PreprintCited by 219Epigenetics and DNA MethylationHematopoietic Stem Cell TransplantationGenomics and Chromatin Dynamics

Functional antagonism of the polycomb-group genes eed and Bmi1 in hemopoietic cell proliferation

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Lessard, J., Schumacher, A., Thorsteinsdottir, U., van Lohuizen, M., Magnuson, T., Sauvageau, G.·1999·Genes & Development

Abstract

The murine Polycomb-Group (PcG) proteins Eed and Bmi1 govern axial patterning during embryonic development by segment-specific repression of Hox gene expression. The two proteins engage in distinct multimeric complexes that are thought to use a common molecular mechanism to render the regulatory regions of Hox and other downstream target genes inaccessible to transcriptional activators. Beyond axial patterning, Bmi1 is also involved in hemopoiesis because a loss-of-function allele causes a profound decrease in bone marrow progenitor cells. Here, evidence is presented that is consistent with an antagonistic function of eed and Bmi1 in hemopoietic cell proliferation. Heterozygosity for an eed null allele causes marked myelo- and lymphoproliferative defects, indicating that eed is involved in the negative regulation of the pool size of lymphoid and myeloid progenitor cells. This antiproliferative function of eed does not appear to be mediated by Hox genes or the tumor suppressor locus p16(INK4a)/p19(ARF) because expression of these genes was not altered in eed mutants. Intercross experiments between eed and Bmi1 mutant mice revealed that Bmi1 is epistatic to eed in the control of primitive bone marrow cell proliferation. However, the genetic interaction between the two genes is cell-type specific as the presence of one or two mutant alleles of eed trans-complements the Bmi1-deficiency in pre-B bone marrow cells. These studies thus suggest that hemopoietic cell proliferation is regulated by the relative contribution of repressive (Eed-containing) and enhancing (Bmi1-containing) PcG gene complexes.

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  • Disturbing many epigenetic writers or erasers severely impairs HSC function.

    “perturbation of a large number of epigenetic writers or erasers severely affects HSC function.”

    From Aging of hematopoietic stem cells (2018) · cites this paper as [66]

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Authors
Lessard, J., Schumacher, A., Thorsteinsdottir, U., van Lohuizen, M., Magnuson, T., & Sauvageau, G.
Affiliations
Baylor College of Medicine (US)
Venue
Genes & Development
Published
1999-10-15
Volume
13
Issue
20
Pages
2691-2703
ISSN
0890-9369 (ISSN-L)
OpenAlex
W2159108509
Cited by
219
References
40
Citations by year
2025: 2 · 2023: 3 · 2022: 7 · 2021: 1 · 2020: 4 · 2019: 3 · 2018: 2 · 2017: 4 · 2016: 11 · 2015: 8 · 2014: 5 · 2013: 13 · 2012: 17
Type
posted content
Language
en
Open access
Locations
  • Genes & Development (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • Medical Research Council
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37HD024462, HD-24462, R01HD024462)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Health Sciences › Medicine › Hematology › Hematopoietic Stem Cell Transplantation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
Polycomb group proteins, EED, BMI1, hematopoiesis, bone marrow progenitor cells, epistasis, trans-complementation, axial patterning, pre-B cells
MeSH terms
Aging, Animals, Cell Division, Colony-Forming Units Assay, Female, Genes, Homeobox, Genes, Regulator, Hematopoiesis, Hematopoietic Stem Cells, Male, Mice, Inbred C3H, Nuclear Proteins, Proto-Oncogene Proteins, Repressor Proteins, Mice, Knockout, Gene Expression Regulation, Developmental, Genes, p16, Mice, Polycomb-Group Proteins, Polycomb Repressive Complex 1, Polycomb Repressive Complex 2

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