Genetic predisposition to coronavirus-induced retinal disease

Area of Science:

• Ophthalmology
• Virology
• Immunology

Background:

• Retinal inflammatory and degenerative diseases are often linked to host genetic factors.
• Murine coronavirus (mouse hepatitis virus, MHV), JHM strain, is known to cause biphasic retinal disease in susceptible mice.
• Host genetics and virus serotype play critical roles in determining viral infection outcomes.

Purpose of the Study:

• To investigate the role of host genetics in the development of murine coronavirus-induced retinal disease.
• To compare the susceptibility of different mouse strains to MHV-induced retinal pathology.
• To understand how genetic factors influence the biphasic nature of MHV retinal disease.

Main Methods:

• Intravitreal inoculation of JHM virus into BALB/c, CD-1, and A/J mice.
• Histological evaluation of eye tissues at various time points post-inoculation.
• Assessment of anti-JHM virus antibody responses using neutralization assays.

Main Results:

• BALB/c mice exhibited a biphasic retinal disease with early vasculitis and later degeneration.
• A/J mice showed a similar biphasic pattern but with less severe retinal damage compared to BALB/c mice.
• CD-1 mice only developed the early inflammatory phase (vasculitis), with retinas appearing normal by day 10, indicating resistance to degeneration.

Conclusions:

• Host genetics profoundly impact the type and severity of retinal tissue damage induced by MHV.
• These findings support the concept that viral infections can trigger retinal degenerative processes in genetically susceptible individuals.
• Genetic susceptibility is a key determinant in the progression of viral-induced retinal disease.