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Postmortem interval determination using 18S-rRNA and microRNA.

Wen-Can Li1, Kai-Jun Ma2, Ye-Hui Lv3

  • 1Forensic Department, Shanghai Medical College, Fudan University, Shanghai 200032, China; Shanghai City Public Security Bureau, Shanghai 200032, China.

Science & Justice : Journal of the Forensic Science Society
|July 9, 2014
PubMed
Summary
This summary is machine-generated.

Determining the time of death is vital in forensic science. This study shows that analyzing ribosomal RNA (rRNA) and microRNA degradation in heart tissue can accurately estimate the postmortem interval (PMI) within seven days.

Keywords:
18S-rRNAPostmortem interval (PMI)Reverse transcription real-time quantitative polymerase chain reaction (RT-qPCR)microRNA

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Biochemistry

Background:

  • Accurate postmortem interval (PMI) estimation is critical for legal and forensic investigations.
  • Current methods for PMI determination have limitations.
  • RNA degradation patterns offer a potential biomarker for PMI.

Purpose of the Study:

  • To investigate the utility of 18S ribosomal RNA (rRNA) and microRNA levels for estimating PMI.
  • To develop and validate an RNA-based protocol for PMI determination.

Main Methods:

  • Heart tissues from rats were collected at various postmortem intervals.
  • A protocol involving total RNA extraction, transcription, and quantitative real-time PCR was employed.
  • Levels of 18S rRNA and microRNA were analyzed.

Main Results:

  • A distinct parabolic relationship was observed between the postmortem period and Ct values for 18S rRNA in rat heart tissue.
  • Degradation patterns of 18S rRNA and microRNA showed utility in PMI estimation.

Conclusions:

  • The degradation patterns of 18S rRNA and microRNA in postmortem heart tissue are reliable indicators for PMI determination.
  • This RNA-based method can estimate PMI within the first seven days postmortem.