scholarly journals Evaluation of imputation accuracy using the combination of two high-density panels in Nelore beef cattle

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Priscila Arrigucci Bernardes ◽  
Guilherme Batista do Nascimento ◽  
Rodrigo Pelicioni Savegnago ◽  
Marcos Eli Buzanskas ◽  
Rafael Nakamura Watanabe ◽  
...  
Keyword(s):  
Linkage Disequilibrium ◽  
Beef Cattle ◽  
Haplotype Block ◽  
Imputation Accuracy ◽  
High Density ◽  
Low Density ◽  
Common Snps ◽  
Haplotype Blocks ◽  
Genome Wide ◽  
Trait Locus

AbstractThis study compared imputation from lower-density commercial and customized panels to high-density panels and a combined panel (Illumina and Affymetrix) in Nelore beef cattle. Additionally, linkage disequilibrium and haplotype block conformation were estimated in individual high-density panels and compared with corresponding values in the combined panel after imputation. Overall, 814 animals were genotyped using BovineHD BeadChip (IllumHD), and 93 of these animals were also genotyped using the Axion Genome-Wide BOS 1 Array Plate (AffyHD). In general, customization considering linkage disequilibrium and minor allele frequency had the highest accuracies. The IllumHD panel had higher values of linkage disequilibrium for short distances between SNPs than AffyHD and the combined panel. The combined panel had an increased number of small haplotype blocks. The use of a combined panel is recommended due to its increased density and number of haplotype blocks, which in turn increase the probability of a marker being close to a quantitative trait locus of interest. Considering common SNPs between IllumHD and AffyHD for the customization of a low-density panel increases the imputation accuracy for IllumHD, AffyHD and the combined panel.

Genome-wide linkage disequilibrium in two Japanese beef cattle breeds

2006 ◽  
Vol 37 (2) ◽  
pp. 139-144 ◽  
Author(s):  
M. Odani ◽  
A. Narita ◽  
T. Watanabe ◽  
K. Yokouchi ◽  
Y. Sugimoto ◽  
...  
Keyword(s):  
Linkage Disequilibrium ◽  
Beef Cattle ◽  
Cattle Breeds ◽  
Genome Wide ◽  
Beef Cattle Breeds ◽  
Genome Wide Linkage Disequilibrium

scholarly journals Haplotype-Based Genome-Wide Association Study and Identification of Candidate Genes Associated with Carcass Traits in Hanwoo Cattle

Genes ◽  
2020 ◽  
Vol 11 (5) ◽  
pp. 551
Author(s):  
Swati Srivastava ◽  
Krishnamoorthy Srikanth ◽  
Sohyoung Won ◽  
Ju-Hwan Son ◽  
Jong-Eun Park ◽  
...  
Keyword(s):  
Association Study ◽  
Candidate Genes ◽  
Haplotype Block ◽  
Genome Wide Association Study ◽  
Carcass Traits ◽  
Gene Set Enrichment Analysis ◽  
Genome Wide Association ◽  
Haplotype Blocks ◽  
Genome Wide ◽  
Hanwoo Cattle

Hanwoo, is the most popular native beef cattle in South Korea. Due to its extensive popularity, research is ongoing to enhance its carcass quality and marbling traits. In this study we conducted a haplotype-based genome-wide association study (GWAS) by constructing haplotype blocks by three methods: number of single nucleotide polymorphisms (SNPs) in a haplotype block (nsnp), length of genomic region in kb (Len) and linkage disequilibrium (LD). Significant haplotype blocks and genes associated with them were identified for carcass traits such as BFT (back fat thickness), EMA (eye Muscle area), CWT (carcass weight) and MS (marbling score). Gene-set enrichment analysis and functional annotation of genes in the significantly-associated loci revealed candidate genes, including PLCB1 and PLCB4 present on BTA13, coding for phospholipases, which might be important candidates for increasing fat deposition due to their role in lipid metabolism and adipogenesis. CEL (carboxyl ester lipase), a bile-salt activated lipase, responsible for lipid catabolic process was also identified within the significantly-associated haplotype block on BTA11. The results were validated in a different Hanwoo population. The genes and pathways identified in this study may serve as good candidates for improving carcass traits in Hanwoo cattle.

scholarly journals Extent of genome-wide linkage disequilibrium in Australian Holstein-Friesian cattle based on a high-density SNP panel

