Xenbase Image ID: 1014

Fig. 5. Regulation and function of Xenopus hhex. (A) Analysis of hhex expression by in situ hybridization to bisected stage-18 embryos (anterior left). (a) Schematic of a stage-18 bisected embryo showing the presumptive foregut (fg, green) and hindgut domain (hg). (b) Injection of GR-LEFδN-βCTA RNA (800 pg) into the D1 anterior endoderm cell has no effect without Dex. (c) Addition of Dex (1 μM) at the midgastrula repressed hhex expression as does (d) D1 injection of stabilized pt-β-catenin RNA (250 pg). (e) Uninjected control embryo. (f) Injection of δNTcf3 RNA (800 pg) or (g) Gsk3β RNA (500 pg) in posterior D4 cells results in ectopic hhex expression (arrowhead). (h) Co-injection of Gsk3β and β-gal RNA reveals that the blue β-gal stain co-localizes with ectopic hhex in the endoderm. (B) Hhex is required for liver and pancreas development. 32-cell stage embryos were injected with either an antisense hhex morpholino oligo (HexMO, 80 ng) in the D1 cells or with Gsk3β or Gsk3β plus HexMO in D4 cells. At stage 35, embryos were assayed by in situ hybridization with liver (for1) or pancreas/duodenum (pdx1) probes. Image published in: McLin VA et al. (2007) Copyright © 2007. Image reproduced with permission of the publisher and the copyright holder. This is an Open Access article distributed under the terms of the Creative Commons Attribution License. Gene Synonyms Species Stage(s) Tissue hhex.L hex, tHex, XHex X. laevis Throughout NF stage 18 archenteron nr1h5.L for1 X. laevis Throughout NF stage 35 and 36 liver pdx1.S ipf1, pdx-1, STF-1, XlHbox-8, XlHbox8 X. laevis Throughout NF stage 35 and 36 exocrine pancreas duodenum Image source: Published Experiment + Assay Source Phenotypes and Disease Xla Wt + Mmu.lef1-Mmu.ctnnb1-GR + DEX + NF18 (in situ hybridization) Fig.5.A.c Expression Phenotype decreased amount hhex.L expression in foregut endoderm Xla Wt + ctnnb1tm1 + NF18 (in situ hybridization) Fig.5.A.d Expression Phenotype decreased amount hhex.L expression in foregut endoderm Xla Wt + dntcf3-GR + NF18 (in situ hybridization) Fig.5.A.f Expression Phenotype mislocalised hhex.L expression in hindgut primordium Xla Wt + gsk3b + NF18 (in situ hybridization) Fig.5.A.g.h Expression Phenotype mislocalised hhex.L expression in hindgut primordium Xla Wt + gsk3b + NF35/36 (in situ hybridization) Fig.5.B Expression Phenotype mislocalised nr1h5.L expression in endoderm mislocalised pdx1.L expression in endoderm Xla Wt + hhex MO + NF35/36 (in situ hybridization) Fig.5.B Anatomical Phenotype absent dorsal pancreatic bud absent ventral pancreatic bud Expression Phenotype decreased amount nr1h5.L expression in liver decreased amount pdx1.L expression in dorsal pancreatic bud decreased amount pdx1.L expression in ventral pancreatic bud Larger Image Printer Friendly View

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