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结直肠癌转移中显著转录因子的基因组和调控特征。

Genomic and regulatory characteristics of significant transcription factors in colorectal cancer metastasis.

机构信息

School of Life Science, Tsinghua University, Beijing, 100084, China.

Department of Biochemistry and Molecular biology, Shanxi Medical University, Taiyuan, China.

出版信息

Sci Rep. 2018 Dec 13;8(1):17836. doi: 10.1038/s41598-018-36168-8.

Abstract

The dysregulation of transcription factors has an important impact on the oncogenesis and tumor progression. Nonetheless, its functions in colorectal cancer metastasis are still unclear. In this study, four transcription factors (HNF4A, HSF1, MECP2 and RAD21) were demonstrated to be associated with the metastasis of colorectal cancer in both RNA and protein levels. To comprehensively explore the intrinsic mechanisms, we profiled the molecular landscape of these metastasis-related transcription factors from multiple perspectives. In particular, as the crucial factors affecting genome stability, both copy number variation and DNA methylation exerted their strengths on the expression of these transcription factors (except MECP2). Additionally, based on a series of bioinformatics analyses, putative long non-coding RNAs were identified as functional regulators. Besides that, rely on the ATAC-Seq and ChIP-Seq profiles, we detected the target genes regulated by each transcription factor in the active chromatin zones. Finally, we inferred the associations between the target genes by Bayesian networks and identified LMO7 and ARL8A as potential clinical biomarkers. Taken together, our research systematically characterized the regulatory cascades of HNF4A, HSF1, MECP2 and RAD21 in colorectal cancer metastasis.

摘要

转录因子的失调对肿瘤的发生和肿瘤进展有重要影响。尽管如此,其在结直肠癌转移中的作用仍不清楚。在这项研究中,我们发现了四个转录因子(HNF4A、HSF1、MECP2 和 RAD21)在 RNA 和蛋白质水平上都与结直肠癌的转移有关。为了全面探索内在机制,我们从多个角度对这些与转移相关的转录因子的分子景观进行了分析。特别是,作为影响基因组稳定性的关键因素,拷贝数变异和 DNA 甲基化都对这些转录因子的表达产生了影响(除了 MECP2)。此外,基于一系列的生物信息学分析,我们确定了潜在的长非编码 RNA 作为功能调节剂。除此之外,我们还利用 ATAC-Seq 和 ChIP-Seq 图谱,检测了每个转录因子在活性染色质区域调控的靶基因。最后,我们通过贝叶斯网络推断了靶基因之间的关联,并确定了 LMO7 和 ARL8A 作为潜在的临床生物标志物。综上所述,我们的研究系统地描述了 HNF4A、HSF1、MECP2 和 RAD21 在结直肠癌转移中的调控级联。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/919d/6292939/aca27107745d/41598_2018_36168_Fig1_HTML.jpg

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