Email updates

Keep up to date with the latest news and content from BMC Genomics and BioMed Central.

Open Access Highly Accessed Research article

The SOX2 response program in glioblastoma multiforme: an integrated ChIP-seq, expression microarray, and microRNA analysis

Xuefeng Fang1235, Jae-Geun Yoon1, Lisha Li2, Wei Yu2, Jiaofang Shao2, Dasong Hua2, Shu Zheng3, Leroy Hood6, David R Goodlett5, Gregory Foltz1* and Biaoyang Lin124*

Author Affiliations

1 Swedish Neuroscience Institute, Swedish Medical Center, Seattle, WA 98122, USA

2 Zhejiang-California International NanoSystems Institute, Zhejiang University, Hangzhou, Zhejiang 310029, PR China

3 Cancer Institute (Key Laboratory of Cancer Prevention and Intervention, China National Ministry of Education), The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, PR China

4 Department of Urology, University of Washington, Seattle, WA 98195, USA

5 Department of Medicinal Chemistry, University of Washington, BOX 367610, Seattle, WA 98195, USA

6 The Institute for Systems Biology, Seattle, WA 98103, USA

For all author emails, please log on.

BMC Genomics 2011, 12:11  doi:10.1186/1471-2164-12-11

Published: 6 January 2011

Abstract

Background

SOX2 is a key gene implicated in maintaining the stemness of embryonic and adult stem cells. SOX2 appears to re-activate in several human cancers including glioblastoma multiforme (GBM), however, the detailed response program of SOX2 in GBM has not yet been defined.

Results

We show that knockdown of the SOX2 gene in LN229 GBM cells reduces cell proliferation and colony formation. We then comprehensively characterize the SOX2 response program by an integrated analysis using several advanced genomic technologies including ChIP-seq, microarray profiling, and microRNA sequencing. Using ChIP-seq technology, we identified 4883 SOX2 binding regions in the GBM cancer genome. SOX2 binding regions contain the consensus sequence wwTGnwTw that occurred 3931 instances in 2312 SOX2 binding regions. Microarray analysis identified 489 genes whose expression altered in response to SOX2 knockdown. Interesting findings include that SOX2 regulates the expression of SOX family proteins SOX1 and SOX18, and that SOX2 down regulates BEX1 (brain expressed X-linked 1) and BEX2 (brain expressed X-linked 2), two genes with tumor suppressor activity in GBM. Using next generation sequencing, we identified 105 precursor microRNAs (corresponding to 95 mature miRNAs) regulated by SOX2, including down regulation of miR-143, -145, -253-5p and miR-452. We also show that miR-145 and SOX2 form a double negative feedback loop in GBM cells, potentially creating a bistable system in GBM cells.

Conclusions

We present an integrated dataset of ChIP-seq, expression microarrays and microRNA sequencing representing the SOX2 response program in LN229 GBM cells. The insights gained from our integrated analysis further our understanding of the potential actions of SOX2 in carcinogenesis and serves as a useful resource for the research community.