Intestinal HAdV Infection: Tissue Specificity, Persistence, and Implications for Antiviral Therapy

Area of Science:

• Virology
• Immunology
• Pediatrics

Background:

• Human adenovirus (HAdV) causes diverse childhood infections, with tissue tropism dictating clinical outcomes.
• Intestinal HAdV infections are significant in pediatric stem cell transplant (SCT) recipients, often preceding clinical symptoms and linked to mortality.
• Antiviral strategies involving interferons may influence HAdV persistence, particularly the repression of the E1A gene.

Purpose of the Study:

• To review intestinal human adenovirus (HAdV) infections, focusing on tissue tropism, persistence, and recombination.
• To discuss the implications of persistent intestinal HAdV in pediatric SCT recipients and the need for further investigation into reactivation and therapy.
• To highlight the emergence of novel recombinant HAdV types in the gut and explore their origins.

Main Methods:

• Literature review of studies on human adenovirus (HAdV) tropism, persistence, and recombination in the intestinal tract.
• Analysis of existing data on HAdV infections in pediatric stem cell transplant recipients.
• Discussion of in-vitro models for studying HAdV-host interactions.

Main Results:

• Specific HAdV species exhibit distinct tissue tropisms, influencing disease presentation.
• Mechanisms of HAdV entry and resistance to immune factors in the intestine are being elucidated.
• Persistent intestinal HAdV infections, especially in immunocompromised children, pose significant clinical challenges.

Conclusions:

• Understanding intestinal HAdV tropism, persistence, and recombination is critical for managing pediatric infections.
• Further research into HAdV reactivation in pediatric SCT recipients is needed to identify effective therapeutic strategies.
• Novel in-vitro models are essential for advancing knowledge of HAdV-host interactions and developing new treatments.