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Updated: Jan 19, 2026
Meiotic Spindle Assessment in Mouse Oocytes by siRNA-mediated Silencing
Published on: October 11, 2015
Loss of HDAC3 contributes to meiotic defects in aged oocytes
Yongfu He1, Xiaoyan Li1, Min Gao1
1College of Animal Science & Technology, Nanjing Agricultural University, Nanjing, China.
Abstract:
Maternal age-related decline in oocyte quality is associated with meiotic defects, but the underlying mechanisms remain to be explored. Histone deacetylase 3 (HDAC3) has been shown to govern multiple cellular events via deacetylating diverse substrates. We previously found that HDAC3 could promote meiotic apparatus assembly in mouse oocytes. In the present study, we identified a substantial reduction in HDAC3 protein in oocytes from old mice. Importantly, overexpression of HDAC3 in old oocytes not only partially prevents spindle/chromosome disorganization, but also significantly lowers the incidence of aneuploidy. Meanwhile, we noticed the elevated acetylation level of α-tubulin in oocytes derived from old mice. By employing site-directed mutagenesis, we showed that acetylation-mimetic mutant tubulin-K40Q disrupts the kinetochore-microtubule attachments and results in the assembly failure of meiotic apparatus in mouse oocytes. Importantly, forced expression of tubulin-K40R (nonacetylatable-mimetic mutant) was capable of alleviating the defective phenotypes of oocytes from aged mice. To sum up, this study uncovers that loss of HDAC3 represents one potential mechanism mediating the effects of advanced maternal age on oocyte quality.
Insights
Loss of Histone deacetylase 3 (HDAC3) in aging mouse oocytes contributes to meiotic errors and reduced egg quality. Restoring HDAC3 levels can partially correct these age-related defects.
Area of Science:
- Reproductive biology
- Molecular genetics
- Cell biology
Background:
- Maternal aging is linked to decreased oocyte quality and increased meiotic abnormalities.
- Histone deacetylase 3 (HDAC3) plays a role in cellular events, including meiotic apparatus assembly in oocytes.
- The specific molecular mechanisms underlying age-related oocyte quality decline require further investigation.
Purpose of the Study:
- To investigate the role of Histone deacetylase 3 (HDAC3) in maternal age-related oocyte quality decline.
- To explore the impact of HDAC3 reduction and α-tubulin acetylation on meiotic apparatus assembly and aneuploidy in aged oocytes.
- To determine if manipulating HDAC3 levels or tubulin acetylation can ameliorate age-associated oocyte defects.
Main Methods:
- Quantitative assessment of HDAC3 protein levels in oocytes from young and old mice.
- Overexpression of HDAC3 in oocytes from old mice.
- Site-directed mutagenesis of α-tubulin (K40Q and K40R mutants) to mimic or prevent acetylation.
- Analysis of spindle/chromosome organization, kinetochore-microtubule attachments, and aneuploidy rates.
Main Results:
- HDAC3 protein levels are significantly reduced in oocytes from aged mice.
- Overexpression of HDAC3 in aged oocytes partially restored spindle/chromosome organization and reduced aneuploidy.
- Increased α-tubulin acetylation (specifically at K40) was observed in aged oocytes.
- Acetylation-mimetic tubulin mutation (K40Q) disrupted meiotic apparatus assembly, while the non-acetylatable mutant (K40R) alleviated age-related defects.
Conclusions:
- Reduced HDAC3 expression is a potential mechanism contributing to age-related decline in oocyte quality.
- Aberrant α-tubulin acetylation, particularly at K40, plays a critical role in disrupting meiotic apparatus assembly and causing aneuploidy in aged oocytes.
- Targeting HDAC3 or modulating tubulin acetylation may offer strategies to improve oocyte quality in aging females.
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