[G4-quadruplexes and genome instability]

Area of Science:

• Genomics
• Molecular Biology
• Bioinformatics

Background:

• Non-canonical DNA structures like G-quadruplexes are implicated in gene regulation and genomic instability.
• Understanding their distribution and evolutionary conservation is crucial for comprehending genome dynamics.

Purpose of the Study:

• To perform an in silico comparative analysis of G-quadruplex forming sequences in vertebrate and yeast nuclear and mitochondrial genomes.
• To investigate the localization, evolutionary conservation, and homology of these sequences.

Main Methods:

• In silico comparative analysis of nucleotide sequences.
• Genome-wide distribution analysis within nuclear and mitochondrial DNA.
• Bioinformatic approaches for evolutionary conservation and homology assessment.

Main Results:

• Potential G-quadruplexes preferentially localize within non-coding sequences across species and genomes.
• Evidence of evolutionary conservation and homology between nuclear and mitochondrial G-quadruplexes was found.
• The study identified potential G-quadruplexes in both nuclear and mitochondrial genomes of vertebrates and yeast.

Conclusions:

• G-quadruplexes are widespread in non-coding regions of both nuclear and mitochondrial genomes, suggesting functional importance.
• The findings support a possible interrelation between G-quadruplexes, Pif1 helicase, and the maintenance of genomic stability.
• Further research is warranted to elucidate the precise roles of G-quadruplexes in gene regulation and genome integrity.