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Significance The transcription factors VegT and Mix1 are markers of the future gut (presumptive endoderm) of the frogXenopus laevis. VegT and Mix1 proteins localized to the embryo vegetal hemisphere, providing an equivalent identity to the presumptive endoderm in the five frog species that were analyzed. Moreover, VegT protein localized to the animal hemisphere in embryos of all frogs. Similarly,vegt transcripts relocalized to the dorso-animal region of the egg after fertilization inX. laevis , suggesting thatvegt may participate in dorsal development. In addition,vegt transcripts relocalized around vegetal nuclei ofX. laevis embryos. This relocalization may provide endodermal identity to the large vegetal cells. The results suggest conservation of the developmental strategies for endoderm and dorsal specification in frogs.

Transcription factors Mix1 and VegT, relocalization of vegt mRNA, and conserved endoderm and dorsal specification in frogs