Peters anomaly in a red kangaroo (Macropus rufus)

Area of Science:

• Veterinary Ophthalmology
• Comparative Pathology
• Genetics

Background:

• Congenital corneal opacity can significantly impair vision in animals.
• Anterior segment dysgenesis encompasses a spectrum of developmental abnormalities of the eye.
• Peters anomaly is a specific form of anterior segment dysgenesis characterized by corneal and iris defects.

Observation:

• A 10-month-old female red kangaroo presented with unilateral corneal opacity (OD).
• Ophthalmic examination revealed shallow anterior chamber, corneal edema, and persistent pupillary membranes.
• B-scan ultrasound showed thinning of Descemet's membrane in the affected corneal area.

Findings:

• Clinical and ultrasound findings were consistent with Peters anomaly.
• Electroretinogram showed no specific abnormalities.
• Karyotype analysis revealed a normal diploid number with an abnormal pericentric inversion in a large chromosomal pair.

Implications:

• This is a rare reported case of Peters anomaly in a red kangaroo.
• The identified chromosomal abnormality suggests a potential genetic basis for the condition.
• Breeding cessation was implemented to prevent the transmission of this anomaly to future offspring.