Projects Offered

 1 PhD project offered in the IPP summer call Molecular Mechanisms in Genome Stability & Gene Regulation

Scientific Background

R-loops are secondary DNA structures consisting of an RNA-DNA hybrid and a single stranded DNA that can form behind the elongating RNA polymerase II during transcription. R-loops play regulatory roles during transcription initiation and termination. However, the accumulation of R-loops in the genome results in replication stress, DNA double-strand breaks and genomic instability. A number of proteins including ribonucleases, helicases and translocases have been shown to regulate R-loop levels in cells. In recent years, R-loops have been recognized as a major cell-intrinsic source of genomic instability, and dysregulation of R-loop processing is associated with cancer and neurodegenerative diseases. We have developed an unbiased mass spectrometry-based proteomics approach to identify proteins that regulate R-loops in human cells and discovered a role for the tumor suppressor DDX41 in R-loop resolution. 

PhD Project: Mechanisms opposing R-loop-associated DNA double strand breaks

The PhD project will be part of the DFG-funded SFB 1361 “Regulation od DNA Repair and Genome Stability”. The PhD student will profit from collaboration and networking with other research groups, all focusing on understanding the molecular mechanisms modulating genome maintenance pathways in the cell. The Beli group has expertise in quantitative proteomics approaches in analyzing protein interactions and regulation on chromatin. The project will focus on understanding the regulation of Ribonuclease H1, which digests the RNA moiety in the R-loops and plays a central role in R-loop resolution. We will analyze how the activity of this enzyme is directed to pathological compared to regulatory R-loops to maintain genome stability. In this regard, we will focus on phosphorylation and ubiquitylation as well as the compartmentalization of pathological R-loops in biological condensates. Furthermore, we will analyze systems-wide responses to R-loop-associated genomic instability, also exploring the interplay between R-loop accumulation and inflammatory response. We will take advantage of unique tools that were previously developed in our lab to map R-loops and associated proteins with proximity-based proteomics and high-content microscopy.

If you are interested in this project, please select Beli as your group preference in the IPP application platform.

Publications relevant to this project

Mosler T, Conte F, Longo GMC, Mikicic I, Kreim N, Möckel MM, Petrosino G, Flach J, Barau J, Luke B, Roukos V, Beli P (2021) R-loop proximity proteomics identifies a role of DDX41 in transcription-associated genomic instability. Nat Commun. Dec 16;12(1):7314. Link

Longo GMC, Sayols S, Kotini AG, Heinen S, Möckel MM, Beli P, Roukos V. (2024) Linking CRISPR-Cas9 double-strand break profiles to gene editing precision with BreakTag. Nat Biotechnol. 13. Link