Search

Transcription-Coupled Nucleotide Excision Repair (TC-NER) removes transcription-blocking DNA lesions. This study reveals that DDA1 is a crucial player in TC-NER, protecting transcription programs against genotoxic insults.

Nucleotide excision repair proteins are involved in the repair of UV-induced DNA damage. Here, the authors show that NER proteins, DDB2, XPC, and XPA play a vital role in the 8-oxoguanine repair by coordinating with base excision repair protein OGG1.

Consensus exists on the urgent need for food systems to be more sustainable, but defining their environmentally safe operating space is challenging. This study proposes food system boundaries as a share of planetary boundaries, defining budgets across nine boundaries and revealing where boundary transgression is most critical.

Jurgen Marteijn, Wim Vermeulen and colleagues report proteomic identification of UVSSA in a UV-induced protein complex implicated in UV-sensitive syndrome. They show that knockdown of UVSSA impairs trancription-coupled nucleotide-excision repair.

An integrated network of chaperones and protein degradation machineries called the proteostasis network (PN) is required to maintain protein homeostasis. Here the authors show that one of the components of the PN, the chaperonin TRiC, interacts with the core transcription-coupled nucleotide excision repair protein CSA to ensure its assembly into the CRLCSA complex.

Characterization of a new human XPF mutation (XFE) that leads to profound DNA intrastrand crosslink sensitivity and progeroid symptoms is reported, indicating that the accumulation of DNA damage induces a metabolic response aimed at extending life span rather than maintaining growth.

DNA damage sensors DDB2 and XPC are fundamental factors to initiate global genome nucleotide excision repair and protect DNA from mutagenesis. Here the authors reveal that ubiquitin and TFIIH-stimulated DDB2 dissociation promotes DNA damage handover to XPC in nucleotide excision repair.

Hereditary nucleotide excision repair deficiencies cause different cancerous and progeroid disorders of which the exact etiology is not understood. This study finds that prolonged binding of DNA repair factor TFIIH to DNA damage contributes to a more severe phenotype caused by DNA repair deficiency.

Transcription-blocking DNA lesions result in chromatin displacement of core spliceosomes containing U2 and U5 snRNPs; consequently, R-loops containing the nascent transcript are formed, which activate ATM in a feed-forward fashion to influence spliceosome dynamics and alternative splicing.

Three studies identify a transcription-coupled DNA–protein crosslink repair pathway that depends on the Cockayne syndrome proteins and the proteasome.

Two side-by-side papers report that the transcription elongation factor ELOF1 drives transcription-coupled repair and prevents replication stress.

A global model finds that the environmental impacts of the food system could increase by 60–90% by 2050, and that dietary changes, improvements in technologies and management, and reductions in food loss and waste will all be needed to mitigate these impacts.

SWI/SNF genes are commonly found to be mutated in different cancers. Here the authors report that the remodelers BRM and BRG1 are necessary for efficient nucleotide excision repair by promoting the expression of TFIIH subunit GTF2H1.

The SUMO-targeted ubiquitin ligase RNF111 promotes K63-linked ubiquitylation of SUMOylated XPC after DNA damage. Here the authors show that RNF111 is responsible for sequential XPC ubiquitylation, and RNF111-mediated ubiquitylation promotes the release of XPC from damaged DNA after NER initiation.

RNA–DNA hybrids are immunogenic species that can aberrantly accumulate in the cytoplasm after R-loop processing, linking R-loop accumulation to cell death through the innate immune response.

Nucleotide excision repair (NER) eliminates structurally diverse DNA lesions by repairing helix-distorting damage throughout the genome as well as transcription-blocking lesions. NER defects result in a wide range of disease phenotypes and recent findings have led to a mechanistic model that explains the complex genotype–phenotype correlations of transcription-coupled repair disorders.

Leonard van den Berg, Roel Ophoff and colleagues present a genome-wide association study of sporadic amyotrophic lateral sclerosis. The work uncovers associated SNPs at 9p21.2 and an associated locus at 19p13.3 mapping to the UNC13A gene.

Transcription-blocking DNA lesions (TBLs) cause transcription stress and are repaired by transcription-coupled nucleotide excision repair (TC-NER). TBL detection by the stalling of RNA polymerase II is highly efficient but may interfere with repair, and overall with transcription and replication. Consequently, TC-NER deregulation causes hereditary disorders with complex genotype–phenotype correlations.

Hereditary mutations in TTDA/GTF2H5 cause a photosensitive form of the rare developmental disorder trichothiodystrophy, however the development of models has been hampered by mutations being lethal. Thijssen et al. show that deficiency of C. elegans TTDA ortholog GTF-2H5 is, compatible with life, in contrast to depletion of other TFIIH subunits and thus propose that this model could be used for studying the pathogenesis of trichothiodystrophy.