A New Strategy to Investigate RNA:DNA Triplex Using Atomic Force Microscopy.

Area of Science:

• Molecular Biology
• Genetics
• Biophysics

Background:

• Long non-coding RNAs (lncRNAs) are crucial regulators of gene expression and genome organization.
• LncRNA-DNA interactions occur via protein binding or direct sequence-specific RNA:DNA triplex formation.
• Understanding these interactions is vital for deciphering gene regulatory mechanisms.

Purpose of the Study:

• To develop and validate a novel atomic force microscopy (AFM) strategy for characterizing RNA:DNA triplex formation.
• To visualize and study the specific RNA:DNA triplex formed between Khps1 lncRNA and the SPHK1 gene enhancer.
• To investigate the influence of environmental conditions (pH, temperature) on triplex stability.

Main Methods:

• Utilized atomic force microscopy (AFM) for high-resolution visualization of molecular interactions.
• Focused on the Khps1 lncRNA and its interaction with the SPHK1 enhancer region.
• Performed experiments under varying pH and temperature conditions to assess triplex formation robustness.

Main Results:

• Successfully visualized the formation of RNA:DNA triplexes between Khps1 lncRNA and the SPHK1 enhancer using AFM.
• Demonstrated stable triplex formation across a range of pH and temperature conditions.
• Identified challenges in distinguishing triplexes from R-loops, highlighting the need for refined analytical approaches.

Conclusions:

• Atomic force microscopy provides an effective strategy for visualizing lncRNA:DNA triplex formation at the single-molecule level.
• The study confirms the formation and stability of RNA:DNA triplexes involving Khps1 lncRNA and the SPHK1 enhancer.
• This AFM-based approach offers new perspectives for studying lncRNA-mediated gene regulation.