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Anaplastic Transformation Model in Thyroid Cancer Revealed by Single Cell Lineage and Fate Analysis

ABSTRACT: Anaplastic Transformation Model in Thyroid Cancer Revealed by Single Cell Lineage and Fate Analysis

PROVIDER: PRJNA796654 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR17593555.fastq.gz	Fastqsanger.gz
	SRR17593576.fastq.gz	Fastqsanger.gz
	SRR18662579_1.fastq.gz	Fastqsanger.gz
	SRR18662579_2.fastq.gz	Fastqsanger.gz

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Anaplastic Transformation Model in Thyroid Cancer Revealed by Single Cell Lineage and Fate Analysis

Project description:The deadliest anaplastic thyroid cancer (ATC) often transforms from indolent differentiated thyroid cancer (DTC), however the complex intra-tumor transformation process is poorly understood. We investigated an anaplastic transformation model by dissecting both cell lineage and cell fate transitions using single cell transcriptomes and genetic alterations data of patients with different subtypes of thyroid cancer. The resulting model started from stress-responsive DTC cells to inflammatory ATC cells, to mitotic defective ATC cells and extended all the way to mesenchymal ATC cells. In parallel with tumor cell evolution, macrophages shifted from anti-tumor to tumor-promoting states and T cells reprogrammed from cytotoxic to exhausted states. Further, our analysis identified two important milestones: 1) diploid stage, where ATC cells were commonly diploids with non-RAS mutations and inflammatory phenotypes. 2) aneuploid stage, where ATC cells gained aneuploidy with frequent RAS mutations and mesenchymal phenotypes leading to the extreme lethal stage of ATC progression.

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PIAS2b dsRNAi repression kills by mitotic catastrophe anaplastic thyroid and non-thyroid carcinomas, but not normal thyroid or differentiated carcinomas

Project description:The E3 SUMO ligase PIAS2 is expressed at high levels in differentiated papillary thyroid carcinomas but at low levels in anaplastic thyroid carcinomas (ATC), an undifferentiated cancer with very high mortality. Double-stranded RNA–directed RNA interference (dsRNAi) targeting the PIAS2 isoform beta (PIAS2b) inhibits growth of ATC cell lines and patient primary cultures in vitro and orthotopic patient-derived xenografts (oPDX) in vivo, but not of thyroid cell lines or non-anaplastic primary thyroid cultures (differentiated carcinoma, benign lesions, or normal). PIAS2b-dsRNAi also has an anti-cancer effect on other anaplastic human cancers (pancreas, lung, and gastric). Mechanistically, PIAS2b is required for proper mitotic spindle and centrosome assembly, and it is a dosage-sensitive protein in ATC. Strikingly, PIAS2b-dsRNAi induces mitotic catastrophe at prophase. High-throughput proteomics revealed the proteasome (PSMC5) and spindle cytoskeleton as direct targets of PIAS2b SUMOylation at mitotic initiation. PIAS2b-dsRNAi is a promising therapy for ATC and other aggressive anaplastic cancers.

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Project description:We profiled the gene expression of 11 anaplastic thyroid carcinomas (ATC), 49 papillary thyroid carcinomas (PTC) and 45 normal thyroids (N) We hibridized a series of anaplastic thyroid carcinomas (ATC) and papillary thyroid carcinomas (PTC) onto Affymetrix U133 Plus 2.0 arrays. ATCs were obtained from different hospitals in France and Belgium. Paired RNA samples of PTCs and non-tumoral thyroid tissues were obtained from Ukraine via the Chernobyl Tissue Bank (www.chernobyltissuebank.com). Diagnoses were confirmed by the members of the International Pathology Panel of the Chernobyl Tissue Bank.

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