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- Title
One, No One, and One Hundred Thousand: The Many Forms of Ribonucleotides in DNA.
- Authors
Nava, Giulia Maria; Grasso, Lavinia; Sertic, Sarah; Pellicioli, Achille; Muzi Falconi, Marco; Lazzaro, Federico
- Abstract
In the last decade, it has become evident that RNA is frequently found in DNA. It is now well established that single embedded ribonucleoside monophosphates (rNMPs) are primarily introduced by DNA polymerases and that longer stretches of RNA can anneal to DNA, generating RNA:DNA hybrids. Among them, the most studied are R-loops, peculiar three-stranded nucleic acid structures formed upon the re-hybridization of a transcript to its template DNA. In addition, polyribonucleotide chains are synthesized to allow DNA replication priming, double-strand breaks repair, and may as well result from the direct incorporation of consecutive rNMPs by DNA polymerases. The bright side of RNA into DNA is that it contributes to regulating different physiological functions. The dark side, however, is that persistent RNA compromises genome integrity and genome stability. For these reasons, the characterization of all these structures has been under growing investigation. In this review, we discussed the origin of single and multiple ribonucleotides in the genome and in the DNA of organelles, focusing on situations where the aberrant processing of RNA:DNA hybrids may result in multiple rNMPs embedded in DNA. We concluded by providing an overview of the currently available strategies to study the presence of single and multiple ribonucleotides in DNA in vivo.
- Subjects
RIBONUCLEOTIDES; DNA; RIBONUCLEOSIDE diphosphate reductase; DNA polymerases; NUCLEIC acids; DNA replication; RIBONUCLEASE H
- Publication
International Journal of Molecular Sciences, 2020, Vol 21, Issue 5, p1706
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms21051706