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| Author(s): |
Fernando de Oliveira Bussiman
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Zootecnica e Engenharia de Alimentos (FZE/BT) |
| Defense date: | 2018-12-13 |
| Examining board members: |
Júlio César de Carvalho Balieiro;
Rachel Santos Bueno Carvalho;
Fernanda Nascimento de Godoi;
Ricardo Vieira Ventura
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| Advisor: | Júlio César de Carvalho Balieiro; Rogério Abdallah Curi |
| Abstract | |
The DMRT3 gene has been described as the main gene to act in gait determination in several equine breeds. The allele A of the SNP 23:g.22999655C>A of DMRT3 gene was identified as responsible for this trait. In the Brazilian Mangalarga Marchador breed, which presents two gait patterns with characteristics well defined, the AA and CA genotypes have been associated with marcha picada gait and CC genotype with marcha batida gait. The general aim of this study was to prospect genomic regions associated with marcha batida and marcha picada gaits in Mangalarga Marchador equines. 1,230 phenotypic data were used on the type of gait (marcha batida N = 1.006; marcha picada N = 227) and, considering the totality of known genealogy for each animal, 3,172 animals in the pedigree. Firstly, modelling strategies were tested for this trait in order to determine the effects to be considered in the model, as well as the best form of inclusion (fixed or random effect). Based on the best modelling strategy to be used, the relationship between the allelic and genotypic frequencies of the DMRT3 gene with kinship and inbreeding patterns was studied according to each type of gait. A single-step wide genomic association study (considering information from both genotyped and non-genotyped animals simultaneously) was conducted to verify genomic regions, single nucleotide polymorphisms and genes related to determination of gait type in Mangalarga Marchador horses. Twenty two single nucleotide polymorphisms located on chromosomes 4 (N = 5), 6 (2), 16 (1), 23 (11), 26 (1) and 29 (2) were responsible for 42.43% of the additive genetic variance. 69 genes were associated with gait type, but about 39 were not annotated in horses. A blast was conducted in order to recover the most likely function of these genes. Eight metabolic pathways were found associated with gait type and the main genes involved were related to the perception of external stimuli, energy-oxidative metabolism, immune system and learning and rhythm of locomotion. It was not possible to identify the causal variant(s) of the type of gait; however, this study was the first and to verify that the possible genetic determination of gait type in Mangalarga Marchador horses goes through differences in the metabolic levels that guarantee the adaptation of the animals to the type of gait. (AU) | |
| FAPESP's process: | 16/17834-0 - Genome-Wide Association Study for genetics differences between the batida and picada gaits in Mangalarga Marchador equine |
| Grantee: | Fernando de Oliveira Bussiman |
| Support Opportunities: | Scholarships in Brazil - Master |