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Title : Gene Expression After Death
link : Gene Expression After Death

Gene Expression After Death

Make of this what you will; apparently, in mice and zebrafish, over one thousand genes show increased expression after the death of the animal, with altered expression extending up tp 96 hours postmortem.  The following gene categories were emphasized: “stress, immunity, inflammation, apoptosis, transport, development, epigenetic regulation and cancer.”  Abstract:

In life, genetic and epigenetic networks precisely coordinate the expression of genes—but in death, it is not known if gene expression diminishes gradually or abruptly stops or if specific genes and pathways are involved. We studied this by identifying mRNA transcripts that apparently increase in relative abundance after death, assessing their functions, and comparing their abundance profiles through postmortem time in two species, mouse and zebrafish. We found mRNA transcript profiles of 1063 genes became significantly more abundant after death of healthy adult animals in a time series spanning up to 96 h postmortem. Ordination plots revealed non-random patterns in the profiles by time. While most of these transcript levels increased within 0.5 h postmortem, some increased only at 24 and 48 h postmortem. Functional characterization of the most abundant transcripts revealed the following categories: stress, immunity, inflammation, apoptosis, transport, development, epigenetic regulation and cancer. The data suggest a step-wise shutdown occurs in organismal death that is manifested by the apparent increase of certain transcripts with various abundance maxima and durations.

Thus Article Gene Expression After Death

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