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Chondrodystrophy: an inherited lethal condition in turkey embryos.

L J Gaffney

    The Journal of Heredity
    |November 1, 1975
    PubMed
    Summary
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    Chondrodystrophy in turkeys is an embryonic lethal condition inherited as a single autosomal recessive trait. This finding aids in understanding genetic disorders in avian species.

    Area of Science:

    • Avian genetics
    • Developmental biology
    • Teratology

    Background:

    • Chondrodystrophy is a developmental disorder affecting bone growth.
    • Embryonic lethality due to chondrodystrophy has been observed in various avian species.
    • Understanding the genetic basis of chondrodystrophy is crucial for avian breeding programs.

    Purpose of the Study:

    • To investigate the inheritance pattern of chondrodystrophy in a special line of turkeys.
    • To determine the mode of inheritance and identify the genetic locus responsible for this embryonic lethal condition.
    • To compare the expression of chondrodystrophy in parthenogenetically produced embryos versus those from bisexual matings.

    Main Methods:

    • Parthenogenetic production of embryos from virgin dams.

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  • Bisexual matings using the same dams.
  • Phenotypic assessment of embryos at different developmental stages (micromelia, brachycephaly).
  • Analysis of inheritance patterns in both parthenogenetic and bisexual progeny.
  • Genetic background alteration to assess its effect on the condition.

    • Main Results:

    • Chondrodystrophy presented as an embryonic lethal, with micromelia and brachycephaly observed after 9 days of incubation.
    • Lethality primarily occurred after 16 days of incubation.
    • Modified phenotypes were observed in a few affected embryos but not in parthenogenetic production, suggesting heterozygosity.
    • Altering the genetic background did not affect the condition's expression.
    • The condition was consistently inherited as a single, autosomal, recessive lethal trait (ch).

    Conclusions:

    • Chondrodystrophy in this turkey line is a single autosomal recessive lethal condition.
    • Parthenogenetic studies support the recessive lethal nature and suggest heterozygosity for modified phenotypes.
    • The mutant allele 'ch' is identified as responsible for chondrodystrophy in turkeys.
    • Findings contribute to the understanding of avian genetic disorders and embryonic lethality.