Cited by 781Genomics and Chromatin DynamicsPluripotent Stem Cells ResearchEpigenetics and DNA Methylation

Pioneer Transcription Factors Target Partial DNA Motifs on Nucleosomes to Initiate Reprogramming

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Soufi, Abdenour, Garcia, Meilin Fernandez, Jaroszewicz, Artur, Osman, Nebiyu, Pellegrini, Matteo, Zaret, Kenneth S.·2015·Cell

Abstract

SUMMARY Pioneer transcription factors (TFs) access silent chromatin and initiate cell fate changes, using diverse types of DNA binding domains (DBDs). FoxA, the paradigm pioneer TF, has a winged helix DBD that resembles linker histone and thereby binds its target sites on nucleosomes and in compacted chromatin. Herein we compare the nucleosome and chromatin targeting activities of Oct4 (POU DBD), Sox2 (HMG box DBD), Klf4 (zinc finger DBD), and c-Myc (bHLH DBD), which together reprogram somatic cells to pluripotency. Purified Oct4, Sox2, and Klf4 proteins can bind nucleosomes in vitro, and in vivo they preferentially target silent sites enriched for nucleosomes. Pioneer activity relates simply to the ability of a given DBD to target partial motifs displayed on the nucleosome surface. Such partial motif recognition can occur by coordinate binding between factors. Our findings provide insight into how pioneer factors can target naïve chromatin sites.

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Crossref · 10.1016/j.cell.2015.03.017

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  • The pioneering model of reprogramming has been proposed for OSKM based on their ability to bind to chromatin not normally accessible by transcription factors.

    “The pioneering model of reprogramming has been proposed for OSKM based on their ability to bind to chromatin not normally accessible by transcription factors60–62.”

    From The NuRD complex cooperates with SALL4 to orchestrate reprogramming (2023) · cites this paper as [60]

    The Introduction (p. 3) says Oct4, Sox2 and Klf4 can function as pioneers because they target closed, DNase I-resistant chromatin. It explicitly excludes c-Myc from that finding; the paper later describes c-Myc targeting nucleosomal sites with assistance from other factors (p. 9). Thus the claim is supported for three OSKM factors, but overstates their shared ability. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • JGES reprogramming differs markedly from classic Yamanaka factors OSKM in that JGES relies on Sall4 to engage endogenous NuRD to close open chromatin in MEFs while OSKM relies on pioneering factors to open chromatin in MEFs.

    “We show here that JGES reprogramming differs markedly from the classic Yamanaka factors OSKM in that JGES relies on Sall4 to engage endogenous NuRD to close open chromatin in MEFs while OSKM relies on pioneering factors to open chromatin in MEFs10,60.”

    From The NuRD complex cooperates with SALL4 to orchestrate reprogramming (2023) · cites this paper as [60]

    The Introduction (p. 3) identifies Oct4, Sox2, and Klf4—but not c-Myc—as pioneer factors that target closed chromatin, and the Discussion (p. 11) reports their ability to target nucleosomal sites during reprogramming. The paper studies human fibroblasts and initial access to closed chromatin; these passages do not establish that OSKM opens chromatin in mouse embryonic fibroblasts (MEFs). The JGES–Sall4–NuRD comparison is presented as the citing authors’ own finding, not as a finding attributed to this source. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • The pluripotency factors OCT4, SOX2, and KLF4, when acting as pioneer TFs, bind nucleosomes in vitro by targeting partial and degenerate DNA motifs displayed on the nucleosome surface.

    “The pluripotency factors OCT4, SOX2, and KLF4, when acting as pioneer TFs, bind nucleosomes in vitro by targeting partial and degenerate DNA motifs displayed on the nucleosome surface (64).”
  • A half-site lacking the 'G' nucleotide from the canonical Ca/tTTGT motif has been observed at sites of nucleosomal binding by SOX2.

    “which has also been observed at sites of nucleosomal binding by the pioneer and pluripotency factor SOX2 (64).”
  • A few pioneer transcription factors, including OCT4, SOX2 and KLF4, were shown to recognize only partial motifs exposed on nucleosomes.

    “For example, a handful pioneer TFs (such as OCT4, SOX2 and KLF4) were shown to bind only partial motifs displayed on the nucleosome surface107.”

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Authors
Soufi, A., Garcia, M. F., Jaroszewicz, A., Osman, N., Pellegrini, M., & Zaret, K. S.
Affiliations
  • University of Pennsylvania (US)
  • University of California, Los Angeles (US)
Corresponding author
Zaret, Kenneth S.
Venue
Cell
Publisher
Elsevier BV
Published
2015-04
Volume
161
Issue
3
Pages
555-568
ISSN
0092-8674 (ISSN-L)
OpenAlex
W1971451591
Cited by
780
References
85
Citations by year
2026: 54 · 2025: 57 · 2024: 67 · 2023: 78 · 2022: 82 · 2021: 89 · 2020: 77 · 2019: 66 · 2018: 72 · 2017: 59 · 2016: 54 · 2015: 23 · 2013: 1
FWCI
30.09
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health
  • National Human Genome Research Institute (T32HG002536)
  • National Institute of General Medical Sciences (P01GM099134)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Pluripotent Stem Cells Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
pioneer transcription factors, nucleosome binding, DNA-binding domain, chromatin accessibility, cellular reprogramming, pluripotency, Oct4, SOX2, KLF4, c-Myc, HMG box, bHLH, zinc finger, silent chromatin, chromatin remodeling
MeSH terms
Kruppel-Like Factor 4, Amino Acid Sequence, DNA, Fibroblasts, Humans, Models, Molecular, Nucleosomes, Transcription Factors, Sequence Alignment, Protein Structure, Tertiary, Octamer Transcription Factor-3, Cell Dedifferentiation, Induced Pluripotent Stem Cells, Nucleotide Motifs, Cellular Reprogramming

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