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X-linked severe combined immunodeficiency in the dog
P F Jezyk1, P J Felsburg, M E Haskins
1Section of Medical Genetics, School of Veterinary Medicine, University of Pennsylvania, Philadelphia 19104.
Clinical Immunology and Immunopathology
|August 1, 1989
Summary
A canine form of X-linked severe combined immunodeficiency (SCID) mirrors human SCID, causing severe infections and death in pups. This genetic disorder affects B cell differentiation and T cell function, impacting immunoglobulin production.
Area of Science:
- Immunology
- Genetics
- Veterinary Medicine
Background:
- X-linked severe combined immunodeficiency (SCID) is a critical primary immunodeficiency in humans.
- Understanding SCID in animal models offers insights into human disease pathogenesis and potential therapies.
Purpose of the Study:
- To document a novel form of X-linked severe combined immunodeficiency (SCID) in dogs.
- To characterize the clinical, immunological, and pathological features of this canine SCID model.
- To investigate the mode of inheritance for this canine immunodeficiency.
Main Methods:
- Clinical observation and pathological examination of affected canine pups.
- Immunological assays including lymphocyte counts, serum immunoglobulin levels, and mitogenic response tests.
- Pedigree analysis and breeding studies to determine the mode of inheritance.
Main Results:
- Canine SCID pups exhibited growth retardation and severe susceptibility to bacterial and viral infections.
- Laboratory findings revealed normal B cells but deficient IgG and IgA production, alongside impaired T cell responses.
- Postmortem analysis showed thymic dysplasia and lymphoid hypoplasia.
- Inheritance patterns were consistent with an X-linked recessive trait.
Conclusions:
- A canine model of X-linked SCID has been identified with features analogous to human X-linked SCID.
- The disease results from a defect in B cell terminal differentiation and T cell function.
- This canine model is valuable for studying SCID pathogenesis and developing therapeutic strategies.