Examinando por Materia "Microsatellite"

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A microsatellite study on the genetic distance between suri and huacaya phenotypes in peruvian alpaca (Vicugna pacos)
(2012-01) La Manna, Vincenzo; La Terza, Antonietta; Dharaneedharan, S.; Ghezzi, Silvia; Arumugam Saravanaperumal, S.; Apaza, Nolberto; Huanca Mamani, Teodosio; Bozzi, Riccardo; Renieri, Carlo
Two coat phenotypes exist in alpaca: the Huacaya and the Suri. The two coats have different textile characteristics and different prices on the market. Although present scientific knowledge suggests a simple genetic model of inheritance, there is a tendency to manage and consider the two phenotypes as two different breeds. A 14-microsatellite panel was used in this study to assess genetic distance between Suri and Huacaya alpacas in a sample of non-related animals from two phenotypically pure flocks at the Illpa-Puno experimental station in Quimsachata. Peru. The animals are part of a germplasm established approximately 20 years ago and have been bred separately according to their coat type since then. Genetic variability parameters were also calculated. The codominant data was statistically analysed using the software Genalex 6.3, Phylip 3.69 and Fstat 2.9.3.2. The sample was tested for Hardy-Weinberg equilibrium (HWE) and after strict Bonferroni correction only one locus (LCA37) showed deviation from equilibrium (P<0.05). Linkage disequilibrium (LD) was also tested and 9 loci associations showed significant disequilibrium. Observed heterozygosis (Ho= 0.766; SE=0.044), expected heterozygosis (He=0.769; SE=0.033), number of alleles (Na=9.667, SE=0.772) and Fixation index (F=0.004; SE=0.036) are comparable to data from previous studies. Measures of genetic distance were 0.06 forNei’s and 0.03 for Cavalli-Sforza’s. The analysis of molecular variance reported no existing variance between populations. Considering the origin of the animals, their post domestication evolution and the reproductive practices in place, the results suggest that there is no genetic differentiation between the two populations for the studied loci.
Analysis of genetic distance between Peruvian Alpaca (Vicugna Pacos) showing two distinct fleece phenotypes, Suri and Huacaya, by means of microsatellite markers
(Taylor & Francis, 2016-02-19) La Manna, Vincenzo; La Terza, Antonietta; Ghezzi, Silvia; Saravanaperumal, Siva; Apaza, Nolberto; Huanca Mamani, Teodosio; Bozzi, Riccardo; Renieri, Carlo
Two coat phenotypes exist in Alpaca, Huacaya and Suri. The two coats show different fleece structure, textile characteristics and prices on the market. Although present scientific knowledge suggests a simple genetic model of inheritance, there is a tendency to manage and consider the two phenotypes as two different breeds. A 13 microsatellite panel was used in this study to assess genetic distance between Suri and Huacaya alpacas in a sample of non-related animals from two phenotypically pure flocks at the Illpa-Puno experimental station in Quimsachata, Peru. The animals are part of a germplasm established approximately 20 years ago and have been bred separately according to their coat type since then. Genetic variability parameters were also calculated. The data were statistically analyzed using the software Genalex 6.3, Phylip 3.69 and Fstat 2.9.3.2. The sample was tested for Hardy-Weinberg equilibrium (HWE) and after strict Bonferroni correction only one locus (LCA37) showed deviation from equilibrium (P<0.05). Linkage disequilibrium (LD) was also tested and 9 loci associations showed significant disequilibrium. Observed heterozygosis (Ho= 0.766; SE=0.044), expected heterozygosis (He=0.769; SE=0.033), number of alleles (Na=9.667, SE=0.772) and Fixation index (F=0.004; SE=0.036) are comparable to data from previous studies. Measures of genetic distance were 0.06 for Nei’s and 0.03 for Cavalli-Sforza’s. The analysis of molecular variance reported no existing variance between populations. Considering the origin of the animals, their post domestication evolution and the reproductive practices in place, the results do not show genetic differentiation between the two populations for the studied loci.
Genetic diversity and validation of a microsatellite panel for parentage testing for alpacas (Vicugna pacos) on three Peruvian farms
(El Sevier, 2020-09-22) Morón, J. A.; Veli Rivera, Eudosio Amancio; Membrillo, A.; Paredes, M. M.; Gutiérrez Reynoso, Gustavo Augusto
The alpaca is of greatest economic importance in the Peruvian High Andes. This study aimed to determine the genetic diversity of three Peruvian alpaca farms, as well as, to validate a microsatellite markers panel for paternity testing. In this study, 247 samples of Huacaya alpacas were taken from three different localities (Sanjo, San Pedro de Raco and Cachipampa) from Pasco Region in Peru. DNA was obtained from hair follicles and genotyped for 15 microsatellites markers in multiplex electrophoresis runs.A total of 225 alleles were detected across the 15 loci investigated. The polymorphism information content considering all loci was 0.82, which indicated that the microsatellite panel was very polymorphic and highly informative. The estimated diversity parameter showed that farms have high levels of genetic diversity (HE = 0.826), and revealed the existence of genetic differentiation among the farms (FST = 2.8 %). The highest inbreeding coefficient was in the Sanjo farm (FIS = 0.303). The results of the parentage testing indicated that all loci showed values greater than 70 % probability of discrimination. However, the highest values found were 94 % (YWLL08) and 90 % (YWLL36). The average of the probability of exclusion obtained was 0.999994 if the genotype for one alleged parents is known, and 0.99999 if the genotypes for both alleged parents are known. The results obtained show that there is a high genetic diversity and validate the panel of microsatellite markers, that would help to improve the identification system and genealogical data collection.