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Differential gene expression and splicing in apc mutant zebrafish

ABSTRACT: Differential gene expression and splicing in apc mutant zebrafish

PROVIDER: PRJNA983838 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR24919833_1.fastq.gz	Fastqsanger.gz
	SRR24919833_2.fastq.gz	Fastqsanger.gz
	SRR24919834_1.fastq.gz	Fastqsanger.gz
	SRR24919834_2.fastq.gz	Fastqsanger.gz
	SRR24919835_1.fastq.gz	Fastqsanger.gz

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Differential gene expression and splicing in apc mutant zebrafish

Project description:APC is a classical tumor suppressor in humans, and truncating mutations are early somatic events in most cases of sporadic colon cancer. APC directly enhances the activity of glycogen synthase kinase 3 (GSK-3) and therefore loss of full length APC reduces GSK-3 activity, leading to stabilization of b-catenin protein and activation of downstream Wnt/b-catenin signaling. GSK-3 also phosphorylates multiple core mRNA splicing factors and loss of Gsk3a/b in mouse ES cells and human lymphocytes alters mRNA splicing at a genome wide level. We therefore predict that loss of APC should similarly alter splicing by reducing GSK-3 activity. Here we use RNA-seq to assess differential gene expression and altered splicing in apc-mcr mutant zebrafish embryos at 48hpf. We find robust activation of known Wnt/b-catenin target genes, as expected. Surprisingly, we also find markedly increased expression of multiple genes related to inflammation and cytokine signaling. We also identify 340 mRNA splicing variations in apc mutant zebrafish. Many of these local splice variants (LSVs) occur in mRNAs the regulate cell adhesion, migration, and morphogenesis.

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Phenotypic heterogeneity analysis of APC-mutant colon cancer by proteomics and phosphoproteomics identifies RAI14 as a key prognostic determinant

Project description:Adenomatous polyposis coli (APC) is an important tumor suppressor and most directly related to the regulation of WNT/β-catenin signaling pathway. APC mutation has been identified as an early event in more than 80% of sporadic colorectal cancers (CRCs). However, obvious prognostic differences are observed in CRC patients with APC mutations. Although previous genomics has investigated the roles of concomitant gene mutations in determining the phenotypic heterogeneity of APC-mutant tumors, valuable prognostic determinants for APC-mutant CRC patients are still lacking. By using combined proteome and phosphoproteome, we classified the APC-mutant colon cancer patients and revealed the genomic, proteomic and phosphoproteomic heterogeneity in APC-mutant tumors. Of importance, we identified RAI14 as a key prognostic determinant for APC-mutant colon cancer patients, but not for APC-wildtype colon cancer patients. The heterogeneity and prognostic biomarkers in APC-mutant tumors were further confirmed in Clinical Proteomic Tumor Analysis Consortium (CPTAC) colon cancer cohort. In addition, we found that knockdown of RAI14 in cell lines led to reduced cell migration and changes in some epithelial-mesenchymal transition (EMT)-related markers. Mechanistically, knockdown of RAI14 was able to remodel the phosphoproteome associated with cell adhesion, which might promote F-action degradation and alter the expression of certain EMT markers. Collectively, this work describes the phenotypic heterogeneity of APC-mutant tumors and identifies the prognostic determinants for APC-mutant colon cancer patients. The prognostic utility of RAI14 in APC-mutant colon cancer will provide early warning and increase the chance of successful treatment.

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