Research Note: Chicken breast muscle satellite cell function: effect of expression of CNN1 and PHRF1

The Wooden Breast myopathy results in the necrosis and fibrosis of breast muscle fibers in fastgrowing heavy weight meat -type broiler chickens. Myogenic satellite cells are required to repair and regenerate the damaged muscle fibers. Using Genome Wide Association, candidate genes affected with Wooden Breast have been previously reported. The effect of these genes on satellite cell proliferation, differentiation, and the synthesis of lipids by satellite cells is unknown. Satellite cells isolated from the pectoralis major muscle from commercial Ross 708 broilers and a Randombred chicken ( RBch ) line were used. Expression of calponin 1 ( CNN1 ) and PHD and ring fingers domains 1 ( PHRF1 ) were knocked down by silent interfering RNA to determine their effect on satellite cell -mediated proliferation, differentiation, and lipid accumulation. CNN1 and PHRF1 affected satellite cell activity and lipid accumulation in both lines. Proliferation was reduced in the Ross 708 and RBch lines by knocking down the expression of both genes, and differentiation was affected with a line and treatment interaction when gene expression was reduced at the beginning of proliferation. During differentiation lipid accumulation was decreased with knocking down the expression of CNN1 and PHRF1 . Both CNN1 and PHRF1 have not been reported previously in skeletal muscle and further research is required to determine their effect on satellite cell -mediated growth and regeneration of the pectoralis major (breast) muscle.