Telomerase as a potential molecular target to study G-quartet phosphorothioates

Area of Science:

• Molecular Biology
• Biochemistry
• Oligonucleotide Therapeutics

Background:

• Gene expression can be inhibited by phosphorothioate oligomers through complex mechanisms.
• G-quartet containing oligomers exhibit sequence-dependent effects in vitro and in vivo.
• Telomerase, a ribonucleoprotein enzyme, synthesizes telomeric repeats using a C-rich RNA template.

Purpose of the Study:

• To investigate the inhibitory effects of G-quartet containing phosphorothioate oligomers on telomerase activity.
• To determine the role of sequence context in G-quartet mediated inhibition.
• To compare the efficacy of phosphorothioate G-quartet oligomers with other oligomer types.

Main Methods:

• Synthesis and testing of various phosphorothioate oligomers, including those containing G-quartets.
• In vitro assays to measure telomerase activity.
• Assays to assess the impact on control enzymes like reverse transcriptase and Taq polymerase.

Main Results:

• Some G-quartet containing phosphorothioates inhibited telomerase activity in vitro, contingent on sequence context.
• Phosphorothioates lacking G-quartets did not inhibit telomerase.
• G-quartet oligomers did not affect the activity of control enzymes.
• Phosphorothioate G-quartet oligomers were more potent inhibitors than phosphodiester or chimeric analogues.

Conclusions:

• The inhibitory effect of G-quartet containing phosphorothioate oligomers on telomerase is sequence-dependent.
• G-quartet containing phosphorothioate oligomers represent a potential molecular target for therapeutic intervention.
• Further research is warranted to elucidate the precise mechanisms and optimize these oligomers.