The Interplay between Viruses and Host DNA Sensors

Area of Science:

• Immunology
• Virology
• Molecular Biology

Background:

• DNA virus infections pose significant health challenges, necessitating robust host defense mechanisms.
• Innate immune system sensors are critical for early detection and response to viral DNA, forming the first line of defense.
• Understanding these molecular interactions is key to developing effective antiviral therapies.

Purpose of the Study:

• To review current knowledge on viral DNA genome sensing mechanisms.
• To elucidate the primary innate immune pathways induced by viral DNA detection.
• To highlight viral strategies for evading DNA sensing.

Main Methods:

• Literature review of studies on DNA sensing pathways and viral interactions.
• Analysis of molecular mechanisms involving DNA sensors like cGAS, IFI16, DDX41, DNA-PK, and TLR9.
• Examination of viral evasion strategies employed by various DNA viruses.

Main Results:

• Herpesviruses, adenoviruses, and polyomaviruses are recognized by specific DNA sensors.
• STING pathways (activated by cGAS, IFI16, DDX41, DNA-PK) and TLR9 are key in sensing viral DNA in different cell types.
• Novel participants like BRCA1 and H2B in IFI16 sensing and micronuclei involvement in polyomavirus infection were identified.
• Viruses such as papillomaviruses, HBV, and HIV utilize sophisticated mechanisms to evade DNA sensing.

Conclusions:

• Viral DNA sensing involves diverse sensors and pathways, with STING and TLR9 being prominent.
• Herpesviruses and polyomaviruses engage specific sensing pathways, revealing new molecular players.
• Viruses have evolved complex strategies to counteract innate immune DNA sensing.
• Further research is essential to fully map the intricate interplay between viral DNA and host sensors.