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Does a Leu 512 Arg thyrotropin receptor mutation cause an autonomously functioning papillary carcinoma?
Hulya Gozu1, Melike Avsar, Rifat Bircan
1Section of Endocrinology and Metabolism, Marmara University Medical School, Istanbul, Turkey. hgozu@hotmail.com
Thyroid : Official Journal of the American Thyroid Association
|January 27, 2005
Summary
Activating mutations in the thyrotropin receptor (TSHR) gene were identified in a rare case of autonomously functioning papillary carcinoma. This finding suggests TSHR mutations contribute to both toxic nodules and malignancy in the thyroid.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Previous studies identified Gsalpha and TSHR mutations in benign autonomously functioning thyroid nodules (AFTN).
- The role of TSHR genetic alterations in malignant AFTN remains poorly understood.
- Limited case reports exist on TSHR mutations in malignant thyroid conditions.
Observation:
- A patient with toxic multinodular goiter and papillary carcinoma underwent thyroidectomy.
- Genomic DNA from the hot nodule and leukocytes was analyzed for TSHR and Gsalpha gene mutations.
- Single-strand conformation polymorphism (SSCP) and DNA sequencing identified a TSHR mutation.
Findings:
- An activating mutation (Leu 512 Arg) in the TSHR gene was discovered in the autonomously functioning papillary carcinoma.
- This mutation likely leads to constitutive activation of the cyclic adenosine monophosphate (cAMP) signaling pathway.
- The TSHR mutation is implicated in causing thyrotoxicosis and a "hot" nodule within the malignant tumor.
Implications:
- This case highlights the potential role of TSHR mutations in the development of functioning thyroid carcinomas.
- Understanding these genetic alterations can improve diagnostic and therapeutic strategies for thyroid cancer.
- Further research is warranted to explore the broader implications of TSHR mutations in thyroid tumorigenesis.