My journey to DNA repair

Area of Science:

• Molecular Biology
• Genetics
• Biochemistry

Background:

• Focus on fundamental DNA repair mechanisms relevant to cancer therapy, genetic disorders, and ancient DNA.
• Initial studies involved measuring DNA decay rates, including base loss and cytosine deamination.

Discussion:

• Detailed investigation into the discovery and mechanisms of action of several crucial DNA repair proteins.
• Exploration of the base excision repair pathway, reconstituted with human proteins.
• Development of cell-free analysis for mammalian nucleotide excision repair.

Key Insights:

• Discovery of uracil-DNA glycosylase, defining a new class of DNA repair enzymes.
• Identification of multiple distinct DNA ligases (I, III, and IV) in mammalian cells.
• Characterization of mammalian exonucleases DNase III (TREX1) and IV (FEN1), with TREX1 alterations linked to autoimmune diseases.
• Elucidation of a novel repair mechanism for O(6)-methylguanine (O(6)mG) involving methyl group transfer to the repair protein.
• Discovery of AlkB's role as an iron-dependent enzyme in oxidative demethylation.

Outlook:

• Potential therapeutic targets for cancer and genetic disorders.
• Implications for understanding DNA integrity in aging and evolutionary studies.
• Further research into the regulation and function of identified DNA repair pathways and proteins.