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2015 ; 5
(ä): 18454
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TALENs-mediated gene disruption of FLT3 in leukemia cells: Using genome-editing
approach for exploring the molecular basis of gene abnormality
#MMPMID26669855
Wang J
; Li T
; Zhou M
; Hu Z
; Zhou X
; Zhou S
; Wang N
; Huang L
; Zhao L
; Cao Y
; Xiao M
; Ma D
; Zhou P
; Shang Z
; Zhou J
Sci Rep
2015[Dec]; 5
(ä): 18454
PMID26669855
show ga
Novel analytic tools are needed to elucidate the molecular basis of
leukemia-relevant gene mutations in the post-genome era. We generated isogenic
leukemia cell clones in which the FLT3 gene was disrupted in a single allele
using TALENs. Isogenic clones with mono-allelic disrupted FLT3 were compared to
an isogenic wild-type control clone and parental leukemia cells for
transcriptional expression, downstream FLT3 signaling and proliferation capacity.
The global gene expression profiles of mutant K562 clones and corresponding
wild-type controls were compared using RNA-seq. The transcriptional levels and
the ligand-dependent autophosphorylation of FLT3 were decreased in the mutant
clones. TALENs-mediated FLT3 haplo-insufficiency impaired cell proliferation and
colony formation in vitro. These inhibitory effects were maintained in vivo,
improving the survival of NOD/SCID mice transplanted with mutant K562 clones.
Cluster analysis revealed that the gene expression pattern of isogenic clones was
determined by the FLT3 mutant status rather than the deviation among individual
isogenic clones. Differentially expressed genes between the mutant and wild-type
clones revealed an activation of nonsense-mediated decay pathway in mutant K562
clones as well as an inhibited FLT3 signaling. Our data support that this
genome-editing approach is a robust and generally applicable platform to explore
the molecular bases of gene mutations.