Abstract
We introduce this communication with a brief outline of the historical landmarks in genetic modeling, especially concerning epistasis. Then, we present methods for the use of genetic modeling in QTL analyses. In particular, we summarize the essential expressions of the natural and orthogonal interactions (NOIA) model of genetic effects. Our motivation for reviewing that theory here is twofold. First, this review presents a digest of the expressions for the application of the NOIA model, which are often mixed with intermediate and additional formulae in the original articles. Second, we make the required theory handy for the reader to relate the genetic concepts to the particular mathematical expressions underlying them. We illustrate those relations by providing graphical interpretations and a diagram summarizing the key features for applying genetic modeling with epistasis in comprehensive QTL analyses. Finally, we briefly review some examples of the application of NOIA to real data and the way it improves the interpretability of the results.
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Fisher RA (1918) The correlation between relatives on the supposition of Mendelian inheritance. Trans Roy Soc Edinburgh 52:339–433
Edwards AW (2000) The genetical theory of natural selection. Genetics 154:1419–1426
Kempthorne O (1997) Heritability: uses and abuses. Genetica 99:109–112
Fisher RA (1930) The genetical theory of natural selection. Clarendon, Oxford
Wright S (1931) Evolution in Mendelian populations. Genetics 16:93–159
Dobzhansky T (1936) Studies on hybrid sterility. II. Location of sterility factors in Drosophila pseudoobscura hybrids. Genetics 21:113–135
Muller HJ (1942) Isolating mechanisms, evolution, and temperature. Biol Symp 6:71–125
Waddington CH (1953) Genetic assimilation of an acquired character. Evolution 7:118–126
Kempthorne O (1954) The correlation between relatives in a random mating population. Proc R Soc Lond B Biol Sci 143:102–113
Kempthorne O (1957) An introduction to genetic statistics. Wiley, New York
Cockerham CC (1954) An extension of the concept of partitioning hereditary variance for analysis of covariances among relatives when epistasis is present. Genetics 39:859–882
Cheverud JM, Routman EJ (1995) Epistasis and its contribution to genetic variance components. Genetics 139:1455–1461
Cheverud JM (2000) Detecting epistasis among quantitative trait loci. In: Wolf JB, Brodie ED, Wade MJ (eds) Epistasis and the evolutionary process. Oxford University Press, Oxford
Mather K, Jinks JL (1982) Introduction to biometrical genetics. Chapman and Hall, London
Hansen TF, Wagner GP (2001) Modeling genetic architecture: a multilinear theory of gene interaction. Theor Popul Biol 59:61–86
Phillips PC (2008) Epistasis—the essential role of gene interactions in the structure and evolution of genetic systems. Nat Rev Genet 9:855–867
Álvarez-Castro JM, Carlborg Ö (2007) A unified model for functional and statistical epistasis and its application in quantitative trait loci analysis. Genetics 176:1151–1167
Yang R-C, Álvarez-Castro JM (2008) Functional and statistical genetic effects with multiple alleles. Curr Topics Genet 3:49–62
Tiwari HK, Elston RC (1997) Deriving components of genetic variance for multilocus models. Genet Epidemiol 14:1131–1136
Yang R-C (2004) Epistasis of quantitative trait loci under different gene action models. Genetics 167:1493–1505
Noguera JL, Rodriguez C, Varona L et al (2009) A bi-dimensional genome scan for prolificacy traits in pigs shows the existence of multiple epistatic QTL. BMC Genomics 10:636–648
Rönnegård L, Besnier F, Carlborg Ö (2008) An improved method for quantitative trait loci detection of within-line segregation in F2 intercross designs. Genetics 178:2315–2326
Wei W-H, Knott SA, Haley CS, de Koning D-J (2010) Controlling false positives in the mapping of epistatic QTL. Heredity 104(4):401–409
Carlborg Ö, Haley CS (2004) Epistasis: too often neglected in complex trait studies? Nat Rev Genet 5:618–625
Malmberg RL, Mauricio R (2005) QTL-based evidence for the role of epistasis in evolution. Genet Res 86:89–95
Álvarez-Castro JM, Yang RC (2011) Multiallelic models of genetic effects and variance decomposition in non-equilibrium populations. Genetica 139:1119–1134
Van der Ween JH (1959) Tests of non-allelic interaction and linkage for quantitative characters in generations derived from two diploid pure lines. Genetica 30:201–232
Kao CH, Zeng ZB (2002) Modeling epistasis of quantitative trait loci using Cockerham’s model. Genetics 160:1243–1261
Nettelblad C, Carlborg Ö, Álvarez-Castro JM (2010) On orthogonal QTL parameter estimates with incomplete genotype information. In: Science GSfA (ed) 10th WCGALP, Leipzig, Germany
Fisher RA (1941) Average excess and average effect of a gene substitution. Ann Eugen 11:53–63
Bürger R (2000) The mathematical theory of selection, recombination and mutation. Wiley, Chichester
Haley CS, Knott SA (1992) A simple regression method for mapping quantitative trait loci in line crosses using flanking markers. Heredity 69:315–324
Martínez O, Curnow RN (1992) Estimating the locations and the sizes of the effects of quantitative trait loci using flanking markers. Theor Appl Genet 85:480–488
Álvarez-Castro JM, Le Rouzic A, Carlborg Ö (2008) How to perform meaningful estimates of genetic effects. PLoS Genet 4:e1000062
Le Rouzic A, Álvarez-Castro JM, Carlborg Ö (2008) Dissection of the genetic architecture of body weight in chicken reveals the impact of epistasis on domestication traits. Genetics 179:1591–1599
Besnier F, Le Rouzic A, Álvarez-Castro JM (2010) Applying QTL analysis to conservation genetics. Conserv Genet 11:399–408
Acknowledgments
Rong-Cai Yang has contributed to the development of the models of genetic effects that we have reviewed within this book chapter. Carl Nettelblad has extensively worked on the IMI, on which we have also commented. JÁC acknowledges funding by an “Isidro Parga Pondal” contract from the autonomous administration Xunta de Galicia and from project BFU2009-11988 from the Spanish Ministry of Science. ÖC is funded by a EURYI Award from ESF and a Future Research Leader Grant from the Swedish Foundation for Strategic Research. LR recognizes financial support by the Swedish Research Council FORMAS.
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Álvarez-Castro, J.M., Carlborg, Ö., Rönnegård, L. (2012). Estimation and Interpretation of Genetic Effects with Epistasis Using the NOIA Model. In: Rifkin, S. (eds) Quantitative Trait Loci (QTL). Methods in Molecular Biology, vol 871. Humana Press. https://doi.org/10.1007/978-1-61779-785-9_10
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DOI: https://doi.org/10.1007/978-1-61779-785-9_10
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