Comparison of weighting approaches for genetic risk scores in gene-environment interaction studiesBMC Genetics - Tập 18 - Trang 1-12 - 2017
Anke Hüls, Ursula Krämer, Christopher Carlsten, Tamara Schikowski, Katja Ickstadt, Holger Schwender
Weighted genetic risk scores (GRS), defined as weighted sums of risk alleles of single nucleotide polymorphisms (SNPs), are statistically powerful for detection gene-environment (GxE) interactions. To assign weights, the gold standard is to use external weights from an independent study. However, appropriate external weights are not always available. In such situations and in the presence of predo...... hiện toàn bộ
Power and sample size calculations in the presence of phenotype errors for case/control genetic association studiesBMC Genetics - Tập 6 - Trang 1-12 - 2005
Brian J Edwards, Chad Haynes, Mark A Levenstien, Stephen J Finch, Derek Gordon
Phenotype error causes reduction in power to detect genetic association. We present a quantification of phenotype error, also known as diagnostic error, on power and sample size calculations for case-control genetic association studies between a marker locus and a disease phenotype. We consider the classic Pearson chi-square test for independence as our test of genetic association. To determine as...... hiện toàn bộ
Recombination of the porcine X chromosome: a high density linkage mapBMC Genetics - Tập 15 - Trang 1-6 - 2014
Ana I Fernández, María Muñoz, Estefânia Alves, Josep María Folch, Jose Luis Noguera, Miguel Pérez Enciso, Maria del Carmen Rodríguez, Luis Silió
Linkage maps are essential tools for the study of several topics in genome biology. High density linkage maps for the porcine autosomes have been constructed exploiting the high density data provided by the PorcineSNP60 BeadChip. However, a high density SSCX linkage map has not been reported up to date. The aim of the current study was to build an accurate linkage map of SSCX to provide precise es...... hiện toàn bộ
Comparison of missing data approaches in linkage analysisBMC Genetics - Tập 4 - Trang 1-4 - 2003
Chao Xing, Fredrick R Schumacher, David V Conti, John S Witte
Observational cohort studies have been little used in linkage analyses due to their general lack of large, disease-specific pedigrees. Nevertheless, the longitudinal nature of such studies makes them potentially valuable for assessing the linkage between genotypes and temporal trends in phenotypes. The repeated phenotype measures in cohort studies (i.e., across time), however, can have extensive m...... hiện toàn bộ
Estimation of genetic parameters and detection of quantitative trait loci for minerals in Danish Holstein and Danish Jersey milkBMC Genetics - Tập 16 - Trang 1-8 - 2015
Bart Buitenhuis, Nina A Poulsen, Lotte B Larsen, Jakob Sehested
Bovine milk provides important minerals, essential for human nutrition and dairy product quality. For changing the mineral composition of the milk to improve dietary needs in human nutrition and technological properties of milk, a thorough understanding of the genetics underlying milk mineral contents is important. Therefore the aim of this study was to 1) estimate the genetic parameters for indiv...... hiện toàn bộ