Cited by 10Telomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model OrganismsDNA Repair Mechanisms

A natural variation-based screen in mouse cells reveals USF2 as a regulator of the DNA damage response and cellular senescence

Open access
Kang, Taekyu, Moore, Emily C, Kopania, Emily E K, King, Christina D, Schilling, Birgit, Campisi, Judith, Good, Jeffrey M, Brem, Rachel B·2023·G3: Genes, Genomes, Genetics

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Abstract

Cellular senescence is a program of cell cycle arrest, apoptosis resistance, and cytokine release induced by stress exposure in metazoan cells. Landmark studies in laboratory mice have characterized a number of master senescence regulators, including p16INK4a, p21, NF-κB, p53, and C/EBPβ. To discover other molecular players in senescence, we developed a screening approach to harness the evolutionary divergence between mouse species. We found that primary cells from the Mediterranean mouse Mus spretus, when treated with DNA damage to induce senescence, produced less cytokine and had less-active lysosomes than cells from laboratory Mus musculus. We used allele-specific expression profiling to catalog senescence-dependent cis-regulatory variation between the species at thousands of genes. We then tested for correlation between these expression changes and interspecies sequence variants in the binding sites of transcription factors. Among the emergent candidate senescence regulators, we chose a little-studied cell cycle factor, upstream stimulatory factor 2 (USF2), for molecular validation. In acute irradiation experiments, cells lacking USF2 had compromised DNA damage repair and response. Longer-term senescent cultures without USF2 mounted an exaggerated senescence regulatory program—shutting down cell cycle and DNA repair pathways, and turning up cytokine expression, more avidly than wild-type. We interpret these findings under a model of pro-repair, anti-senescence regulatory function by USF2. Our study affords new insights into the mechanisms by which cells commit to senescence, and serves as a validated proof of concept for natural variation-based regulator screens.

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  • These two factors have been primarily reported to induce senescence in prostate cancer and repress senescence in mice primary tail fibroblast cells, consistent with our findings.

    “While there is no previous evidence supporting the broad senescence features of these two factors, they have been primarily reported to induce senescence in prostate cancer and repress senescence in mice primary tail fibroblast cells, respectively,113,114 which is consistent with our findings.”

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Authors
Kang, T., Moore, E. C., Kopania, E. E. K., King, C. D., Schilling, B., Campisi, J., Good, J. M., & Brem, R. B.
Affiliations
  • Buck Institute for Research on Aging (US)
  • University of Montana (US)
Corresponding author
Brem, Rachel B
Venue
G3: Genes, Genomes, Genetics
Published
2023-04-25
Volume
13
Issue
7
ISSN
2160-1836 (ISSN-L)
OpenAlex
W4366996754
Cited by
10
References
113
Citations by year
2026: 5 · 2025: 3 · 2024: 2
FWCI
1.78
Type
journal article
Language
en
Open access
Locations
  • G3 Genes Genomes Genetics (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Science Foundation (1313190)
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM120430)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01HD094787)
Topics
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
USF2, cellular senescence, DNA damage response, DNA repair, interspecies variation, Mus spretus, allele-specific expression, cis-regulatory variation, transcription factor binding sites, cytokine expression, cell cycle arrest, irradiation
MeSH terms
Animals, Cell Cycle, DNA Damage, Tumor Suppressor Protein p53, Cytokines, Cellular Senescence, Mice, Upstream Stimulatory Factors

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