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5‐Formylcytosine Could Be a Semipermanent Base in Specific Genome Sites
Author(s) -
Su Meng,
Kirchner Angie,
Stazzoni Samuele,
Müller Markus,
Wagner Mirko,
Schröder Arne,
Carell Thomas
Publication year - 2016
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201605994
Subject(s) - base (topology) , mathematics , mathematical analysis
5‐Formyl‐2′‐deoxycytosine (fdC) is a recently discovered epigenetic base in the genome of stem cells, with yet unknown functions. Sequencing data show that the base is enriched in CpG islands of promoters and hence likely involved in the regulation of transcription during cellular differentiation. fdC is known to be recognized and excised by the enzyme thymine‐DNA‐glycosylase (Tdg). As such, fdC is believed to function as an intermediate during active demethylation. In order to understand the function of the new epigenetic base fdC, it is important to analyze its formation and removal at defined genomic sites. Here, we report a new method that combines sequence‐specific chemical derivatization of fdC with droplet digital PCR that enables such analysis. We show initial data, indicating that the repair protein Tdg removes only 50 % of the fdCs at a given genomic site, arguing that fdC is a semipermanent base.

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