Unknown,Transcriptomics,Genomics,Proteomics

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Transcriptomic analyses of Myc and xmrk induced zebrafish liver cancer

ABSTRACT: To compare the characteristics and mechanisms of Myc and xmrk induced zebrafish liver tumor, next generation sequencing-based SAGE analyses were used to examine the transcriptomes of tumor and control samples. The results indicated that relatively small overlaps of significantly deregulated genes and biological pathways among different zebrafish liver tumor models.Nevertheless, they all significantly correlate with advanced or very advanced human hepatocellular carcinoma (HCC). Molecular signature from each oncogene-induced zebrafish liver tumor correlated with only a small subset of human HCC samples, and they share conserved up-regulated pathways. A short list of commonly deregulated genes among different zebrafish liver tumors showed accordant deregulation in the majority of human HCCs, suggesting that they may serve as common diagnosis markers and therapeutic targets.Thus, these transgenic zebrafish models with well-defined oncogene-induced tumors are valuable tools for molecular classification of human HCCs and for understanding of molecular drivers in hepatocarcinogenesis in each human HCC subgroup. Transcriptome profiling of Myc tumor sample (X-M+D+) and control samples (X-M-D-, X-M+D-, X-M-D+), xmrk tumor sample (X+M-D+) and control samples (X-M-D-, X+M-D-, X-M-D+), were generated by deep sequencing, using 3' RNA-SAGE on SOLiD system

ORGANISM(S): Danio rerio

SUBMITTER: Weiling Zheng

PROVIDER: E-GEOD-53342 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Mouse models of hepatocellular carcinoma (HCC) simulate specific subgroups of human HCC. We investigated hepatocarcinogenesis in Mdr2-KO mice, a model of inflammation-associated HCC, using gene expression profiling and immunohistochemical analyses. Gene expression profiling demonstrated that although Mdr2-KO mice differ from other published murine HCC models, they share several important deregulated pathways and many coordinately differentially expressed genes with human HCC datasets. Analysis of genome positions of differentially expressed genes in liver tumors revealed a prolonged region of down-regulated genes on murine chromosome 8 in three of the six analyzed tumor samples. This region is syntenic to human chromosomal regions that are frequently deleted in human HCC and harbor multiple tumor suppressor genes. Real-time RT-PCR analysis of 16 tumor samples confirmed down-regulation of several tumor suppressors in most tumors. We demonstrate that in the aged Mdr2-KO mice, cyclin D1 nuclear level is increased in dysplastic hepatocytes that do not form nodules; however, it is decreased in dysplastic nodules and in liver tumors. We found that this decrease is mostly at the protein, rather than the mRNA level. These findings raise the question on the role of cyclin D1 at early stages of hepatocarcinogenesis in the Mdr2-KO HCC model. Furthermore, we show that most liver tumors in Mdr2-KO mice were characterized by the absence of b-catenin activation. In conclusion, the Mdr2-KO mouse may serve as a model for b-catenin-negative subgroup of human HCCs characterized by low nuclear cyclin D1 levels in tumor cells and by down-regulation of multiple tumor suppressor genes. Experiment Overall Design: The liver RNA samples from six Mdr2-KO tumors, six non-tumorous liver tissues (four matched and two unmatched), as well as from three control heterozygous mice at 16 months of age were subjected to gene expression profiling using the genome scale Affymetrix Mouse Genome 430 2.0 Array.

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Transcriptomic analyses of Myc and xmrk induced zebrafish liver cancer

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