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The Journal of Heredity 1998:89(3)
© 1998 The American Genetic Association 89:222-226

Evidence for a genetic variation in mitochondrial genome affecting traits in white leghorn chickens

S Li1, SE Aggrey1, D Zadworny1, W Fairfull2, and U Kuhnlein1,*

1Department of Animal Science, McGill University, Ste. Anne de Bellevue, Quebec, Canada H9X 3V9 2Centre for Food and Animal Research, Agriculture Canada, Ottawa, Ontario, Canada *Corresponding author e-mail: kuhnleinu@agradm.ian.mcgill.ca.

A mitochondrial Mspl RFLP which was coselected with Marek's disease (MD) resistance in White Leghorn chickens was mapped to the NADH subunit IV. The RFLP was due to a transition, resulting in the change of the low-usage threonine triplet ACT (Mspl- allele) to the high usage triplet ACC (Mspl+ allele). Trait association studies within an unselected strain revealed that the Mspl- allele whose frequency was reduced in Md resistant strains was associated with high body weight and high egg specific gravity (a measure of eggshell thickness). Analysis at three different time points indicated a significant interaction between the mitochondrial genotype and the growth hormone genotype in early but not in late adulthood. The analysis indicates that mitochondrial variants may contribute to phenotypic variation in chickens and that such contributions may be dependent on the genetic background.


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[Abstract] [Full Text] [PDF]


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