Effect of PPARGC-1 gene on backfat thickness in pigs | Povezava gena PPARGC-1 z debelino hrbtne slanine

English. PPARGC-1 gene is assumed to be a candidate gene with a major effect on fatness and meat quality. In this study, frequency of T/A substitution at position 1378 in PPARGC-1 gene in pigs was examined in boars of 4 different breeds. Frequency of genotypes and alleles were compared between animals with the thinnest and with the thickest backfat. Differences in genotype frequency between groups were significant in dam line of Slovenian Landrace (SL11) and sire line of Large White breed (LW66). Allele A was predominantly present in animals with thick backfat in SL11 (71.05%), LW66 (58%) and in sire line of Slovenian Landrace (67.65%). Differences in allele frequency were significant in SL11. We found a significant effect on phenotypic and breeding values for backfat in population of Large White breeds, where homozygotes TT had the thickest backfat, and heterozygotes the thinnest. In population of Slovenian Landrace breed the thickest backfat had homozygotes AA and the thinnest homozygotes TT. Similar results were obtained by analysis of gene effect on breeding values. Inconsistency could be explained by different background of allele, epistasis and intensity of selection.

Slovenian. Gen za PPARGC-1 je kandidatni gen z velikim učinkom na zamaöčenost in kvaliteto mesa. V prispevku smo preučevali frekvence točkovnih mutacij A → T na mestu 1378 v 8. eksonu gena za PPARGC-1 pri merjascih ötirih različnih linij dveh pasem. Frekvence genotipov in alel smo primerjali med merjasci s tanjöo (skupina A) ter merjasci z debelejöo hrbtno slanino (DHS), (skupina B). Razlike v frekvencah genotipov so bile značilne med skupinama merjascev pri maternalni liniji pasme slovenska landrace (SL11) ter pri terminalni liniji pasme large white (LW66). Alela A je bila pogostejöa pri ûivalih z debelejöo DHS pri SL11 (71,05 %), LW66 (58 %) ter pri terminalni liniji pasme slovenska landrace (67,65 %). Razlike v frekvencah alel so bile značilne v populaciji SL11. Genotip je značilno vplival na DHS v populacijah LW11 in LW66, kjer so imeli debelejöo slanino homozigoti TT in tanjöo heterozigoti. V populacijah SL11 in SL55 so imeli najdebelejöo slanino genotipi AA in najtanjöo slanino homozigoti TT.Nasprotujoči rezultati so lahko posledica genetskega ozadja alel, epistaze in intenzivnosti selekcije.