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| Registros recuperados: 21 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Lin,Yu; Liu,Shihang; Liu,Yaxi; Liu,Yujiao; Chen,Guoyue; Xu,Jie; Deng,Mei; Jiang,Qiantao; Wei,Yuming; Lu,Yanli; Zheng,Youliang. |
| Abstract Pre-harvest sprouting (PHS) is a major abiotic factor affecting grain weight and quality, and is caused by an early break in seed dormancy. Association mapping (AM) is used to detect correlations between phenotypes and genotypes based on linkage disequilibrium (LD) in wheat breeding programs. We evaluated seed dormancy in 80 Chinese wheat founder parents in five environments and performed a genome-wide association study using 6,057 markers, including 93 simple sequence repeat (SSR), 1,472 diversity array technology (DArT), and 4,492 single nucleotide polymorphism (SNP) markers. The general linear model (GLM) and the mixed linear model (MLM) were used in this study, and two significant markers (tPt-7980 and wPt-6457) were identified. Both markers... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: General linear model; Linkage disequilibrium; Marker-trait associations; Mixed linear model; Seed dormancy. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000400620 |
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| Owczarek,Catherine M.; Owczarek,Aleksander L.; Board,Philip G.. |
| Human alpha1-acid glycoprotein (AGP) or orosomucoid (ORM) is a major acute phase protein that is thought to play a crucial role in maintaining homeostasis. Human AGP is the product of a cluster of at least two adjacent genes located on HSA chromosome 9. Using a range of restriction endonucleases we have investigated DNA variation at the locus encoding the AGP genes in a panel of healthy Caucasians. Polymorphisms were identified using BamHI, EcoRI, BglII, PvuII, HindIII, TaqI and MspI. Non-random associations were found between the BamHI, EcoRI, BglII RFLPs. The RFLPs detected with PvuII, TaqI and MspI were all located in exon 6 of both AGP genes. The duplication of an AGP gene was observed in 11% of the indiviuals studied and was in linkage disequilibrium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Human alpha1-acid glycoprotein; RFLP; Linkage disequilibrium. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572002000100004 |
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| Branco,Claudia C.; Pacheco,Paula R.; Cabrol,Ester; Cabral,Rita; Vicente,Astrid M.; Mota-Vieira,Luisa. |
| Studies on linkage disequilibrium (LD) across the genome and populations have been used in recent years with the main objective of improving gene mapping of complex traits. Here, we characterize the patterns of genetic diversity of HLA loci and evaluate LD (D') extent in three genomic regions: Xq13.3, NRY and HLA. In addition, we examine the distribution of DXS1225-DXS8082 haplotype diversity in Azoreans and mainland Portuguese. Allele distribution has demonstrated that the São Miguel population is genetically very diverse; haplotype analysis revealed 100% discriminatory power for X- and Y-markers and 94.3% for HLA markers. Standardized multiallelic D' in these three genomic regions shows values lower than 0.33, thereby suggesting there is no extensive LD... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Linkage disequilibrium; X-chromosome; Y-chromosome; HLA; São Miguel; Azores. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572009000200003 |
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| Jemaa,Slim Ben; Thamri,Nejia; Mnara,Sofiane; Rebours,Emmanuelle; Rocha,Dominique; Boussaha,Mekki. |
| Abstract To carry out effective genome-wide association studies, information about linkage disequilibrium (LD) is essential. Here, we used medium-density SNP chips to provide estimates of LD in native Tunisian cattle. The two measures of LD that were used, mean r2 and D’, decreased from 0.26 to 0.05 and from 0.73 to 0.40, respectively, when the distance between markers increased from less than 20 Kb to 200 Kb. The decay in LD over physical distance occurred at a faster rate than that reported for European and other indigenous breeds, and reached background levels at less than 500 Kb distance. This is consistent with the absence of strong selective pressure within the Tunisian population and suggests that, in order to be effective, any potential genome-wide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tunisian cattle; Conservation; Linkage disequilibrium; Effective population size; Single nucleotide polymorphism. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000100052 |
