Difference between revisions of "Genomic data in lmt"
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lmt can account for genomic data via genomic relationship matrices $$G$$ and single step relationship matrices $$H$$ where ssGBLUP<ref name="Christensen2010/>, ssGTBLUP<ref name="Mäntysaari2017"/>, and ssSNPBLUP<ref name="Liu2014"/> are supported. lmt accepts plain marker data and will calculate all necessary derivatives required by the model. Genotypes can be scaled using average or marker specific allele content variance (2pq), and allele frequencies are either calculated from the data, or read from user specified input files. Futher, if requested $$G$$ can be adjusted to fit $$A$$<ref name="Christensen2012"/>, even for models where $$G$$ is not build(e.g. ssSNP-BLUP). | lmt can account for genomic data via genomic relationship matrices $$G$$ and single step relationship matrices $$H$$ where ssGBLUP<ref name="Christensen2010/>, ssGTBLUP<ref name="Mäntysaari2017"/>, and ssSNPBLUP<ref name="Liu2014"/> are supported. lmt accepts plain marker data and will calculate all necessary derivatives required by the model. Genotypes can be scaled using average or marker specific allele content variance (2pq), and allele frequencies are either calculated from the data, or read from user specified input files. Futher, if requested $$G$$ can be adjusted to fit $$A$$<ref name="Christensen2012"/>, even for models where $$G$$ is not build(e.g. ssSNP-BLUP). | ||
==Genetic Groups== | ==Genetic Groups and Meta-founders== | ||
If the pedigree constituting $$A$$ contains phantom parents, genetic groups are automatically fitted for all different Single-Step co-variance structures. Alternatively, genetic groups can be fitted as an extra factor. | If the pedigree constituting $$A$$ contains phantom parents, genetic groups are automatically fitted for all different Single-Step co-variance structures. Alternatively, genetic groups can be fitted as an extra factor. | ||
Meta-founders are fitted automatically if a meta-founder co-variance matrix has been supplied. | |||
==Single-Step SNP-BLUP== | ==Single-Step SNP-BLUP== | ||
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<ref name="Westell1988">Westell et al.; Genetic Groups in an Animal Model; Journal of Dairy Science; 1988</ref> | <ref name="Westell1988">Westell et al.; Genetic Groups in an Animal Model; Journal of Dairy Science; 1988</ref> | ||
<ref name="Christensen2010">Christensen et al.; Genomic prediction when some animals are not genotyped; Genetics Selection Evolution; 2010</ref> | <ref name="Christensen2010">Christensen et al.; Genomic prediction when some animals are not genotyped; Genetics Selection Evolution; 2010</ref> | ||
<ref name="Christensen2012">O.F. Christensen; Compatibility of pedigree-based and marker-based relationship matrices for single-step genetic evaluation; Genetics Selection Evolution; 2012</ref> | |||
<ref name="Liu2014">Liu et al.;A single-step genomic model with direct estimation of marker effects; Journal of Dairy Science;2014</ref> | <ref name="Liu2014">Liu et al.;A single-step genomic model with direct estimation of marker effects; Journal of Dairy Science;2014</ref> | ||
<ref name="Mäntysaari2017">Mäntysaari et al.;Efficient single-step genomic evaluation for a multibreed beef cattle population having many genotyped animals; Journal of Animal Science;2017</ref> | <ref name="Mäntysaari2017">Mäntysaari et al.;Efficient single-step genomic evaluation for a multibreed beef cattle population having many genotyped animals; Journal of Animal Science;2017</ref> | ||
</references> | </references> | ||
Revision as of 00:55, 12 May 2022
lmt can account for genomic data via genomic relationship matrices $$G$$ and single step relationship matrices $$H$$ where ssGBLUP[1], ssGTBLUP[2], and ssSNPBLUP[3] are supported. lmt accepts plain marker data and will calculate all necessary derivatives required by the model. Genotypes can be scaled using average or marker specific allele content variance (2pq), and allele frequencies are either calculated from the data, or read from user specified input files. Futher, if requested $$G$$ can be adjusted to fit $$A$$[4], even for models where $$G$$ is not build(e.g. ssSNP-BLUP).
Genetic Groups and Meta-founders
If the pedigree constituting $$A$$ contains phantom parents, genetic groups are automatically fitted for all different Single-Step co-variance structures. Alternatively, genetic groups can be fitted as an extra factor.
Meta-founders are fitted automatically if a meta-founder co-variance matrix has been supplied.
Single-Step SNP-BLUP
lmt's Single-Step SNP-BLUP model uses the approach described in Liu and Goddard 2014Cite error: Closing </ref> missing for <ref> tag
[5]
[1]
[4]
[3]
[2]
</references>
- ↑ 1.0 1.1 Christensen et al.; Genomic prediction when some animals are not genotyped; Genetics Selection Evolution; 2010
- ↑ 2.0 2.1 Mäntysaari et al.;Efficient single-step genomic evaluation for a multibreed beef cattle population having many genotyped animals; Journal of Animal Science;2017
- ↑ 3.0 3.1 Liu et al.;A single-step genomic model with direct estimation of marker effects; Journal of Dairy Science;2014
- ↑ 4.0 4.1 O.F. Christensen; Compatibility of pedigree-based and marker-based relationship matrices for single-step genetic evaluation; Genetics Selection Evolution; 2012
- ↑ Westell et al.; Genetic Groups in an Animal Model; Journal of Dairy Science; 1988