The control of gene expression in multicellular organisms is a higly regulated process and can be divided into transcriptional and posttranscriptional regulatory events. The transcriptional regulation is controlled by a complex network of different regulatory proteins. These proteins modulate the activity of the RNA polymerase, the enzyme that performs the transcription of a gene (functional region in a genome, which is transcibed). Post-transcriptional regulation is controlled by different proteins and RNAs which are combined in different post-transcriptional regulatory processes. These processes change the amount of transcribed RNA specifically and unspecifically.
Transcription factors (TFs) are proteins that regulate the efficiency of the transcription. Most of them act by recognizing cis-regulatory elements or transcription factor binding sites (TFBSs). Each active transcribed gene in a cell is regulated by a set of TFs which are bound to a regulatory region. The different TFs either bind directly to a regulatory region through the present TFBS or interact indirectly with previously sequence-specifically bound TFs. There are several distinguishable regulatory regions for one gene.
All of these TF-bound regions are aggregated at the transcription start site (TSS) and from a huge Protein-DNA-complex to define the necessary transcriptional activity for each gene. This complex influences the transcriptional initiation mainly.
Most of the DNA in transcriptional active cells is compacted by a protein complex called nucleosome. Further compaction levels provide an organizational structure of the genomic material in a cell type specific manner (chromatin structure). A complex interaction network of post-transcriptional modifications and composition of these nucleosomes indicate distinct regions in the genome. On the basis of these structures, regulatory active regions, transcriptionally active regions (genes) or inactive sites in a genome can be differentiated.
In our work on gene regulation we are intersted in the coordinated functions of TFs and proteins which define the chromatin structure in a cell type specific manner. Using different time or cell type specific data based on healthy or disease conditions, we hope to understand the relationship between these two different regulatory levels in more detail.
We are working on the following topics:
- Prediction of TFBSs
- Prediction and analysis of transcriptional networks
- Analysis of DNA hypersensitivity assays, immunoprecipitation (IP) of proteins that interact with DNA, modified histones, chromatin remodelling proteins and transcription factors sequencing data
- Application of machine learning methods to analyze nucleosome positioning, transcription factor binding sites composition in the context of proximal and distal regulatory interactions
Wingender E., Schoeps T., Haubrock M., Dönitz J.:
TFClass: expanding the classification of human transcription factors to their mammalian orthologs.
Nucleic Acids Res. 2018 Jan. 4;46(D1):D343-D347
Haubrock M., Hartmann F., Wingender E.:
NF-Y binding Site Architecture Defines a C-Fos targeted Promoter Class.
PLoS One. 2016 Aug. 12; 11(8):e0160803
Schirmer M.A., lüske C.M., Roppel S., Schaudinn A., Zimmer C., Pflüger R., Haubrock M., Rapp J., Güngör C., Bockhorn M., Hackert T., hank T., Stroebel O., Werner J., Izbicki J.R., Johnsen S.A., Gaedecke J., Brockmöller J., Ghadimi B.M.:
Relevance of Sp Binding Site Polymorphism in WWOX for Treatment Outcome in Pancreatic Cancer.
J. Natl. Cancer Inst. 2016 Feb. 8; 108(5)
Members of the group
Currently the following people work together to achieve our aims:
- Malte Sahrhage (PhD-student)
- Karly Conrads (PhD-student)
- Hazal Timucin (PhD-student)
- Niels Benjamin Paul (PhD-student, Cooperation with Prof. Hasenfuß (UMG))
- Norman Weinert (Master Student)
- Vivian Raulin (Master Student)
- Tim Van-den-Berg (Research Assistant)
- Carolin Brune (Bachelor Student)
- Christian Ickes (Bachelor Student)
Bachelor- or Master thesis
We offer different topics for Bachelor- or Master thesis in this field.
If you are interessed, please contact:
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