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2015 ; 47
(12
): 1402-7
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Clock-like mutational processes in human somatic cells
#MMPMID26551669
Alexandrov LB
; Jones PH
; Wedge DC
; Sale JE
; Campbell PJ
; Nik-Zainal S
; Stratton MR
Nat Genet
2015[Dec]; 47
(12
): 1402-7
PMID26551669
show ga
During the course of a lifetime, somatic cells acquire mutations. Different
mutational processes may contribute to the mutations accumulated in a cell, with
each imprinting a mutational signature on the cell's genome. Some processes
generate mutations throughout life at a constant rate in all individuals, and the
number of mutations in a cell attributable to these processes will be
proportional to the chronological age of the person. Using mutations from 10,250
cancer genomes across 36 cancer types, we investigated clock-like mutational
processes that have been operating in normal human cells. Two mutational
signatures show clock-like properties. Both exhibit different mutation rates in
different tissues. However, their mutation rates are not correlated, indicating
that the underlying processes are subject to different biological influences. For
one signature, the rate of cell division may influence its mutation rate. This
study provides the first survey of clock-like mutational processes operating in
human somatic cells.