通过基于网络的方法在种族多样化的结肠类器官干细胞队列中评估结直肠癌风险因素
Assessment of Colorectal Cancer Risk Factors through the Application of Network-Based Approaches in a Racially Diverse Cohort of Colon Organoid Stem Cells.
作者信息
Devall Matthew, Eaton Stephen, Yoshida Cynthia, Powell Steven M, Casey Graham, Li Li
机构信息
Department of Family Medicine, University of Virginia, Charlottesville, VA 22903, USA.
Digestive Health Center, University of Virginia, Charlottesville, VA 22903, USA.
出版信息
Cancers (Basel). 2023 Jul 9;15(14):3550. doi: 10.3390/cancers15143550.
Numerous demographic factors have been associated with colorectal cancer (CRC) risk. To better define biological mechanisms underlying these associations, we performed RNA sequencing of stem-cell-enriched organoids derived from the healthy colons of seven European Americans and eight African Americans. A weighted gene co-expression network analysis was performed following RNA sequencing. Module-trait relationships were determined through the association testing of each module and five CRC risk factors (age, body mass index, sex, smoking history, and race). Only modules that displayed a significantly positive correlation for gene significance and module membership were considered for further investigation. In total, 16 modules were associated with known CRC risk factors ( < 0.05). To contextualize the role of risk modules in CRC, publicly available RNA-sequencing data from TCGA-COAD were downloaded and re-analyzed. Differentially expressed genes identified between tumors and matched normal-adjacent tissue were overlaid across each module. Loci derived from CRC genome-wide association studies were additionally overlaid across modules to identify robust putative targets of risk. Among them, and represented strong plausible drivers through which cigarette smoking and BMI potentially modulated CRC risk, respectively. In summary, our findings highlight the potential of the colon organoid system in identifying novel CRC risk mechanisms in an ancestrally diverse and cellularly relevant population.
许多人口统计学因素都与结直肠癌(CRC)风险相关。为了更好地确定这些关联背后的生物学机制,我们对来自7名欧洲裔美国人和8名非洲裔美国人健康结肠的富含干细胞的类器官进行了RNA测序。RNA测序后进行了加权基因共表达网络分析。通过对每个模块与五个CRC风险因素(年龄、体重指数、性别、吸烟史和种族)的关联测试来确定模块-性状关系。仅考虑那些在基因显著性和模块成员关系上显示出显著正相关的模块进行进一步研究。总共16个模块与已知的CRC风险因素相关(<0.05)。为了阐明风险模块在CRC中的作用,下载并重新分析了来自TCGA-COAD的公开可用RNA测序数据。在肿瘤与匹配的正常相邻组织之间鉴定出的差异表达基因被叠加到每个模块上。来自CRC全基因组关联研究的基因座也被叠加到模块上,以确定可靠的潜在风险靶点。其中,[具体基因1]和[具体基因2]分别代表了吸烟和BMI可能调节CRC风险的强有力的合理驱动因素。总之,我们的研究结果突出了结肠类器官系统在确定一个具有祖先多样性且与细胞相关的人群中新型CRC风险机制方面的潜力。