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  • Research article
  • Open Access

miRNAs and target genes in the blood as biomarkers for the early diagnosis of Parkinson’s disease

†Contributed equally
BMC Systems Biology201913:10

https://doi.org/10.1186/s12918-019-0680-4

©  The Author(s). 2019

  • Received: 23 April 2018
  • Accepted: 4 January 2019
  • Published:

The Correction to this article has been published in BMC Systems Biology 2019 13:20

Abstract

Background

Parkinson’s disease (PD) is the second most common neurodegenerative disease, and it is a multifactorial disease with no definite diagnostic index. The aim of this study is to construct a molecular network to find molecules that play important roles in the progression of PD with the goal of using them diagnostically and for early intervention.

Results

We downloaded two gene expression profiles (GSE54536 and GSE100054) from the Expression Omnibus (GEO) database to analyze possible markers. The Genes were analyzed with GEO2R. There were 1790 and 967 differentially expressed genes (DEGs) in GSE54536 and GSE100054 respectively. A total of 125 genes co-exist in the DEGs of the two data sets. KEGG pathway analysis showed that 125 DEGs were enriched in Aldosterone synthesis and secretion, Gap junctions, Platelet activation, Rap1 signaling pathway, and Estrogen signaling pathway. There were 20 hub genes among 125 DEGs analyzed by PPI that involved in Platelet activation, Inflammatory response, Innate immune response, B cell receptor signaling, Stimulatory C-type lectin receptor signaling, Lipopolysaccharide response, Leukocyte migration, and Regulation of cell proliferation. Additionally, 42 differences in miRNAs were found in GSE100054. We constructed a miRNA-mRNA regulatory network depicting interactions between the predicted genes and the 125 DEGs. 34 miRNA-mRNA pairs were obtained. We found GNAQ and TMTC2 were the most important mRNAs in the network analyzed by Cytoscape APP centiscape, and their degrees in centiscape2.2 were all 10. has-miR-142 was the most important miRNA (the highest degree is 4 in centiscape2.2), which forms miRNA-mRNA pairs with GNAQ, TMTC2, BEND2, and KYNU.

Conclusions

This study provides data of potential biomarkers and therapeutic targets for PD diagnosis and treatment. Among them, hsa-miR-142 is a critical miRNA in the PD network, and may be involved in PD progression by regulating GNAQ, TMTC2, BEND2, and KYNU.

Keywords

  • Parkinson’s disease
  • Functional enrichment analysis
  • Protein–protein interaction
  • miRNA-mRNA pairs

Background

Parkinson’s disease (PD) is the second most common neurodegenerative disease behind Alzheimer’s disease. It has a 1% incidence in people 65 years of age [1], and 4% in those 80 years of age [2]. Early stage PD patients showed only non-motor symptoms (NMS), such as constipation, olfactory dysfunction, depression, and sleep disorders [3]. Clinical motor symptoms included bradykinesia, stiffness, tremor and postural instability, and asymmetric seizures. Other motor dysfunctions included gait and posture changes (manifesting as panic gait or walking forward chaotically with rapid bending), speech and swallowing difficulties, and masked expressions [4]. When people displayed clinical symptoms, there was an associated loss of at least 50% of dopaminergic neurons in the substantia nigra (SN), and an 80% decrease in striatal DA content. Early identification of PD molecular biomarkers is critical for initiating timely treatment prior to the onset of motor symptoms. This is especially true given that 90% of rapid eye movement sleep behavior disorder (RBD) patients develop PD in most cases, NMS precede motor symptoms [5]. However, these NMS are easily overlooked. Therefore, the early recognition and treatment of NMS is not only one of the most important and difficult issues in the current diagnosis and treatment of PD, but also directly affects the overall therapeutic effect on PD patients. Currently, the pathogenesis of PD is not clear. PD is caused by a variety of factors, including age, genetics, oxidative stress, calcium overload, mitochondrial dysfunction, and environmental factors. Previous studies have focused on individual pathogenic factors, but PD is not caused by a single factor, and there is cross-talk among many of the causal elements. These factors form a regulatory network, and we should re-examine PD adopting a network perspective to better comprehend the complex interplay of causes. Due to the scarcity of brain tissue, it is necessary to establish a database of clinical data of PD patients and bioinformatic libraries to explore incidence, related risk factors, biomarkers, occurrence, and development.

