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Title: Genetic evidence that SOST inhibits WNT signaling in the limb

Journal Article · · Developmental Biology
 [1];  [2];  [1];  [3];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)

SOST is a negative regulator of bone formation, and mutations in human SOST are responsible for sclerosteosis. In addition to high bone mass, sclerosteosis patients occasionally display hand defects, suggesting that SOST may function embryonically. Here we report that overexpression of SOST leads to loss of posterior structures of the zeugopod and autopod by perturbing anterior–posterior and proximal–distal signaling centers in the developing limb. Mutant mice that overexpress SOST in combination with Grem1 and Lrp6 mutations display more severe limb defects than single mutants alone, while Sost-/- significantly rescues the Lrp6-/- skeletal phenotype, signifying that SOST gain-of-function impairs limb patterning by inhibiting the WNT signaling through LRP5/6.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1839869
Report Number(s):
LLNL-JRNL-408192; 366998
Journal Information:
Developmental Biology, Vol. 342, Issue 2; ISSN 0012-1606
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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