Implantation failure and genetic developmental disabilities in mammals are caused by errors in chromosome segregation originating mainly in the oocyte during meiosis I. Some conditions, like maternal ageing or in vitro maturation (IVM), increase the incidence of oocyte aneuploidy. Here oocytes from adult mares were used to investigate oocyte maturation in a monovulatory species. Experiments were conducted to compare: (1) the incidence of aneuploidy, (2) the morphology of the spindle, (3) the acetylation of lysine 16 on histone H4 (H4K16) and (4) the relative amount of histone acetyltransferase 1 (HAT1), K(lysine) acetyltransferase 8 (KAT8, also known as MYST1), histone deacetylase 1 (HDAC1) and NAD-dependent protein deacetylase sirtuin 1 (SIRT1) mRNA in metaphase II stage oocytes that were in vitro matured or collected from peri-ovulatory follicles. The frequency of aneuploidy and anomalies in spindle morphology was increased following IVM, along with a decrease in H4K16 acetylation that was in agreement with our previous observations. However, differences in the amount of the transcripts investigated were not detected. These results suggest that the degradation of transcripts encoding for histone deacetylases and acetyltransferases is not involved in the changes of H4K16 acetylation observed following IVM, while translational or post-translational mechanisms might have a role. Our study also suggests that epigenetic instabilities introduced by IVM may affect the oocyte and embryo genetic stability.
In vitro maturation affects chromosome segregation, spindle morphology and acetylation of lysine 16 on histone H4 in horse oocytes / F. Franciosi, G. Goudet, I. Tessaro, P. Papillier, R. Dalbies-Tran, F. Reigner, S. Deleuze, C. Douet, I. Miclea, V. Lodde, A.M. Luciano. - In: REPRODUCTION FERTILITY AND DEVELOPMENT. - ISSN 1031-3613. - 29:4(2017 Apr 01), pp. 721-730.
|Titolo:||In vitro maturation affects chromosome segregation, spindle morphology and acetylation of lysine 16 on histone H4 in horse oocytes|
|Parole Chiave:||aneuploidy; histone acetyl-transferases; histone deacetylases; meiosis|
|Settore Scientifico Disciplinare:||Settore VET/01 - Anatomia degli Animali Domestici|
Settore VET/02 - Fisiologia Veterinaria
Settore VET/10 - Clinica Ostetrica e Ginecologia Veterinaria
|Data di pubblicazione:||1-apr-2017|
|Data ahead of print / Data di stampa:||2015|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1071/RD15350|
|Appare nelle tipologie:||01 - Articolo su periodico|