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SOX17 initiates an immune evasion program in early colorectal cancers.

ABSTRACT: SOX17 initiates an immune evasion program in early colorectal cancers.

PROVIDER: PRJNA923238 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR23060900_1.fastq.gz	Fastqsanger.gz
	SRR23060900_2.fastq.gz	Fastqsanger.gz
	SRR23060901_1.fastq.gz	Fastqsanger.gz
	SRR23060901_2.fastq.gz	Fastqsanger.gz
	SRR23060902_1.fastq.gz	Fastqsanger.gz

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Project description:In addition to accumulation of step-wise genetic mutations, epigenetic alterations play critical roles in the evolution of colon cancers. However, distinct mutational patterns and patient backgrounds render it challenging to distinguish driver epigenetic alterations from passenger epigenetic alterations. To address this, we combined the colon cancer organoid orthotopic transplantation approach with comprehensive epigenomic and transcriptomic analyses. We found that an in vivo environment induces epigenetic alterations with fetal intestinal features that converge on SOX17, a transcription factor that is required for endoderm development. Surprisingly, SOX17 knockout leads to tumour rejection in immunocompetent mice, but not in immunodeficient mice, by turning immune cold tumours into hot with robust infiltration of activated CD8+ T cells. Mechanistically, SOX17 suppresses Ifngr1-mediated MHC-I expression to evade CD8+ T cell-mediated tumour cell killing. At the tumour initiation, SOX17 expression is induced by APC loss, and SOX17 facilitates the production of LGR5- cells with low MHC-I expression to evade immune surveillance. Together, our result reveals that SOX17 is a master transcriptional factor that induces in vivo epigenetic reprograming of tumours, which provides fundamental understanding of how an immune evasion program is initiated at the early stages of colon cancer development.

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