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Profiling of m6A RNA modifications identified an age‐associated regulation of AGO 2 mRNA stability

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Min, Kyung‐Won, Zealy, Richard W., Davila, Sylvia, Fomin, Mikhail, Cummings, James C., Makowsky, Daniel, Mcdowell, Catherine H., Thigpen, Haley +5 more·2018·Aging Cell

Abstract

Gene expression is dynamically regulated in a variety of mammalian physiologies. During mammalian aging, there are changes that occur in protein expression that are highly controlled by the regulatory steps in transcription, post-transcription, and post-translation. Although there are global profiles of human transcripts during the aging processes available, the mechanism(s) by which transcripts are differentially expressed between young and old cohorts remains unclear. Here, we report on N6-methyladenosine (m6A) RNA modification profiles of human peripheral blood mononuclear cells (PBMCs) from young and old cohorts. An m6A RNA profile identified a decrease in overall RNA methylation during the aging process as well as the predominant modification on proteincoding mRNAs. The m6A-modified transcripts tend to be more highly expressed than nonmodified ones. Among the many methylated mRNAs, those of DROSHA and AGO2 were heavily methylated in young PBMCs which coincided with a decreased steady-state level of AGO2 mRNA in the old PBMC cohort. Similarly, downregulation of AGO2 in proliferating human diploid fibroblasts (HDFs) also correlated with a decrease in AGO2 mRNA modifications and steady-state levels. In addition, the overexpression of RNA methyltransferases stabilized AGO2 mRNA but not DROSHA and DICER1 mRNA in HDFs. Moreover, the abundance of miRNAs also changed in the young and old PBMCs which are possibly due to a correlation with AGO2 expression as observed in AGO2-depleted HDFs. Taken together, we uncovered the role of mRNA methylation on the abundance of AGO2 mRNA resulting in the repression of miRNA expression during the process of human aging.

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Authors
Min, K., Zealy, R. W., Davila, S., Fomin, M., Cummings, J. C., Makowsky, D., Mcdowell, C. H., Thigpen, H., Hafner, M., Kwon, S., Georgescu, C., Wren, J. D., & Yoon, J.
Affiliations
  • Medical University of South Carolina (US)
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (US)
  • Oklahoma Medical Research Foundation (US)
  • National Institutes of Health (US)
Corresponding author
  • Wren, Jonathan D.
  • Yoon, Je‐Hyun
Venue
Aging Cell
Publisher
Wiley
Published
2018-03-23
Volume
17
Issue
3
Pages
e12753-e12753
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2790089633
Cited by
131
References
39
Citations by year
2026: 7 · 2025: 17 · 2024: 12 · 2023: 20 · 2022: 29 · 2021: 17 · 2020: 18 · 2019: 9 · 2018: 2
FWCI
4.09
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Medical University of South Carolina
  • National Institute on Aging
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (P30AG050911)
  • American Society of Nephrology
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA modifications and cancer
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA regulation and disease
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA Research and Splicing
Keywords
N6-methyladenosine, m6A RNA methylation, aging, Argonaute 2, mRNA stability, Drosha, DICER1, RNA methyltransferase, microRNA expression, peripheral blood mononuclear cells, human diploid fibroblasts, post-transcriptional regulation
MeSH terms
Adult, Aging, Cells, Cultured, Humans, Male, Methylation, Methyltransferases, Middle Aged, RNA, Down-Regulation, Gene Expression, RNA Stability, Argonaute Proteins

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