ZFIN ID: ZDB-PUB-001026-7
Role of the zebrafish trilobite locus in gastrulation movements of convergence and extension
Sepich, D.S., Myers, D.C., Short, R., Topczewski, J., Marlow, F., and Solnica-Krezel, L.
Date: 2000
Source: Genesis (New York, N.Y. : 2000)   27(4): 159-173 (Journal)
Registered Authors: Marlow, Florence, Myers, Dina, Sepich, Diane, Solnica-Krezel, Lilianna, Topczewski, Jacek
Keywords: morphology; gastrula; cell movement; Danio rerio; morphogenesis
MeSH Terms:
  • Animals
  • Arthropods/anatomy & histology
  • Arthropods/embryology*
  • Arthropods/genetics
  • Body Patterning/genetics
  • Body Patterning/physiology*
  • Cadherins/biosynthesis
  • Cadherins/genetics
  • Cell Movement/genetics
  • Cell Movement/physiology*
  • Fossils
  • Gastrula/physiology*
  • Gene Expression Regulation, Developmental/physiology
  • Mutation/genetics
  • Proto-Oncogene Proteins/biosynthesis
  • Proto-Oncogene Proteins/genetics
  • T-Box Domain Proteins/biosynthesis
  • T-Box Domain Proteins/genetics
  • