Abstract
The processes by which genetic variation in complex traits is generated and maintained in populations has for a long time been treated in abstract and statistical terms. As a consequence, quantitative genetics has provided limited insights into our understanding of the molecular bases of quantitative trait variation. With the developing technological and conceptual tools of systems biology, cellular and molecular processes are being described in greater detail. While we have a good description of how signaling and other molecular networks are organized in the cell, we still do not know how genetic variation affects these pathways, because systems and molecular biology usually ignore the type and extent of genetic variation found in natural populations. Here we discuss the quantitative genetics and systems biology approaches for the study of complex trait architecture and discuss why these two disciplines would synergize with each other to answer questions that neither of the two could answer alone.
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Notes
- 1.
A single genotype can sometimes give rise to multiple phenotypic values depending on environmental conditions or random factors such as developmental and gene expression noise.
- 2.
It is increasingly clear that copy number differences are pervasive within populations. How duplications or deletions are handled within quantitative genetics depends upon how the genotype space is set up and conceptualized. Traditionally the edges of a genotype space (see Fig. 17.3) represent mutations between different alleles at a locus where each locus is a single copy. However, these genotype spaces could be used to represent movement between copy number variants. The “allele swapping” represented by an edge would not be point mutation or small indels but would instead be duplications or deletions. In this case the “allele” would be the copy number of the gene.
- 3.
Usually, the genetic component of a phenotype for a genotype that is predicted by a quantitative genetic model is called the genotypic value. In these examples we do not have any environmental effect and so the phenotypic landscape is also the landscape of genotypic values. For consistency with the systems biology section, we will talk in terms of phenotypes instead of genotypic values.
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Acknowledgements
We thank two anonymous reviewers for their comments. CRL’s and SAR’s research on evolutionary systems biology is funded by the Human Frontier Science Program (RGY0073/2010)
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Landry, C.R., Rifkin, S.A. (2012). The Genotype–Phenotype Maps of Systems Biology and Quantitative Genetics: Distinct and Complementary. In: Soyer, O. (eds) Evolutionary Systems Biology. Advances in Experimental Medicine and Biology, vol 751. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3567-9_17
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