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A germ cell-specific ageing pattern in otherwise healthy men.
Sandra Laurentino1, Jann-Frederik Cremers1, Bernhard Horsthemke2
1Centre of Reproductive Medicine and Andrology, University of Münster, Münster, Germany.
Aging Cell
|September 20, 2020
Summary
Male germ cells age uniquely, with increasing sperm DNA instability and altered methylation patterns after age 60. This age-related decline in sperm quality may impact male fertility and offspring health.
Area of Science:
- Reproductive Biology
- Aging Research
- Genetics
Background:
- Paternal age is linked to fertility issues and offspring health problems.
- Accumulated germ cell mutations contribute to congenital diseases.
- Molecular aging patterns in male germ cells and DNA integrity require further study.
Purpose of the Study:
- To investigate the effects of 'pure' aging on male reproductive health.
- To evaluate changes in germ cell quality with increasing paternal age.
- To analyze sperm DNA integrity and methylation patterns in relation to age.
Main Methods:
- Recruited 198 healthy men aged 18-84 years.
- Assessed semen profiles, hormone levels, sexual health, and sperm DNA parameters.
- Utilized in silico analysis for DNA methylation regions.
Main Results:
- Sperm production and hormone profiles remained stable across six decades.
- Identified increased sperm telomere length and significant sperm DNA instability after age 60.
- Detected age-related DNA methylation changes in 236 regions, some potentially escaping post-fertilization demethylation.
Conclusions:
- Human male germ cells exhibit a distinct aging process.
- This germline-specific aging may reduce fecundity in older men.
- Paternal germ cell aging could negatively affect offspring health prognosis.
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