Abstract
The left-right (L-R) asymmetric expression of lefty2 and nodal is controlled by a left side-specific enhancer (ASE). The transcription factor FAST2, which can mediate signaling by TGFβ and activin, has now been identified as a protein that binds to a conserved sequence in ASE. These FAST2 binding sites were both essential and sufficient for L-R asymmetric gene expression. The Fast2 gene is bilaterally expressed when nodal and lefty2 are expressed on the left side. TGFβ and activin can activate the ASE activity in a FAST2-dependent manner, while Nodal can do so in the presence of an EGF-CFC protein. These results suggest that the asymmetric expression of lefty2 and nodal is induced by a left side-specific TGFβ-related factor, which is most likely Nodal itself.
Original language | English |
---|---|
Pages (from-to) | 35-47 |
Number of pages | 13 |
Journal | Molecular Cell |
Volume | 5 |
Issue number | 1 |
DOIs | |
State | Published - Jan 2000 |
Bibliographical note
Funding Information:We thank M. Shen and A. Schier for mouse Cripto and Cryptic cDNA clones; Y. Eto for recombinant activin protein and activin cDNA; N. Ueno for BMP4 cDNA; C. Meno for nodal cDNA; A. Joyner and J. Rossant for hsp68lacZpA; T. Yokoyama and P. Overbeek for inv +/− mice; M. Brueckner for information on iv genotyping; and T. Miyama and T. Tanabe for technical assistance. We also thank E. Robertson and C. Wright for suggestions during the course of this work. This work was supported by CREST (Core Research for Evolutional Science and Technology) of the Japan Science and Technology Corporation (to H. Hamada), by Grants-in-Aid for Scientific Research from the Ministry of Education, Science, Sports, and Culture of Japan (to H. Hamada, K. Miyazono, and Y. Saijoh), by the Uehara Memorial Foundation (to Y. Saijoh), and by grants from NIH (to M. Whitman).