New candidate genes for ST-elevation myocardial infarction
S Cederström1, P Lundman1, L Folkersen2
1Division of Cardiovascular medicine, Department of Clinical Sciences, Karolinska Institutet Danderyd Hospital (KI DS), Stockholm, Sweden.
Insights
Researchers identified seven genes linked to ST-elevation myocardial infarction (STEMI) by analyzing leukocyte gene expression. This study offers new insights into coronary atherothrombosis mechanisms in STEMI patients.
Area of Science:
- Cardiovascular Biology
- Molecular Genetics
- Thrombosis Research
Background:
- Mechanisms of coronary atherothrombosis in ST-elevation myocardial infarction (STEMI) remain unclear despite extensive atherosclerosis research.
- Investigating leukocyte gene expression in STEMI patients can elucidate underlying causes of coronary atherothrombosis.
- Distinguishing primary gene expression changes from secondary inflammation is crucial for understanding STEMI pathogenesis.
Purpose of the Study:
- To identify candidate genes involved in STEMI by analyzing leukocyte gene expression.
- To differentiate primary genetic factors from secondary inflammatory responses in STEMI.
- To uncover novel molecular targets for STEMI treatment and prevention.
Main Methods:
- Gene expression analysis of leukocytes from 51 STEMI patients at acute phase (P1), 24-48h (P2), and 3 months (P3).
- Utilized Affymetrix Human Transcriptome Array 2.0 for comprehensive gene expression profiling.
- Excluded secondary inflammatory gene expression changes by comparing P1 to P3 (convalescent) samples, focusing on genes differentially expressed in P1.
Main Results:
- Identified seven genes differentially expressed in the acute phase of STEMI compared to convalescence.
- Three genes (ABCG1, RAB20, TMEM2) were upregulated, and four genes (ACVR1, NFATC2IP, SUN1, TTC9C) were downregulated in STEMI patients.
- These seven candidate genes were also found to be highly expressed in carotid atherosclerotic plaques, suggesting a role in atherosclerosis.
Conclusions:
- Seven candidate genes were identified as potentially involved in the mechanisms of STEMI.
- The study's unique approach excluded secondary inflammatory responses, providing a clearer view of primary genetic involvement.
- Further studies are needed to replicate these findings and validate the role of these genes in STEMI pathogenesis.
Background:
Despite extensive research in atherosclerosis, the mechanisms of coronary atherothrombosis in ST-elevation myocardial infarction (STEMI) patients are undetermined.
Objectives:
Our aim was to find candidate genes involved in STEMI by analysing leucocyte gene expression in STEMI patients, without the influence of secondary inflammation from innate immunity, which was assumed to be a consequence rather than the cause of coronary atherothrombosis.
Methods:
Fifty-one patients were included at coronary angiography because of STEMI. Arterial blood was sampled in the acute phase (P1), at 24-48 h (P2) and at 3 months (P3). Leucocyte RNA was isolated and gene expression analysis was performed by Affymetrix Human Transcriptome Array 2.0. By omission of up- or downregulated genes at P2, secondary changes from innate immunity were excluded. Genes differentially expressed in P1 when compared to the convalescent sample in P3 were determined as genes involved in STEMI.
Results:
Three genes were upregulated at P1 compared to P3; ABCG1 (P = 5.81 × 10-5 ), RAB20 (P = 3.69 × 10-5 ) and TMEM2 (P = 7.75 × 10-6 ) whilst four were downregulated; ACVR1 (P = 9.01 × 10-5 ), NFATC2IP (P = 8.86 × 10-5 ), SUN1 (P = 3.87 × 10-5 ) and TTC9C (P = 7.18 × 10-6 ). These genes were also highly expressed in carotid atherosclerotic plaques.
Conclusions:
We found seven genes involved in STEMI. The study is unique regarding the blood sampling in the acute phase and omission of secondary expressed genes from innate immunity. However, the results need to be replicated by future studies.
Related Concept Videos
01:30Acute Coronary Syndrome I: Introduction
01:19Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations
01:30Acute Coronary Syndrome III: Diagnostic Studies
01:26Coronary Artery Disease II: Pathophysiology
01:20Blood Studies for Cardiovascular System I: Cardiac Biomarkers
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
01:05Single Nucleotide Polymorphisms-SNPs