Lebovitz Chandra B, Robertson A Gordon, Goya Rodrigo, Jones Steven J, Morin Ryan D, Marra Marco A, Gorski Sharon M
a The Genome Sciences Centre; BC Cancer Agency ; Vancouver, BC Canada.
b Department of Molecular Biology and Biochemistry ; Simon Fraser University ; Burnaby , BC Canada.
Autophagy. 2015;11(9):1668-87. doi: 10.1080/15548627.2015.1067362.
Aberrant activation or disruption of autophagy promotes tumorigenesis in various preclinical models of cancer, but whether the autophagy pathway is a target for recurrent molecular alteration in human cancer patient samples is unknown. To address this outstanding question, we surveyed 211 human autophagy-associated genes for tumor-related alterations to DNA sequence and RNA expression levels and examined their association with patient survival outcomes in multiple cancer types with sequence data from The Cancer Genome Atlas consortium. We found 3 (RB1CC1/FIP200, ULK4, WDR45/WIPI4) and one (ATG7) core autophagy genes to be under positive selection for somatic mutations in endometrial carcinoma and clear cell renal carcinoma, respectively, while 29 autophagy regulators and pathway interactors, including previously identified KEAP1, NFE2L2, and MTOR, were significantly mutated in 6 of the 11 cancer types examined. Gene expression analyses revealed that GABARAPL1 and MAP1LC3C/LC3C transcripts were less abundant in breast cancer and non-small cell lung cancers than in matched normal tissue controls; ATG4D transcripts were increased in lung squamous cell carcinoma, as were ATG16L2 transcripts in kidney cancer. Unsupervised clustering of autophagy-associated mRNA levels in tumors stratified patient overall survival in 3 of 9 cancer types (acute myeloid leukemia, clear cell renal carcinoma, and head and neck cancer). These analyses provide the first comprehensive resource of recurrently altered autophagy-associated genes in human tumors, and highlight cancer types and subtypes where perturbed autophagy may be relevant to patient overall survival.
在各种癌症临床前模型中,自噬的异常激活或破坏会促进肿瘤发生,但在人类癌症患者样本中,自噬途径是否是反复发生分子改变的靶点尚不清楚。为了解决这个突出问题,我们调查了211个人类自噬相关基因的DNA序列和RNA表达水平的肿瘤相关改变,并利用癌症基因组图谱联盟的序列数据,研究了它们与多种癌症类型患者生存结果的关联。我们发现3个(RB1CC1/FIP200、ULK4、WDR45/WIPI4)和1个(ATG7)核心自噬基因分别在子宫内膜癌和透明细胞肾细胞癌中受到体细胞突变的正选择,而29个自噬调节因子和途径相互作用分子,包括先前鉴定的KEAP1、NFE2L2和MTOR,在所检测的11种癌症类型中有6种发生了显著突变。基因表达分析显示,与匹配的正常组织对照相比,GABARAPL1和MAP1LC3C/LC3C转录本在乳腺癌和非小细胞肺癌中含量较低;ATG4D转录本在肺鳞状细胞癌中增加,ATG16L2转录本在肾癌中也增加。肿瘤中自噬相关mRNA水平的无监督聚类在9种癌症类型中的3种(急性髓系白血病、透明细胞肾细胞癌和头颈癌)中对患者总生存期进行了分层。这些分析提供了人类肿瘤中自噬相关基因反复改变的首个综合资源,并突出了自噬紊乱可能与患者总生存期相关的癌症类型和亚型。