BMC Genomics ◽  
2008 ◽  
Vol 9 (1) ◽  
pp. 187 ◽  
Author(s):  
Mehar S Khatkar ◽  
Frank W Nicholas ◽  
Andrew R Collins ◽  
Kyall R Zenger ◽  
Julie AL Cavanagh ◽  
...  
Keyword(s):  
Linkage Disequilibrium ◽  
High Density ◽  
Genome Wide ◽  
Holstein Friesian ◽  
Snp Panel ◽  
Friesian Cattle ◽  
Genome Wide Linkage Disequilibrium

scholarly journals Causal Haplotype Block Identification in Plant Genome-Wide Association Studies

2021 ◽  
Author(s):  
Xing Wu ◽  
Wei Jiang ◽  
Christopher Fragoso ◽  
Jing Huang ◽  
Geyu Zhou ◽  
...  
Keyword(s):  
Fine Mapping ◽  
Complex Traits ◽  
Haplotype Block ◽  
Association Studies ◽  
Crop Improvement ◽  
Plant Genome ◽  
Genome Wide Association ◽  
Genome Wide Association Studies ◽  
Haplotype Blocks ◽  
Genome Wide

Genome wide association studies (GWAS) can play an essential role in understanding genetic basis of complex traits in plants and animals. Conventional SNP-based linear mixed models (LMM) used in many GWAS that marginally test single nucleotide polymorphisms (SNPs) have successfully identified many loci with major and minor effects. In plants, the relatively small population size in GWAS and the high genetic diversity found many plant species can impede mapping efforts on complex traits. Here we present a novel haplotype-based trait fine-mapping framework, HapFM, to supplement current GWAS methods. HapFM uses genotype data to partition the genome into haplotype blocks, identifies haplotype clusters within each block, and then performs genome-wide haplotype fine-mapping to infer the causal haplotype blocks of trait. We benchmarked HapFM, GEMMA, BSLMM, and GMMAT in both simulation and real plant GWAS datasets. HapFM consistently resulted in higher mapping power than the other GWAS methods in simulations with high polygenicity. Moreover, it resulted in higher mapping resolution, especially in regions of high LD, by identifying small causal blocks in the larger haplotype block. In the Arabidopsis flowering time (FT10) datasets, HapFM identified four novel loci compared to GEMMA results, and its average mapping interval of HapFM was 9.6 times smaller than that of GEMMA. In conclusion, HapFM is tailored for plant GWAS to result in high mapping power on complex traits and improved mapping resolution to facilitate crop improvement.

scholarly journals Evaluation of Linkage Disequilibrium, Effective Population Size and Haplotype Block Structure in Chinese Cattle

Animals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 83 ◽  
Author(s):  
Lei Xu ◽  
Bo Zhu ◽  
Zezhao Wang ◽  
Ling Xu ◽  
Ying Liu ◽  
...  
Keyword(s):  
Linkage Disequilibrium ◽  
Genomic Selection ◽  
Haplotype Block ◽  
Block Structure ◽  
Effective Population ◽  
Chinese Cattle ◽  
Genome Wide ◽  
Population Sizes ◽  
Haplotype Block Structure ◽  
Selection For

Understanding the linkage disequilibrium (LD) across the genome, haplotype structure, and persistence of phase between breeds can enable us to appropriately design and implement the genome-wide association (GWAS) and genomic selection (GS) in beef cattle. We estimated the extent of genome-wide LD, haplotype block structure, and the persistence of phase in 10 Chinese cattle population using high density BovinHD BeadChip. The overall LD measured by r2 between adjacent SNPs were 0.60, 0.67, 0.58, 0.73, and 0.71 for South Chinese cattle (SCHC), North Chinese cattle (NCC), Southwest Chinese cattle (SWC), Simmental (SIM), and Wagyu (WAG). The highest correlation (0.53) for persistence of phase across groups was observed for SCHC vs. SWC at distances of 0–50 kb, while the lowest correlation was 0.13 for SIM vs. SCHC at the same distances. In addition, the estimated current effective population sizes were 27, 14, 31, 34, and 43 for SCHC, NCC, SWC, SIM, and WAG, respectively. Our result showed that 58K, 87K, 95K, 52K, and 52K markers were required for implementation of GWAS and GS in SCHC, NCC, SWC, SIM, and WAG, respectively. Also, our findings suggested that the implication of genomic selection for multipopulation with high persistence of phase is feasible for Chinese cattle.

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