Identification of small molecules that are synthetically lethal upon knockout of the RNA ligase Rlig1 in human cells

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• RNA ligase 1 (Rlig1) is a conserved enzyme in vertebrates, crucial for RNA ligation and implicated in various cancers.
• Rlig1-knockout cells exhibit heightened sensitivity to menadione-induced stress, indicating a synthetic lethality interaction.

Purpose of the Study:

• To identify novel small molecules that induce synthetic lethality in Rlig1-deficient cells.
• To explore new therapeutic strategies targeting cancers with Rlig1 mutations.

Main Methods:

• High-throughput screening of over 13,000 bioactive small molecules.
• Testing compounds for synthetic lethality in combination with Rlig1-knockout in HEK293 cells.
• Evaluation of small molecules, including those with a naphthoquinone scaffold.

Main Results:

• Identification of novel small molecules that display synthetic lethality with Rlig1-knockout cells.
• Discovery of compounds structurally distinct from menadione that induce this effect.
• Confirmation of synthetic lethality with certain naphthoquinone-containing molecules.

Conclusions:

• The study successfully identified new small molecules that are synthetically lethal with Rlig1 deficiency.
• These findings offer potential new avenues for developing targeted cancer therapies.
• Further research into Rlig1's biological pathways and synthetic lethal interactions is warranted.