Cited by 393Genomics and Chromatin DynamicsHemoglobinopathies and Related DisordersChromatin Remodeling and Cancer

The DOI matches its Crossref record; 42 of the 42 references it cites were found in a registry or an index; 7 of the 11 sources its claims cite were checked for support.

Genetic dissection of the α-globin super-enhancer in vivo

Open access
Hay, Deborah, Hughes, Jim R, Babbs, Christian, Davies, James O J, Graham, Bryony J, Hanssen, Lars L P, Kassouf, Mira T, Oudelaar, A Marieke, Sharpe, Jacqueline A, Suciu, Maria C, Telenius, Jelena, Williams, Ruth, Rode, Christina, Li, Pik-Shan, Pennacchio, Len A, Sloane-Stanley, Jacqueline A, Ayyub, Helena, Butler, Sue, Sauka-Spengler, Tatjana, Gibbons, Richard J, Smith, Andrew J H, Wood, William G, Higgs, Douglas R·2016·Nature Genetics

Abstract

Many genes determining cell identity are regulated by clusters of Mediator-bound enhancer elements collectively referred to as super-enhancers. These super-enhancers have been proposed to manifest higher-order properties important in development and disease. Here we report a comprehensive functional dissection of one of the strongest putative super-enhancers in erythroid cells. By generating a series of mouse models, deleting each of the five regulatory elements of the α-globin super-enhancer individually and in informative combinations, we demonstrate that each constituent enhancer seems to act independently and in an additive fashion with respect to hematological phenotype, gene expression, chromatin structure and chromosome conformation, without clear evidence of synergistic or higher-order effects. Our study highlights the importance of functional genetic analyses for the identification of new concepts in transcriptional regulation.

Overview

AI snapshot

Written from the paper’s full text.

TL;DR

A functional dissection of the mouse α-globin super-enhancer shows that its five constituent elements act independently and additively, with no evidence of synergistic or higher-order super-enhancer properties. Only R1 and R2 behave as strong enhancers in vivo, while R3, R4 and Rm contribute little or nothing to α-globin expression.

Key findings

  • In primary mouse erythroid cells, 15,849 DNase I hypersensitive sites were identified; after filtering, 1,963 putative enhancers were defined, and 95 regions (<7%) were classified as super-enhancers by Med1 occupancy. The α- and β-globin regulatory regions were the two highest-scoring erythroid super-enhancers.
  • The mouse α-globin super-enhancer spans 24 kb and contains five enhancer-like elements. R1 and R2 were strong enhancers in vivo; R3, R4 and Rm had little or no discernible impact on α-globin RNA synthesis, despite chromatin signatures and positive transient enhancer assays.
  • Deletion of R1 or R2 individually caused significant, reproducible reductions in α-globin RNA synthesis and increased reticulocyte counts, while R1/R2 double homozygotes died in utero at ~E14.5 and produced very little α-globin RNA, with remaining <10% of normal α-globin RNA levels likely transcribed under intact cis-elements.
  • Chromatin structure and chromosome conformation were largely independent of the intact super-enhancer: no individual hypersensitive site depended on any other, and even in R1/R2−/− cells, hypersensitive sites at R3, R4 and Rm still formed; Capture-C showed little change in the tissue-specific chromatin compartment.

Methods

  • Mouse models: seven homologous-recombination models were generated, deleting each of the five α-globin super-enhancer elements singly (R1, R2, R3, Rm, R4) plus two informative double knockouts (R2/R3 and R1/R2).
  • Data types: primary mouse erythroid cells were profiled by DNase I hypersensitivity, ChIP-seq for chromatin marks and transcription factors, ATAC-seq, and Next Generation Capture-C; enhancer activity was tested in transient chick reporter assays and stably integrated mouse LacZ transgenic assays.
  • Expression and phenotype: hematologic parameters, reticulocyte counts, total and nascent RNA (4-thiouridine labeling followed by NanoString) were measured in fetal liver erythroid cultures and adult mice; statistical analysis used Levene’s test followed by one-way ANOVA with Dunnett’s correction.

