|
|
|
Registros recuperados: 34 | |
|
|
SOMAVILLA, A. L.; SONSTEGARD, T. S.; HIGA, R. H.; ROSA, A. do N.; SIQUEIRA, F.; SILVA, L. O. C. da; TORRES JUNIOR, R. A. de A.; COUTINHO, L. L.; MUDADU, M. de A.; ALENCAR, M. M. de; REGITANO, L. C. de A.. |
Brazilian Nellore cattle (Bos indicus) have been selected for growth traits for over more than four decades. In recent years, reproductive and meat quality traits have become more important because of increasing consumption, exports and consumer demand. The identification of genome regions altered by artificial selection can potentially permit a better understanding of the biology of specific phenotypes that are useful for the development of tools designed to increase selection efficiency. Therefore, the aims of this study were to detect evidence of recent selection signatures in Nellore cattle using extended haplotype homozygosity methodology and BovineHD marker genotypes (>777 000 single nucleotide polymorphisms) as well as to identify corresponding... |
Tipo: Artigo de periódico |
Palavras-chave: Single nucleotid; Relative extended haplotype homozygosity; Single nucleotide polymorphisms; Bos Indicus; Beef cattle; Genotyping; Linkage disequilibrium. |
Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/998406 |
| |
|
|
Johnson, Shannon B.; Won, Yong-jin; Harvey, Julio B. J.; Vrijenhoek, Robert C.. |
Background: The inhabitants of deep-sea hydrothermal vents occupy ephemeral island-like habitats distributed sporadically along tectonic spreading-centers, back-arc basins, and volcanically active seamounts. The majority of vent taxa undergo a pelagic larval phase, and thus varying degrees of geographical subdivision, ranging from no impedance of dispersal to complete isolation, often exist among taxa that span common geomorphological boundaries. Two lineages of Bathymodiolus mussels segregate on either side of the Easter Microplate, a boundary that separates the East Pacific Rise from spreading centers connected to the Pacific-Antarctic Ridge. Results: A recent sample from the northwest flank of the Easter Microplate contained an admixture of northern... |
Tipo: Text |
Palavras-chave: Bathymodiolus antarcticus n. sp; Hybridization; Recombination; Linkage disequilibrium; Deep-sea; Hydrothermal vent; Bathymodiolus thermophilus. |
Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00185/29626/28000.pdf |
| |
|
| |
|
|
SOMAVILLA, A. L.; HIGA, R. H.; MUDADU, M. de A.; ALENCAR, M. M. de; REGITANO, L. C. de A.; REDE BIFEQUALI. |
Resumo: O rebanho bovino brasileiro destinado à produção de carne vem sendo selecionado há décadas, por programas de melhoramento genético, para diversas características de crescimento e, mais recentemente, de deposição de gordura. A seleção artificial resulta em alterações no genoma, que podem ser detectadas, por exemplo, por diferenças nos padrões de homozigose dos indivíduos de uma população, permitindo a identificação de regiões do genoma que controlam características sob seleção. Com o objetivo de avaliar a presença de assinaturas de seleção do genoma de bovinos Nelore que continham genes candidatos relacionados com crescimento e deposição de gordura, foram genotipados 796 indivíduos com o chip Illumina BovineHD BeadChip e, posteriormente, inferida a... |
Tipo: Anais e Proceedings de eventos |
Palavras-chave: Assinaturas de seleção; Deposição muscular; Desequilíbrio de ligação; Acabamento; Muscle deposition; Selection signatures.; Gado de Corte.; Linkage disequilibrium; Beef cattle; Finishing. |
Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/946741 |
| |
|
|
O'BRIEN, A. M. P.; UTSUNOMIYA, Y. T.; MÉSZÁROS, G.; BICKHART, D. M.; LIU, G. E.; TASSEL, C. P. V.; SONSTEGARD, T. S.; SILVA, M. V. G. B.; GARCIA, J. F.; SÖLKNER, J.. |
Signatures of selection are regions in the genome that have been preferentially increased in frequency and fixed in a population because of their functional importance in specific processes. These regions can be detected because of their lower genetic variability and specific regional linkage disequilibrium (LD) patterns. By comparing the differences in regional LD variation between dairy and beef cattle types, and between indicine and taurine subspecies, we aim at finding signatures of selection for production and adaptation in cattle breeds. The VarLD method was applied to compare the LD variation in the autosomal genome between breeds, including Angus and Brown Swiss, representing taurine breeds, and Nelore and Gir, representing indicine breeds. The... |
Tipo: Separatas |
