efp_human/) was used to rapidly interpret the gene expression profiles; this program enables the user to easily visualize large-scale data sets based on representations of the human body . In the gene expression profiling studies, the gene symbol was entered, the “Absolute” mode was chosen for interpretation, and the “Nervous” or the “Circulatory Respiratory” data source was selected. After clicking “Go”, the representations of human samples are coloured based on the expression level of the gene of interest to generate expression “anatograms” for rapid interrogation. Using this procedure, we can determine whether the given “Gene or Gene Product” is most strongly expressed in the heart or brain tissue. A yellow-red scale is used depict the expression levels, with yellow denoting no expression in a given depiction of a tissue and red denoting maximal expression .
Intermediate concepts relevant to “Gene or Gene Product” for MI and depression
Using the adapted discovery algorithm with the starting concept X and end concept Z and its integration into the closed BITOLA system, we searched the entire intermediate concept Y relevant to “Gene or Gene Product”. We defined the starting concept X as “Myocardial Infarction” and end concept Z as “Major Depressive Disorder” or “Depressive disorder”. In this manner, 72 and 111 “gene or gene product” were suggested by the closed BITOLA system with the starting concept “Myocardial Infarction” and the end concepts “Major Depressive Disorder” and “Depressive disorder”, respectively. The intersection of the two gene sets of 128 related concepts Y (gene or gene product) in total was selected for further analysis, and we defined these selected genes as the CIMs.
Genes differentially expressed in both MI and depression
Analysis of the GSE48060, GSE83500, GSE97320, and GSE61145 for MI, GSE54562, GSE54563, GSE54564, GSE54565, GSE54566, GSE54567, GSE54568, GSE54570, GSE54571, GSE54572, and GSE54575 data sets for major depressive disorders obtained from the Gene Expression Omnibus (GEO) revealed 2750 differentially expressed genes (DEGs). After contrastive analysis, seven genes (IL-6, HLA-B, PPBP, PTPRC, SERPINA1, RERE, and PADI4) were found to overlap between the 128 CIMs and the DEGs from GSE83500, GSE97320, and GSE61145. Meanwhile, sixteen genes (FCGR3B, LPA, STAR, ESR1, GNB3, PAG1, NSF, ESD, LCAT, DMD, AR, CNR1, CPAMD8, HLA-B, MTHFR, and NCAM1) overlapped between the 128 CIMs and the DEGs from GSE54563, GSE54564, GSE54565, GSE54567, GSE54568, GSE54571, and GSE54572 (Table 1). We further explored the correlations between MI and depression by defining the overlap between the DEGs and the 128 CIMs (Tables 1 and 2).
To remove the genes that were not the original ideas for the “gene or gene product”, we used the most precise method, manual checking, to evaluate the abbreviations or the alternative names for these genes used in the literatures. Fourteen genes (FCGR3B, STAR, ESR1, PAG1, NSF, ESD, DMD, AR, CPAMD8, HLA-B, RERE, PADI4, PTPRC, and LPA) failed to pass the follow-up manual literature mining inspection due to ambiguous terms aroused by the defects in the literature mining itself and thus were removed from further analysis.
Common gene expression patterns in heart and brain tissues
In the analysis, we examined the gene expression patterns of the remaining genes by using the Human eFP Browser , which provides an overview of gene expression levels in the heart and brain. LCAT, CD4, SERPINA1, IL6, and PPBP failed to pass the follow-up filter, partly because these genes were not preferentially expressed in the heart tissue, which is the target of MI. Based on the tissue-specific expression patterns of the remaining genes, GNB3, CNR1, MTHFR, and NCAM1 were chosen as potential candidate genes for further analysis (Fig. 2, 3, 4, 5). The analysis showed that GNB3 was highly expressed in the heart ventricle and cingulate cortex of the brain (Fig. 2). CRN1 showed the highest expression in the heart atrium and cerebellum and nucleus accumbens of the brain (Fig. 3). Furthermore, MTHFR was overexpressed in the heart atrium and cerebellum and subthalamus nucleus of the brain (Fig. 4). Figure 5 shows the NCAM1 gene, which has high expression in the heart atrium and cerebral cortex and amygdala of the brain. Taken together, these results suggest that the overexpression of the GNB3, CNR1, MTHFR, and NCAM1 genes may contribute to the development of MI and depression and may play a role in the interaction between these two diseases.
In this study, we present for the first time a preliminary literature mining work exploring candidate genes related to MI and depression. By integrating data from the literature, we revealed 4 genes of interest (GNB3, CNR1, MTHFR, and NCAM1) that were likely to be associated with the aetiology of both MI and depression.
