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Series GSE76575 Query DataSets for GSE76575
Status Public on Jan 07, 2016
Title The role of mRNA decay in p53-induced gene expression
Organism Homo sapiens
Experiment type Expression profiling by array
Summary The p53 tumor suppressor is a DNA damage responsive sequence-specific transcriptional activator. The sustained activation of the p53 response is incompatible with cell growth and viability. To circumvent this issue, a variety of negative feedback loops exist to limit the duration of p53 activation. Despite our understanding of p53-regulation, very little is known about the effect of transient p53 activation on the long term expression of p53 target genes. Here we used a temperature sensitive variant of p53 and oligonucleotide microarrays to monitor gene expression during and following reversible p53 activation. The expression of most p53-induced transcripts was rapidly reversible, consistent with active mRNA decay. Representative 3’UTRs derived from short-lived transcripts (i.e. DDB2 and GDF15) conferred instability on a heterologous mRNA while 3’UTRs derived from more stable transcripts (i.e. CRYAB and TP53I3) did not. The 3’UTRs derived from unstable p53-induced mRNAs were significantly longer than those derived from stable mRNAs. These 3’UTRs had high uridine and low cytosine content, leading to a higher density of U-, AU- and GU-rich sequences. Remarkably, short-lived p53 targets were induced faster reaching maximum transcript levels earlier than the stable p53-targets. Taken together, the p53 transcriptional response has evolved with primarily short-lived target mRNAs and that post-transcription processes play a prominent role in the p53 response.
Overall design HT29-tsp53 cells expressing a temperature sensitive variant of p53 were used to study the reversal of the p53 response. Gene expression was assessed using Affymetrix Gene 1.0 ST oligonucleotide microarrays. Controls were maintained at the restrictive temperature (time 0) and treatments were collected following 16 hours at the permissie temperature (16 hours) and following a subsequent 6 hour recovery period (16 hours at 32 + 6 hour at 37).
Contributor(s) Melanson BD, Bose R, Hamill JD, Marcellus KA, Pan EF, McKay BC
Citation(s) 22020975
Submission date Jan 06, 2016
Last update date Jan 25, 2019
Contact name Bruce McKay
Phone 6135202600
Organization name Carleton University
Department Biology
Street address 1125 Colonel By Dr.
City Ottawa
State/province Ontario
ZIP/Postal code K1S 5B6
Country Canada
Platforms (1)
GPL10739 [HuGene-1_0-st] Affymetrix Human Gene 1.0 ST Array [probe set (exon) version]
Samples (6)
GSM2028142 HT29tsp53-p53 off- 1
GSM2028143 HT29tsp53-p53 on- 1
GSM2028144 HT29tsp53-p53 on then off- 1
BioProject PRJNA308079

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