Key Points
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The mouse is the leading mammalian model organism for basic genetic research and to study human diseases. The current mouse mutant resources already contain mutations for essentially all genes and markers, but many of these mutations still need to be established in mouse lines as a free resource for the scientific community.
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To maximize the potential of the mouse as a model organism, we now face challenges that go beyond simply establishing a mutant line for every gene. The focus of genetic research for the next generation of mouse models can be considered at three main levels: the genotype, the phenotype and what we term the envirotype.
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At the genotype level, mutations are required that are more closely related to human mutations and genetic variants.
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At the phenotype level, systematic (each mutant mouse line) and systemic (examining all organ systems) analysis of mutant mouse lines is required.
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Several mouse clinics have provided essential phenotype data that is fundamental for the analysis of primary and secondary effects of mutations. The capacities of these mouse clinics will need to be increased to make significant progress at a faster pace.
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The analysis of envirotypes (which are sets of exogenous factors that affect the phenotype) will be essential for accurately modelling human diseases in the mouse, but this research is just beginning.
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A map of exogenous factors and their effects on the mammalian genome will be required. The extent to which the effects of particular envirotypes are the same in mice and humans remains to be determined.
Abstract
The mouse is the leading mammalian model organism for basic genetic research and for studying human diseases. Coordinated international projects are currently in progress to generate a comprehensive map of mouse gene functions — the first for any mammalian genome. There are still many challenges ahead to maximize the value of the mouse as a model, particularly for human disease. These involve generating mice that are better models of human diseases at the genotypic level, systemic (assessing all organ systems) and systematic (analysing all mouse lines) phenotyping of existing and new mouse mutant resources, and assessing the effects of the environment on phenotypes.
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Acknowledgements
The authors are funded through the German Ministry of Science and Education and the European Commission (grant numbers: 01GS0850, LSHG-2006-037188, 211414, LSHG-CT-2006-518240, MRTN-CT-2006-035468).
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Australian Phenomics Facility (APF)
Charles River's phenotyping screens, Massachusetts
Comparative Pathology Laboratory (CPL)
Institut Clinique de la Souris (ICS)
Jackson Laboratory Phenotyping Services
Laboratory Animal Sciences Program (LASP)
Mammalian Genetics Phenotyping
Mouse Genetics Programme — Phenotyping
Mouse Phenotyping Shared Resource (MPSR)
Research Animal Diagnostic Laboratory (RADIL)
Toronto Centre for Phenogenomics (TCP)
Glossary
- Genotype
-
A description of the endogenous genetic information carried by an organism, as distinguished from its physical appearance (its phenotype) and external environmental factors (its envirotype).>
- Phenotype
-
A description of any observable (macroscopic, microscopic or molecular) trait of an individual with respect to some inherited characteristic.
- Envirotype
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A description of factors that are exogenous to the organism. The environmental code and the genetic code together affect the phenotype.
- Pleiotropic
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A situation in which a single gene has an effect on two or more distinct phenotypic characters.
- Transposon
-
A type of mobile genetic element that consists of DNA that can move to new genomic locations conservatively (without replicating itself) or replicatively (by moving a copy of itself).
- QTL
-
Genetic locus or chromosomal region that contributes to the variability in complex quantitative traits (such as body weight), as identified by statistical analysis. Quantitative traits are typically affected by several genes and by the environment.
- Genotype-driven mutagenesis
-
A reverse genetic approach that starts with the targeted mutagenesis of a known gene or marker sequence. The gene targeting is followed by the analysis of the mutant phenotype. This approach is generally based on a hypothesis about a potential function of the mutated gene.
- Phenotype-driven mutagenesis
-
A forward genetic approach that starts with the identification of a mutant phenotype caused by a random mutation in the genome. The identification of the mutated gene or marker is subsequent to the identification of the mutant mouse line. This approach makes no assumption of which genes may underlie a disease.
- SNP
-
A type of polymorphism in which genomic segments differ by a single base pair.
- Copy number variant
-
A type of polymorphism in which a segment of genomic DNA is present at a different copy number with respect to a reference genome.
- N-ethyl-N-nitrosourea
-
A chemical mutagen that introduces point mutations in spermatogonia of male mice with high efficiency. It can be used as a mutagen in gene-driven and phenotype-driven mutagenesis.
- Zinc-finger nuclease
-
Synthetic protein composed of a nonspecific DNA-cleaving domain and a highly specific DNA-binding domain, which comprises a string of zinc-finger motifs. Zinc-finger nucleases and subsequent DNA repair by homologous recombination can be used to mutagenize genes.
- Off-target effect
-
These effects may compromise the specificity of RNAi and can occur if there is sequence identity between the small interfering RNA and random mRNA transcripts, causing knockdown of the expression of non-targeted genes.
- Redundancy
-
When two genes can fulfil an equivalent function. Because gene functions are frequently pleiotropic, redundancy is often partial, with two genes having overlapping rather than equivalent functions.
- Epistasis
-
The interaction between different genes that affect the same trait. Epistasis takes place when the phenotype of one genetic allele (mutant or natural variant) is modified by one or several other genes (also called modifier genes), such that the joint phenotype differs from the one that would be produced if the two genes were acting independently.
- Sensitized mutagenesis screen
-
A phenotype-driven mutagenesis screen in which mice carrying a targeted mutation are bred with N-ethyl-N-nitrosourea-treated males in order to provide a sensitized system for detecting dominant modifier mutations.
- Consomic
-
Describes a mouse strain that is produced by a breeding strategy in which recombinants between two inbred strains are backcrossed to produce a strain that carries a single chromosome from one strain on the genetic background of the other.
- Congenic
-
Describes a mouse strain that is produced by a breeding strategy in which recombinants between two inbred strains are backcrossed to produce a strain that carries a single genomic segment from one strain on the genetic background of the other.
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Beckers, J., Wurst, W. & de Angelis, M. Towards better mouse models: enhanced genotypes, systemic phenotyping and envirotype modelling. Nat Rev Genet 10, 371–380 (2009). https://doi.org/10.1038/nrg2578
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DOI: https://doi.org/10.1038/nrg2578
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