In modern times, a notable trend toward delayed childbearing has been observed in most developed countries. As a result, sperm aging and quality loss, as well as premature ovarian failure (POF), have emerged as major causes of infertility. The pathogenesis of sperm aging and POF is complex and has not been clearly elucidated. However, evidence from some studies has linked germ cell aging to epigenetic modifications. Epigenetics refers to the heritable changes in gene expression that occur in the absence of any alterations to the gene's nucleotide sequence. This paper systematically reviewed and analyzed the relevant literature to describe the relationship of DNA methylation, non-coding RNA regulation, histone modifications, chromatin remodeling, and RNA modifications with sperm aging and POF. In addition, we analyzed how sperm aging and POF can be mitigated via epigenetic interventions. This review could provide new therapeutic insights and guide strategies for improving sperm quality and ovarian function.
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http://dx.doi.org/10.14336/AD.2024.0126 | DOI Listing |
Commun Biol
December 2024
The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, 1088639, Japan.
One of the major age-related declines in female reproductive function is the reduced quantity and quality of oocytes. Here we demonstrate that structural changes in the zona pellucida (ZP) were associated with decreased fertilization rates from 34- to 38-week-old female mice, equivalent to the mid-reproductive of human females. In middle-aged mouse ovaries, the decline in the number of transzonal projections was accompanied by a decrease in cumulus cell-oocyte interactions, resulting in a deterioration of the oocyte quality.
View Article and Find Full Text PDFPLoS One
December 2024
Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Tokyo, Japan.
The investment of males in reproductive traits is often associated with their age. For example, several empirical and theoretical studies have demonstrated that older males make greater investment in reproduction compared with younger males. However, with regards to post-copulatory sexual selection, male reproductive success might be influenced by decreasing sperm quality with male age and the interaction between aging and mating experience in males.
View Article and Find Full Text PDFPoult Sci
December 2024
Animal Science and Technology College, Beijing University of Agriculture, Beijing 102206, PR China; Key Laboratory of Agricultural Product Processing and Quality Control (Co-construction by Ministry and Province), Ministry of Agriculture and Rural Affairs, PR China. Electronic address:
This study investigated the effects of dietary lycopene supplementation on semen quality, testicular histology, antioxidant capacity, and reproductive hormone levels in aging breeder roosters. A total of 96 roosters were randomly divided into four groups and supplemented with 0, 50, 100, and 200 mg/kg of lycopene for six weeks. Lycopene significantly improved semen volume, sperm concentration, motility, viability, and morphological parameters at all doses (P < 0.
View Article and Find Full Text PDFHum Reprod Open
November 2024
Department of Urology, Peking University Third Hospital, Beijing, China.
Study Question: Which independent factors influence ICSI outcomes in patients with complete azoospermia factor c (AZFc) microdeletions?
Summary Answer: In patients with complete AZFc microdeletions, the sperm source, male LH, the type of infertility in women, and maternal age are the independent factors associated with ICSI outcomes.
What Is Known Already: AZF microdeletions are the second most prevalent factor contributing to infertility in men, with AZFc microdeletions being the most frequently affected locus, accounting for 60-70% of all cases. The primary clinical phenotypes are oligoasthenozoospermia and azoospermia in patients with complete AZFc microdeletions.
BMC Med
December 2024
Centre for Fertility and Health, Norwegian Institute of Public Health, Skøyen, PO Box 222, 0213, Oslo, Norway.
Background: Telomere length (TL) has been reported to be associated with conditions such as endometriosis and polycystic ovary syndrome, with some studies finding associations with shorter TL and others with longer TL. In men, studies mostly report associations between shorter TL and sperm quality. To our knowledge, no studies have thus far investigated associations between TL and fecundability or the use of assisted reproductive technologies (ART).
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