IGF2-in3-G3072A is a causative mutation for paternally expressed quantitative trait loci on the p arm of porcine chromosome 2 with substantial effect on muscle growth and backfat thickness. The linkage disequilibrium between IGF2-in3-G3072A and IGF2-in7-G162C (IGF2-NciI) in four breeds and associations between these polymorphisms and growth and meat performance in pigs of the Large White breed were analysed. A significant effect of these polymorphisms on backfat thickness and lean meat content was found. In addition, we identified two new single nucleotide polymorphisms (SNPs) in intron 7 of the gene. The existence of complete linkage disequilibrium between IGF2-in3-G3072A locus in the population under study where the locus segregated and SNPs in intron 7 of the IGF2 gene detectable with simple and reliable polymerase chain reaction-restriction fragment length polymorphism techniques (G162C, C179G and G186T) offer possibilities to use these SNPs for genotyping of quantitative trait nucleotide in Large White and Landrace breeds.
Perilipin, encoded by the PLIN gene, is a lipid droplet-associated phosphoprotein that functions as a key regulator of triacylglycerol storage and hydrolysis in adipocytes. In this study, structure and variability of the porcine PLIN gene were characterised. PCR fragments encompassing exons 1 to 9 and interspersed introns were sequenced and the obtained sequence was deposited in EMBL/GenBank/DDBJ databases (AM931171). Seven silent polymorphisms and one nonsynonymous polymorphism were detected in the coding sequence. The nonsynonymous polymorphism g.627G>A causing an amino acid substitution p.Val3Ile was found only in Meishan and Meishan × Piétrain cross. Associations were studied between loci g.4119A>G and g.7966T>C, and average daily gain (ADG), backfat thickness (BFT) or lean meat content (LMC) in 166 gilts from two herds. Due to supposed complete linkage disequilibrium between loci g.4119A>G and g.7966T>C only genotype combinations AA-TT, AG-TC and GG-CC were detected. A significant difference (P = 0.0290) between GG-CC and AG-TC genotype combinations for BFT in herd 2 and a suggestive difference (P = 0.0516) between GG-CC and AA-TT genotypes for ADG in herd 1 were detected.
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