中文摘要：

Background: To explore the relationship between the heart-type fatty acid binding protein(H-FABP) gene and intramuscular fat(IMF), a polymorphism of the second exon of the H-FABP gene was investigated in 60 Three-yellow chickens(TYCs) and 60 Hetian-black chickens(HTBCs).Results: The IMF contents of the cardiac, chest and leg muscles in HTBC were increased compared with TYC. Both TYC and HTBC populations exhibited Hardy-Weinberg Equilibrium(HWE) according to the χ2test. Three variations of the two birds were detected, namely, G939 A, G982 A and C1014 T. HTBCs with the TT genotypes exhibit increased IMF content in the chest muscles compared with the TC genotype. Thus, the G982 A site could be considered a genetic marker for selecting increased IMF content in the chest muscles of HTBC. The correlation coefficients revealed that H-FABP m RNA expression was negatively correlated with the IMF content in the cardiac, chest and leg muscles of HTBC and in the cardiac and chest muscles of TYC. The relative m RNA expression of H-FABP was reduced in the cardiac and leg muscles of HTBC compared with TYC, but this difference was not observed at the protein level, as assessed by Western blot analysis.Conclusions: These findings offer essential data that can be useful in the breeding program of HTBC and future research exploring the role of H-FABP in IMF deposition and regulation in chickens.

英文摘要：

Background： To explore the relationship between the heart-type fatty acid binding protein（H-FABP） gene and intramuscular fat（IMF）, a polymorphism of the second exon of the H-FABP gene was investigated in 60 Three-yellow chickens（TYCs） and 60 Hetian-black chickens（HTBCs）.Results： The IMF contents of the cardiac, chest and leg muscles in HTBC were increased compared with TYC. Both TYC and HTBC populations exhibited Hardy-Weinberg Equilibrium（HWE） according to the χ2test. Three variations of the two birds were detected, namely, G939 A, G982 A and C1014 T. HTBCs with the TT genotypes exhibit increased IMF content in the chest muscles compared with the TC genotype. Thus, the G982 A site could be considered a genetic marker for selecting increased IMF content in the chest muscles of HTBC. The correlation coefficients revealed that H-FABP m RNA expression was negatively correlated with the IMF content in the cardiac, chest and leg muscles of HTBC and in the cardiac and chest muscles of TYC. The relative m RNA expression of H-FABP was reduced in the cardiac and leg muscles of HTBC compared with TYC, but this difference was not observed at the protein level, as assessed by Western blot analysis.Conclusions： These findings offer essential data that can be useful in the breeding program of HTBC and future research exploring the role of H-FABP in IMF deposition and regulation in chickens.