Genome instabilities arising from ribonucleotides in DNA

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Genomic DNA replication can lead to transient contamination with ribonucleotide residues.
• Replicative DNA polymerases (α, δ, ε) and lagging strand synthesis with RNA primers contribute to this contamination.
• Ribonucleotides are normally removed by RNase H enzymes and lagging strand synthesis machinery.

Purpose of the Study:

• To investigate the genomic instabilities associated with embedded ribonucleotides in DNA.
• To discuss the origins of DNA lesions that stimulate specific classes of genomic instabilities.

Main Methods:

• Review of existing literature on DNA replication and repair mechanisms.
• Analysis of the consequences of unrepaired ribonucleotides in the genome.
• Discussion of lesion origins and their link to instability types.

Main Results:

• Embedded ribonucleotides distort the DNA helix.
• These residues interfere with DNA replication, transcription, and repair machineries.
• Persistent ribonucleotides stimulate genomic instabilities, including mutations, recombination, and chromosome alterations.

Conclusions:

• Unremoved ribonucleotides pose a significant threat to genome integrity.
• Understanding the origin of these lesions is crucial for comprehending associated genomic instabilities.
• Further research into efficient ribonucleotide removal mechanisms is warranted.