Roles of the major apoptotic nuclease-DNA fragmentation factor-in biology and disease

Area of Science:

• Molecular Biology
• Cell Biology
• Genetics

Background:

• The DNA fragmentation factor (DFF), also known as caspase-activated DNase (CAD), is a key nuclease in apoptosis.
• Over ten years post-discovery, new insights into DFF's regulation and its roles in human disease have emerged.

Purpose of the Study:

• To review recent literature on DNA fragmentation factor (DFF) / caspase-activated DNase (CAD).
• To elucidate the regulatory mechanisms of DFF.
• To examine the positive and negative implications of DFF in human diseases.

Main Methods:

• Literature review of recent studies on DFF/CAD.
• Analysis of DFF's role in apoptosis and DNA degradation.
• Investigation of DFF's association with cancer, autoimmune diseases, and other pathologies.

Main Results:

• DFF-deficient cells undergo apoptosis, with DNA degradation occurring via lysosomal DNase II post-phagocytosis.
• DFF-deficient mice exhibit increased susceptibility to cancer, suggesting DFF acts as a p53-independent tumor suppressor.
• DFF dysregulation is linked to systemic lupus erythematosus, mixed lineage leukemias, and potential horizontal gene transfer of oncogenes and HIV.

Conclusions:

• DFF/CAD is a critical regulator of DNA degradation during apoptosis.
• DFF functions as a tumor suppressor, and its defects are implicated in various human cancers.
• Conversely, DFF activity can exacerbate certain diseases, including autoimmune disorders and leukemias, and may facilitate oncogene/viral spread.