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Review Question - QID 687

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QID 687 (Type "687" in App Search)
The G-protein coupled family of receptors play a crucial role in transmembrane cytokine signaling. Point mutation in the Gs-alpha subunit of this receptor is responsible for a specific bone/soft tissue disease. Which of the following radiographs corresponds to this disease?
  • A
  • B
  • C
  • D
  • E

Figure A

16%

390/2404

Figure B

4%

90/2404

Figure C

6%

151/2404

Figure D

10%

236/2404

Figure E

63%

1515/2404

  • A
  • B
  • C
  • D
  • E

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Activating missense mutations in the GNAS1 gene encoding the Gs-alpha subunit of the G-protein family of receptors is associated with polyostotic fibrous dysplasia. This is shown by the proximal femur/acetabular "ground glass" lesions in Figure E.

Leet et al evaluated the functional and diagnostic features of these children and found that loss of femoral neck-shaft angle and involvement of the lower extremities had the greatest impact on function.

Bianco et al discuss the other implications of G-protein coupled receptor mutations outside of their effect on skeletal development.

Incorrect Answers:
Figure A represents an adamantinoma of the tibia.
Figure B shows the spickeled calcification of an enchondroma.
Figure C shows a destructive giant cell tumor of bone.
Figure D shows the "flowing wax" of melorheostosis.

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