Cited by 36Genomics and Chromatin DynamicsNeurogenesis and neuroplasticity mechanismsEpigenetics and DNA Methylation

Postmitotic accumulation of histone variant H3.3 in new cortical neurons establishes neuronal chromatin, transcriptome, and identity

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Funk, Owen H., Qalieh, Yaman, Doyle, Daniel Z., Lam, Mandy M., Kwan, Kenneth Y.·2022·Proceedings of the National Academy of Sciences

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Abstract

Abstract Histone variants, which can be expressed outside of S-phase and deposited DNA synthesis-independently, provide long-term histone replacement in postmitotic cells, including neurons. Beyond replenishment, histone variants also play active roles in gene regulation by modulating chromatin states or enabling nucleosome turnover. Here, we uncover crucial roles for the histone H3 variant H3.3 in neuronal development. We find that newborn cortical excitatory neurons, which have only just completed replication-coupled deposition of canonical H3.1 and H3.2, substantially accumulate H3.3 immediately post mitosis. Co-deletion of H3.3-encoding genes H3f3a and H3f3b from newly postmitotic neurons abrogates H3.3 accumulation, markedly alters the histone posttranslational modification (PTM) landscape, and causes widespread disruptions to the establishment of the neuronal transcriptome. These changes coincide with developmental phenotypes in neuronal identities and axon projections. Thus, preexisting, replication-dependent histones are insufficient for establishing neuronal chromatin and transcriptome; de novo H3.3 is required. Stage-dependent deletion of H3f3a and H3f3b from (1) cycling neural progenitor cells, (2) neurons immediately post mitosis, or (3) several days later, reveals the first postmitotic days to be a critical window for de novo H3.3. After H3.3 accumulation within this developmental window, co-deletion of H3f3a and H3f3b does not lead to immediate H3.3 loss, but causes progressive H3.3 depletion over several months without widespread transcriptional disruptions or cellular phenotypes. Our study thus uncovers key developmental roles for de novo H3.3 in establishing neuronal chromatin, transcriptome, identity, and connectivity immediately post mitosis that are distinct from its role in maintaining total histone H3 levels over the neuronal lifespan. Significance DNA is packaged around histones into chromatin, which compacts the genome, but also restricts access to DNA. Gene transcription thus requires chromatin reorganization that is precisely regulated, including via variant forms of histones. Here, we find that during a critical developmental window for establishing postmitotic neuronal identity, newly generated cortical excitatory neurons substantially accumulate the histone H3 variant H3.3. Conditional deletion of H3.3-encoding genes from new neurons abrogates de novo H3.3 accumulation, and broadly disrupts neuronal histone modifications, gene expression, subtype identity, and axon projections. Thus, preexisting H3 histones are insufficient for establishing neuronal chromatin and transcriptome; de novo H3.3 is essential. This developmental requirement for H3.3 is distinct from H3.3 contribution to long-term maintenance of histones in mature neurons.

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Authors
Funk, O. H., Qalieh, Y., Doyle, D. Z., Lam, M. M., & Kwan, K. Y.
Affiliations
University of Michigan (US)
Corresponding author
Kwan, Kenneth Y.
Venue
Proceedings of the National Academy of Sciences
Published
2022-08-05
Volume
119
Issue
32
Pages
e2116956119-e2116956119
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W4291708389
Cited by
33
References
83
Citations by year
2026: 12 · 2025: 5 · 2024: 8 · 2023: 8
FWCI
1.71
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion, cc-by-nc-nd)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • HHS | NIH | National Institute of Neurological Disorders and Stroke (R01 NS097525, F31 NS110206)
  • HHS | NIH | National Institute of General Medical Sciences (T32 GM007544)
  • Brain Research Foundation (BRFSG-2016-04)
  • March of Dimes Foundation (5-FY15-33)
  • Simons Foundation (402213)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
histone H3.3, histone variants, postmitotic neurons, cortical excitatory neurons, neuronal development, neuronal identity, neuronal transcriptome, H3F3A, H3F3B, histone modifications, axonal projections, neural progenitor cells
MeSH terms
Animals, Cerebral Cortex, Chromatin, Histones, Mitosis, Neurons, Nucleosomes, Mice, Neurogenesis, Transcriptome

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