Identification of differentially expressed genes in early-postmortem Semimembranosus muscle of Italian Large White heavy pigs divergent for glycolytic potential

Glycolytic potential (GP) is one of the postmortem traits used to predict the quality of the final meat products.
Despite that, the knowledge of the molecular and metabolic pathways controlling this trait is still not complete.
To add some information on this field we used two pools of Italian Large White heavy pigs divergent for GP to
investigate through a microarray approach the differences of gene expressions between the two pools. On the
whole, 32 genes were differentially expressed, and among them 31 were overexpressed in low GP pool. These
genes were involved in mitochondrial functions and adenosine triphosphate (ATP) biosynthetic processes, in
calcium homeostasis, and in lipid metabolism, with Peroxisome proliferator-activated receptor (PPAR) signaling
being a possible master regulator of the molecular differences observed between the two pools. The different GP
levels between the two pools could have determined in low GP muscles a more rapid occurrence of the molecular
cascade related to the events triggering cell death.