A bouquet of DNA structures: Emerging diversity

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• DNA's double helical model is classical, but DNA exhibits significant structural polymorphism.
• Non-canonical DNA structures, including hairpin, cruciform, triplex, quadruplex, and i-motif, occur in vivo.
• These structures play active roles in essential cellular processes like replication, transcription, recombination, and repair.

Purpose of the Study:

• To review non-canonical DNA structures and their formation prerequisites.
• To explore the functional implications of DNA conformational polymorphism.
• To highlight the therapeutic potential of targeting these structures in diseases.

Main Methods:

• Literature review of studies on DNA structural polymorphism.
• Analysis of sequence, length, strand orientation, and solution conditions for non-canonical structure formation.
• Examination of the in vivo occurrence and biological relevance of these structures.

Main Results:

• DNA adopts diverse non-canonical structures beyond the Watson-Crick duplex.
• Formation of these structures depends on specific sequence, length, strand, and solution conditions.
• Linkages between non-canonical DNA structures and diseases such as cancer and genetic disorders have been identified.

Conclusions:

• DNA's conformational polymorphism is fundamental to its diverse functions.
• Non-canonical DNA structures are critical in cellular processes and disease pathogenesis.
• Targeting these unique DNA structures offers promising avenues for drug design and therapeutic interventions.