In vitro downregulated hypoxia transcriptome is associated with poor prognosis in breast cancer

Molecular Cancer

Research

Francesca M. Buffa¹  Adrian L. Harris¹  Basel Abu-Jamous²  Asoke K. Nandi³ 

[1]Cancer Research UK, Department of Oncology, Weatherall Institute of Molecular Medicine, OX3 9DS, Oxford, UK

[2]Department of Electronic and Computer Engineering, Brunel University London, Uxbridge, UB8 3PH, Middlesex, UK

[3]Department of Plant Sciences, University of Oxford, OX1 3RB, Oxford, UK

[4]Department of Electronic and Computer Engineering, Brunel University London, Uxbridge, UB8 3PH, Middlesex, UK

[5]The Key Laboratory of Embedded Systems and Service Computing, College of Electronic and Information Engineering, Tongji University, Peoples, Shanghai, Republic of China

关键词: Breast cancer;    Cell lines;    Hypoxia;    Co-expression;    Co-regulation;    Genome-wide analysis;    Clustering;    Bioinformatics;    UNCLES;   

DOI  :  10.1186/s12943-017-0673-0

 received in 2016-11-18, accepted in 2017-06-02,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundHypoxia is a characteristic of breast tumours indicating poor prognosis. Based on the assumption that those genes which are up-regulated under hypoxia in cell-lines are expected to be predictors of poor prognosis in clinical data, many signatures of poor prognosis were identified. However, it was observed that cell line data do not always concur with clinical data, and therefore conclusions from cell line analysis should be considered with caution. As many transcriptomic cell-line datasets from hypoxia related contexts are available, integrative approaches which investigate these datasets collectively, while not ignoring clinical data, are required.ResultsWe analyse sixteen heterogeneous breast cancer cell-line transcriptomic datasets in hypoxia-related conditions collectively by employing the unique capabilities of the method, UNCLES, which integrates clustering results from multiple datasets and can address questions that cannot be answered by existing methods. This has been demonstrated by comparison with the state-of-the-art iCluster method. From this collection of genome-wide datasets include 15,588 genes, UNCLES identified a relatively high number of genes (>1000 overall) which are consistently co-regulated over all of the datasets, and some of which are still poorly understood and represent new potential HIF targets, such as RSBN1 and KIAA0195. Two main, anti-correlated, clusters were identified; the first is enriched with MYC targets participating in growth and proliferation, while the other is enriched with HIF targets directly participating in the hypoxia response. Surprisingly, in six clinical datasets, some sub-clusters of growth genes are found consistently positively correlated with hypoxia response genes, unlike the observation in cell lines. Moreover, the ability to predict bad prognosis by a combined signature of one sub-cluster of growth genes and one sub-cluster of hypoxia-induced genes appears to be comparable and perhaps greater than that of known hypoxia signatures.ConclusionsWe present a clustering approach suitable to integrate data from diverse experimental set-ups. Its application to breast cancer cell line datasets reveals new hypoxia-regulated signatures of genes which behave differently when in vitro (cell-line) data is compared with in vivo (clinical) data, and are of a prognostic value comparable or exceeding the state-of-the-art hypoxia signatures.

【 授权许可】

CC BY   
© The Author(s). 2017