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A time course study demonstrating RNA stability in postmortem skin.

Neera V Gopee1, Paul C Howard

  • 1Division of Biochemical Toxicology, and National Toxicology Program Center for Phototoxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Department of Health and Human Services, Jefferson, Arkansas 72079, USA.

Experimental and Molecular Pathology
|December 19, 2006
PubMed
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RNA integrity in mouse skin remains stable for up to 60 minutes postmortem. This finding is crucial for reliable gene expression studies using dermal tissue, ensuring accurate results in research.

Area of Science:

  • Molecular Biology
  • Dermatology
  • Genomics

Background:

  • Understanding mRNA degradation factors, including postmortem interval, is vital for accurate gene expression analysis in dermal tissue.
  • RNA stability is known to be tissue-specific, necessitating an evaluation of its preservation in cutaneous samples over time.

Purpose of the Study:

  • To assess the impact of postmortem interval on the integrity of total RNA and specific mRNA levels in murine skin.
  • To determine the reliability of gene expression data from dermal tissue collected within 60 minutes after sacrifice.

Main Methods:

  • Excised fresh skin tissue from SKH-1 female hairless mice at 0-60 minute intervals post-sacrifice.
  • Evaluated total RNA integrity using Bioanalyzer profiles (28S/18S rRNA ratio, RNA integrity number).

Related Experiment Videos

  • Quantified mRNA expression levels of five selected genes (Ccnd1, Hif1alpha, cMyc, Cyr61) via real-time quantitative PCR.

    • Main Results:

    • No significant changes were observed in the 28S/18S rRNA ratio or RNA integrity number up to 60 minutes postmortem.
    • Relative gene expression levels of Ccnd1, Hif1alpha, cMyc, and Cyr61 showed no statistical differences as a function of postmortem interval.
    • Cutaneous tissue molecular quality is well-preserved for at least 60 minutes after death.

    Conclusions:

    • Murine dermal tissue maintains high RNA quality for up to 60 minutes postmortem.
    • This preservation supports the reliability of gene expression studies using skin samples collected within this timeframe.
    • Findings are important for optimizing tissue procurement protocols in in vivo and ex vivo dermal research.