In silico identification of a core regulatory network of OCT4 in human embryonic stem cells using an integrated approach.
BACKGROUND
The transcription factor OCT4 is highly expressed in pluripotent embryonic stem cells which are derived from the inner cell mass of mammalian blastocysts. Pluripotency and self renewal are controlled by a transcription regulatory network governed by the transcription factors OCT4, SOX2 and NANOG. Recent studies on reprogramming somatic cells to induced pluripotent stem cells highlight OCT4 as a key regulator of pluripotency.


RESULTS
We have carried out an integrated analysis of high-throughput data (ChIP-on-chip and RNAi experiments along with promoter sequence analysis of putative target genes) and identified a core OCT4 regulatory network in human embryonic stem cells consisting of 33 target genes. Enrichment analysis with these target genes revealed that this integrative analysis increases the functional information content by factors of 1.3 - 4.7 compared to the individual studies. In order to identify potential regulatory co-factors of OCT4, we performed a de novo motif analysis. In addition to known validated OCT4 motifs we obtained binding sites similar to motifs recognized by further regulators of pluripotency and development; e.g. the heterodimer of the transcription factors C-MYC and MAX, a prerequisite for C-MYC transcriptional activity that leads to cell growth and proliferation.


CONCLUSIONS
Our analysis shows how heterogeneous functional information can be integrated in order to reconstruct gene regulatory networks. As a test case we identified a core OCT4-regulated network that is important for the analysis of stem cell characteristics and cellular differentiation. Functional information is largely enriched using different experimental results. The de novo motif discovery identified well-known regulators closely connected to the OCT4 network as well as potential new regulators of pluripotency and differentiation. These results provide the basis for further targeted functional studies.
Chavez
Lukas
L
Department of Vertebrate Genomics, Max-Planck-Institute for Molecular Genetics, Berlin, Germany. chavez@molgen.mpg.de
Bais
Abha S
AS
Vingron
Martin
M
Lehrach
Hans
H
Adjaye
James
J
Herwig
Ralf
R
D001665:Binding Sites; D002454:Cell Differentiation; D053595:Embryonic Stem Cells / Q000378:metabolism*; D020869:Gene Expression Profiling; D018507:Gene Expression Regulation, Developmental; D053263:Gene Regulatory Networks; D006801:Humans; D050814:Octamer Transcription Factor-3 / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D039904:Pluripotent Stem Cells / Q000378:metabolism; D011401:Promoter Regions, Genetic
D050814:Octamer Transcription Factor-3; C494173:POU5F1 protein, human