Warmblood Fragile Foal Syndrome causative single nucleotide polymorphism frequency in Warmblood horses in Brazil.

This research paper explores the prevalence of a genetic mutation that causes Warmblood Fragile Foal Syndrome (WFFS) in Warmblood horses in Brazil.

Context and Objectives

• The study investigates Warmblood Fragile Foal Syndrome (WFFS), an autosomal recessive genetic disorder identified in Warmblood horses. The condition is linked to a mutation in the procollagen-lysine, 2-oxoglutarate 5-dioxygenase 1 (PLOD1) gene which is involved in collagen formation.
• Typically, horses affected with WFFS present with symptoms such as skin lesions and malformations. In severe cases, WFFS can lead to abortions in neonatal foals.
• The specific goal of this study is to determine the prevalence of the single nucleotide polymorphism (SNP) c.2032G>A (a type of mutation) in the PLOD1 gene in a Brazilian sample of Warmblood horses.

Methodology

• A total of 374 Warmblood horses in Brazil were investigated as part of this study.
• Genetic testing was conducted to ascertain the presence of the c.2032G>A SNP in the PLOD1 gene. Each horse was classified as either heterozygous for the WFFS SNP or homozygous for the wild-type allele (N/N).

Findings

• Out of the 374 horses tested, the researchers found that 41 animals (11% of the sample) were heterozygous for the WFFS SNP, meaning they carried one copy of the mutated gene. Meanwhile, 333 horses (or 89% of the sample) were homozygous for the normal, or “wild-type”, form of the gene.
• The allele frequency of the SNP, displaying how common this genetic variant is among the population studied, was found to be 5.5%.

Implications

• The study underscores the importance of implementing control measures to prevent a rise in the incidence of WFFS in Warmblood horses worldwide. Given the notable presence of the WFFS SNP in the studied population, selective breeding programs could be targeted to minimize the risk of transmitting this genetic mutation.
• The findings also suggest the need for continued genetic screening, particularly in breeding stock, to identify potential carriers of WFFS and strengthen disease prevention measures.