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Published on: January 9, 2019
Genome-wide analysis of OCT4 binding sites in glioblastoma cancer cells
Xue-feng Fang1, Wei-yi Zhang, Na Zhao
1Key Laboratory of Cancer Prevention and Intervention of Ministry of Education, Cancer Institute, the Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
Abstract:
OCT4, a member of the POU family of gene products, is an octamer motif-binding transcription factor. As it is known to play a crucial role in cancer processes including proliferation, invasion, and chemoradioresistance, it is important to identify the direct targets of OCT4 in living cancer cells. Here, chromatin immunoprecipitation-sequencing (ChIP-seq) was used to identify OCT4 binding sites in glioblastoma cancer cells. The results showed that 5438 OCT4 binding sites were localized in the glioblastoma cancer genome and that these sites contained a consensus sequence TTTkswTw (k=T or G, s=C or G, w=A or T), which occurred 3931 times in 2312 OCT4 binding regions. Furthermore, binding motifs of some other transcription factors were identified in OCT4 binding regions. Our results provide a valuable dataset for understanding gene regulation mechanisms underlying the function of OCT4 in glioblastoma cancer.
Insights
This study identified OCT4 binding sites in glioblastoma cells using ChIP-seq, revealing key genomic regions and DNA motifs. These findings enhance understanding of OCT4
Area of Science:
- Genomics
- Cancer Biology
- Molecular Biology
Background:
- OCT4 (POU family transcription factor) is vital in cancer progression, influencing proliferation, invasion, and treatment resistance.
- Understanding OCT4's direct targets in cancer cells is crucial for developing targeted therapies.
Purpose of the Study:
- To identify direct OCT4 binding sites within the glioblastoma cancer genome.
- To characterize the consensus DNA motif recognized by OCT4 in these cells.
- To explore co-binding motifs of other transcription factors in OCT4-occupied regions.
Main Methods:
- Chromatin immunoprecipitation followed by sequencing (ChIP-seq) was employed to map OCT4 binding sites.
- Bioinformatic analysis was used to identify the consensus DNA sequence and other transcription factor binding motifs.
Main Results:
- 5,438 OCT4 binding sites were identified in the glioblastoma genome.
- A consensus OCT4 binding motif (TTTkswTw) was discovered, appearing frequently in 2,312 binding regions.
- Binding motifs for other transcription factors were also found within OCT4 binding regions, suggesting combinatorial regulation.
Conclusions:
- This study provides a comprehensive dataset of OCT4 binding sites in glioblastoma.
- The identified binding motif and co-factor information offer insights into OCT4-mediated gene regulation in cancer.
- The findings are valuable for future research on OCT4's role in glioblastoma and potential therapeutic strategies.
