Kim Jongbum, Kim Sangsoo
Department of Bioinformatics and Life Science, Soongsil University, Seoul 156-743, Korea.
Genomics Inform. 2014 Dec;12(4):171-80. doi: 10.5808/GI.2014.12.4.171. Epub 2014 Dec 31.
Aberrant DNA methylation, as an epigenetic marker of cancer, influences tumor development and progression. We downloaded publicly available DNA methylation and gene expression datasets of matched cancer and normal pairs from the Cancer Genome Atlas Data Portal and performed a systematic computational analysis. This study has three aims to screen genes that show hypermethylation and downregulated patterns in colorectal cancers, to identify differentially methylated regions in one of these genes, SFRP1, and to test whether the SFRP genes affect survival or not. Our results show that 31 hypermethylated genes had a negative correlation with gene expression. Among them, SFRP1 had a differentially methylated pattern at each methylation site. We also show that SFRP1 may be a potential biomarker for colorectal cancer survival.
异常DNA甲基化作为癌症的一种表观遗传标志物,影响肿瘤的发生和进展。我们从癌症基因组图谱数据门户下载了公开可用的匹配癌症与正常样本对的DNA甲基化和基因表达数据集,并进行了系统的计算分析。本研究有三个目标:筛选在结直肠癌中呈现高甲基化和下调模式的基因;鉴定其中一个基因SFRP1的差异甲基化区域;测试SFRP基因是否影响生存率。我们的结果表明,31个高甲基化基因与基因表达呈负相关。其中,SFRP1在每个甲基化位点都有差异甲基化模式。我们还表明,SFRP1可能是结直肠癌生存的一个潜在生物标志物。