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Nature July 25, 1996; 382 (6589): 357-60.
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BMP-4-responsive regulation of dorsal-ventral patterning by the homeobox protein Mix.1.

Mead PE , Brivanlou IH , Kelley CM , Zon LI .

In an expression screen for factors that pattern or induce ventral mesoderm, we isolated a complementary DNA encoding Mix.1, a paired class homeobox gene with no previously known function. Injection of Mix.1 messenger RNA results in extensive blood formation in the whole embryo and transforms dorsal mesoderm to a ventral fate. Mix.1 expression is induced by bone morphogenetic protein-4 (BMP-4), and a dominant inhibitory mutant of Mix.1 can restore a dorsal axis in embryos ventralized by ectopic BMP-4 expression. Mix.1 can form heterodimers with the dorsalizing gene siamois, which encodes a homeodomain protein that is structurally similar to Mix.1. Furthermore, Mix.1 blocks the duplicated axis induced by ectopic siamois expression. Our findings indicate that Mix.1 participates in a BMP-4 signalling pathway to pattern ventral mesoderm, and suggest a model whereby dimerization of homeodomain proteins regulates dorsal-ventral patterning.

PubMed ID: 8684465
Article link: Nature

Species referenced: Xenopus
Genes referenced: bmp4 mix1 sia1