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RNA-seq Analysis in 4T07 Control (4T07-CTL) and Six2 Overexpression (4T07-Six2) cells

ABSTRACT: To determine the molecular mechanisms by which Six2 regulates metastatic colonization, we performed RNA-seq analysis on murine triple-negative 4T07 Control (4T07-CTL) and Six2 overexpressing (4T07-Six2) cells. Using both targeted and unbiased gene signature analyses, we found that Six2 differentially regulates gene signatures associated with stemness. Additionally, we confirmed that in several triple-negative breast cancer (TNBC) models, Six2 enhanced the expression of genes (identified as among the highest upregulated genes in response to Six2 overexpression) associated with embryonic stem cell programs. When combined with our in vitro and in vivo stemness-associated phenotypic assays, these data suggest that Six2 may play a similar role in mediating stemness characteristics during tumor progression as it does during development, and that this role may allow it to mediate late-stage metastasis by enhancing the ability of cells to self-renew and survive at secondary sites.

ORGANISM(S): Mus musculus

PROVIDER: GSE123489 | GEO | 2020/01/30

REPOSITORIES: GEO

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RNA-seq Analysis in 4T07 Control (4T07-CTL) and Six2 Overexpression (4T07-Six2) cells

Project description:RNA-seq Analysis in 4T07 Control (4T07-CTL) and Six2 Overexpression (4T07-Six2) cells

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Exploring Six2 distal enhancer interactome in developing mouse kidney

Project description:The Six2 distal enhancer regulates expression of the 60 kb-downstream gene Six2, but does not regulate the Six3 gene which is 70 kb further downstream. CTCF ChIP-Seq and Hi-C data points to a chromatin domain boundary between Six2 and Six3 which may intervene interaction between Six2-DE and Six3. The irradiation-induced Brachyrrhine (Br) mutant allele was found to carry a 320 kb genomic inversion that includes Six2 and Six3, but not Six2DE. This repositioned Six2 under Six3 enhancer control and Six3 under Six2 distal enhancer control. Consistent with this, Six3 is ectopically expressed in Br/+ kidneys and Six2 expression is reduced. To test whether there is a change of interaction between Six2 distal enhancer and Six2 or Six3 promoters, we performed 4C-Seq in E16.5 wildtyp or Br/+ mice nephron-genic zone cells.

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