How Rare Is Jackson-Weiss Syndrome?

How Rare Is Jackson-Weiss Syndrome? Mutations in the FGFR2 gene cause Jackson-Weiss syndrome. This gene provides instructions for making a protein called fibroblast growth factor receptor 2. Among its multiple functions, this protein signals immature cells to become bone cells during embryonic development. How does someone get Jackson-Weiss syndrome? Mutations in the FGFR2 gene cause