Cited by 526Neuroinflammation and Neurodegeneration MechanismsNeurogenesis and neuroplasticity mechanismsMultiple Sclerosis Research Studies

A combination of ontogeny and CNS environment establishes microglial identity

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Bennett, F. Chris, Bennett, Mariko L., Yaqoob, Fazeela, Mulinyawe, Sara B., Grant, Gerald A., Hayden Gephart, Melanie, Plowey, Edward D., Barres, Ben A.·2018·Neuron

Abstract

Microglia, the brain's resident macrophages, are dynamic CNS custodians with surprising origins in the extra-embryonic yolk sac. The consequences of their distinct ontogeny are unknown but critical to understanding and treating brain diseases. We created a brain macrophage transplantation system to disentangle how environment and ontogeny specify microglial identity. We find that donor cells extensively engraft in the CNS of microglia-deficient mice, and even after exposure to a cell culture environment, microglia fully regain their identity when returned to the CNS. Though transplanted macrophages from multiple tissues can express microglial genes in the brain, only those of yolk-sac origin fully attain microglial identity. Transplanted macrophages of inappropriate origin, including primary human cells in a humanized host, express disease-associated genes and specific ontogeny markers. Through brain macrophage transplantation, we discover new principles of microglial identity that have broad applications to the study of disease and development of myeloid cell therapies.

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Crossref · 10.1016/j.neuron.2018.05.014

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  • Yolk-sac-derived microglia marker genes are highly enriched in microglia and are not upregulated in monocytes that engraft the brain in microglia-depleted mouse models.

    “These genes are highly enriched in microglia and are not upregulated in monocytes that engraft the brain in microglia-depleted mouse models”

    From Cross-Species Single-Cell Analysis Reveals Divergence of the Primate Microglia Program (2019) · cites this paper as Bennett et al., 2018

    The Results section on ontogeny markers reports that Gpr56 is expressed by yolk-sac-derived cells and microglia but not by engrafted HSC-lineage cells. However, the Results section on CNS-induced gene expression says engrafted cells of diverse origins express many other microglial signature genes at near-microglial levels. The claim is therefore supported for a specific ontogeny marker, not for microglial marker genes generally; page numbers are unavailable in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • When macrophages enter the CNS, they adopt a microglia-like phenotype and express markers considered to be microglia-specific, further confounding analysis.

    “In addition, when macrophages enter the CNS, they adopt a microglia-like phenotype and express markers considered to be microglia-specific, further confounding analysis (Bennett et al., 2018).”

    From Activated microglia drive demyelination via <scp>CSF1R</scp> signaling (2021) · cites this paper as Bennett et al., 2018

    The Results section (“HSC-MLCs express markers distinct from YS-MLCs and microglia”) reports that transplanted macrophages can express microglial signature genes and TMEM119 in the brain, complicating attempts to distinguish them from microglia. But it specifies that this occurred in the Csf1r−/− transplantation model and did not occur following conventional bone marrow transplantation. The claim omits that condition and presents the effect as general whenever macrophages enter the CNS. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Once microglia are impaired by irradiation or genetic deficiencies, HSC-derived macrophages can efficiently and persistently colonize the brain parenchyma.

    “Supporting this notion, once microglia are impaired by irradiation or genetic deficiencies, HSC-derived M F can efficiently and persistently colonize the brain parenchyma 14-17 .”

    From Clonal hematopoiesis-associated motoric deficits caused by monocyte-derived microglia accumulating in aging mice (2025) · cites this paper as [17]

    In Results (“Transplanted cells of diverse ontogeny engraft and ramify in the Csf1r−/− CNS”; page unavailable), the paper reports complete donor-cell coverage of the brain parenchyma by one month and stable occupancy for up to a year in genetically deficient mice. This supports efficient, persistent colonization in that setting. The reported experiment was irradiation-free, so this paper does not directly establish the irradiation part of the claim. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Experimentally seeded parenchymal brain monocyte-derived macrophages retain epigenomes and expression signatures distinct from YS-derived cells and respond differentially to challenges, even after prolonged brain residence.

    “Experimentally seeded parenchymal brain MoM F were shown to retain epigenomes and expression signatures distinct from YSderived cells and respond differentially to challenges, even following prolonged brain residence 14-17 .”

    From Clonal hematopoiesis-associated motoric deficits caused by monocyte-derived microglia accumulating in aging mice (2025) · cites this paper as [17]

    The Results sections on HSC ontogeny and distinct markers (page unavailable) show that engrafted HSC-derived macrophages retain gene-expression differences from YS-derived cells after months in the brain. Our copy does not establish distinct epigenomes or demonstrate that the engrafted populations respond differently when challenged; it only compares their expression profiles with gene sets associated with prior disease and LPS studies. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Recent transplantation experiments suggest that Ms4a7 and other Cluster 6 markers are specific to hematopoietic-derived cells rather than yolk-sac progenitors.

    “recent transplantation experiments suggest that Ms4a7 and other markers in Cluster 6 are specific to hematopoietic derived cells versus those derived from yolk-sac progenitors (Bennett et al., 2018).”

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Authors
Bennett, F. C., Bennett, M. L., Yaqoob, F., Mulinyawe, S. B., Grant, G. A., Hayden Gephart, M., Plowey, E. D., & Barres, B. A.
Affiliations
Stanford Medicine (US)
Corresponding author
Bennett, F. Chris
Venue
Neuron
Publisher
Elsevier BV
Published
2018-06
Volume
98
Issue
6
Pages
1170-1183.e8
ISSN
0896-6273 (ISSN-L)
OpenAlex
W2807609377
Cited by
524
References
59
Citations by year
2026: 44 · 2025: 59 · 2024: 47 · 2023: 67 · 2022: 73 · 2021: 77 · 2020: 75 · 2019: 57 · 2018: 24
FWCI
26.14
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • NIH (S10RR025518-01, NS069375, P50AG047366, R37DA01504317)
  • NRSA (F31 NS078813, T32MH019938-22, K08MH112120, K08NS901527, R01CA216054-01, K08 NS075144)
  • JPB Foundation
  • the Dr. Miriam and Sheldon G. Adelson Medical Research Foundation (853, 04-7023433)
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
microglia, microglial reprogramming, disease-associated microglia, humanized mice, microglial markers
MeSH terms
Animals, Brain, Central Nervous System, Hematopoietic Stem Cells, Humans, Macrophages, Receptors, Granulocyte-Macrophage Colony-Stimulating Factor, Microglia, Mice, Knockout, Cell Lineage, Mice

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