Journal
BMC GENETICS
Volume 9, Issue -, Pages -Publisher
BMC
DOI: 10.1186/1471-2156-9-4
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Funding
- NCRR NIH HHS [S10 RR026752, S10 RR025607] Funding Source: Medline
- NIAAA NIH HHS [AA-12715, R01 AA012715] Funding Source: Medline
- NIDDK NIH HHS [DK-46791, R01 DK058797-04, R01 DK058797-08S1, R01 DK058797-03, R01 DK058797-05, R01 DK046791, R01 DK058797-08, R01 DK058797-01, R01 DK058797-06, R01 DK046791-13, DK-58797, R01 DK094759, R01 DK058797-02, R01 DK058797-07, R01 DK058797] Funding Source: Medline
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Background: During a search for obesity candidate genes in a small region of the mouse genome, we noticed that many genes when knocked out influence body weight. To determine whether this was a general feature of gene knockout or a chance occurrence, we surveyed the Jackson Laboratory Mouse Genome Database for knockout mouse strains and their phenotypes. Body weights were not available for all strains so we also obtained body weight information by contacting a random sample of investigators responsible for a knockout strain. Results: We classified each knockout mouse strain as (1) lighter and smaller, (2) larger and heavier, or (3) the same weight, relative to control mice. We excluded knockout strains that died early in life, even though this type of lethality is often associated with a small embryo or reduced body size. Based on a dataset of 1,977 knockout strains, we found that that 31% of viable knockout mouse strains weighed less and an additional 3% weighed more than did controls. Conclusion: Body weight is potentially a latent variable in about a third of experiments that use knockout mice and should be considered in interpreting experimental outcomes, e. g., in studies of hypertension, drug and hormone metabolism, organ development, cell proliferation and apoptosis, digestion, heart rate, or atherosclerosis. If we assume that the knockout genes we surveyed are representative then upward of 6,000 genes are predicted to influence the size of a mouse. Body weight is highly heritable, and numerous quantitative trait loci have been mapped in mice, but multigenic is an insufficient term for the thousands of loci that could contribute to this complex trait.
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