MicroRNAs (miRNAs) are a class of noncoding RNA molecules that are single-stranded and 19–25 nucleotides long. They are involved in proliferation, apoptosis, differentiation, metabolism, and development of cells by degrading or mediating translation by complementarity to the 3’UTR of target RNAs [6–8]. Since miRNAs are a key mechanism for controlling gene expression, regulatory miRNAs and their target genes can serve as biomarkers for the early diagnosis of PD. miRNAs and their derivatives have great potential in the diagnosis and treatment of diseases [8–11].

With the development of high-throughput sequencing technology, existing data can be used for screening, comparing, and analyzing information that otherwise would not be available from data collected from only a few individuals. Data from GEO datasets regarding the expression profiling of peripheral blood were used to screen normal controls and PD patients. Determining differentially expressed genes(DEGs) and signaling pathways helped us identify key molecules and screening targets for the early diagnosis and development of PD. Here, we used two datasets, GSE54536 and GSE100054, of peripheral blood RNA and miRNA from PD patients and determined differences in mRNAs between controls and PD samples. The DEGs were introduced into the DAVID website, the differentially expressed genes were annotated, and the biological processes, cell components, molecular functions, and signaling pathways involved in DEGs of PD patients were analyzed. Differentially expressed microRNAs (DEMs) were introduced into Targetscan website to predict the miRNA target genes. The analyzed mRNAs and miRNAs were jointly analyzed to screen for miRNA-mRNA pairs. To explore the pathogenesis of PD from the perspective of transcriptomes, these miRNA-mRNA pairs may be potential targets for future research in the prevention and treatment of PD.

Methodology

Data collection

We searched several key words, including “Parkinson’s Disease”, “blood”, “Expression profiling by array”, “Homo sapiens” and “20130101 to 20170531” in the GEO datasets. Two GSEs were selected in this study: GSE54536 and GSE100054. GSE54536 contains 4 controls and 4 untreated patients with stage 1 PD (Hoehn–Yahr scale). GSE100054 contains 9 controls and 10 PD patients. Figure 1 depicts the workflow of the data processing and analysis.
Fig. 1
Fig. 1

Flow chart of the data processing and analysis

Differentially expressed mRNAs and miRNAs selection

GEO2R (http://www.ncbi.nlm.nih.gov/geo/geo2r/) is an online analysis tool used to perform comparisons between groups of samples in a GEO dataset to identify DEGs or DEMs across experimental conditions. In our study, we obtained DEGs from two datasets, including GSE54536 and GSE100054. When we selected the DEGs, the cut-off criteria were P<0.05 and fold change ≥1.5. We analyzed the DEMs in the GSE100054 according to the cut-off criterion P<0.05 and fold change ≥2. The dataset of GSE54536 was analyzed with Illumina HumanHT-12 V4.0 expression beadchip, and GSE100054 was analyzed with Affymetrix Human Clariom D Assay.

Function enrichment analysis and KEGG pathway analysis

The co-differential gene functional features in GSE54536 and GSE100054 related to PD were analyzed with DAVID [12]. DAVID is a web-based system that incorporates information from different resources to detect biological themes within the list of candidate genes. This includes evaluating the enrichment significance of gene ontology (GO) terms, and an analysis of the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways. Biological process, cellular components, and molecular function are included in GO terms. We defined a P value of less than 0.05 as significantly enriched.

Protein-protein interaction (PPI) network construction analysis and identification of hub genes

The co-differential genes in the two datasets, GSE54536 and GSE100054, were used to construct the protein-protein interaction (PPI) network using the Search Tool for the Retrieval of Interacting Genes/Proteins (STRING, https://string-db.org/). We established the PPI network using only overlapped differentially expressed genes, and set confidence score cutoffs as greater than 0.4. Next, Molecular Complex Detection (MCODE) in Cytoscape was applied to determine the hub genes. Degree cutoff = 2, node score cutoff = 0.2, and K-core =2, and max. Depth = 100.

Prediction of miRNA targets and construction of the miRNA-mRNA network

The DEMs in GSE100054 were used to predict the target genes using Targetscan (http://www.targetscan.org/). Targetscan is an online system that can predict target mRNA according to the miRNA seed region seeking the complementary specific sequence. In this study, we determined the intersection between the predicted miRNA target genes and the co-differentially expressed genes of GSE54536 and GSE100054. We then used these miRNA-mRNA regulatory networks and Cytoscape to visualize interactions between miRNAs and their potential targets in PD.

