Mapping quantitative trait loci for cytokines in the pig

Area of Science:

• Animal Genetics
• Immunology
• Veterinary Science

Background:

• Improving disease resistance is crucial for farm animal welfare and productivity.
• Cytokines, such as Interferon-gamma (IFN-γ) and Interleukin 10 (IL-10), are key indicators of immune status in veterinary diagnostics.

Purpose of the Study:

• To map quantitative trait loci (QTL) associated with serum levels of IFN-γ and IL-10 in pigs.
• To investigate the genetic basis of immune response variation in a composite pig population.

Main Methods:

• Serum cytokine levels (IFN-γ, IL-10) and their ratio were measured in pigs before and after vaccination.
• Interval mapping using a variance component approach and permutation testing was employed to identify QTL.
• A composite pig population was utilized for genetic analysis.

Main Results:

• Eleven significant QTL were identified for IFN-γ, IL-10, and their ratio (P < 0.10), with five reaching P < 0.05 significance.
• A highly significant QTL (P < 0.01) affecting the IFN-γ to IL-10 ratio was located on chromosome 16.
• Several known genes within QTL regions were identified as potential candidates for influencing immune traits in swine.

Conclusions:

• Genetic variation for immune response traits, specifically cytokine levels, exists in pigs.
• The identified QTL provide targets for marker-assisted selection to enhance disease resistance in swine.
• Candidate genes within QTL regions warrant further investigation for their role in swine immunity.