Pig lacks functional NLRC4 and NAIP genes

Area of Science:

• Immunology
• Genetics
• Veterinary Science

Background:

• The NLRC4 inflammasome recognizes bacterial components like flagellin, aiding intracellular pathogen clearance.
• Key genes for NLRC4 inflammasome function are NLRC4 and NLR apoptosis inhibitory protein (NAIP).

Purpose of the Study:

• To investigate the presence and functionality of NLRC4 and NAIP genes in pigs.
• To understand the implications for pig immunity and disease resistance.

Main Methods:

• Genomic sequencing of pig DNA to analyze NLRC4 and NAIP gene loci.
• Comparative sequence analysis with human genes.
• Gene expression analysis in pigs.

Main Results:

• Pigs possess a single locus for NLRC4 and NAIP genes.
• Intermediate exons are deleted, and functional open reading frames are absent in pig NLRC4 and NAIP genes.
• Neither NLRC4 nor NAIP genes are expressed in pigs across various breeds and wild boars.

Conclusions:

• Pigs lack a functional NLRC4 inflammasome.
• Genetic variations in other pattern recognition receptors, such as TLRs, likely have a greater impact on pig disease resistance compared to other species.