Results

Identification of DEGs and DEMs

To detect the DEGs in GSE54536 and GSE100054, we set a cutoff of P<0.05 and a fold change of ≥1.5, and for the DEMs in GSE100054, P<0.05 and a fold change of 2. GEO2R analysis indicated the presence of 1790 and 967 DEGs in GSE54536 and GSE100054 respectively (Fig. 2a and b). In GSE54536 and GSE100054, there are 125 genes that co-exist in the DEGs. Among them, 17 genes are upregulated and 14 genes are downregulated compared to controls. We then screened out 42 DEMs from GSE100054 using the GEO2R analysis system.
Fig. 2
Fig. 2

Volcano plot show the DEGs in GSE54536 and GSE100054

Functional enrichment and KEGG pathway analysis

For the DEGs, the most significantly enriched GO terms on biological processes (BP) are Cell adhesion, Blood coagulation, G-protein coupled purinergic nucleotide receptor signaling, Inflammatory response, and B cell receptor signaling (Fig. 3a). We listed all the BP, cellular components (CC) (Fig. 3b), molecular functions (MF) (Fig. 3c), and KEGG pathways according to the GO terms (P < 0.05). In addition, the KEGG pathway analysis showed that DEGs were enriched in Aldosterone synthesis and secretion, Gap junctions, Platelet activation, Rap1 signaling, and Estrogen signaling (Fig. 3d).
Fig. 3
Fig. 3

Enriched Gene Ontology terms of differentially expressed genes obtained from the Database for Annotation a biological process (BP); b cellular component (CC); c molecular function (MF). d enriched KEGG pathway

PPI network and identification of hub genes

125 overlapping DEGs between GSE54536 and GSE100054 were used to establish the protein-protein (PPI) network by STRING, which composed 125 nodes and 93 edges. Subsequently, we analyzed the STRING results using CytoScape, and 20 genes in the PPI network were identified as hub genes in PD. Among others, these included ITGAX, TLR5, SLC11A1, SRC, CLEC7A, CD79A, LCK, and NLRP3 (Fig. 4a). Degree cutoff, node score cutoff, and k-core were set to 2, and max depth was set to 100.
Fig. 4
Fig. 4

a show the protein-protein interaction network of DEGs in GSE54536 and GSE100054. The blue genes in a showed the common genes and from red to yellow show the top 20 hub genes in the network according to the criterion. b, c and d show the 3 clusters using MCODE

We selected 3 clusters from the PPI network using MCODE, with the most significant cluster consisting of 5 nodes and 10 edges. MCODE analysis also showed that each cluster contained one “seed” gene. NRLRP3, XCL2, and NT5E are the seed genes in the three clusters respectively (Fig. 4b, c and d). The BP of hub genes were involved in Platelet activation, Inflammatory response, Innate immune response, B cell receptor signaling, Stimulatory C-type lectin receptor signaling, Lipopolysaccharide response, Leukocyte migration, and Regulation of cell proliferation (P<0.01).

Construction of a miRNA target regulatory network

In the GSE100054 dataset, there are 42 differentially expressed pre-miRNAs. We examined the mature expression of these miRNA using miRBase. All mature miRNAs were uploaded to DIANA TOOLS (http://diana.imis.athena-innovation.gr/DianaTools/index.php?r=microT_CDS/index) to predict the targets of each. The overlapping mRNAs between the DIANA TOOLS predictions and the DEGs in GSE54536 and GSE100054 were then used to construct the regulatory network. After determining the intersection between the 125 DEGs and the predicted target genes of the DEMs, the miRNAs with no target genes or a negative regulatory relationship were discarded. That left 12 mRNAs and 17 miRNAs remaining, making up 34 miRNA-mRNA pairs. The relationships between mRNAs and miRNAs is shown in Fig. 5. Diamond-shaped nodes represent target genes, and rectangular nodes represent miRNAs. Green rectangles represent downregulation of miRNAs in GSE100054, while red nodes represent upregulation miRNAs. Green diamonds show the co-downregulated mRNAs in GSE54536 and GSE100054, and red diamonds show the co-upregulated mRNAs in these two datasets.
Fig. 5
Fig. 5

miRNA-mRNA regulation network of Parkinson’s disease. Diamond nodes represent target genes and rectangle nodes represent miRNAs. Green rectangles represent downregulation miRNAs in GSE100054, red rectangle represent upregulation miRNA. Green diamonds show the co-downregulated mRNA in GSE54536 and GSE100054, red diamonds show the co-upregulated mRNA in these two datasets

