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Ectopic testes in the Norway rat.

L G Gumbreck, A J Stanley, J E Allison

    The Journal of Experimental Zoology
    |April 1, 1984
    PubMed
    Summary
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    A heritable defect causing ectopic testes in male rats, termed the ect gene, is autosomal recessive. Genetic resistance influences the expression of this trait, suggesting multifactorial inheritance.

    Area of Science:

    • Genetics
    • Developmental Biology
    • Animal Models

    Background:

    • Ectopic testes, a condition where testes are not in their normal scrotal position, have been observed in a King-Holtzman rat colony.
    • This defect appears to be heritable, with affected males exhibiting unilateral or bilateral testicular malposition.

    Purpose of the Study:

    • To investigate the genetic basis and inheritance pattern of ectopic testes in King-Holtzman rats.
    • To explore factors influencing the expression of the identified genetic defect.

    Main Methods:

    • Observation of ectopic testes in a rat colony.
    • Selective breeding experiments to study the heritability of the defect.
    • Genetic analysis to determine the mode of inheritance.

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    Main Results:

    • A heritable defect, designated the "ect" gene, was identified, causing ectopic testes in males.
    • The gene is autosomal recessive, as unaffected females carrying the gene produce no affected offspring when bred to normal males, but 25% of the F2 generation are affected.
    • Selective breeding revealed resistance to ect gene expression in some male genomes, indicating secondary, multifactorial control over trait expression thresholds.

    Conclusions:

    • The ectopic testes trait in King-Holtzman rats is controlled by an autosomal recessive gene (ect).
    • Gene expression is further modulated by secondary genetic factors, suggesting a multifactorial inheritance pattern for the specific manifestation (unilateral vs. bilateral).
    • This model provides insights into the complex genetic control of testicular descent.