DOI: 10.1242/dev.128.20.3937. Cell autonomous commitment to an endodermal fate and behaviour by activation of Nodal signalling

Cell autonomous commitment to an endodermal fate and behaviour by activation of Nodal signalling

10.1242/dev.128.20.3937

Crossref journal-article

The Company of Biologists

Development (237)

Abstract

In vertebrates the endoderm germ layer gives rise to most tissues of the digestive tract and controls head and heart morphogenesis. The induction of endoderm development relies on extracellular signals related to Nodals and propagated intracellularly by TGFβ type I receptors ALK4/Taram-A. It is unclear, however, whether Nodal/ALK4/Taram-A signalling is involved only in the specification of endodermal precursors or plays a more comprehensive role in the activation of the endodermal program leading to the irreversible commitment of cells to the endodermal fate. Using cell transplantation experiments in zebrafish, we show that marginal cells become committed to endoderm at the onset of gastrulation and that commitment to endoderm can be reached by intracellular activation of the Nodal pathway induced by expression of an activated form of the taram-A receptor, Tar*. In a manner similar to endoderm progenitors, Tar*-activated blastomeres translocate from their initial site of implantation in the blastoderm to reach the surface of their migration substratum, the yolk syncitial layer, where they join endogenous endodermal derivatives during gastrulation and differentiate according to their anteroposterior position. We demonstrate that Nodal/Tar*-induced commitment does not rely on a secondary signal released by Tar*-expressing cells or a signal released by endogenous endoderm since Tar*-expressing wild-type cells can restore endoderm derivatives when transplanted into the endoderm-deficient mutant casanova. Likewise, the YSL does not appear essential for the maintenance of endodermal identity during gastrulation once the Nodal pathway has been activated. Thus, our results demonstrate that the activation of Nodal signalling is sufficient to commit cells both to an endodermal fate and behaviour. Wild-type endoderm implantation into casanova embryos rescues, in a non-autonomous fashion, the defective fusion of the two heart primordia in the midline, highlighting the importance of endoderm for normal heart morphogenesis.

Bibliography

David, N. B., & Rosa, F. M. (2001). Cell autonomous commitment to an endodermal fate and behaviour by activation of Nodal signalling. Development, 128(20), 3937â3947.

Authors 2

Nicolas B. David (first)
Frédéric M. Rosa (additional)

References 46 Referenced 95

Dates

Type	When
Created	4 years, 4 months ago (April 26, 2021, 12:36 a.m.)
Deposited	2 years, 8 months ago (Dec. 25, 2022, 6:57 a.m.)
Indexed	2 months, 1 week ago (June 27, 2025, 9:04 a.m.)
Issued	23 years, 10 months ago (Oct. 15, 2001)
Published	23 years, 10 months ago (Oct. 15, 2001)
Published Print	23 years, 10 months ago (Oct. 15, 2001)

Funders 0

None

BibTeX

@article{David_2001, title={Cell autonomous commitment to an endodermal fate and behaviour by activation of Nodal signalling}, volume={128}, ISSN={0950-1991}, url={http://dx.doi.org/10.1242/dev.128.20.3937}, DOI={10.1242/dev.128.20.3937}, number={20}, journal={Development}, publisher={The Company of Biologists}, author={David, Nicolas B. and Rosa, Frédéric M.}, year={2001}, month=oct, pages={3937–3947} }

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        10,
        15
      ]
    ]
  },
  "references-count": 46,
  "journal-issue": {
    "issue": "20",
    "published-print": {
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        [
          2001,
          10,
          15
        ]
      ]
    }
  },
  "URL": "http://dx.doi.org/10.1242/dev.128.20.3937",
  "relation": {},
  "ISSN": [
    "1477-9129",
    "0950-1991"
  ],
  "subject": [],
  "published": {
    "date-parts": [
      [
        2001,
        10,
        15
      ]
    ]
  }
}