Age-associated sperm DNA methylation patterns do not directly persist trans-generationally.
Timothy G Jenkins1,2,3, Emma R James4,5, Kenneth I Aston4,6
1Department of Physiology and Developmental Biology, Brigham Young University Provo, Life Sciences Building 4005, Provo, UT, 84602, USA. tim_jenkins@byu.edu.
Epigenetics & Chromatin
|December 21, 2019
Summary
Sperm DNA methylation changes due to paternal age are not directly passed to offspring. Epigenetic reprogramming appears to reset these marks, preventing transgenerational inheritance of age-related methylation patterns.
Area of Science:
- Epigenetics
- Reproductive Biology
- Genetics
Background:
- Aging significantly impacts the sperm methylome, but its direct transgenerational effects on offspring remain unclear.
- Understanding the inheritance of sperm DNA methylation alterations is crucial for reproductive health.
- The established link between aging and sperm DNA methylation offers a model to study transgenerational epigenetic inheritance.
Purpose of the Study:
- To investigate whether age-related DNA methylation alterations in sperm are transmitted across generations.
- To compare DNA methylation patterns in sperm from individuals with older versus younger paternal grandfathers.
- To determine the role of epigenetic reprogramming in resetting sperm methylation patterns.
Main Methods:
- Utilized the Illumina MethylationEPIC array for sperm DNA methylation analysis.
- Compared 16 patients with older paternal grandfathers (OGPA) against 16 with younger grandfathers (YGPA) from the SHARE cohort.
- Analyzed specific age-associated methylation sites and differentially methylated regions.
Main Results:
- No significant differences in DNA methylation were found between OGPA and YGPA groups.
- Targeted analysis of age-altered sites also revealed no statistically significant differences.
- A minor, non-significant trend towards lower methylation in OGPA individuals mirrored age-related patterns.
Conclusions:
- Age-associated sperm DNA methylation changes are likely reset during epigenetic reprogramming.
- Direct transgenerational inheritance of these methylation patterns over two generations was not supported.
- Observed trends were too small to be biologically significant, suggesting limited impact on offspring.
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