A 2-Year-Old Filly With Hereditary Equine Regional Dermal Asthenia: The First Case Report From China.
Authors: Li 李靖 Jing, Liu Bo, Yu Feng, Liu Tianlong, Peng Yushi, Fu Yunhe
Journal: Journal of equine veterinary science
Summary
# Editorial Summary: First Documented Case of HERDA in China Highlights Need for Genetic Screening in Asian Breeding Programmes Hereditary equine regional dermal asthenia (HERDA) is a recessive genetic condition previously reported only in Quarter Horses and related breeds, characterised by severe dermatological fragility and compromised skin integrity. This case report documents the first confirmed diagnosis of HERDA in Asia, involving a 2-year-old Quarter Horse filly presenting with abnormally stretchy, lax skin and chronic non-healing wounds over the dorsal body surface, with histopathological findings consistent with previously established diagnostic criteria for the condition. Genetic testing confirmed the hereditary basis of the disease, and alongside clinical examination and skin biopsy analysis, provided definitive diagnosis in a region where HERDA had not previously been recognised. The authors emphasise that the emergence of HERDA in Chinese breeding stock suggests the disease may be more geographically widespread than previously documented, particularly as Quarter Horse breeding programmes expand globally. For equine professionals across Asia—particularly those involved in breeding management, farriery and veterinary care—implementation of genetic screening protocols before breeding decisions is now essential to prevent further transmission of this debilitating and currently incurable condition within regional populations.
Read the full abstract on PubMed
Practical Takeaways
- •Veterinarians in Asia should be aware that HERDA can occur in Quarter Horses and related breeds in their region, not just in Western populations
- •Genetic testing should be implemented on breeding farms to identify carriers and prevent transmission of this autosomal recessive trait
- •Clinical signs of stretchy, loose skin with spontaneous wounds warrant investigation for HERDA, particularly in Quarter Horse bloodlines
Key Findings
- •A 2-year-old Quarter Horse filly presented with stretchy, loose, thin skin and open wounds on the upper body consistent with HERDA
- •Skin biopsy findings were consistent with previously documented HERDA pathology
- •Genetic testing confirmed HERDA diagnosis in this first reported case from China and Asia
- •HERDA is an autosomal recessive inheritable disorder requiring breeding farm implementation of genetic testing protocols