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Association of EPCR Polymorphism rs867186-GG With Severity of Human Malaria.

ABSTRACT: Background:Cerebral malaria (CM) is characterized by the sequestration of Plasmodium-infected erythrocytes (pRBCs) to host brain microvasculature beds via P. falciparum erythrocyte membrane protein 1 (PfEMP1). Under normal conditions, activated protein C (APC) bound to endothelial protein C receptor (EPCR) has cytoprotective properties via the activation of protease-activated receptor 1 (PAR1). During malaria infection, pRBCs transports PfEMP1 to the membranes to bind EPCR in the same region as APC. As a result, APC is less capable of inducing cytoprotective effects via PAR1. Two studies involving adult malaria patients revealed that EPCR rs867186-GG allele is associated with protection against severe malaria, while three other studies involving child malaria patients could not show association between EPCR rs867186-GG genotype and severe malaria or increased mortality among children with CM. Methods:We examined the association between the EPCR rs867186-GG genotype and the protection against cerebral malaria. Peripheral blood samples were collected from 47 malaria patients and 34 healthy individuals from a study conducted from 2004 to 2007 at the NSCB Medical College Hospital in India. CM and malaria-associated complications were defined based on WHO criteria. Genomic DNA was isolated from the peripheral blood mononuclear cells. Primer sequences were designed to contain rs867186 of the PROCR gene (NM 006404) and were used to amplify a 660 bp product as described before. PCR products were purified, and DNA sequences were determined by Sanger Sequencing (Genewiz, NJ). Nonparametric tests were used to compare the groups. To analyze differences in allele frequencies, we used chi-squared or Fisher's exact tests for categorical variables if the expected values were less than 5. P-value <0.05 was considered statistically significant. Results:Our results showed significantly higher rates of AG and GG genotypes in CM patients compared to mild malaria (P = 0.0034). Conclusion:Our results indicate that rs867186-GG or rs867186-AG genotypes are not associated with protection against HCM.

SUBMITTER: Cespedes JC

PROVIDER: S-EPMC7050639 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Association of EPCR Polymorphism rs867186-GG With Severity of Human Malaria.

Cespedes Juan Carlos JC Hibbert Jacqueline J Krishna Sri S Yan Fengxia F Bharti Praveen K PK Stiles Jonathan K JK Liu Mingli M

Frontiers in genetics 20200224

<h4>Background</h4>Cerebral malaria (CM) is characterized by the sequestration of <i>Plasmodium</i>-infected erythrocytes (pRBCs) to host brain microvasculature beds <i>via P. falciparum</i> erythrocyte membrane protein 1 (PfEMP1). Under normal conditions, activated protein C (APC) bound to endothelial protein C receptor (EPCR) has cytoprotective properties <i>via</i> the activation of protease-activated receptor 1 (PAR1). During malaria infection, pRBCs transports PfEMP1 to the membranes to bin ...[more]

PMID: 32153634

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Project description:BackgroundThe rs867186 single-nucleotide polymorphism in the PROCR gene (g.6936A > G, c.4600A > G) results in a serine-to-glycine substitution at codon 219 of endothelial protein C receptor (EPCR). We performed a case-control study followed by an updated meta-analysis of the association between this polymorphism and the risk of venous thromboembolism (VTE).Objective and methodsWe enrolled 263 VTE patients and 320 unrelated healthy controls for the case-control study. The total number of cases and controls for the meta-analysis were 5,768 and 30,017, respectively. A new online MetaGenyo Statistical Analysis System software was used to perform the current meta-analysis. Furthermore, a reproducibility study was conducted to validate our results.ResultsAmong well-defined thrombosis risk factors, Factor V Leiden was more frequent in the VTE group (p < 0.001), while there was no difference in mutation frequency of prothrombin 20210G>A polymorphism between the two groups. There was no difference in the mutation frequency of Factor V Leiden and prothrombin 20210G>A between cases with and without provoking factors and cases with and without VTE recurrence. The rs867186 "G" carriership did not influence the risk of VTE [odds ratio (OR) 1.339; 95% confidence interval (CI): 0.904-1.984] in our study. No significant differences could be demonstrated among the rs867186 genotype frequencies between VTE cases with and without provoking factors (p = 0.430). PROCR rs867186 was associated with an OR of 1.72 (95% CI: 0.95-3.13, p = 0.075) in terms of VTE recurrence. In the meta-analysis, a significant association was found between EPCR Ser219Gly polymorphism and VTE under the dominant model (OR = 1.27, 95% CI: 1.11-1.46, p = 0.0006), the recessive model (OR = 1.60, 95% CI: 1.26-2.04, p = 0.0001), the GG vs. AA contrast model (OR = 1.64, 95% CI: 1.28-2.09, p = 0.0001), and the GA vs. AA contrast model (OR = 1.24, 95% CI: 1.08-1.43, p = 0.002).ConclusionThe rs867186 was not associated with the first VTE risk in our case-control study; however, a tendency to VTE recurrence was observed. Based on the results of our reproducibility study, MetaGenyo is acceptable for meta-analysis in case of genetic epidemiology studies. Although the risk conferred by the rs867186 is mild in all meta-analyses, including ours, identifying patients carrying the minor allele might have an impact on personalized VTE risk assessment, risk-score calculation, and patient management.

Dataset Information

Association of EPCR Polymorphism rs867186-GG With Severity of Human Malaria.

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Association of EPCR Polymorphism rs867186-GG With Severity of Human Malaria.

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