Zebrafish as a model system to study DNA damage and repair

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• Zebrafish (Danio rerio) are valuable vertebrate models for embryological development and human disease studies, including cancer etiology.
• Despite sharing gene functions with humans, systematic studies on DNA damage and repair pathways in zebrafish are limited.
• The zebrafish genome encompasses most eukaryotic DNA repair pathways (e.g., BER, NER, HR) and the p53 pathway.

Purpose of the Study:

• To review recent DNA damage and repair studies in zebrafish.
• To emphasize the role of Base Excision Repair (BER) in early zebrafish embryological development.
• To explore the function of AP endonuclease 1 (Apex1) in DNA repair and its regulatory roles.

Main Methods:

• Literature review of DNA damage and repair studies in zebrafish.
• Focus on the Base Excision Repair (BER) pathway and its components.
• Analysis of the regulatory functions of AP endonuclease 1 (Apex1).

Main Results:

• Zebrafish possess comprehensive DNA repair machinery, making them suitable for studying these pathways.
• Base Excision Repair (BER) plays a significant role in zebrafish early embryological development.
• AP endonuclease 1 (Apex1) is crucial for BER and regulates Creb1 and p53 levels, similar to findings in murine B cells.

Conclusions:

• Zebrafish offer a powerful model for fundamental insights into DNA damage and repair mechanisms.
• The study underscores the importance of BER and Apex1 in zebrafish development.
• Findings in zebrafish have implications for understanding DNA repair in other vertebrates, including humans.