Palavras-chave: Cattle - genetic improvement; Indicine; Minor allele frequency.; Linkage disequilibrium; Taurine.. |
Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1006605 |
| |
|
| |
|
|
SOMAVILLA, A. L.; HIGA, R. H.; MUDADU, M. de A.; ALENCAR, M. M. de; REGITANO, L. C. de A.. |
A identificação de regiões do genoma que controlam características de interesse econômico e que estejam sob seleção é possível por conta da disponibilidade da genotipagem em plataformas de altas densidades de polimorfismos de único nucleotídeo (SNPs). A busca por assinaturas de seleção avalia, principalmente, altas e não usuais frequências alélicas dos loci adjacentes às mutações favoráveis. Com o objetivo de detectar evidências de assinaturas de seleção recente no genoma de bovinos da raça Nelore, foram genotipados 796 indivíduos com o chip Illumina BovineHD BeadChip, que possui mais de 777 mil SNPs e, posteriormente, inferida a fase de ligação dos SNPs e a reconstrução dos blocos de desequilíbrio de ligação (haplótipos). A detecção de assinaturas de... |
Tipo: Anais e Proceedings de eventos |
Palavras-chave: Desequilíbrio de ligação; Genotipagem.; Bos Indicus.; Zebu; Genotype; Single nucleotide polymorphism; Linkage disequilibrium. |
Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/946719 |
| |
|
|
Kashiani,Pedram; Saleh,Ghizan; Panandam,Jothi Malar; Abdullah,Nur Ashikin Psyquay; Selamat,Ahmad. |
A study of genetic variation among 10 pairs of chromosomes extracted from 13 tropical sweet corn inbred lines, using 99 microsatellite markers, revealed a wide range of genetic diversity. Allelic richness and the number of effective alleles per chromosome ranged from 2.78 to 4.33 and 1.96 to 3.47, respectively, with respective mean values of 3.62 and 2.73. According to the Shannon's information index (I) and Nei's gene diversity coefficient (Nei), Chromosome 10 was the most informative chromosome (I = 1.311 and Nei = 0.703), while Chromosome 2 possessed the least (I = 0.762 and Nei = 0.456). Based on linkage disequilibrium (LD) measurements for loci less than 50 cM apart on the same chromosome, all loci on Chromosomes 1, 6 and 7 were in equilibrium. Even... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microsatellite; Inbred line; Chromosome; Genetic variation; Linkage disequilibrium. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000400012 |
| |
|
|
MOKRY, F. B.; LIMA, A. O.; MUDADU, M. A.; HIGA, R. H.; MEIRELLES, S. L. C.; SILVA, M. V. B.; CARDOSO, F. F.; NICIURA, S. C. M.; ALENCAR, M. M.; REGITANO, L. C. A.. |
The aim in this study was to descriptively analyze haplotypes from a Canchim beef cattle population. |
Tipo: Anais e Proceedings de eventos |
Palavras-chave: Desequilíbrio de ligação.; Gado.; Cattle; Linkage disequilibrium; Single nucleotide polymorphism. |
Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/946423 |
| |
|
|
MOKRY, F. B.; LIMA, A. O.; MUDADU, M. A.; HIGA, R. H.; MEIRELLES, S. L. C.; SILVA, M. V. B.; CARDOSO, F. F.; NICIURA, S. C. M.; ALENCAR, M. M.; REGITANO, L. C. A.. |
The aim in this study was to descriptively analyze haplotypes from a Canchim beef cattle population. |
Tipo: Parte de livro |
Palavras-chave: Desequilíbrio de ligação.; Gado.; Cattle; Linkage disequilibrium; Single nucleotide polymorphism. |
Ano: 2012 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/967077 |
| |
|
| |
|
|
Marandel, Florianne; Charrier, Gregory; Lamy, Jean-baptiste; Le Cam, Sabrina; Lorance, Pascal; Trenkel, Verena. |
Effective population size (Ne) is a key parameter of population genetics. However, Ne remains challenging to estimate for natural populations as several factors are likely to bias estimates. These factors include sampling design, sequencing method, and data filtering. One issue inherent to the restriction site‐associated DNA sequencing (RADseq) protocol is missing data and SNP selection criteria (e.g., minimum minor allele frequency, number of SNPs). To evaluate the potential impact of SNP selection criteria on Ne estimates (Linkage Disequilibrium method) we used RADseq data for a nonmodel species, the thornback ray. In this data set, the inbreeding coefficient FIS was positively correlated with the amount of missing data, implying data were missing... |
Tipo: Text |
Palavras-chave: Effective population size; Linkage disequilibrium; NeEstimator; RADseq; Skates and rays. |
Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00607/71934/70628.pdf |
| |
|
|
BIEGELMEYER, P.; OLIVEIRA, M. M.; CARDOSO, L. L.; GOMES, C. C. G.; HIGA, R. H.; DIONELLO, N. J. L.; CAETANO, A. R.; STEIBEL, J. P.; CARDOSO, F. F.. |
