Cited by 43Genetics, Aging, and Longevity in Model OrganismsTelomeres, Telomerase, and SenescenceGenomics and Chromatin Dynamics

Early‐onset aging and mitochondrial defects associated with loss of histone acetyltransferase 1 (Hat1)

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Nagarajan, Prabakaran, Agudelo Garcia, Paula A., Iyer, Chitra C., Popova, Liudmila V., Arnold, William D., Parthun, Mark R.·2019·Aging Cell

Abstract

Histone acetyltransferase 1 (Hat1) is responsible for the acetylation of newly synthesized histone H4 on lysines 5 and 12 during the process of chromatin assembly. To understand the broader biological role of Hat1, we have generated a conditional mouse knockout model of this enzyme. We previously reported that Hat1 is required for viability and important for mammalian development and genome stability. In this study, we show that haploinsufficiency of Hat1 results in a significant decrease in lifespan. Defects observed in Hat1+/− mice are consistent with an early‐onset aging phenotype. These include lordokyphosis (hunchback), muscle atrophy, minor growth retardation, reduced subcutaneous fat, cancer, and paralysis. In addition, the expression of Hat1 is linked to the normal aging process as Hat1 mRNA and protein becomes undetectable in many tissues in old mice. At the cellular level, fibroblasts from Hat1 haploinsufficient embryos undergo early senescence and accumulate high levels of p21. Hat1+/− mouse embryonic fibroblasts (MEFs) display modest increases in endogenous DNA damage but have significantly higher levels of reactive oxygen species (ROS). Consistently, further studies show that Hat1−/− MEFs exhibit mitochondrial defects suggesting a critical role for Hat1 in mitochondrial function. Taken together, these data show that loss of Hat1 induces multiple hallmarks of early‐onset aging.

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  • HAT1 is a cytoplasmic histone deacetylase whose loss is associated with early onset ageing and mitochondrial defects, and whose expression is reduced under treatment with hypoxic agents.

    “HAT1 (FC = −1.12, p = 0.05) is a cytoplasmic histone deacetylase, for which loss is associated with early onset ageing and mitochondrial defects [105], and for which expression is reduced under treatment with hypoxic agents [159].”

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Authors
Nagarajan, P., Agudelo Garcia, P. A., Iyer, C. C., Popova, L. V., Arnold, W. D., & Parthun, M. R.
Affiliations
  • The Ohio State University (US)
  • Department of Biological Chemistry and Pharmacology, The Ohio State University Columbus Ohio
Corresponding author
Parthun, Mark R.
Venue
Aging Cell
Publisher
Wiley
Published
2019-07-10
Volume
18
Issue
5
Pages
e12992-e12992
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2961798823
Cited by
43
References
67
Citations by year
2026: 6 · 2025: 6 · 2024: 9 · 2023: 7 · 2022: 3 · 2021: 8 · 2020: 4
FWCI
1.36
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
National Institutes of Health (GM062970)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
HAT1, haploinsufficiency, lifespan reduction, histone H4 acetylation, chromatin assembly, mitochondrial defects, cellular senescence, p21, reactive oxygen species, DNA damage, mouse knockout models, muscle atrophy
MeSH terms
Aging, Animals, Mice, Inbred C57BL, Mitochondria, Mice, Knockout, Mice, Histone Acetyltransferases

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