SUMMARY. The associations between SNP in leptin gene (LEP g.2845A>T, LEP g.3996T>C, LEP g.3469T>C) and lep-tin receptor gene (LEPR c.232A>T, LEPR c.2856C>T, LEPR c.915C>T) and the meat quality traits of Ukrainian Large White pigs (ULW) were studied. The computational analysis (SIFT, PolyPhen-2 and I-Mutant bioinformational services) was conducted to investigate the effect of mutations, causing SNP, for both selected SNP, and those missense SNP, for which they can be potential linkage disequilibrium (LD) markers, on the structure and functions of leptin and leptin receptor. LEP SNP c.3469T>C (exon 3, rs45431504) is associated with the protein content in meat and the content of moisture in the back fat. LEP SNP g.2845A>T (rs344615147), which is associated with moisture-retaining ability of meat and the content of moisture in the back fat, is located in the second intron and, similar to SNP c.3469T>C, may be viewed as an LD marker of missense-polymorphism of SNP LEP rs701423985. LEPR SNP c.232A>T (exon 4, rs45435517) is a missense mutation, causing the amino acid replacement S52I. The evaluations, made using SIFT and PolyPhen-2, demonstrate a considerable impact of rs45435517 on the functional characteristics of leptin receptor. Our study determined the association between SNP c.232A>T and fat thickness. At the same time, SNP c.2856C>T (exon 20, rs694660564, a synonymic replacement), which in our work demonstrated the association with the loss of moisture in meat for ULW pigs, may be a potential LD marker and be in disequilibrium with the linkage to missense SNP LEPR rs1113972516, rs792804682 and rs1109261799. SNP, for which in our work the associations were found with meat quality traits, may be viewed as potential markers for the breeding of ULW pigs and possibly other breeds, directed at obtaining genotypes with improved characteristics of meat quality.
Keywords: pigs, leptin gene, leptin receptor gene, SNP, meat quality traits, association, computational analysis of SNP effects
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