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Familial goiter in bongo antelope (Tragelaphus eurycerus).
S Doi1, S Shifrin, P Santisteban
1Laboratory of Biochemistry and Metabolism, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892.
Endocrinology
|August 1, 1990
Summary
Congenital defects in thyroglobulin synthesis were studied in bongo antelope, revealing unique high molecular weight thyroglobulin and albumin in thyroid extracts. These findings offer insights into thyroid regulation in this unique species.
Area of Science:
- Endocrinology
- Veterinary Medicine
- Zoology
Background:
- Congenital defects in thyroglobulin (Tg) synthesis serve as valuable animal models for studying thyroid hormone regulation.
- Previous studies have documented Tg synthesis defects in domestic animals like cattle, sheep, and goats.
Purpose of the Study:
- To investigate goiter and thyroglobulin synthesis in bongo antelope (Tragelaphus eurycerus), a non-domesticated African bovid.
- To characterize the molecular properties of thyroglobulin and associated proteins in affected animals.
Main Methods:
- Analysis of thyroid glands and colloid from three bongo antelope with and without visible goiter.
- Extraction and molecular weight characterization of thyroglobulin (Tg) and albumin from thyroid tissue.
- Assessment of circulating thyroid hormone levels to determine hormonal status.
Main Results:
- Thyroid extracts from bongo antelope exhibited a high molecular weight thyroglobulin component (>220K daltons), distinct from domestic cattle Tg.
- Albumin constituted over half of the total protein in thyroid colloid extracts.
- Affected bongo antelope were euthyroid, maintaining normal circulating thyroid hormone levels despite goiter.
Conclusions:
- Bongo antelope with goiter display unique characteristics in thyroglobulin structure and protein composition.
- These findings highlight species-specific variations in thyroid gland physiology and potential defects in thyroglobulin synthesis.
- Further research is warranted to elucidate the precise molecular mechanisms underlying goiter in this species.