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Single-cell transcriptomics reveal the dynamic of cancer stem-like cells during cholangiocarcinoma progression

ABSTRACT: Single-cell transcriptomics reveal the dynamic of cancer stem-like cells during cholangiocarcinoma progression

PROVIDER: PRJNA976926 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24753414.fastq.gz	Fastqsanger.gz
	SRR24753415.fastq.gz	Fastqsanger.gz
	SRR24753416.fastq.gz	Fastqsanger.gz
	SRR24753417.fastq.gz	Fastqsanger.gz
	SRR24753418.fastq.gz	Fastqsanger.gz

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Single-cell transcriptomics reveal the dynamic of cancer stem-like cells during cholangiocarcinoma progression

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Project description:Purpose: The aim of this study is to investigate mechanisms driving tumor-promoting mechanisms in cholangiocarcinoma while focusing on transitions from normal cholangiocytes to precancer lesions and from precancer lesion to invasive carcinoma. An original mouse model of intrahepatic cholangiocarcinoma was developed, based on induction of a KrasG12D mutation in cholangiocytes combined with chronic inflammation. RNA-Seq analyses compare the transcriptome of ductular proliferations, intraductal papillary neoplasm of the bile duct and intrahepatic cholangiocarcinoma. A gene cascade involving EGF, KrasG12D, Sox17 and Tns4 was identified to promote tumor progression.

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Project description:Validation of preclinical models of intrahepatic cholangiocarcinoma progression that reliably recapitulate altered molecular features of the human disease would provide an important resource for suggesting and testing of novel target-based therapies against this devastating cancer. In this study, comprehensive gene expression profiling in a novel orthotopic rat model of intrahepatic cholangiocarcinoma progression was carried out in an effort to identify potential therapeutic targets relevant to the progressive human cancer. Microarray analysis was performed on intrahepatic cholangiocarcinomas formed at 10, 15, and 25 days after bile duct inoculation of neu-transformed rat cholangiocytes (BDEneu cells) into rat liver and on peritoneal metastases at the 25 day time period, compared with non-cancerous right liver lobe from the same animals. Experiment Overall Design: Tumors were collected at 10, 15, 25 days post inoculation from biological triplicates (different rats innoculated simultaneously). Also, biological triplicates of metastatic tumors (Mets) at day 25 were analyzed. Biological triplicates of paired normal right liver lobe (RLL) from the same animals from which tumors/mets were obtained were also analyzed in this study. Thus, a total of 9 rats were used for this study.

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Project description:The cancer cells selectively promote translation of specific oncogenic transcripts to facilitate cancer survival and progression, while the underlying mechanisms are poorly understood. N7-methylguanosine (m7G) tRNA modification and its methyltransferase complex METTL1/WDR4 are significantly up-regulated in intrahepatic cholangiocarcinoma (ICC) and associated with poor prognosis. We developed tRNA reduction and cleavage sequencing (TRAC-Seq) to reveal the m7G tRNA methylome inICC cell line and ribosome nascent-chain complex-bound mRNAs sequencing(RNC-seq) and ribosome profiling(Ribo-seq) to study the differential translated genes and reveal the ribosome pausing. A subset of 22 tRNAs is modified at a ‘RAGGU’ motif within the variable loop. We observe increased ribosome occupancy at the corresponding codons in the Mettl1 knockdown ICC cell line implying widespread effects on tRNA function, ribosome pausing, and mRNA translation. Translation of cell cycle genes and EGFR signaling pathway genes is particularly affected. Our study uncovers the important physiological function and mechanism of METTL1-mediated m7G tRNA modification in the regulation of cancer progression.

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