Cited by 238Chromosomal and Genetic VariationsTelomeres, Telomerase, and SenescenceDNA Repair Mechanisms

Somatic expression of LINE-1 elements in human tissues

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Belancio, Victoria P., Roy-Engel, Astrid M., Pochampally, Radhika R., Deininger, Prescott·2010·Nucleic Acids Research

Abstract

LINE-1 expression damages host DNA via insertions and endonuclease-dependent DNA double-strand breaks (DSBs) that are highly toxic and mutagenic. The predominant tissue of LINE-1 expression has been considered to be the germ line. We show that both full-length and processed L1 transcripts are widespread in human somatic tissues and transformed cells, with significant variation in both L1 expression and L1 mRNA processing. This is the first demonstration that RNA processing is a major regulator of L1 activity. Many tissues also produce translatable spliced transcript (SpORF2). An Alu retrotransposition assay, COMET assays and 53BP1 foci staining show that the SpORF2 product can support functional ORF2 protein expression and can induce DNA damage in normal cells. Tests of the senescence-associated beta-galactosidase expression suggest that expression of exogenous full-length L1, or the SpORF2 mRNA alone in human fibroblasts and adult stem cells triggers a senescence-like phenotype, which is one of the reported responses to DNA damage. In contrast to previous assumptions that L1 expression is germ line specific, the increased spectrum of tissues exposed to L1-associated damage suggests a role for L1 as an endogenous mutagen in somatic tissues. These findings have potential consequences for the whole organism in the form of cancer and mammalian aging.

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  1. [18]Shi X Seluanov A Gorbunova V Cell divisions are required for L1 retrotransposition Mol. Cell Biol. 2007 27 1264 1270 17145770 PMC1800731

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Authors
Belancio, V. P., Roy-Engel, A. M., Pochampally, R. R., & Deininger, P.
Affiliations
Tulane University (US)
Corresponding author
Deininger, Prescott
Venue
Nucleic Acids Research
Published
2010-03-09
Volume
38
Issue
12
Pages
3909-3922
ISSN
  • 0305-1048 (ISSN-L)
  • 1362-4962
OpenAlex
W2055705164
Cited by
238
References
69
Citations by year
2026: 6 · 2025: 11 · 2024: 13 · 2023: 9 · 2022: 23 · 2021: 12 · 2020: 13 · 2019: 12 · 2018: 14 · 2017: 13 · 2016: 21 · 2015: 23 · 2014: 15 · 2013: 18 · 2012: 14
FWCI
19.95
Type
journal article
Language
en
Open access
Locations
  • Nucleic Acids Research (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • National Science Foundation (0346411)
  • Ellison Medical Foundation
  • Louisiana Board of Regents
  • Tulane University
  • National Institutes of Health
  • National Institute on Aging (K01AG030074)
  • National Institute of General Medical Sciences (R01GM45668, R01GM079709, R01GM045668)
  • National Center for Research Resources (P20RR020152)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Health Sciences › Medicine › Physiology › Telomeres, Telomerase, and Senescence
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
LINE-1 retrotransposons, ORF2 protein, retrotransposition, DNA double-strand breaks, DNA damage, cellular senescence, endogenous mutagenesis, 53BP1 foci, transformed cells, adult stem cells, cancer, aging
MeSH terms
Adult, Animals, Cell Line, DNA Damage, Endonucleases, Fibroblasts, Humans, RNA-Directed DNA Polymerase, RNA Splicing, RNA, Messenger, Stem Cells, Cellular Senescence, Long Interspersed Nucleotide Elements, Alu Elements, Polyadenylation, Mice

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