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| Bejarano,Diego; Martínez,Rodrigo; Manrique,Carlos; Parra,Luis Miguel; Rocha,Juan Felipe; Gómez,Yolanda; Abuabara,Yesid; Gallego,Jaime. |
| Abstract The linkage disequilibrium (LD) between molecular markers affects the accuracy of genome-wide association studies and genomic selection application. High-density genotyping platforms allow identifying the genotype of thousands of single nucleotide polymorphisms (SNPs) distributed throughout the animal genomes, which increases the resolution of LD evaluations. This study evaluated the distribution of minor allele frequencies (MAF) and the level of LD in the Colombian Creole cattle breeds Blanco Orejinegro (BON) and Romosinuano (ROMO) using a medium density SNP panel (BovineSNP50K_v2). The LD decay in these breeds was lower than those reported for other taurine breeds, achieving optimal LD values (r2 ≥ 0.3) up to a distance of 70 kb in BON and 100... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Creole breeds; BovineSNP50; Linkage disequilibrium; Minor allele frequency. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572018000300426 |
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| Baiotto,Cléia; Sperb,Fernanda; Matte,Ursula; Silva,Cláudia Dornelles da; Sano,Renata; Coelho,Janice Carneiro; Giugliani,Roberto. |
| Infantile GM1 gangliosidosis is caused by the absence or reduction of lysosomal beta-galactosidase activity. Studies conducted in Brazil have indicated that it is one of the most frequent lysosomal storage disorders in the southern part of the country. To assess the incidence of this disorder, 390 blood donors were tested for the presence of two common mutations (1622-1627insG and R59H) in the GLB1 gene. Another group, consisting of 26 GM1 patients, and the blood donors were tested for the presence of two polymorphisms (R521C and S532G), in an attempt to elucidate whether there is a founder effect. The frequencies of the R59H and 1622-1627insG mutations among the GM1 patients studied were 19.2% and 38.5%, respectively. The frequency of polymorphism S532G... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: GM1 gangliosidosis; Beta-galactosidase; GLB1 gene; Founder effect; Linkage disequilibrium. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572011000100009 |
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| Araújo,Karine Lourenzone; Rezende,Lucas Cunha Dias de; Souza,Letícia Soncini; Daltoé,Renata Dalmaschio; Madeira,Klesia Pirola; Paes,Marcela Ferreira; Herkenhoff,Fernando Luiz; Rangel,Letícia Batista Azevedo; Silva,Ian Victor. |
| The aim of this work was to study the estrogen receptor alpha (ERS1) PvuII and XbaI gene polymorphisms prevalence in randomly selected women population from Rio de Janeiro and Espírito Santo states in Brazil by polymerase chain reaction restriction fragment lengths polymorphism (PCR_RFLP) methodology. It was shown that Rio de Janeiro women exhibited a significantly different prevalence of XbaI polymorphism comparing to Espirito Santo women. Nonetheless, similar prevalence of PvuII polymorphism was found in both women´s populations. Moreover, a strong linkage disequilibrium was observed between these SNPs reinforcing the hypothesis of differential pattern of inheritance observed on such populations. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Polymorphism; Estrogen Receptor; Brazilian Women; Prevalence; Linkage disequilibrium. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000600010 |
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| Stoeckel, Solenn; Arnaud-haond, Sophie; Krueger-hadfield, Stacy A; Orive, Maria. |
| Partial clonality is known to affect the genetic composition and evolutionary trajectory of diplontic (single, free-living diploid stage) populations. However, many partially clonal eukaryotes exhibit life cycles in which somatic development occurs in both haploid and diploid individuals (haplodiplontic life cycles). Here, we studied how haplodiplontic life cycles and partial clonality structurally constrain, as immutable parameters, the reshuffling of genetic diversity and its dynamics in populations over generations. We assessed the distribution of common population genetic indices at different proportions of haploids, rates of clonality, mutation rates, and sampling efforts. Our results showed that haplodiplontic life cycles alone in finite populations... |
| Tipo: Text |
Palavras-chave: Mating system; Asexuality; Genetic and genotypic diversity; Life cycle; Linkage disequilibrium; FIS. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00684/79593/82282.pdf |
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| Registros recuperados: 21 | |
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