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Responses to divergent selection for plasma concentrations of insulin-like growth factor-1 in mice

Published online by Cambridge University Press:  14 April 2009

H. T. Blair ,
S. N. McCutcheon ,
D. D. S. Mackenzie ,
P. D. Gluckman ,
J. E. Ormsby  and
B. H. Brier
S. N. McCutcheon
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
D. D. S. Mackenzie
Affiliation:
Department of Animal Science, Massey University, Palmerston North, New Zealand
P. D. Gluckman
Affiliation:
Department of Paediatrics, University of Auckland Medical School, Auckland, New Zealand
J. E. Ormsby
Affiliation:
Small Animal Production Unit, Massey University, Palmerston North, New Zealand
B. H. Brier
Affiliation:
Department of Paediatrics, University of Auckland Medical School, Auckland, New Zealand
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Summary

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A divergent selection experiment with mice, using plasma concentrations of insulin-like growth factor-1 (IGF-1) at 42 days of age as the selection criterion, was undertaken for 7 generations. Lines were not replicated. To obtain sufficient plasma for the IGF-1 assay, blood from four individuals was volumetrically bulked to obtain a litter mean IGF-1 concentration. This necessitated the use of between family selection. Although inbreeding accumulated in a linear fashion in each of the high, control and low lines, the rates were different for each line (3·6, 1·6 and 5·3% per generation for the high, control and low lines, respectively). As a consequence, the effects of selection and inbreeding are confounded in this experiment. Divergence between the high and low lines in plasma concentrations of IGF-1 continued steadily until generation 5. In generations 6 and 7, there was a reduced degree of divergence and this contributed towards the low realized heritability value of 0.15 ± 0.12. Six-week liveweight showed a steady positive correlated response to selection for or against plasma concentrations of IGF-1 until generation 4 (high-low difference = 1·7 g = 12%). In generation 5, a substantial drop in 6-week liveweight in the low line relative to both the high and control lines occurred (high-low difference, 3·9; g, 25%). This difference was maintained until generation 7.

This experiment suggests that genetic variation exists at 6 weeks of age in plasma concentrations of IGF-1 in mice. Furthermore, genetic covariation between plasma IGF-1 concentrations and liveweight at 6 weeks of age is likely to be positive. Further experiments have been initiated to examine these theories.

Type
Research Article
Information
Genetics Research , Volume 53 , Issue 3 , June 1989 , pp. 187 - 192
Copyright
Copyright © Cambridge University Press 1989

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