2002-35-9Relevant articles and documents
Quantitative LC–MS Provides No Evidence for m6dA or m4dC in the Genome of Mouse Embryonic Stem Cells and Tissues
Schiffers, Sarah,Ebert, Charlotte,Rahimoff, René,Kosmatchev, Olesea,Steinbacher, Jessica,Bohne, Alexandra-Viola,Spada, Fabio,Michalakis, Stylianos,Nickelsen, J?rg,Müller, Markus,Carell, Thomas
, p. 11268 - 11271 (2017)
Until recently, it was believed that the genomes of higher organisms contain, in addition to the four canonical DNA bases, only 5-methyl-dC (m5dC) as a modified base to control epigenetic processes. In recent years, this view has changed dramatically with the discovery of 5-hydroxymethyl-dC (hmdC), 5-formyl-dC (fdC), and 5-carboxy-dC (cadC) in DNA from stem cells and brain tissue. N6-methyldeoxyadenosine (m6dA) is the most recent base reported to be present in the genome of various eukaryotic organisms. This base, together with N4-methyldeoxycytidine (m4dC), was first reported to be a component of bacterial genomes. In this work, we investigated the levels and distribution of these potentially epigenetically relevant DNA bases by using a novel ultrasensitive UHPLC–MS method. We further report quantitative data for m5dC, hmdC, fdC, and cadC, but we were unable to detect either m4dC or m6dA in DNA isolated from mouse embryonic stem cells or brain and liver tissue, which calls into question their epigenetic relevance.
Oligodeoxynucleotides containing 2′-deoxy-1-methyladenosine and Dimroth rearrangement
Timofeev, Edward N.,Mikhailov, Sergey N.,Zuev, Andrei N.,Efimtseva, Ekaterina V.,Herdewijn, Piet,Somers, Robert L.,Lemaitre, Marc M.
, p. 928 - 937 (2008/02/04)
2′-Deoxy-1-methyladenosine was incorporated into synthetic oligonucleotides by phosphoramidite chemistry. Chloroacetyl protecting group and controlled anhydrous deprotection conditions were used to avoid Dimroth rearrangement. Hybridization studies of int
Synthesis of oligodeoxynucleotides containing 6-N-([13C]methyl)adenine and 2-N-([13C]methyl)guanine
Hofmann, Mechtild,Acedo, Montse,Fagan, Patricia,Wemmer, David,Eritja, Ramon,Diaz, Antonio R.
, p. 1825 - 1828 (2007/10/03)
Oligonucleotides containing 6-N-([l3C]methyl)adenine and 2-N-([13C]methyl)guanine have been prepared for NMR studies using the deprotection step to introduce the [13C]methylamine group. For this purpose, the use of 2′-deoxy-6-O-(pentafluorophenyl)inosine 1 and 2′-deoxy-2-fluoro-6-O-[2-(4-nitrophenyl)-ethyl]inosine 2 as precursors of the N-methylated nucleosides is described. Preliminary NMR characterization of the 13C-labelled oligonucleotides shows that the 13C chemical shift of the methyl group in N-methylguanine is sensitive to duplex formation, making it a useful local probe.