A set of 41,241 SNP genotypes from 2,435 Hereford (HH) and Braford (BO) bovines were analyzed to estimate linkage disequilibrium (LD) levels, persistence of phase and effective population size of these populations. LD levels were estimated using the squared correlation of alleles at two loci (r2) at varying distances. Average r2 between adjacent SNP was 0.21 for HH and 0.16 for BO. Average inter-marker distance was 61 kb in both breeds. Useful LD values (r2>0.2) were observed at 0-60 kb bins in HH and 0-20 kb bins in BO. Breeds demonstrated moderate to strong persistence of phase at all distances (range=0.53-0.97). The greatest phase correlations (r>0.9) were found in 0-50 kb bins. LD estimates decreased rapidly with increasing distances between... |
Tipo: Anais e Proceedings de eventos |
Palavras-chave: Desequilíbrio de ligação; Tamanho populacional; Persistence of phase; Gado de corte; Beef cattle; Linkage disequilibrium; Population size. |
Ano: 2014 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1003699 |
| |
|
|
Wang,Xiao-Qiang; Kwon,Soon-Wook; Park,Yong-Jin. |
Background: In order to evaluate the variation among different rice types, the genetic diversity in a rice collection composed by 59 breeding lines, 23 landraces, 18 weedy rice lines, and 35 introduced lines that collected from countries worldwide was analyzed using 134 simple sequence repeat markers. Results: In total, 1264 alleles were identified (average, 9.43 per locus). Rare alleles made up a large portion (58.4%) of the detected alleles, and 29 unique alleles associated with rice accessions were also discovered. A model-based structural analysis revealed the presence of three subpopulations. The genetic relationships revealed by the neighbour-joining tree method were fairly consistent with the structure-based membership assignments for most of the... |
Tipo: Journal article |
Palavras-chave: Landraces; Linkage disequilibrium; Population structure; Rice; Simple sequence repeats. |
Ano: 2013 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582013000500011 |
| |
|
| |
|
| |
|
| |
|
| |
|
|
REGITANO, L. C. de A.; VERARDO, L. L.; SILVA, F. F. e; MACHADO, M. A.; PANETTO, J. C. do C.; REIS, D. R. de L.; OTTO, P. I.; SILVA, M. V. G. B.; ZANELLA, R.; ALBUQUERQUE, M. do S. M.; EGITO, A. A. do; SILVA, L. O. C. da. |
Cattle population history, breeding systems, and geographic subdivision may be reflected in runs of homozygosity (ROH), effective population size (Ne), and linkage disequilibrium (LD) patterns. Thus, the assessment of this information has become essential to the implementation of genomic selection on purebred and crossbred cattle breeding programs. In this way, we assessed the genotype of 19 cattle breeds raised in Brazil belonging to taurine, indicine, synthetic crossbreds, and Iberian-derived locally adapted ancestries to evaluate the overall LD decay patterns, Ne, ROH, and breed composition. We were able to obtain a general overview of the genomic architecture of cattle breeds currently raised in Brazil and other tropical countries. We found that, among... |
Tipo: Artigo de periódico |
Palavras-chave: Rusticidade; Rusticity; Bovino; Gado; Genética Animal; Genoma; Produção Leiteira; Comportamento Animal; Fertilidade Animal; Homozygosity; Population size; Linkage disequilibrium; Milk production; Animal behavior; Animal fertility. |
Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133730 |
| |
|
|
Dias,Douglas Antônio; Polo,Leandra Regina Texeira; Lazzari,Fabiane; Silva,Glacy Jaqueline da; Schuster,Ivan. |
Abstract: The objective of this work was to identify single-nucleotide polymorphism (SNP) markers linked with quantitative trait loci (QTLs) associated with increased contents of protein and oil in soybean. A total of 169 Brazilian soybean varieties, genotyped with 6,000 SNP markers, were evaluated. Protein and oil contents were obtained with the near-infrared reflectance method. Correlation and multiple linear regression analyses were used to identify linkage disequilibrium between SNP markers and the QTLs associated with the two characteristics. Seven QTLs were found to be associated with protein content, on six chromosomes (2, 6, 11, 12, 13, and 16), explaining 60.9% of the variation in this trait. For oil content, eight QTLs were identified on six... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glycine max; Association genetics; Genomic selection; Grain quality; Linkage disequilibrium; Marker-assisted selection.. |
Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001000896 |
| |
Registros recuperados: 34 | |
|
|
|