PCR-RFLP method applied for identification of Warmblood Fragile Foal Syndrome carriers in Polish warmblood horses.

Objective Overview

• This study developed and used a PCR-RFLP method to identify carriers of Warmblood Fragile Foal Syndrome (WFFS) in Polish warmblood horses.
• The research found a low carrier frequency of 2.59% among the tested horses in Poland.

Background on Warmblood Fragile Foal Syndrome (WFFS)

• WFFS is a genetic disorder affecting warmblood horses, caused by a mutation in the PLOD1 gene.
• Foals affected by WFFS typically exhibit fragile connective tissue leading to severe skin and joint problems.
• Understanding carrier status in horses is important for breeding decisions to prevent affected offspring.

Methodology: PCR-RFLP Technique

• The study focused on detecting the specific causative mutation in the PLOD1 gene responsible for WFFS.
• Polymerase Chain Reaction (PCR) was used to amplify a 259 base pair segment of the PLOD1 gene containing the mutation site.
• The PCR product was then digested with the restriction enzyme Aci I, which cuts DNA at a specific recognition site.
• The presence or absence of this cut by Aci I indicated whether the horse carried the mutated allele.
• This process allowed for clear differentiation between carriers (heterozygotes) and non-carriers.

Results: Carrier Frequency in Polish Warmblood Horses

• A total of 308 warmblood horses across multiple Polish farms were tested using the developed method.
• Eight horses were identified as carriers of the WFFS mutation.
• This translates to a carrier frequency of approximately 2.59% within the tested population.
• The low frequency suggests a limited distribution of the mutation in Polish warmblood populations.

Significance and Recommendations

• The PCR-RFLP method is effective for routine screening of WFFS carrier status in warmblood horses.
• Low carrier frequency currently indicates reduced risk of WFFS-affected foals in Poland, but vigilance is necessary.
• Breeders should consider genetic testing, especially for horses with pedigrees linked to known WFFS carriers.
• Further research involving larger and more diverse horse populations is recommended to accurately assess the prevalence.
• Monitoring breeds with known risk will help manage and reduce incidence of WFFS in future generations.