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Complex quantitative traits cracked by the mouse inter-subspecific consomic strains.
Toyoyuki Takada1, Toshihiko Shiroishi
1Mammalian Genetics Laboratory, National Institute of Genetics, 1111 Yata, Mishima, Shizuoka 411-8540, Japan.
Experimental Animals
|August 2, 2012
Summary
Researchers developed novel mouse models to untangle complex genetic influences on traits like body weight. These consomic strains help identify both simple and complex genetic interactions affecting quantitative traits.
Area of Science:
- Genetics and Genomics
- Mammalian Trait Analysis
- Quantitative Trait Loci (QTL) Discovery
Background:
- Mammalian quantitative traits (e.g., body weight, biochemical parameters) result from complex interactions of genetic, epigenetic, and environmental factors.
- Analyzing these complex traits is challenging due to multifactorial inheritance.
- Classical inbred mouse strains like C57BL/6J and MSM/Ms possess significant genomic divergence, originating from different subspecies.
Purpose of the Study:
- To overcome the complexity in analyzing mammalian quantitative traits.
- To establish and utilize a comprehensive set of consomic mouse strains (chromosome substitution strains).
- To identify genetic determinants, including both additive and nonadditive effects, underlying quantitative traits.
Main Methods:
- Creation of a full set of consomic mouse strains by substituting each chromosome of C57BL/6J with its MSM/Ms counterpart.
- Comprehensive phenotype screening across these inter-subspecific consomic strains.
- Analysis of phenotypic data to identify genetic contributions to quantitative traits.
Main Results:
- The consomic strains enabled the identification of genetic determinants for numerous quantitative traits.
- Some traits showed simple additive genetic effects, reflecting differences between C57BL/6J and MSM/Ms.
- Other traits exhibited values exceeding parental ranges, indicating nonadditive genetic interactions among substituted and host chromosomes.
Conclusions:
- Inter-subspecific consomic mouse strains are powerful tools for dissecting the genetic architecture of complex quantitative traits.
- These strains can differentiate between additive and nonadditive genetic effects.
- The study highlights the utility of consomic strains for understanding the genetic basis of mammalian phenotypes.
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