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2017 ; 20
(ä): 109-119
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The Transcriptional Landscape of p53 Signalling Pathway
#MMPMID28558959
Tanikawa C
; Zhang YZ
; Yamamoto R
; Tsuda Y
; Tanaka M
; Funauchi Y
; Mori J
; Imoto S
; Yamaguchi R
; Nakamura Y
; Miyano S
; Nakagawa H
; Matsuda K
EBioMedicine
2017[Jun]; 20
(ä): 109-119
PMID28558959
show ga
Although recent cancer genomics studies have identified a large number of genes
that were mutated in human cancers, p53 remains as the most frequently mutated
gene. To further elucidate the p53-signalling network, we performed transcriptome
analysis on 24 tissues in p53(+/+) or p53(-/-) mice after whole-body X-ray
irradiation. Here we found transactivation of a total of 3551 genes in one or
more of the 24 tissues only in p53(+/+) mice, while 2576 genes were
downregulated. p53 mRNA expression level in each tissue was significantly
associated with the number of genes upregulated by irradiation. Annotation using
TCGA (The Cancer Genome Atlas) database revealed that p53 negatively regulated
mRNA expression of several cancer therapeutic targets or pathways such as BTK,
SYK, and CTLA4 in breast cancer tissues. In addition, stomach exhibited the
induction of Krt6, Krt16, and Krt17 as well as loricrin, an epidermal
differentiation marker, after the X-ray irradiation only in p53(+/+) mice,
implying a mechanism to protect damaged tissues by rapid induction of
differentiation. Our comprehensive transcriptome analysis elucidated tissue
specific roles of p53 and its signalling networks in DNA-damage response that
will enhance our understanding of cancer biology.