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[Insulin receptor abnormality and its clinical aspect]
1Second Department of Internal Medicine, Chiba University School of Medicine.
Nihon Rinsho. Japanese Journal of Clinical Medicine
|August 14, 1998
Summary
Genetic defects in the insulin receptor gene cause severe insulin resistance syndromes. This study details three new families with insulin receptor gene abnormalities, furthering our understanding of these rare conditions.
Area of Science:
- Genetics
- Endocrinology
- Molecular Biology
Background:
- Since the cloning of human insulin receptor cDNA in 1985, approximately 50 cases of insulin receptor abnormalities have been documented.
- These abnormalities are associated with severe insulin resistance syndromes, including Type A insulin resistance, Leprechaunism, and Rabson-Mendenhall syndrome.
Observation:
- This study reports on three families (Type C (Chiba), Type A (Yamanashi), and Type C (Hokkaidou-2)) with distinct insulin receptor gene abnormalities.
- Specific mutations identified include deletions in exons 17-22 (Type C (Chiba)) and exon 14 (Type A (Yamanashi)), and a missense mutation (G1008V) in the tyrosine kinase domain (Type C (Hokkaidou-2)).
Findings:
- All affected individuals presented with clinical symptoms characteristic of Type A insulin resistance.
- Insulin resistance exhibited dominant inheritance patterns in the Type C (Chiba) and Type C (Hokkaidou-2) families, but not in the Type A (Yamanashi) family.
Implications:
- These findings expand the known spectrum of insulin receptor gene mutations causing severe insulin resistance.
- Understanding genotype-phenotype correlations is crucial for diagnosing and managing these rare genetic disorders.