Deficiency of nucleotide excision repair is associated with mutational signature observed in cancer

Myrthe Jager, Francis Blokzijl, Ewart Kuijk, Johanna Bertl, Maria Vougioukalaki, Roel Janssen, Nicolle Besselink, Sander Boymans, Joep de Ligt, Jakob Skou Pedersen, Jan Hoeijmakers, Joris Pothof, Ruben van Boxtel, Edwin Cuppen

Onderzoeksoutput: Bijdrage aan tijdschriftArtikelpeer review

Samenvatting

Nucleotide excision repair (NER) is one of the main DNA repair pathways that protect cells against genomic damage. Disruption of this pathway can contribute to the development of cancer and accelerate aging. Mutational characteristics of NER-deficiency may reveal important diagnostic opportunities, as tumors deficient in NER are more sensitive to certain treatments. Here, we analyzed the genome-wide somatic mutational profiles of adult stem cells (ASCs) from NER-deficient Ercc1 -/Δ mice. Our results indicate that NER-deficiency increases the base substitution load twofold in liver but not in small intestinal ASCs, which coincides with the tissue-specific aging pathology observed in these mice. Moreover, NER-deficient ASCs of both tissues show an increased contribution of Signature 8 mutations, which is a mutational pattern with unknown etiology that is recurrently observed in various cancer types. The scattered genomic distribution of the base substitutions indicates that deficiency of global-genome NER (GG-NER) underlies the observed mutational consequences. In line with this, we observe increased Signature 8 mutations in a GG-NER-deficient human organoid culture, in which XPC was deleted using CRISPR-Cas9 gene-editing. Furthermore, genomes of NER-deficient breast tumors show an increased contribution of Signature 8 mutations compared with NER-proficient tumors. Elevated levels of Signature 8 mutations could therefore contribute to a predictor of NER-deficiency based on a patient's mutational profile.

Originele taal-2Engels
Pagina's (van-tot)1067-1077
Aantal pagina's11
TijdschriftGenome research
Volume29
Nummer van het tijdschrift7
DOI's
StatusGepubliceerd - jul. 2019

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