Gene set enrichment analysis and meta‑analysis identified 12 key genes regulating and controlling the prognosis of lung adenocarcinoma

He,Wenwu; Fu,Liangmin; Yan,Qunlun; Zhou,Qiuxi; Yuan,Kun; Chen,Linxin; Han,Yongtao

doi:10.3892/ol.2019.10236

Gene set enrichment analysis and meta‑analysis identified 12 key genes regulating and controlling the prognosis of lung adenocarcinoma

Authors:
- Wenwu He
- Liangmin Fu
- Qunlun Yan
- Qiuxi Zhou
- Kun Yuan
- Linxin Chen
- Yongtao Han
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Affiliations: Department of Thoracic Surgery, Sichuan Cancer Hospital and Research Institute, Chengdu, Sichuan 610041, P.R. China, Department of Clinical Medicine, North Sichuan Medical College, Nanchong, Sichuan 637000, P.R. China, Department of Respiratory Medicine, Nanchong Central Hospital, Nanchong, Sichuan 637000, P.R. China, Department of Anesthesiology, North Sichuan Medical College, Nanchong, Sichuan 637000, P.R. China
Published online on: April 9, 2019 https://doi.org/10.3892/ol.2019.10236
Pages: 5608-5618
Copyright: © He et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The aim of the present study was to analyze lung adenocarcinoma‑associated microarray data and identify potentially crucial genes. The gene expression profiles were downloaded from the Gene Expression Omnibus database and 6 datasets, of which 2 were discarded and 4 were retained, were preprocessed using packages in the R computing language. Subsequently, Gene Set Enrichment Analysis (GSEA) and meta‑analysis was used to screen the common pathways and differentially expressed genes at the transcriptional level. The genes detected from GSEA through The Cancer Genome Atlas databases were subsequently examined, and the crucial genes by survival data were identified. Pathways of the crucial genes were obtained using the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway of the online website Database for Annotation, Visualization and Integrated Discovery (DAVID) tool, and the pathways of crucial genes that were upregulated or downregulated were matched using the Venn method to identify the common crucial pathways. Furthermore, on the basis of the common crucial pathways, key genes that are closely associated with the development and progression of lung adenocarcinoma were identified with the KEGG pathway of DAVID. Additional information was obtained through Gene Ontology annotation. A total of two key pathways, including cell cycle and DNA replication, as well as 12 key genes [DNA polymerase δ subunit 2, DNA replication licensing factor MCM4, MCM6, mitotic checkpoint serine/threonine‑protein kinase BUB1, BUB1β, mitotic spindle assembly checkpoint protein MAD2A, dual specificity protein kinase TTK, M‑phase inducer phosphatase 1, cell division control protein 45 homolog, cyclin‑dependent kinase inhibitor 1C, pituitary tumor‑transforming gene 1 protein and polo‑like kinase 1] were identified. These key pathways and genes may be studied in future studies involving gene transfection/knockdown, which may provide insights into the prognosis of lung adenocarcinoma. Additional studies are required to confirm their biological function.

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