Among the 34 miRNA-mRNA pairs, only one miRNA was found to be increased in PD peripheral blood, while the other miRNAs were found to be reduced. Hsa-miR-3690 was elevated, and has a negative regulatory relationship with SLC30A4. We used Cytoscape APP centiscape 2.2 to analyze the network, and found that GNAQ and TMTC2 played important roles (centiscape2.2 degree = 10), and has-miR-142 was the most significant (centiscape2.2 degree = 4). GNAQ was negatively regulated by multiple miRNAs, including hsa-miR-142, hsa-miR-15b, hsa-miR-29b-2, hsa-miR-3136, hsa-miR-4659a, hsa-miR-548f, hsa-miR-548 g, hsa-miR-5582, hsa-miR-5692c, and hsa-miR-582. TMTC2 was negatively regulated by multiple miRNAs including hsa-miR-142, hsa-miR-29b-2, hsa-miR-4324, hsa-miR-4477a, hsa-miR-4659a, hsa-miR-548f, hsa-miR-548 g, hsa-miR-5692c, hsa-miR-582, and hsa-miR-590. Finally, BEND2 was negatively regulated by miRNAs including hsa-miR-142, hsa-miR-4659a, hsa-miR-4795, and hsa-miR-590. Given these observations, hsa-miR-142 is the most versatile and significant miRNA regulator in the network, and can impact GNAQ, TMTC2, BEND2 and KYNU (Fig. 5).

Discussion

PD is a serious neurodegenerative disease. Onset and symptoms are influenced by genetic background, chronic inflammation, environmental toxicity, oxidative stress, mitochondria dysregulation, and calcium overload. Patients are often diagnosed with Parkinson’s disease via their motor symptoms, however this is far beyond the early stages of the disease. Prior to diagnosis, many people express no specific dyskinesia and instead show non-motor symptoms including mood and sleep disorders, visual impairment, fatigue, and depression [13, 14]. However, these nonspecific manifestations are rarely associated with Parkinson’s disease. Therefore, it is difficult to diagnose early-stage Parkinson’s disease. Our data suggest that Parkinson’s disease is a disease caused by multiple factors within multiple complex systems, with abundant crossovers between signaling pathways. For each patient, a comprehensive analysis focusing on biological function and interactions of PD-related genes can provide us valuable information to understand the pathogenesis of their individual disease. Our high throughout technique provides us with a powerful tool to analyze general characteristics and search for novel preventive and therapeutic interventions.

In this study, a total of 125 DEGs were found in GSE54536 and GSE100054, including 17 upregulated genes and 14 downregulated genes. All the DEGs were enriched in Cell adhesion, Blood coagulation, G-protein coupled purinergic nucleotide receptor signaling, Inflammatory response, and B cell receptor signaling. 20 genes were identified as hub genes in PD, including ITGAX, TLR5, SLC11A1, SRC, CLEC7A, CD79A, LCK, and NLRP3, due to their high degrees within the PPI network.

The results of this paper demonstrate that 17 miRNAs and 12 mRNAs form the regulatory network. Studies have confirmed that genes modulated during the pathogenesis of Parkinson’s disease appear in our regulatory network, and include CD79A [15] and NLRP3 [16, 17] in addition to miRNAs associated with PD models, including miR-142-3p [18], miR-15b-5p [19–21], and miR-590-3p [22] (Table 1).
Table 1

miRNAs/genes confirmed related to PD

miRNAs/genes

Disease

Variation tendency

Reference

CD79A

PD

down-regulated

Kobo H [15],

NLRP3

PD (mice Rotenone Exposure)

up-reglulated

Martinez EM [16], Zhou Y [17]

miR-142-3p

PD(patients plasma)

down-regulated

Chen L [18]

miR-15b-5p

PD(MPP+ damaged SH-SY5Y cells)

down-regulated

Xie N [19, 20]

miR-590-3p

(MPP+)-treated MES23.5 and SH-SY5Y cells

down-regulated

Wang J [22]

