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Prevalence of activating ras mutations in morphologically characterized thyroid nodules
Thyroid : Official Journal of the American Thyroid Association
|October 1, 1996
Summary
Ras mutations are uncommon in thyroid tumors, unlike in other cancers. This low prevalence may explain the generally indolent behavior of thyroid neoplasms and suggests alternative early genetic mutations are involved.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ras proteins are key signal transducers, with mutations in codons 12/13 or 61 affecting GTP-binding or GTPase activity.
- Activating Ras mutations are found in 30-50% of various malignancies, but their role in thyroid tumors is debated.
Purpose of the Study:
- To investigate the prevalence and types of ras gene mutations in human thyroid neoplasms.
- To explore the potential pathogenetic role of ras mutations in different thyroid tumor types.
Main Methods:
- Analysis of 45 thyroid carcinomas, adenomas, and hyperplastic nodules.
- Utilized single-stranded conformation polymorphism (SSCP) and DNA sequencing.
- Included cell lines with known mutations as controls.
Main Results:
- A low prevalence of ras gene family mutations was detected in thyroid neoplasms.
- Specific mutations identified include G to A H13 substitution in one papillary carcinoma and A to G N61 substitutions in two papillary carcinomas and one follicular adenoma.
- No H12, H61, N12/13, or K12/13/K61 ras mutations were found.
Conclusions:
- Ras mutations are infrequent in human thyroid neoplasms compared to other cancers.
- The low mutation rate may contribute to the indolent behavior of many thyroid tumors.
- Suggests alternative early genetic alterations are characteristic of thyroid neoplasms.