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2017 ; 8
(1
): 1315
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Mutational signatures reveal the dynamic interplay of risk factors and cellular
processes during liver tumorigenesis
#MMPMID29101368
Letouzé E
; Shinde J
; Renault V
; Couchy G
; Blanc JF
; Tubacher E
; Bayard Q
; Bacq D
; Meyer V
; Semhoun J
; Bioulac-Sage P
; Prévôt S
; Azoulay D
; Paradis V
; Imbeaud S
; Deleuze JF
; Zucman-Rossi J
Nat Commun
2017[Nov]; 8
(1
): 1315
PMID29101368
show ga
Genomic alterations driving tumorigenesis result from the interaction of
environmental exposures and endogenous cellular processes. With a diversity of
risk factors, liver cancer is an ideal model to study these interactions. Here,
we analyze the whole genomes of 44 new and 264 published liver cancers and we
identify 10 mutational and 6 structural rearrangement signatures showing distinct
relationships with environmental exposures, replication, transcription, and
driver genes. The liver cancer-specific signature 16, associated with alcohol,
displays a unique feature of transcription-coupled damage and is the main source
of CTNNB1 mutations. Flood of insertions/deletions (indels) are identified in
very highly expressed hepato-specific genes, likely resulting from
replication-transcription collisions. Reconstruction of sub-clonal architecture
reveals mutational signature evolution during tumor development exemplified by
the vanishing of aflatoxin B1 signature in African migrants. Finally, chromosome
duplications occur late and may represent rate-limiting events in tumorigenesis.
These findings shed new light on the natural history of liver cancers.