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THE ESTABLISHMENT OF AN ALBINO RAT COLONY FREE FROM MIDDLE EAR DISEASE
1Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Selective breeding successfully created albino rats resistant to middle ear disease. This genetic selection also reduced advanced pneumonia cases, though overall pneumonia incidence remained high.
Area of Science:
- Otolaryngology
- Pulmonology
- Genetics
Background:
- Middle ear disease was prevalent in a rat population.
- A specific albino rat strain was developed through selective breeding.
Purpose of the Study:
- To establish a rat model resistant to middle ear disease.
- To investigate the genetic basis of disease resistance.
- To examine the impact of selection on pneumonia incidence.
Main Methods:
- Selective breeding and isolation of albino rats.
- Induction of stress factors (rachitic diet, overcrowding).
- Comparative analysis of middle ear disease and pneumonia incidence.
Main Results:
- Selected rats showed zero incidence of middle ear disease, compared to 57% in the precursor population.
- Stress factors did not induce middle ear disease in selected rats.
- Pneumonia incidence was 52% in selected rats vs. 78% in stock rats, with fewer advanced lesions.
Conclusions:
- Genetic selection is effective in preventing middle ear disease.
- The selected rat model offers insights into disease resistance mechanisms.
- Selection may influence the severity of other conditions like pneumonia.
