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J Med Genet. January 26, 2007; 282 (4): 2548-57.

FoxD3 and Grg4 physically interact to repress transcription and induce mesoderm in Xenopus.

Yaklichkin S , Steiner AB , Lu Q , Kessler DS .

FoxD3 is a forkhead-related transcriptional regulator that is essential for multiple developmental processes in the vertebrate embryo, including neural crest development and maintenance of mammalian stem cell lineages. Recent results demonstrate a requirement for FoxD3 in Xenopus mesodermal development. In the gastrula, FoxD3 functions as a transcriptional repressor in the Spemann organizer to maintain the expression of Nodal-related members of the transforming growth factor-beta superfamily that induce dorsal mesoderm formation. Here we report that the function of FoxD3 in mesoderm induction is dependent on the recruitment of transcriptional corepressors of the TLE/Groucho family. Structure-function analyses indicate that the transcriptional repression and mesoderm induction activities of FoxD3 are dependent on a C-terminal domain, as well as specific DNA-binding activity conferred by the forkhead domain. The C-terminal domain contains a heptapeptide similar to the eh1/GEH Groucho interaction motif. Deletion and point mutagenesis demonstrated that the FoxD3 eh1/GEH motif is required for both repression of transcription and induction of mesoderm, as well as the direct physical interaction of FoxD3 and Grg4 (Groucho-related gene-4). Consistent with a functional interaction of FoxD3 and Grg4, the transcriptional repression activity of FoxD3 is enhanced by Grg4, and reduced by Grg5, a dominant inhibitory Groucho protein. The results indicate that FoxD3 recruitment of Groucho corepressors is essential for the transcriptional repression of target genes and induction of mesoderm in Xenopus.

PubMed ID: 17138566
PMC ID: PMC1780074
Article link: J Med Genet.
Grant support: GM64768 NIGMS NIH HHS , R01 GM064768-01 NIGMS NIH HHS , R01 GM064768-02 NIGMS NIH HHS , R01 GM064768-03 NIGMS NIH HHS , R01 GM064768-04 NIGMS NIH HHS , R01 GM064768 NIGMS NIH HHS , R01 GM064768 NIGMS NIH HHS , GM64768 NIGMS NIH HHS

Genes referenced: aes foxd3 nodal tle4

Dehni, 1996, Pubmed[+]

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