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2015 ; 201
(3
): 885-95
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Dependence of Human Colorectal Cells Lacking the FBW7 Tumor Suppressor on the
Spindle Assembly Checkpoint
#MMPMID26354767
Bailey ML
; Singh T
; Mero P
; Moffat J
; Hieter P
Genetics
2015[Nov]; 201
(3
): 885-95
PMID26354767
show ga
FBW7 (F-box and WD repeat domain containing 7), also known as FBXW7 or hCDC4, is
a tumor suppressor gene mutated in a broad spectrum of cancer cell types. As a
component of the SCF E3 ubiquitin ligase, FBW7 is responsible for specifically
recognizing phosphorylated substrates, many important for tumor progression, and
targeting them for ubiquitin-mediated degradation. Although the role of FBW7 as a
tumor suppressor is well established, less well studied is how FBW7-mutated
cancer cells might be targeted for selective killing. To explore this further, we
undertook a genome-wide RNAi screen using WT and FBW7 knockout colorectal cell
lines and identified the spindle assembly checkpoint (SAC) protein BUBR1, as a
candidate synthetic lethal target. We show here that asynchronous FBW7 knockout
cells have increased levels of mitotic APC/C substrates and are sensitive to
knockdown of not just BUBR1 but BUB1 and MPS1, other known SAC components,
suggesting a dependence of these cells on the mitotic checkpoint. Consistent with
this dependence, knockdown of BUBR1 in cells lacking FBW7 results in significant
cell aneuploidy and increases in p53 levels. The FBW7 substrate cyclin E was
necessary for the genetic interaction with BUBR1. In contrast, the establishment
of this dependence on the SAC requires the deregulation of multiple substrates of
FBW7. Our work suggests that FBW7 knockout cells are vulnerable in their
dependence on the mitotic checkpoint and that this may be a good potential target
to exploit in FBW7-mutated cancer cells.