PARP1 Gene Knockout Suppresses Expression of DNA Base Excision Repair Genes

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Poly(ADP-ribose) polymerase 1 (PARP1) is crucial in DNA repair.
• Understanding PARP1's role in DNA base excision repair (BER) is essential for therapeutic strategies.

Purpose of the Study:

• To investigate the impact of PARP1 knockout on gene expression within the DNA base excision repair (BER) pathway.
• To establish a PARP1-deficient cell line for studying BER activity and drug inhibition.

Main Methods:

• Gene expression analysis in HEK293 cells with PARP1 knockout.
• Identification of differentially expressed genes (DEGs) related to BER.
• Assessment of NEIL1 and DNA polymerase subunit gene expression.

Main Results:

• PARP1 knockout led to a reduction in the expression of all studied BER-related DEGs.
• The most significant change was observed in the expression of the NEIL1 gene, a key BER protein hub.
• Expression of auxiliary subunits for DNA polymerases δ and ε was also significantly decreased.
• Novelly, PARP1 knockout affected the expression of proteins involved in ribosome biogenesis and proteasome function.

Conclusions:

• The generated PARP1 knockout HEK293 cell line serves as an effective model for BER research and drug development.
• PARP1 deficiency profoundly impacts the expression of genes critical for DNA repair, ribosome biogenesis, and proteasome activity.