Postmortem mRNA expression patterns in left ventricular myocardial tissues and their implications for forensic...

Area of Science:

• Forensic Pathology
• Molecular Biology
• Cardiology

Background:

• Sudden cardiac death (SCD) is a leading cause of mortality in developed nations, often stemming from heart disorders.
• Diagnosing SCD postmortem can be challenging due to limited histological evidence.
• Myocardial ischemia, primarily from coronary artery disease, is a common cause of SCD.

Purpose of the Study:

• To identify distinct postmortem mRNA expression patterns in the heart for diagnosing SCD.
• To evaluate specific mRNA markers, including hemoglobin and pyruvate dehydrogenase kinase 4, for their utility in forensic investigations of cardiac death.

Main Methods:

• Analysis of postmortem mRNA expression levels of Hba1/2, Hbb, and Pdk4 in the left ventricular free wall.
• Comparison of mRNA expression between sudden cardiac death subjects and controls with non-cardiac causes of death.
• Correlation of mRNA expression with cardiac pathology, including acute myocardial infarction and ischemic heart disease.

Main Results:

• Hemoglobin A1/2 and B (Hba1/2, Hbb) mRNA levels were elevated in SCD cases compared to controls.
• Pyruvate dehydrogenase kinase 4 (Pdk4) mRNA levels were decreased in SCD subjects.
• These distinct mRNA expression patterns were observed even in cases without apparent pathological signs of heart injury.

Conclusions:

• Altered myocardial Hba1/2, Hbb, and Pdk4 mRNA expression patterns can serve as molecular signatures for fatal cardiac dysfunction.
• These molecular signatures can aid in forensically implicating SCD as the primary cause of death.
• The findings offer a novel approach to improve postmortem diagnosis in cases of suspected sudden cardiac death.