Schistosomus reflexus syndrome: a heritable defect in ruminants

Area of Science:

• Veterinary Anatomy
• Developmental Biology
• Congenital Disorders

Background:

• Schistosomus reflexus (SR) is a rare, fatal congenital disorder primarily affecting ruminants.
• Key features include spinal inversion, ventral abdominal fissure, limb ankylosis, and hypoplastic lungs/diaphragm.

Observation:

• Anatomical analysis of a female Holstein calf with Schistosomus reflexus.
• The calf presented with thoracoschisis, scoliosis, and anomalies in skeletal, cardiovascular, respiratory, digestive, and urogenital systems.
• Unique Muellerian duct abnormalities were observed in the reproductive tract.

Findings:

• Detailed anatomical description of a complex Schistosomus reflexus case, including previously unreported malformations.
• Identification of novel reproductive tract abnormalities in Schistosomus reflexus.
• Evidence suggests SR develops early in embryonic development (post-gastrulation) and involves the intermediate mesoderm.

Implications:

• The findings contribute to understanding the pathogenesis of Schistosomus reflexus.
• Suggests a potential genetic etiology for Schistosomus reflexus, warranting further investigation.
• Highlights the complexity and variability of congenital anomalies in affected livestock.