Intrinsic and extrinsic molecular determinants or modulators for epigenetic remodeling and reprogramming of somatic cell-derived genome in mammalian nuclear-transferred oocytes and resultant embryos.

The efficiency of somatic cell cloning in mammals remains disappointingly low. Incomplete and aberrant reprogramming of epigenetic memory of somatic cell nuclei in preimplantation nuclear- transferred (NT) embryos is one of the most important factors that limit the cloning effectiveness. The extent of epigenetic genome-wide alterations, involving histone or DNA methylation and histone deacetylation, that are mediated by histone-lysine methyltransferases (HMTs) or DNA methyltransferases (DNMTs) and histone deacetylases (HDACs) can be modulated/reversed via exogenous inhibitors of these enzymes throughout in vitro culture of nuclear donor cells, nuclear recipient oocytes and/or cloned embryos. The use of the artificial modifiers of epigenomically-conditioned gene expression leads to inhibition of both chromatin condensation and transcriptional silencing the genomic DNA of somatic cells that provide a source of nuclear donors for reconstruction of enucleated oocytes and generation of cloned embryos. The onset of chromatin decondensation and gene transcriptional activity is evoked both through specific/selective inactivating HMTs by BIX-01294 and through non-specific/non-selective blocking the activity of either DNMTs by 5-aza-2'-deoxycytidine, zebularine, S-adenosylhomocysteine or HDACs by trichostatin A, valproic acid, scriptaid, oxamflatin, sodium butyrate, m-carboxycinnamic acid bishydroxamide, panobinostat, abexinostat, quisinostat, dacinostat, belinostat and psammaplin A. Epigenomic modulation of nuclear donor cells, nuclear recipient cells and/or cloned embryos may facilitate and accelerate the reprogrammability for gene expression of donor cell nuclei that have been transplanted into a host ooplasm and subsequently underwent dedifferentiating and re-establishing the epigenetically dependent status of their transcriptional activity during pre- and postimplantation development of NT embryos. Nevertheless, a comprehensive additional work is necessary to determine whether failures in the early-stage reprogramming of somatic cell-inherited genome are magnified downstream in development of cloned conceptuses and neonates.

• Publication year

  2018

• Venue

  Polish journal of veterinary sciences

• Publication date

  2018-03-01

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.24425/119040PMID 29624006
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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