G proteins play an important role in intracellular signal transduction from the cell surface . A C3T polymorphism at nucleotide 825 in exon 10 of the G protein β3 subunit gene (GNB3/C825T) was demonstrated to be associated with enhanced intracellular signal transduction  and a variety of cardiovascular risk factors, including hypertension , obesity , dyslipidaemia , diabetes, and atherosclerosis . An association between GNB3/C825T and MI has also been reported . In addition to the roles mentioned above, studies have implicated a role for GNB3/C825T in depressive disorder [30,31,32] and the efficacy of antidepressants for the treatment of major depression disorders . In the present study, we found the highest GNB3 expression in the heart ventricle and cingulate cortex of the brain (Fig. 2), which was in accordance with the aetiology of depression  . Thus, further study of GNB3 is essential for assessment of the interaction between MI and depression.
Cannabinoid receptor 1 (CNR1) is one member of the seven transmembrane G-protein coupled receptor family and can regulate the levels of second messenger mainly through coupling with G proteins after activation by endocannabinoids [35, 36]. The CNR1 receptor may play a protective role through a wide variety of mechanisms, including inhibition of excessive noradrenaline release from the sympathetic nerve fibres , lowering inflammation, oxidative stress, fibrosis, and excitotoxicity, and enhancing blood flow . Therefore, cannabinoid receptor agonists can be considered as a prospective group of compounds for creation of drugs that are able to protect the heart against ischaemia-reperfusion injury in the clinical setting . Over the past few years, numerous studies have suggested that depression directly results in the hyperactivity of the hypothalamic-pituitary-adrenal axis . Studies have also suggested that CNR1 negatively regulates the hypothalamic-pituitary-adrenal axis function [40, 41]. In addition, mice lacking CNR1 can develop depressive-like behaviours or disorders . Specifically, in our study, high CNR1 expression in the brain areas was observed at the nucleus accumbens (Fig. 3), which has been suggested to be related to a lack of interest and other symptoms of depression . The evidence above suggests that targeting the endocannabinoid system may evolve as a novel therapeutic concept to limit the devastating consequences of MI and depression.
Methylenetetrahydrofolate reductase (MTHFR) is a key enzyme involved in homocysteine metabolism. An elevated total plasma homocysteine level has been demonstrated to be associated with both cardiovascular disease and depression [44, 45]. Because the C-to-T transition can cause reduced enzyme activity and elevated total plasma homocysteine levels, a positive relationship may exist between the MTHFR 677 C → T polymorphism and these two diseases, which has also been demonstrated [46, 47]. This polymorphism was also associated with a risk of MI [48, 49]. Moreover, the results confirmed those of very recent meta-analyses of genome-wide association studies, suggesting that MTHFR was a genetic overlap candidate gene that likely was shared between mood disorders and cardiovascular diseases . These findings provide some concrete directions for further research.
NCAM1, which is also known as CD56, is a member of the immunoglobulin superfamily . NCAM1 was first identified in brain tissue and is the best surface antigen for identification of human NK cells . Numerous studies have suggested that NCAM1 is a gene of interest associated with the pathogenesis of depressive disorder [52,53,54]. Experimental evidence showed that NCAM deficiency in mice resulted in a depression-like phenotype that could be reversed by an NCAM-derived peptide . In the present study, the NCAM1 gene was mainly expressed in the cerebral cortex and amygdala in the brain (Fig. 5), which are involved in the pathogenesis of depression . In addition to its role in depression, studies have also suggested its correlations with MI . One study demonstrated that NCAM1 was upregulated under metabolic stress in cardiomyocytes and suggested that NCAM1 was a cardioprotective factor . Hence, this evidence may have implications for the role of NCAM1 in communication between MI and depression that warrants further exploration.
In conclusion, using literature mining methods, the GNB3, CNR1, MTHFR, and NCAM1 genes were identified and directly or indirectly implicated in the regulation of MI and depression. Although additional research is needed to confirm these findings, our study reduced the candidate causal genes to a manageable number and might present potential new clues for future research.
Biomedical discovery support system
Candidate intermediate molecule
- CNR1 :
Cannabinoid receptor 1
Differentially expressed genes
Gene Expression Omnibus
- GNB3 :
G protein β3 subunit gene
- MTHFR :
- NCAM1 :
Neural cell adhesion molecule 1
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We thank Professor Bo Wang from the University of Lethbridge for reviewing our study. We thank Di Wang for language editing of this paper.
Dr. Yang is supported by the Key Laboratory of Myocardial Ischemia, Harbin Medical University, Chinese Ministry of Education (KF201604 and KF201519). Dr. Tu is supported by the National Natural Science Foundation of China (81671746 and 81401457) and the Special Financial Grant from the China Postdoctoral Science Foundation (2016 T90313). Dr. Yu is supported by the National Natural Science Foundation of China (81330033) and the National Key R&D Program of China (2016YFC1301100). These funding sources play roles in the interpretation of data and in writing the manuscript for publication.
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Dai, Z., Li, Q., Yang, G. et al. Using literature-based discovery to identify candidate genes for the interaction between myocardial infarction and depression. BMC Med Genet 20, 104 (2019). https://doi.org/10.1186/s12881-019-0841-8