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Effect of G2548A polymorphism in the leptin gene on the BMI level in human population
Published February 18, 2016
5-10

The polymorphism in leptin (LEP 2548A) seems to influence obesity among others genes. The aim of this study is to investigate the effect of the G2548A polymorphism on body mass index. We included 79 people from Slovakia with some genetic relatedness and used barrels kit to isolate the genomic DNA from an adenoblast swab- from the salivary. PCR ...products were amplified by pursued polymorphisms and G2548A, we restriction-analyzed them and then we identified the specific fragments describing the presence of chosen SNP polymorphism by the agarose electrophoresis, to analyze SNP polymorphism by PCR-RFLP method.

The LEP gene had increased frequency of G allele (0.5506). The most common genotype occurring in the gene LEP was heterozygous genotype (AG) and the least frequent genotype in LEP was AA (0.1899). Taking the age into account the BMI is higher if the G allele occurs in the LEP gene. Moreover, if the G allele genotype was situated in dominant form, then the highest average BMI was present.

According to the results we can assume that the AA genotype (LEP) has a protective effect on the prevalence of obesity compared to the other genotypes.

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Associations analysis of production traits with leptin gene T3469C polymorphisms in pig
Published February 10, 2013
39-43

...5); font-variant-ligatures: normal; font-variant-caps: normal; -webkit-text-stroke-width: 0px; text-decoration-style: initial; text-decoration-color: initial;">The aim of this study was to define the connection between the leptin (LEP) gene T3469C polymorphism and its potential association with production traits in improved hybrid pigs. The study included data from 397 gilts and barrows from 2 different sample. The polymorphism was identified by using the polymerase chain reaction-restriction fragment-length polymorphism (PCR–RFLP) method with HinfI restriction enzyme. Two alleles of LEP gene were identified: T (0.93) an C (0.07). The analysis of values of production traits, depending on LEP genotype did not reveal significant (P≤0.05) differences. In the examination the loin diameter (between the 2nd and 3rd ribs), the live weight at slaughter and the averege daily gain during fattening were higher at pigs with C allele than pigs with TT genotipe. Accordingt to our data the effect of C allele was favourable in this population, because these animals had bigger bodyweight without valuable change of lean meat percent.

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Examination of the interval between litters (IBL) of different genotype HLW sows using survival analysis
Published October 24, 2016
13-17

In this study our aim was to find out if there is a difference between the genotypes determined for the previously identified mutations of seven genes of the Hungarian Large White in terms of the time spent in production. We identified the previously determined alleles of the seven genes (BF, EGF, ESR, FSHβ, H2AFZ, LEP, PRLR) related to prolif...eration that were and performed the survival analysis between breeds indicating the risk of culling and the time spent in production on the given farm. Based on the results of survival analysis by Log-rank test, Breslow (Generalized Wilcoxon) and Tarone-Ware test we concluded that they indicated a significant difference in case of the genes BF (Breslow and Tarone-Ware tests) the EGF (Log-rank and Tarone-Ware tests) and ESR (Log rank test) based on which the curves of the survival of the certain genes varied form one another significantly.

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Brief overview of the polymorphism analysis of genes affecting pig prolificacy (LEP, PRLP, ESR BF, EGF, FSH-β, H2A.Z)
Published March 24, 2015
5-10

Researches are being performed around the world to increase swine prolificacy by using marker-assisted selection (MAS). The present study processes researches of polymorphism examinations on 7 genes. The result of the experiments showed that the leptin gene (LEP) prolactin receptor gene (PRLP), estrogen receptor gene (ESR), properdin B (BF) epi...dermal growth factor (EGF), follicle-stimulating beta gene (FSH-ß) and Z member of the H2A histon family gene (H2A.Z) and their alleles have a positive effect on reproductive characteristics of different swine breeds. In addition to this, leptin gene (LEP) influences the build, meat production and growth of body fat. Further studies are concerned with the polymorphism of an increasing number of genes, which enables a faster genetic development of swine breeding.

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Polymorphism of the bovine GH and LEP genes in a population of Slovak spotted bulls
Published November 20, 2011
19-23

The aim of this study was the detection of polymorphism in the bovine growth hormone and leptin genes using the PCR-RFLP method. A
polymorphic site of the growth hormone gene (Alul loci) that results in amino acid change at position 127 of the protein chain (leucine, L to
valine, V) has been linked to differences in circulating metabolite...s, metabolic hormones and to milk yield. The polymorphism in bovine leptin
gene is situated in the intron between two exons, which results in an amino acid change at position 2059 of the protein chain (cytosine, C to
thymine, T). The polymorphisms were studied in a group of 58 bulls of the Slovak spotted breed. A strategy employing PCR was used to amplify 428 bp (GH gene) and 422 bp (LEP gene) products from blood samples. Digestion of PCR products with restriction enzymes AluI and Sau3AI revealed alleles: L and V; A and B for GH gene and LEP gene, respectively. The growth hormone gene is a candidate gene for body weight gain in cattle, since it plays a fundamental role in growth regulation. Leptin plays an important role in the regulation of feed intake, energy metabolism, growth and reproduction of cattle; therefore, animals with higher leptin gene expression will probably have lower daily weight gain than others with similar forage offer and nutritional condition and will also likely have longer calving intervals. 

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