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Review Question - QID 251

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QID 251 (Type "251" in App Search)
A genetic abnormality in the cyclic AMP signaling pathway is involved in which of the following conditions?

Achondroplasia

10%

190/1958

Hypochondroplasia

4%

69/1958

Multiple hereditary exostosis

13%

248/1958

Fibrous dysplasia

66%

1295/1958

Neurofibromatosis type I

8%

151/1958

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The genetic defect in fibrous dysplasia involves a G protein that affects the cAMP signaling pathway.

The first references by Lietman et al mentions a novel technique using a polymerase chain reaction to detect mutations in genomic DNA from peripheral blood cells in patients with fibrous dysplasia.

The second reference by DiCaprio et al is a review article describing the pathophysiology, evaluation, and treatment of fibrous dysplasia. Achondroplasia and hypochondroplasia are caused by a mutation in the FGFR3 gene. Multiple hereditary exostosis is caused by a mutation in the EXT1 gene. Neurofibromatosis involves a mutation in the NF1 gene that codes for neurofibromin.

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