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Previously, we have reported that transcription factor E2F1 expression is up-regulated in approximately 95% of small cell lung cancer tissue samples and closely associated with invasion and metastasis, but few studies have investigated specific target genes regulated by E2F1 in this disease. The aim of this study was to clarify the target genes controlled by E2F1 in the small cell lung cancer cell line H1688. The results of chromatin immunoprecipitation sequencing (ChIP-seq) showed that total 5 326 potential target genes were identified, in which 4 700 were structural genes and 626 long non-coding RNAs (lncRNAs). Gene Ontology (GO) and enrichment map analysis results indicated that these target genes were associated with three main functions: (1) cell cycle regulation, (2) chromatin and histone modification, and (3) protein transport. MEME4.7.0 software was used to identify the E2F1 binding DNA motif, and six motifs were discovered for coding genes and lncRNAs. These results clarify the target genes of E2F1, and provide the experimental basis for further exploring the roles of E2F1 in tumorigenesis, development, invasion and metastasis, recurrence, and drug resistance in small cell lung cancer.
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