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The origin of genomic N 6-methyl-deoxyadenosine in mammalian cells.

Tipo de material: TextoTextoSeries ; Nature Chemical Biology, 16(6), p.630-634, 2020Trabajos contenidos:
  • Musheev, M. U
  • Baumgärtner, A
  • Krebs, L
  • Niehrs, C
Recursos en línea: Resumen: The proposal that N6-methyl-deoxyadenosine (m6dA)acts as an epigenetic mark in mammals remains controversial. Using isotopic labeling coupled to ultrasensitive mass spectrometry, we confirm the presence of low-level m6dA in mammalian DNA. However, the bulk of genomic m6dA originates from ribo-N6-methyladenosine, which is processed via the nucleotide-salvage pathway and misincorporated by DNA polymerases. Our results argue against m6dA acting as a heritable, epigenetic DNA mark in mammalian cells.
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The proposal that N6-methyl-deoxyadenosine (m6dA)acts as an epigenetic mark in mammals remains controversial. Using isotopic labeling coupled to ultrasensitive mass spectrometry, we confirm the presence of low-level m6dA in mammalian DNA. However, the bulk of genomic m6dA originates from ribo-N6-methyladenosine, which is processed via the nucleotide-salvage pathway and misincorporated by DNA polymerases. Our results argue against m6dA acting as a heritable, epigenetic DNA mark in mammalian cells.

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