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Genetics, Vol 147, 765-776, Copyright © 1997
INVESTIGATIONS |
Developmental Quantitative Genetics, Conditional Epigenetic Variability and Growth in Mice
W. R. Atchley and J. Zhu
Center for Quantitative Genetics, Department of Genetics, North Carolina State University, Raleigh, North Carolina 27695-7614
Ontogenetic variation in the causal components of phenotypic variability and covariability is described for body weight and tail length in mice derived from a full 7 X 7 diallel cross. Age-related changes in additive, dominance, sex-linked and maternal variance and covariance between 14 and 70 days of age are described. Age-specific variance components at time t are conditioned on the causal genetic effects at time (t - 1). This procedure demonstrates the generation of significant episodes of new genetic variation arising at specific intervals during ontogeny. These episodes of new genetic variation are placed in the context of epigenetic models in developmental quantitative genetics. These results are also concordant on recent findings on age-specific gene expression in mouse growth as shown by QTL analyses.
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