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Meta-analysis of gene expression profiles indicates genes in spliceosome pathway are up-regulated in hepatocellular carcinoma (HCC)

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Abstract

Hepatocellular carcinoma (HCC) is among the commonest kind of malignant tumors, which accounts for more than 500,000 cases of newly diagnosed cancer annually. Many microarray studies for identifying differentially expressed genes (DEGs) in HCC have been conducted, but results have varied across different studies. Here, we performed a meta-analysis of publicly available microarray Gene Expression Omnibus datasets, which covers five independent studies, containing 753 HCC samples and 638 non-tumor liver samples. We identified 192 DEGs that were consistently up-regulated in HCC vs. normal liver tissue. For the 192 up-regulated genes, we performed Kyoto Encyclopedia of Genes and Genomes pathway analysis. To our surprise, besides several cell growth-related pathways, spliceosome pathway was also up-regulated in HCC. For further exploring the relationship between spliceosome pathway and HCC, we investigated the expression data of spliceosome pathway genes in 15 independent studies in Nextbio database (https://www.nextbio.com/b/nextbioCorp.nb). It was found that many genes of spliceosome pathway such as HSPA1A, SNRPE, SF3B2, SF3B4 and TRA2A genes which we identified to be up-regulated in our meta-analysis were generally overexpressed in HCC. At last, using real-time PCR, we also found that BUD31, SF3B2, SF3B4, SNRPE, SPINK1, TPA2A and HSPA1A genes are significantly up-regulated in clinical HCC samples when compared to the corresponding non-tumorous liver tissues. Our study for the first time indicates that many genes of spliceosome pathway are up-regulated in HCC. This finding might put new insights for people’s understanding about the relationship of spliceosome pathway and HCC.

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Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant No. 31071186, to Dr. Cao). Weijin Xu was supported by National Top Talent Undergraduate Training Program (NTTUTP).

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  1. State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, 220 Handan Road, Shanghai, 200433, People’s Republic of China

    Weijin Xu, Huixing Huang, Long Yu & Lihuan Cao

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  1. Weijin Xu
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  2. Huixing Huang
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  3. Long Yu
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Correspondence to Long Yu or Lihuan Cao.

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Weijin Xu and Huixing Huang have contributed equally to this work.

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Xu, W., Huang, H., Yu, L. et al. Meta-analysis of gene expression profiles indicates genes in spliceosome pathway are up-regulated in hepatocellular carcinoma (HCC). Med Oncol 32, 96 (2015). https://doi.org/10.1007/s12032-014-0425-6

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