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Biochem Biophys Res Commun April 12, 2002; 292 (4): 1081-6.

Antimorphic PV.1 causes secondary axis by inducing ectopic organizer.

Hwang YS , Seo JJ , Cha SW , Lee HS , Lee SY , Roh DH , Kung Hf HF , Kim J , Ja Park M .

Xenopus homeobox gene, PV.1 ventralizes activin-induced dorsal mesoderm and inhibits neuralization of ectoderm in animal cap when overexpressed. Here we generated PV.1/engrailed fusion construct (N-PV1-EnR) to perform loss-of-function study for this transcription factor. N-PV1-EnR showed an extremely antimorphic effect, causing a partial secondary embryonic axis when expressed at ventral marginal zone of blastula. In ventral marginal zone cells, this chimeric protein induced organizer genes and suppressed ventral markers mimicking those effects reported for dominant negative BMP-4 receptor (DNBR). Moreover, N-PV1-EnR rescued the ventralized embryos caused by the ectopic dorsal expression of PV.1 but not by that of Xvent-2. These results suggested that PV.1 functions at downstream of BMP-4 as a ventralizing effector which acts separately from Xvent-2 and the dominant negative effect gained by this specific mutant is applicable for the further studies of BMP-4 downstream pathway.

PubMed ID: 11944926
Article link: Biochem Biophys Res Commun

Genes referenced: bmp4 chrd.1 evx1 ncam1 not ventx1.1 ventx2.1 ventx2.2

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