Putative HIV and SIV G-Quadruplex Sequences in Coding and Noncoding Regions Can Form G-Quadruplexes

Area of Science:

• Molecular Biology
• Virology
• Genetics

Background:

• The Human Immunodeficiency Virus (HIV) is extensively studied, with over 9,000 genomic sequences analyzed.
• G-quadruplex structures are increasingly recognized for their roles in biological processes.

Purpose of the Study:

• To analyze G-rich DNA sequences within HIV for potential G-quadruplex formation.
• To identify novel therapeutic targets for HIV antiviral therapies.

Main Methods:

• Analysis of DNA sequences from HIV isolates for G-quadruplex forming potential.
• Application of spectral and electrophoretic methods.
• Utilizing induced circular dichroism with G-quadruplex-ligand complexes (Thiazole Orange) to confirm structure.

Main Results:

• G-rich sequences with G-quadruplex forming potential were identified in multiple HIV genomic regions (U3 LTR, tat, rev, env, vpx).
• A sequence homologous to the HIV integrase aptamer was found in the minus-strand.
• Experimental methods confirmed the ability of these G-rich sequences to adopt G-quadruplex structures.

Conclusions:

• The presence of G-quadruplexes in HIV presents attractive therapeutic targets.
• Targeting these structures could lead to the development of novel antiviral strategies.
• Further analysis of G-rich regions may uncover specific targets for various virus types.