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Published on: September 7, 2017
Densely ionizing radiation affects DNA methylation of selective LINE-1 elements
Sara Prior1, Isabelle R Miousse1, Etienne Nzabarushimana2
1Department of Environmental and Occupational Health, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR 72205, USA.
DNA methylation regulates Long Interspersed Nucleotide Element 1 (LINE-1) retrotransposons. Densely ionizing radiation (IR) alters LINE-1 methylation and expression, with histone modifications playing a key role in response to dense IR.
Area of Science:
- Genomics
- Epigenetics
- Radiation Biology
Background:
- Long Interspersed Nucleotide Element 1 (LINE-1) retrotransposons are abundant in mammalian genomes and are epigenetically silenced by DNA methylation.
- LINE-1 methylation patterns can vary based on element age and are influenced by environmental factors.
Purpose of the Study:
- To investigate differential DNA methylation of LINE-1 elements under normal conditions and following exposure to sparsely and densely ionizing radiation (IR).
- To explore the role of DNA methylation and histone modifications in regulating LINE-1 expression in response to IR.
Main Methods:
- Analysis of LINE-1 DNA methylation in mouse lung tissue.
- Treatment with 5-aza-2'-deoxycytidine and a methionine-deficient diet.
- Assessment of LINE-1 mRNA and protein levels.
- Chromatin immunoprecipitation to examine histone modifications (H3K9me2, H3K4me3) at LINE-1 regions.
Main Results:
- LINE-1 DNA methylation is dependent on evolutionary age, with older elements showing lower methylation.
- Densely ionizing radiation (IR) induced hypermethylation of older LINE-1 elements, while younger elements were unaffected.
- Densely IR increased LINE-1 expression through histone modifications (decreased H3K9me2, increased H3K4me3) independently of DNA methylation changes.
Conclusions:
- DNA methylation is crucial for LINE-1 regulation in normal conditions.
- Histone modifications are key regulators of LINE-1 transcriptional activity following exposure to densely ionizing radiation.
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