Table 2.

Effects of post-ovulatory ageing of oocytes on epigenetic modifications.

Species	Epigenetic changes	References
Mouse	DNA methylation patterns of Snrpn and Peg1 in oocytes is altered at 29 h after hCG injection	Liang et al. (2008)
Mouse	Peg1 loss of methylation in oocytes during post-ovulatory ageing	Imamura et al. (2005)
Mouse	Acetylation of H4K8, H4K12 and H3K14 is altered in ageing oocytes	Huang et al. (2007) and Liu et al. (2009b)
Porcine	Histone of H4K12 is changed in post-ovulatory ageing oocytes	Cui et al. (2011)