First published online December 30, 2003
Development 131, 204e (2004)
© The Company of Biologists Limited
Heads up for Twisted gastrulation
Bone morphogenetic proteins (Bmps), which regulate cell-cell signalling in
animal development, are controlled by a network of secreted proteins including
Twisted gastrulation (Tsg). Tsg can inhibit or promote Bmp signalling,
depending on the developmental system. On
p. 413, Zakin and De
Robertis investigate Tsg regulation of Bmp4 signalling during mouse
development. The researchers describe how targeted inactivation of the
Tsg gene alone results in undersized mice with mild vertebral
defects. Similarly, previous studies have indicated that
Bmp+/- mice have only mild defects. By contrast, the
Tsg-/-, Bmp4+/- compound mutants
derived by Zakin and De Robertis die at birth and have major brain
abnormalities, including holoprosencephaly, a disorder in which the embryonic
forebrain fails to divide into two lobes. These results indicate that Tsg acts
to promote Bmp4 signalling during forebrain development.

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Related articles in Development:
- Inactivation of mouse Twisted gastrulation reveals its role in promoting Bmp4 activity during forebrain development
- Lise Zakin and E. M. De Robertis
Development 2004 131: 413-424.
[Abstract]
[Full Text]