Genetic screening for cerebellar abiotrophy, severe combined immunodeficiency and lavender foal syndrome in Arabian horses in Poland.

This study examined a variety of genetic disorders in Arabian horses in Poland. The research found that the population was clear of Lavender Foal Syndrome, but carriers for Severe Combined Immunodeficiency (SCID) and Cerebellar Abiotrophy (CA) were present.

Background of the Study

• The research was centered on Arabian horses in Poland due to their significance to many breeding programmes.
• The study aimed to examine the genetic variants involved in the most common genetic disorders of this breed, which include cerebellar abiotrophy (CA), severe combined immunodeficiency (SCID) and lavender foal syndrome (LFS).
• These genetic disorders are suspected to be the result of inbreeding depression and selective breeding habits.
• The economic fallout caused by these genetic disorders is also considerable, motivating the need for a systematic investigation.

Study Methodology

• A total of 808 elite Arabian horses were included in the screening process.
• The team used Sanger sequencing and allelic discrimination methods to screen for the three genetic disorders.

Results of the Study

• The population of Arabian horses investigated were found to be clear of lavender foal syndrome (LFS), indicating that none of the horses in the sample group carried the disorder.
• The unfavorable SCID allele was detected in three horses. These horses were heterozygous, which means that they had one copy of the defective gene and one copy of the normal gene, giving a minor allele frequency of 0.00185.
• In comparison, the minor allele frequency for cerebellar abiotrophy (CA) was found to be greater at 0.04029.
• This study marked the first time SCID carriers were reported in Poland.

Implications of the Study

• The investigation underscores the importance of genetic testing for Mediterranean horses, particularly those involved in breeding programs.
• By identifying and documenting the genetic disorders present in the population, breeders can make more informed decisions that benefit the health and vitality of the horse population.
• This can also assist in monitoring and managing the spread of these genetic diseases in the equine population.