Mining the role of RECQL5 in gastric cancer and seeking potential regulatory network by bioinformatics analysis.

AIM:The role of RecQ protein-like 5 (RECQL5) in gastric carcinoma (GC) is still unclear. Here, we investigated the role of RECQL5 in human GC and its potential regulatory network via bioinformatics analysis. METHODS:Bioinformatic analysis was performed using data in the Oncomine database, Kaplan- Meier Plotter online software, MethHC database, catalogue of somatic mutations in cancer (COSMIC), cbioportal database and String database. Then, we verified the association between RECQL5 expression and GC prognosis by immunohistochemistry (IHC). The independent prognostic factors were determined by Cox multivariate analysis. RESULTS:It was found that both the mRNA and protein expression levels of RECQL5 were downregulated in GC samples (P < .05). Low RECQL5 expression indicated a poor prognosis in GC patients and is the independent prognostic factors for GC. No correlation between RECQL5 mRNA and DNA methylation was found using the MethHC database. The analysis of the COSMIC database showed a high proportion of missense mutation in GC. The functional enrichment analysis predicted that RECQL5 plays a role in DNA repair and cellular responses to DNA damage stimulus. RECQL5 might be enriched in homologous recombination pathways and Fanconi anemia pathway. Bioinformatics analysis identified 5 genes, namely POLR2D, POLR2G, DXO, KIN, and EIF2D, that were significantly correlated with RECQL5. CONCLUSION:The low expression of RECQL5 predicts poor overall survival in GC. RECQL5 may be a novel tumor suppressor for patients with GC.

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