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Gene expression analysis of primary graft dysfunction in adult heart transplant recipients: A cohort study
Samuel Padovani Steffen1,2, Alvaro Monteiro Perazzo1,2,3, Shirlyne Fabianni Dias Gaspar1,2
1Heart Transplant Unit, Heart Institute of Clinical Hospital of University of Sao Paulo Medical School, Sao Paulo, Brazil.
Insights
Primary graft dysfunction (PGD) in heart transplantation involves distinct gene expression profiles. MYL4 gene expression was lower, while B3GALT5 was higher in PGD patients, offering potential biomarkers for this condition.
Area of Science:
- Cardiology
- Transplantation Immunology
- Genomics
Background:
- Primary graft dysfunction (PGD) is the leading cause of early mortality after cardiac transplantation.
- Ischemia/reperfusion injury is a key factor in PGD pathogenesis, exacerbated by donor heart stresses.
- Understanding PGD pathophysiology is crucial for improving graft survival.
Purpose of the Study:
- To evaluate gene expression profiles in heart transplant patients with PGD.
- To compare transcriptomic data between PGD and non-PGD groups.
- To identify potential gene expression biomarkers for PGD.
Main Methods:
- Transcriptomic analysis of myocardial biopsies from adult heart transplant recipients.
- Inclusion of 20 consecutive patients diagnosed with PGD based on established criteria.
- Evaluation of clinical and laboratory data from donors and recipients.
Main Results:
- Significant differences in gene expression were observed between PGD and non-PGD patients.
- MYL4 gene expression was significantly lower in patients with PGD.
- B3GALT5 gene expression was significantly higher in patients with PGD, linked to inflammatory response.
Conclusions:
- Gene expression profiles differ significantly in heart transplant recipients with PGD.
- MYL4 and B3GALT5 represent potential molecular markers for PGD.
- Further research into gene expression may elucidate PGD pathophysiology and identify diagnostic biomarkers.
Background:
Cardiac transplantation remains the primary treatment for advanced heart failure, with primary graft dysfunction (PGD) being the leading cause of early mortality. While PGD's exact pathogenesis is unclear, ischemia/reperfusion injury is a key factor. Donor hearts undergo multiple stresses, such as brain death, hypothermia, and ischemia, contributing to PGD and reduced graft survival. Many centers are studying PGD's pathophysiology through epidemiological, biomarker, and transcriptome analyses. This study aims to evaluate, via transcriptomic analysis of myocardial biopsies, the gene expression profile of patients with PGD and compare it with those without PGD.
Methods:
Adult heart transplant patients were included in the study after signing the Informed Consent. The diagnosis of PGD followed the International Society for Heart and Lung Transplant criteria. Clinical and laboratory data from donors and recipients were evaluated. We included 20 consecutive heart transplant patients in the protocol. Gene expression analysis was performed via biopsies at donor heart implantation.
Results:
Eleven genes had their expression significantly different in patients with PGD, with MYL4 the less expressed gene, and related to the myosin function and the gene B3GALT 5 the most expressed one and associated with the inflammatory response.
Conclusions:
The gene expression in patients with PGD is different when compared to patients without PGD. MYL4 gene was much less expressed in these patients and B3GALT5 was overexpressed. Future studies regarding gene expression on PGD may clarify the pathophysiology and provide possible biomarkers of the disease.
