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Related Experiment Videos

Histological changes caused by the rc mutation in chickens

S Cerruti Sola1, M Castagnaro, K M Cheng

  • 1Dipartimento di Patologia Animale, Università degli Studi di Torino, Italy.

Journal of Comparative Pathology
|May 1, 1997
PubMed
Summary

The chicken rc gene mutation causes blindness and affects multiple organs, including the thyroid, liver, heart, thymus, kidney, and gonads. Lesions worsen with age, indicating a systemic impact of this genetic defect.

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Area of Science:

  • Genetics
  • Animal Pathology
  • Cell Biology

Background:

  • The 'rc' gene mutation in chickens causes retinal degeneration, blindness, and abnormal cardiac myocyte membranes.
  • This mutation is associated with reduced choline transport, suggesting a cellular-level defect.

Purpose of the Study:

  • To investigate the systemic effects of the 'rc' gene mutation on visceral organs.
  • To determine if the primary impact of the mutation is on cellular structure.

Main Methods:

  • Histological examination of visceral organs from young (5 months) and old (12 months) chickens.
  • Comparison of homozygous (rc/rc), heterozygous (Rc+/rc), and normal (Rc+/Rc+) chickens.

Main Results:

  • Homozygous birds exhibited significant visceral organ abnormalities: enlarged thyroids, liver lipid accumulation, cardiac myocyte changes, thymus hypertrophy, kidney tubular damage, and gonad degeneration.

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  • Lesions were more severe in older birds, with some heterozygous birds showing mild effects.
  • Normal chickens displayed no such abnormalities.

    • Conclusions:

    • The 'rc' gene mutation has widespread effects on chicken visceral organs, impacting cellular structure.
    • The severity of these lesions increases with age, highlighting the progressive nature of the mutation's effects.
    • The mutation's primary effect appears to be systemic and cellular, extending beyond the retina and heart.