i-Motif DNA: identification, formation, and cellular functions.

Area of Science:

• * Molecular Biology
• * Genetics
• * Biochemistry

Background:

• * The i-motif (iM) is a unique four-stranded DNA structure (quadruplex) formed from cytosine-rich sequences.
• * iMs can form under diverse conditions in vitro, suggesting potential for in vivo formation and function.
• * These structures are implicated in critical cellular processes including genome stability, gene transcription, and DNA replication.

Purpose of the Study:

• * To review techniques for assessing iM folding in vitro.
• * To provide an overview of factors influencing iM formation and stability in vivo.
• * To discuss the biological relevance of iMs and their potential as therapeutic targets.

Main Methods:

• * Literature review of techniques for iM folding assessment.
• * Analysis of internal and external factors affecting iM formation and stability.
• * Synthesis of current knowledge on iM biological roles.

Main Results:

• * Various in vitro techniques exist to study iM folding.
• * Both intrinsic sequence properties and extrinsic cellular conditions influence iM formation and stability.
• * iMs play significant roles in genome stability, gene regulation, and disease processes.

Conclusions:

• * i-motifs are versatile DNA structures with significant biological roles.
• * Understanding the factors governing iM formation is key to harnessing their potential.
• * iMs represent promising targets for therapeutic interventions in various human diseases.