Mutant FUS causes DNA ligation defects to inhibit oxidative damage repair in Amyotrophic Lateral Sclerosis

Haibo Wang, Wenting Guo, Joy Mitra, Pavana M. Hegde, Tijs Vandoorne, Bradley J. Eckelmann, Sankar Mitra, Alan E. Tomkinson, Ludo Bosch and Muralidhar L. Hegde ()
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Haibo Wang: Houston Methodist Research Institute
Wenting Guo: Experimental Neurology and Leuven Brain Institute (LBI)
Joy Mitra: Houston Methodist Research Institute
Pavana M. Hegde: Houston Methodist Research Institute
Tijs Vandoorne: Experimental Neurology and Leuven Brain Institute (LBI)
Bradley J. Eckelmann: Houston Methodist Research Institute
Sankar Mitra: Houston Methodist Research Institute
Alan E. Tomkinson: University of New Mexico
Ludo Bosch: Experimental Neurology and Leuven Brain Institute (LBI)
Muralidhar L. Hegde: Houston Methodist Research Institute

Nature Communications, 2018, vol. 9, issue 1, 1-18

Abstract: Abstract Genome damage and defective repair are etiologically linked to neurodegeneration. However, the specific mechanisms involved remain enigmatic. Here, we identify defects in DNA nick ligation and oxidative damage repair in a subset of amyotrophic lateral sclerosis (ALS) patients. These defects are caused by mutations in the RNA/DNA-binding protein FUS. In healthy neurons, FUS protects the genome by facilitating PARP1-dependent recruitment of XRCC1/DNA Ligase IIIα (LigIII) to oxidized genome sites and activating LigIII via direct interaction. We discover that loss of nuclear FUS caused DNA nick ligation defects in motor neurons due to reduced recruitment of XRCC1/LigIII to DNA strand breaks. Moreover, DNA ligation defects in ALS patient-derived iPSC lines carrying FUS mutations and in motor neurons generated therefrom are rescued by CRISPR/Cas9-mediated correction of mutation. Our findings uncovered a pathway of defective DNA ligation in FUS-linked ALS and suggest that LigIII-targeted therapies may prevent or slow down disease progression.

Date: 2018
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DOI: 10.1038/s41467-018-06111-6

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