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gsp mutations in human thyroid tumours.

H G Suarez1, J A du Villard, B Caillou

  • 1Institut de recherches Scientifiques sur le Cancer, CNRS, Villejuif, France.

Oncogene
|April 1, 1991
PubMed
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Gsp mutations in differentiated thyroid tumors were identified, leading to high constitutive adenylyl cyclase activity. These genetic alterations likely contribute to the development of thyroid carcinomas.

Area of Science:

  • Molecular biology
  • Endocrinology
  • Oncology

Background:

  • The Gs alpha protein (gsp) regulates adenylyl cyclase (AC) activity.
  • Thyroid-stimulating hormone (TSH) normally stimulates AC in differentiated thyroid cells.
  • Aberrant AC activity is implicated in thyroid tumor development.

Purpose of the Study:

  • To investigate the presence of gsp mutations in differentiated thyroid tumors.
  • To correlate gsp mutations with adenylyl cyclase activity (ACA) and TSH responsiveness.

Main Methods:

  • DNA extraction from 31 differentiated thyroid tumor samples.
  • Polymerase chain reaction (PCR) amplification of the gsp gene.
  • Oligonucleotide probing for mutation detection.

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Main Results:

  • Gsp mutations were detected in 3 out of 31 tumors.
  • Mutations were found at codons 201 (Arg201Ser) and 227 (Gln227His/Lys).
  • Tumors with mutations exhibited high constitutive ACA, unresponsive to TSH stimulation.

Conclusions:

  • Gsp mutations lead to constitutive activation of adenylyl cyclase.
  • These mutations may play a role in the tumorigenesis of differentiated thyroid carcinomas.
  • The findings link specific genetic alterations to thyroid cancer development.