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2016 ; 7
(9
): 10182-92
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Chromothripsis-like chromosomal rearrangements induced by ionizing radiation
using proton microbeam irradiation system
#MMPMID26862731
Morishita M
; Muramatsu T
; Suto Y
; Hirai M
; Konishi T
; Hayashi S
; Shigemizu D
; Tsunoda T
; Moriyama K
; Inazawa J
Oncotarget
2016[Mar]; 7
(9
): 10182-92
PMID26862731
show ga
Chromothripsis is the massive but highly localized chromosomal rearrangement in
response to a one-step catastrophic event, rather than an accumulation of a
series of subsequent and random alterations. Chromothripsis occurs commonly in
various human cancers and is thought to be associated with increased malignancy
and carcinogenesis. However, the causes and consequences of chromothripsis remain
unclear. Therefore, to identify the mechanism underlying the generation of
chromothripsis, we investigated whether chromothripsis could be artificially
induced by ionizing radiation. We first elicited DNA double-strand breaks in an
oral squamous cell carcinoma cell line HOC313-P and its highly metastatic subline
HOC313-LM, using Single Particle Irradiation system to Cell (SPICE), a focused
vertical microbeam system designed to irradiate a spot within the nuclei of
adhesive cells, and then established irradiated monoclonal sublines from them,
respectively. SNP array analysis detected a number of chromosomal copy number
alterations (CNAs) in these sublines, and one HOC313-LM-derived monoclonal
subline irradiated with 200 protons by the microbeam displayed multiple CNAs
involved locally in chromosome 7. Multi-color FISH showed a complex translocation
of chromosome 7 involving chromosomes 11 and 12. Furthermore, whole genome
sequencing analysis revealed multiple de novo complex chromosomal rearrangements
localized in chromosomes 2, 5, 7, and 20, resembling chromothripsis. These
findings suggested that localized ionizing irradiation within the nucleus may
induce chromothripsis-like complex chromosomal alterations via local DNA damage
in the nucleus.