Conserved regulation of Nodal-mediated left-right patterning in zebrafish and mouse
Nodal is the major effector of left-right axis development. In mice, Nodal forms heterodimers with Gdf1 and is inhibited by Cerl2/Dand5 at the node, and by Lefty1 in the lateral plate mesoderm (LPM). Studies in zebrafish have suggested some parallels, but also differences, between left-right pattern...
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Published in | Development (Cambridge) Vol. 145; no. 24 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
England
The Company of Biologists Ltd
10.12.2018
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Subjects | |
Online Access | Get full text |
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Summary: | Nodal is the major effector of left-right axis development. In mice, Nodal forms heterodimers with Gdf1 and is inhibited by Cerl2/Dand5 at the node, and by Lefty1 in the lateral plate mesoderm (LPM). Studies in zebrafish have suggested some parallels, but also differences, between left-right patterning in mouse and zebrafish. To address these discrepancies, we generated single and double zebrafish mutants for
(
, the
ortholog),
and
, and performed biochemical and activity assays with Spaw and Vg1/Gdf3 (the Gdf1 ortholog). Contrary to previous findings,
mutants failed to initiate
expression in the LPM, and asymmetric heart looping was absent, similar to mouse
mutants. In blastoderm assays, Vg1 and Spaw were interdependent for target gene induction, and contrary to previous results, formed heterodimers. Loss of Dand5 or Lefty1 caused bilateral
expression, similar to mouse mutants, and Lefty1 was replaceable with a uniform Nodal signaling inhibitor. Collectively, these results indicate that Dand5 activity biases Spaw-Vg1 heterodimer activity to the left, Spaw around Kupffer's vesicle induces the expression of
in the LPM and global Nodal inhibition maintains the left bias of Spaw activity, demonstrating conservation between zebrafish and mouse mechanisms of left-right patterning. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Present address: School of Biological Sciences, University of Utah, Salt Lake City, UT 84112, USA. |
ISSN: | 0950-1991 1477-9129 |
DOI: | 10.1242/dev.171090 |