The Ultimate (Mis)match: When DNA Meets RNA

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• RNA-containing structures (e.g., ribonucleotide insertions, DNA:RNA hybrids, R-loops) are increasingly recognized for their role in maintaining genome integrity.
• These structures are implicated in various cellular processes, influencing genome stability and metabolism.

Purpose of the Study:

• To review the dual role of RNA-containing structures in genome maintenance.
• To explore how enzymatic activities contribute to the formation and resolution of these structures.
• To discuss the implications of RNA insertions for genome metabolism.

Main Methods:

• Literature review of in vivo and in vitro experimental findings.
• Analysis of enzymatic activities involved in RNA-containing structure metabolism.
• Synthesis of current understanding on the beneficial and detrimental impacts of RNA insertions.

Main Results:

• Enzymatic activities classically involved in genome maintenance are involved in generating, processing, or removing RNA-containing structures.
• DNA polymerases and homologous recombination proteins contribute to the formation of these structures.
• DNA repair enzymes play a role in the removal of RNA-containing structures.

Conclusions:

• The substrate promiscuity of enzymes explains the complex impacts of RNA insertions on genome metabolism.
• The involvement of diverse pathways highlights the ancient role of RNA in genome maintenance and transmission.
• Understanding these RNA-DNA interactions is key to comprehending genome stability.