[Show abstract][Hide abstract] ABSTRACT: We assessed the effects of single-nucleotide polymorphisms (SNPs) within the porcine fatty acid synthase (FASN) gene
regarding meat quality and fatty acid composition in two pig populations: Korean native pigs (KNP) were crossed with
Yorkshire (YS) F2, and KNP were crossed with Landrace (LR) F2. Direct DNA sequencing using eight KNP and eight YS
pigs revealed two SNPs: c.265C>T (silent) in exon 4 and c.6545A>C (Asn→His) in exon 39. The frequency of the two
SNPs was analyzed using the polymerase chain reaction-restriction fragment length polymorphism method in seven pig
breeds and their association with meat quality traits and fatty acid composition was studied. In the KNP × YS F2 population,
both SNPs were significantly associated with the level of monounsaturated fatty acids, including palmitoleic (C16:1) and
oleic acid (C18:1) (p<0.005). c.6545A>C was associated with intramuscular fat content in both populations. Our results
indicate that variations in c.265C>T and c.6545A>C of the pig FASN can be used to select animals with better fatty acid
composition and meat quality. Moreover, KNP was a useful breed for identifying genetic factors affecting meat quality and
fatty acid composition and for producing high quality pork.
Hangug chugsan sigpum haghoeji = Korean journal for food science of animal resources 03/2011; 31(3):356-365. · 0.25 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Porcine chromosome 6 (SSC6) has been reported to have QTL affecting intramuscular fat content (IMF) in multiple populations. The objective of this study was to investigate the effect of FABP3 and LEPR genetic variations as well as their mRNA expression on the IMF trait in a three-generation of Korean native pig and Yorkshire crossed animals. Several polymorphisms of the FABP3 (HinfI, HaeIII and HinfI*) were significantly associated with moisture, tenderness and flavor score (P < 0.05), and were used to construct haplotypes: haplotype 1 (-TCT-) increased the marbling and intramuscular fat content, however, haplotype 2 (-CCT-) decreased tenderness. The LEPR AvaII polymorphism showed significant association with moisture, intramuscular fat, cholesterol and flavor score (P < 0.05). The linkage analyses with six microsatellites mapped FABP3 gene in the interval between the markers Sw1129 and S0228 (Sw1129--11.7 cM--FABP3-9.1 cM--S0228), and the LEPR gene between the markers S0121 and Sw322 (S0121--7.5 cM--LEPR--28.5 cM--Sw322). QTL mapping suggested a significant QTL affecting Moisture (83 cM) and IMF (84 cM) located close to marker S0228. The gene expression results showed that in the loin muscle, both of the FABP3 and LEPR genes showed significantly higher expression in pigs with higher IMF%, however, in the backfat, only FABP3 showed differential expression between these two groups of pigs (significantly higher expression in pigs with lower IMF%) (P < 0.05). In the liver, both of these two genes did not show any difference between the high and low IMF% groups.