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Alioui, Anthony; Wheldon, Lee M.; Abakir, Abdulkadir; Ferjentsik, Zoltan; Johnson, Andrew D.; Ruzov, Alexey (2012)
Publisher: Landes Bioscience
Journal: Nucleus
Languages: English
Types: Article
Subjects: DNA methylation, 5-carboxylcytosine, active demethylation, 5-hydroxymethylcytosine, Research Paper, epigenetics
5-Methylcytosine (5-mC) is an epigenetic modification associated with gene repression. Recent studies demonstrated that 5-mC can be enzymatically oxidised into 5-hydroxymethylcytosine and further into 5-formylcytosine (5-fC) and 5-carboxylcytsine (5-caC). 5-caC has been found in embryonic stem cells and in mouse pre-implantation embryos but no detectable levels of this modification have been reported for somatic tissues to date. Whereas it has been suggested that 5-caC can serve as an intermediate in the process of active demethylation, the function of this form of modified cytosine remains obscure. Here we show that 5-caC is immunochemically detectable in somatic cells of axolotl ovary. We demonstrate that both 5-hmC and 5-caC are localized to the euchromatin in the nuclei of axolotl follicular cells with similar patterns of spatial distribution. Our results suggest that 5-carboxylcytosine may play a distinct functional role in certain biological contexts.

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