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Targeting rogue DNA repair and genomic instability as novel toxicity mechanisms in C9orf72 ALS/FTD

Project description

How DNA instability drives ALS and dementia

A tiny genetic glitch can have devastating effects on the brain. In Europe, the most common genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) is a repeat expansion in the C9orf72 gene. It is a mutation whose destructive mechanism remains a mystery. The ERC-funded epiC9repair project aims to explore a groundbreaking explanation: that faulty DNA repair and chromatin instability at this gene’s locus trigger the chain of events leading to neuron death. Using cutting-edge CRISPR screens, chromatin mapping, and studies of patient-derived cells, the project will uncover how DNA damage and epigenetic changes drive these diseases. By pinpointing the repair pathways involved, the project aims to pave the way for therapies.

Objective

Repeat expansions are a major cause of neurodegenerative diseases, but causal therapies are not available. A (G4C2)n repeat expansion in C9orf72 is the most common genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia (FTD) in Europe. Despite extensive research, the mechanisms linking these expansions to selective neurodegeneration remain poorly understood. Our project, epiC9repair, explores the novel hypothesis that genomic instability at the C9orf72 locus, driven by aberrant DNA repair and repeat-induced chromatin changes, is a critical factor in ALS/FTD pathogenesis. This project builds on our recent observation that the C9orf72 repeat is also a hotspot of DNA synthesis in post-mitotic neurons, and on recent findings in Huntington’s disease that cell type-specific somatic expansion of the pathogenic (CAG)n repeat drives neurodegeneration by unknown mechanisms.
Using advanced CRISPR screens and innovative chromatin mapping techniques, we aim to uncover the DNA repair pathways that drive genomic instability in C9orf72 ALS/FTD and how these pathways contribute to neurodegeneration. In addition, we will investigate the role of epigenetic modifications in cell culture models and patient tissues, with a focus on identifying biomarkers that correlate with disease progression and regional neurodegeneration. These findings will inform studies in mouse models to test the therapeutic potential of targeting genomic instability. This multidisciplinary approach has the potential to transform our understanding of C9orf72-related diseases and paves the way for targeted therapeutic strategies that address the root causes of genomic instability in neurodegeneration.

Fields of science (EuroSciVoc)

Keywords

Programme(s)

Topic(s)

Funding Scheme

HORIZON-ERC - HORIZON ERC Grants

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Call for proposal

(opens in new window) ERC-2024-ADG

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Host institution

DEUTSCHES ZENTRUM FUR NEURODEGENERATIVE ERKRANKUNGEN EV
Net EU contribution
€ 2 498 905,00
Address
VENUSBERG-CAMPUS 1/99
53127 Bonn
Germany
Region
Nordrhein-Westfalen Köln Bonn, Kreisfreie Stadt
Activity type
Research Organisations
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Total cost
No data

Beneficiaries (1)