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2016 ; 7
(39
): 62814-62835
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Acquisition of an oncogenic fusion protein serves as an initial driving mutation
by inducing aneuploidy and overriding proliferative defects
#MMPMID27588498
Loupe JM
; Miller PJ
; Bonner BP
; Maggi EC
; Vijayaraghavan J
; Zabaleta J
; Taylor CM
; Tsien F
; Crabtree JS
; Hollenbach AD
Oncotarget
2016[Sep]; 7
(39
): 62814-62835
PMID27588498
show ga
While many solid tumors are defined by the presence of a particular oncogene, the
role that this oncogene plays in driving transformation through the acquisition
of aneuploidy and overcoming growth arrest are often not known. Further, although
aneuploidy is present in many solid tumors, it is not clear whether it is the
cause or effect of malignant transformation. The childhood sarcoma, Alveolar
Rhabdomyosarcoma (ARMS), is primarily defined by the t(2;13)(q35;q14)
translocation, creating the PAX3-FOXO1 fusion protein. It is unclear what role
PAX3-FOXO1 plays in the initial stages of tumor development through the
acquisition and persistence of aneuploidy. In this study we demonstrate that
PAX3-FOXO1 serves as a driver mutation to initiate a cascade of mRNA and miRNA
changes that ultimately reprogram proliferating myoblasts to induce the formation
of ARMS. We present evidence that cells containing PAX3-FOXO1 have changes in the
expression of mRNA and miRNA essential for maintaining proper chromosome number
and structure thereby promoting aneuploidy. Further, we demonstrate that the
presence of PAX3-FOXO1 alters the expression of growth factor related mRNA and
miRNA, thereby overriding aneuploid-dependent growth arrest. Finally, we present
evidence that phosphorylation of PAX3-FOXO1 contributes to these changes. This is
one of the first studies describing how an oncogene and post-translational
modifications drive the development of a tumor through the acquisition and
persistence of aneuploidy. This mechanism has implications for other solid tumors
where large-scale genomics studies may elucidate how global alterations
contribute to tumor phenotypes allowing the development of much needed
multi-faceted tumor-specific therapeutic regimens.
|*Mutation
[MESH]
|Aneuploidy
[MESH]
|Animals
[MESH]
|Cell Cycle
[MESH]
|Cell Proliferation
[MESH]
|Cell Transformation, Neoplastic/genetics
[MESH]
|Chromosome Aberrations
[MESH]
|Disease Progression
[MESH]
|Forkhead Box Protein O1/genetics/*metabolism
[MESH]