Limitations

  • Stated: the authors did not assess possible changes in Med1 binding, activating chromatin marks, or eRNA production in the context of each enhancer knockout; they also state that findings cannot be extrapolated to all super-enhancers.
  • Stated: it remains possible that the apparently functionless elements have weak enhancer function not revealed by current physiological assays, or roles at different developmental stages or in defining enhancer polarity, which were not tested.
  • Evident: the study is restricted to the mouse α-globin locus in erythroid cells, and conclusions about super-enhancer generality rely on this single locus plus prior β-globin LCR work; the authors call for genetic dissection of other super-enhancers in other cell types.

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Integrity signals

Registry

Crossref · 10.1038/ng.3605

Cites

42 of 42 references verified0 citation errors · 0 not checkable

Statistics

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Verification

Claims the paper makes

7 of 11 cited sources checked · 4 supported · 0 flagged · accuracy not yet measured

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  • Probably not a substantial claim. 15
  • It may state two separate claims as one. 15
  • The quote only partly states this claim. 1
28 of 28
  • The paper relies on this without support.

    It is unlikely that cis-acting elements emerge fully formed during evolution or that they disappear entirely when they lose function.

    “It is unlikely that cis-acting elements emerge fully formed during evolution or that they disappear entirely when they lose function”
  • The paper relies on this without support.

    The residual loxP site and multiple cloning site footprint left by the recombination do not affect local gene expression.

    “This recombination leaves only a single residual loxP site and multiple cloning site footprint from the targeting vector.”
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Citations

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Research works printed but not linked: 1

  1. Russell, E.S. & Berstein, S.E. in Biology of the Laboratory Mouse 2nd edn. (ed. Green, E.L.) Chapter 17 (Dover Publications, 1966).

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Metadata

Authors
Hay, D., Hughes, J. R., Babbs, C., Davies, J. O. J., Graham, B. J., Hanssen, L. L. P., Kassouf, M. T., Oudelaar, A. M., Sharpe, J. A., Suciu, M. C., Telenius, J., Williams, R., Rode, C., Li, P.-S., Pennacchio, L. A., Sloane-Stanley, J. A., Ayyub, H., Butler, S., Sauka-Spengler, T., Gibbons, R. J., Smith, A. J. H., Wood, W. G., & Higgs, D. R.
Venue
Nature Genetics
Published
2016-07-04
Volume
48
Issue
8
Pages
895-903
ISSN
  • 1061-4036 (ISSN-L)
  • 1546-1718
OpenAlex
W2464000940
Cited by
385
References
42
Citations by year
2026: 20 · 2025: 37 · 2024: 36 · 2023: 36 · 2022: 44 · 2021: 46 · 2020: 40 · 2019: 28 · 2018: 41 · 2017: 41 · 2016: 16
FWCI
18.99
Type
journal article
Language
en
Open access
Locations
  • Nature Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • PubMed Central (submittedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • Research Explorer (The University of Manchester) (submittedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
  • U.S. Department of Energy (-AC02-05CH11231, 05CH11231, DE AC02 05CH11231, DE-AC02-)
  • Wellcome Trust (106130/Z/14/Z)
  • National Institute for Health and Care Research
  • National Institutes of Health (DE-AC02–05CH11231, R01-HG003988, U54 HG006997)
  • Medical Research Council (MC_PC_15069, MR/N00969X/1, DE-AC02-05CH11231)
  • Biomedical Research Council
  • National Human Genome Research Institute (DE-AC02-05CH11231, U54HG006997, R01-HG003988)
  • National Institute of Dental and Craniofacial Research (U01 DE020060, DE-AC02-05CH11231)
  • Lawrence Berkeley National Laboratory (AC02‐05CH11231, DE-AC02-05CH11231, U54HG006997, R01HG003988, 05CH11231)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Health Sciences › Medicine › Genetics (clinical) › Hemoglobinopathies and Related Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
Keywords
super-enhancers, enhancer deletion, erythroid cells, hematological phenotype, chromatin structure, chromosome conformation, Mediator complex, transcriptional regulation, gene expression
MeSH terms
Animals, Chromatin, Embryo, Mammalian, Enhancer Elements, Genetic, Gene Expression Regulation, Transcription Factors, Transcription, Genetic, Mice, Knockout, Erythroid Cells, Mice, alpha-Globins

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