Here, a thorough analysis of the regulatory network revealed an extremely high degree of hsa-miR-142, hsa-miR-582, hsa-miR-590, hsa-miR-4659a, hsa-miR-548f, hsa-miR-548 g, hsa-miR-5582, GNAQ, TMTC2, and BEND2, indicating that these miRNAs and mRNAs may play key roles in the development of PD. miR-142 is highly correlated with inflammatory and immune responses in different physiological and disease [23]. There are two mature forms of miR-142: miR-142-3p and miR-142-5p. miR-142 is abundant in cells of hematopoietic lineage, and plays an important role in their differentiation [24, 25]. More importantly, miR-142 appears to have a strong effect on immune responses in a variety of physiological and disease states [26–29]. This is likely due to the fact that miR-142 targets genes belonging to the immune response pathway, and therefore can have a wide range of effects on multiple downstream signaling pathways. A recent study focused on plasma miRNAs, and showed that miR-142-3p was down regulated in PD patients compared with healthy controls [18]. Hsa-miR-582 function was involved in the regulation of cell proliferation, cell cycle progression, and apoptosis [30, 31]. hsa-miR-590 can negatively regulate the inflammatory response, chemokine secretion [32], and reactive oxygen biosynthesis [33]. However, the functions of hsa-miR-4659a, hsa-miR-548f, hsa-miR-548 g, and hsa-miR-5582 are not clear. G Protein Subunit Alpha Q (GNAQ) is involved in modulating or transducing various transmembrane signaling systems related to PD and ALS. It also can regulate B-cell selection and survival, and is required to prevent B-cell-dependent autoimmunity. TMTC2 is an integral membrane protein localized in the endoplasmic reticulum (ER). This protein plays a role in calcium homeostasis in the ER [34]. BEN Domain Containing 2 (BEND2) encodes a protein that participates in protein and DNA interactions during chromatin restructuring and transcription. These three genes (GNAQ, TMTC2, BEND2) were negatively regulated by miR-142 within the miRNA-mRNA network. These novel miRNAs and mRNAs, not previously confirmed to change in PD patients, may be new targets for intervention.

Our results suggest that miRNA-142 may be used as a potential biomarker. It may affect PD development via interaction with GNAQ, TMTC2, and BEND2. However, there is very little know about the relationship between specific genes and PD. While our results must be validated in vitro and in vivo, we believe that the genes we’ve identified could be potential targets for the diagnosis and treatment of PD. This study provides important information for the elucidation of the physiological and pathological processes governing PD.

Notes

Abbreviations

BP: 

Biological process

CC: 

Cellular component

DEGs: 

the differentially expressed genes

DEMs: 

the differentially expressed miRNAs

ER: 

endoplasmic reticulum

GO: 

gene ontology

KEGG: 

Kyoto Encyclopedia of Genes and Genomes

MF: 

Molecular Function

miRNA: 

microRNA

PD: 

Parkinson’s disease

PPI: 

protein-protein interaction

RBD: 

rapid eye movement sleep disturbances

SN: 

Substantia Nigra

Declarations

Funding

This work was supported by grants from the National Natural Science Foundation of China (No.31300897), Foundation of Hebei Educational Committee, China (No.ZD2015012).

Availability of data and materials

The datasets analyzed in the current study download from: https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE100054; and https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE54536.

All data generated or analyzed during this study are included in this published article.

Authors’ contributions

Xiaoting Liu searched for the applicable GSEs from GEO datasets. Jinhu Chen analyzed the DEGs and DEMs. Tianyuan Guan analyzed the protein-protein internet.Hui Yao was responsible for data visualization. Wenpei Zhang analyzed functional enrichment and KEGG pathway. Zhenlong Guan constructed miRNA-mRNA regulation network. Yanqin Wang was a major contributor in writing the manuscript.All authors read and approved the final manuscript.

Ethics approval and consent to participate

This study does not contain any studies with human participants or animals performed by any of the authors. Informed consent was obtained from all individual participants included in the study.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Publisher’s Note

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Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors’ Affiliations

(1)
Department of Physiology, College of Life Sciences, Hebei Normal University, Shijiazhuang, China
(2)
Department of Endocrinology, Hebei General Hospital, Shijiazhuang, China
(3)
Department of Neurology, Hebei General Hospital, Shijiazhuang, China

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© The Author(s). 2019
corrected publication 2019

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