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Molecular biology techniques are important tools for studying animal health and production characteristics. Thus, determining the genotypes of animals with high genetic value enables the implementation of genetic improvement programs, especially related to sperm and testicular characteristics in cattle. The objective of this study was to detect polymorphisms in the promoter region of the FSH-β gene using the Tetra-primer-PCR (T-ARMS-PCR) technique and associate these polymorphisms with seminal parameters and scrotal perimeter in Nellore bulls. Semen samples were collected and evaluated for volume, sperm motility, and vigor, and scrotal perimeter was measured in 200 bulls. DNA extractions and genotyping of the FSH-βU1 and FSH-βU2 polymorphisms were performed using the T-ARMS-PCR technique. Population genetics parameters were estimated, and associations between genotypes and semen and testicular characteristics were assessed. Both SNPs showed variability with allele frequencies close to 0.500 and an excess of heterozygotes (above 0.600). No inbreeding was detected (FIS -0.3304 and -0.2511, respectively), and deviations from Hardy-Weinberg equilibrium were observed (P

This study aimed to determine and evaluate the effect of the g4467 G>A SNP on the expression profile of IFN-γ and miRNA 125b in dairy buffaloes (Bubalus bubalis) with and without hemoparasites. Molecular diagnosis was performed by Polymerase Chain Reaction (PCR) on 145 buffaloes for Babesia spp., Trypanosoma vivax, and Anaplasma marginale. All buffaloes were investigated for the presence or absence of the polymorphism and genotyped using the restriction enzyme. Real-time PCR (RT-qPCR) quantified the expression of IFN-γ and miRNA 125b. All buffaloes were negative for Babesia spp. and A. marginale, and only 12 were positive for T. vivax. The genotypes GG, GA, and AA were found in proportions of 3.4%, 2.1%, and 94.5%, respectively. The A allele was the most frequent (95.5%). The SNP showed deviation from Hardy-Weinberg equilibrium (HWE) (P

Interferon-gamma is an important innate immunomodulatory inflammatory cytokine, whose molecular characterization can demonstrate how this gene may or may not be conserved in populations throughout the evolutionary process. Thus, the study aimed to characterize the 3'-UTR of the Interferon gamma gene and determine its expression profile in the ocular conjunctiva of Amazon buffaloes. For this, blood and ocular conjunctival tissue samples were collected from two hundred and five healthy slaughtered buffaloes in the State of Amapa, Brazil. For the conventional polymerase chain reaction, primers for the 3'UTR region of the Interferon-gamma gene were used and the products were purified, sequenced and edited by comparing the corresponding sequences from buffalo species and other domestic, wild and human mammals. They were aligned and compared using genetic similarity analysis and phylogenetic analysis, using Network 5.0 program and MrBayes, version 3.1.2, respectively. Conjunctival samples were submitted to mRNA quantification of the interferon-gamma to profile gene expression relative to the endogenous gene GAPDH and β-ACTIN. The study demonstrates high-level interferon-gamma genetic similarity between ruminants, with a network of haplotypes forming groups of ruminants, primates, carnivores, bats, cetaceans and isolated individuals such as suiformes and rhinos. Ruminants and cetaceans have a close phylogenetic relationship, while there were different evolutionary distances between buffalo and other mammalian species. The interferon-gamma gene was expressed in all animals in relation to endogenous genes. The results served to better understand the immune system of Amazonian buffaloes and to determine the evolutionary profile in relation to other mammalian species.