Abstract
The secreted polypeptide noggin (encoded by the Nog gene) binds and inactivates members of the transforming growth factor β superfamily of signalling proteins (TGFβ-FMs), such as BMP4 (ref. 1). By diffusing through extracellular matrices more efficiently than TGFβ-FMs, noggin may have a principal role in creating morphogenic gradients2. During mouse embryogenesis, Nog is expressed at multiple sites3, including developing bones4,5. Nog-/- mice die at birth from multiple defects that include bony fusion of the appendicular skeleton3,4. We have identified five dominant human NOG mutations in unrelated families segregating proximal symphalangism (SYM1; OMIM 185800) and a de novo mutation in a patient with unaffected parents. We also found a dominant NOG mutation in a family segregating multiple synostoses syndrome (SYNS1; OMIM 186500); both SYM1 and SYNS1 have multiple joint fusion as their principal feature6,7. All seven NOG mutations alter evolutionarily conserved amino acid residues. The findings reported here confirm that NOG is essential for joint formation and suggest that NOG requirements during skeletogenesis differ between species and between specific skeletal elements within species.
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Acknowledgements
We thank the patients and their families for participating; V. McKusick and M. Abbott for providing Fig. 1b; and J. Hurvitz, R.T. Ballock, E. Eichler, I. McIntosh, H. Willard, J. Moeschler and C. Hall for sharing resources and their clinical and scientific expertise. This work was supported by NIH grants AR-43827, HD-22657 and HD-01205, and by the March of Dimes Birth Defects Foundation.
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Gong, Y., Krakow, D., Marcelino, J. et al. Heterozygous mutations in the gene encoding noggin affect human joint morphogenesis. Nat Genet 21, 302–304 (1999). https://doi.org/10.1038/6821
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DOI: https://doi.org/10.1038/6821
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