PreprintCited by 65Pluripotent Stem Cells ResearchTelomeres, Telomerase, and SenescenceGenetics, Aging, and Longevity in Model Organisms

Coupling shRNA screens with single-cell RNA-seq identifies a dual role for mTOR in reprogramming-induced senescence

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Aarts, Marieke, Georgilis, Athena, Beniazza, Meryam, Beolchi, Patrizia, Banito, Ana, Carroll, Thomas, Kulisic, Marizela, Kaemena, Daniel F. +7 more·2017·Genes & Development

Abstract

Expression of the transcription factors OCT4, SOX2, KLF4, and cMYC (OSKM) reprograms somatic cells into induced pluripotent stem cells (iPSCs). Reprogramming is a slow and inefficient process, suggesting the presence of safeguarding mechanisms that counteract cell fate conversion. One such mechanism is senescence. To identify modulators of reprogramming-induced senescence, we performed a genome-wide shRNA screen in primary human fibroblasts expressing OSKM. In the screen, we identified novel mediators of OSKM-induced senescence and validated previously implicated genes such as CDKN1A. We developed an innovative approach that integrates single-cell RNA sequencing (scRNA-seq) with the shRNA screen to investigate the mechanism of action of the identified candidates. Our data unveiled regulation of senescence as a novel way by which mechanistic target of rapamycin (mTOR) influences reprogramming. On one hand, mTOR inhibition blunts the induction of cyclin-dependent kinase (CDK) inhibitors (CDKIs), including p16 INK4a, p21 CIP1, and p15 INK4b, preventing OSKM-induced senescence. On the other hand, inhibition of mTOR blunts the senescence-associated secretory phenotype (SASP), which itself favors reprogramming. These contrasting actions contribute to explain the complex effect that mTOR has on reprogramming. Overall, our study highlights the advantage of combining functional screens with scRNA-seq to accelerate the discovery of pathways controlling complex phenotypes.

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  • The mechanistic target of rapamycin (mTOR) complex can either counteract or facilitate reprogramming by cell-intrinsic and cell-extrinsic mechanisms, respectively.

    “In this sense, a crucial role for the mechanistic target of rapamycin (mTOR) complex has recently been unveiled, whereby it can either counteract or facilitate reprogramming by cell-intrinsic and cell-extrinsic mechanisms, respectively.69”

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Authors
Aarts, M., Georgilis, A., Beniazza, M., Beolchi, P., Banito, A., Carroll, T., Kulisic, M., Kaemena, D. F., Dharmalingam, G., Martin, N., Reik, W., Zuber, J., Kaji, K., Chandra, T., & Gil, J.
Affiliations
  • MRC London Institute of Medical Sciences (GB)
  • MRC Centre for Regenerative Medicine (GB)
  • Babraham Institute (GB)
  • Research Institute of Molecular Pathology (AT)
Venue
Genes & Development
Published
2017-10-15
Volume
31
Issue
20
Pages
2085-2098
ISSN
  • 0890-9369 (ISSN-L)
  • 1549-5477
OpenAlex
W2770882386
Cited by
64
References
53
Citations by year
2026: 5 · 2025: 7 · 2024: 6 · 2023: 3 · 2022: 8 · 2021: 7 · 2020: 11 · 2019: 9 · 2018: 8
Type
posted content
Language
en
Open access
Licence
cc-by
Locations
  • Genes & Development (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, cc-by)
  • Spiral (Imperial College London) (submittedVersion, cc-by)
Funders
  • Medical Research Council
  • Centennary Award
  • Biotechnology and Biological Sciences Research Council East of Scotland BioScience Doctoral Training Partnership
  • MRC-British Heart Foundation Cardiovascular Stem Cell Research Strategic Development (G0901467)
  • MRC (MC_U120085810)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pluripotent Stem Cells Research
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
Keywords
mTOR, induced pluripotent stem cells, OSKM, somatic cell reprogramming, senescence-associated secretory phenotype, p21, cyclin-dependent kinase inhibitors, p16INK4a, CDKN2B, fibroblasts, shRNA screen, single-cell RNA sequencing
MeSH terms
Kruppel-Like Factor 4, Animals, Cells, Cultured, Fibroblasts, Humans, Transcription Factors, Cellular Senescence, Sequence Analysis, RNA, Gene Expression Profiling, RNA, Small Interfering, Cyclin-Dependent Kinase Inhibitor p21, Mice, TOR Serine-Threonine Kinases, Single-Cell Analysis, Cellular Reprogramming

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