G-quadruplex resolution: From molecular mechanisms to physiological relevance

Area of Science:

• Genomics and Molecular Biology
• DNA Structure and Function
• Cancer Genomics

Background:

• Guanine-rich DNA sequences form G-quadruplexes (G4s), which are prevalent in gene regulatory regions.
• G4 structures are implicated in gene expression, genome maintenance, and can impede DNA replication, leading to mutations.
• Accumulation of G4-associated somatic mutations is observed in cancer genomes.

Approach:

• Review of current knowledge on genomic G-quadruplex landscapes.
• Analysis of the impact of G4 structures on DNA replication and genome integrity.
• Description of recent advances in understanding G4 resolution mechanisms and their physiological relevance.

Key Points:

• G-quadruplexes (G4s) are non-canonical DNA structures found in the human genome, particularly in active gene regulatory regions.
• G4 formation is linked to gene expression and genome maintenance but can also cause DNA replication stress and mutations.
• Specialized DNA helicases and proteins resolve G4 structures, crucial for maintaining genome stability.

Conclusions:

• Understanding G4 resolution mechanisms is vital for comprehending genome stability.
• Targeting G4 structures presents potential therapeutic opportunities for cancer treatment.
• Further research into G4 dynamics and resolution pathways will illuminate their role in health and disease.