Skin malformations in a neonatal foal tested homozygous positive for Warmblood Fragile Foal Syndrome.
Authors: Monthoux Chloé, de Brot Simone, Jackson Michelle, Bleul Ulrich, Walter Jasmin
Journal: BMC veterinary research
Summary
# Editorial Summary: Warmblood Fragile Foal Syndrome Warmblood Fragile Foal Syndrome Type 1 (WFFS) is an inherited collagen disorder caused by mutations in the PLOD1 gene, which encodes lysyl hydroxylase 1—an enzyme critical for normal collagen cross-linking and skin integrity. This case report documents a neonatal Warmblood foal that presented with severe skin fragility and malformations consistent with an Ehlers-Danlos-like syndrome and was subsequently confirmed homozygous positive for the WFFS mutation. The clinical manifestations paralleled those seen in human Ehlers-Danlos Syndrome Type VI (kyphoscoliotic form), highlighting the shared molecular pathology across species and the fundamental importance of proper collagen maturation for skin mechanical properties. Since genetic testing became available in 2013, WFFS has been identified across multiple equine breeds beyond Quarter Horses (where the analogous condition HERDA was first characterised), yet epidemiological data remain sparse and clinical presentation varies considerably. For breeding programmes and clinical practitioners, this case reinforces the value of genetic screening in at-risk bloodlines and the need for careful selection against carrier animals to prevent the birth of affected foals with severely compromised skin integrity and associated complications.
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Practical Takeaways
- •Genetic testing for WFFS (available since 2013) can identify homozygous affected foals at birth, enabling early management and breeding decisions
- •WFFS presents with visible skin fragility and malformations in neonates; suspect cases warrant genetic confirmation via PLOD1 testing
- •Breeding programs in Warmblood horses should incorporate genetic screening to prevent homozygous affected offspring
Key Findings
- •A neonatal Warmblood foal was identified homozygous positive for WFFS through genetic testing of PLOD1 gene mutation
- •Clinical presentation included skin malformations resembling Ehlers-Danlos Syndrome characteristics
- •WFFS Type 1 is caused by point mutation in equine procollagen-lysine, 2-oxoglutarate 5-dioxygenase 1 (PLOD1) gene, analogous to human Ehlers-Danlos Syndrome Type VI