High-Mobility Group Box Protein 3 (HMGB3) Facilitates DNA Interstrand Crosslink Processing and Double-Strand Break...

Area of Science:

• Molecular Biology
• Genetics
• Cancer Research

Background:

• DNA-damaging agents are crucial in cancer chemotherapy but can cause genetic instability.
• Understanding DNA damage processing is key to improving cancer treatments.
• High-mobility group box protein 1 (HMGB1) is a nucleotide excision repair (NER) cofactor, and HMGB3 is linked to chemoresistance.

Purpose of the Study:

• To investigate the potential roles of High-mobility group box protein 3 (HMGB3) in processing DNA damage.
• To determine if HMGB3 functions similarly to HMGB1 in DNA repair pathways.

Main Methods:

• Utilized HMGB3 knockout human cell lines to assess roles in nucleotide excision repair (NER) after UV damage.
• Employed mutagenesis assays, metaphase spreads, foci formation, DNA repair assays, and TagSeq analyses to study roles in DNA double-strand break (DSB) and interstrand crosslink (ICL) repair.

Main Results:

• HMGB3 does not appear to be involved in NER, unlike HMGB1.
• Evidence suggests HMGB3 actively participates in the processing of both DSBs and ICLs in human cells.

Conclusions:

• HMGB3 has a distinct role in DNA damage repair compared to HMGB1.
• These findings highlight HMGB3's involvement in DNA repair and its potential as a target for novel cancer chemotherapeutic strategies.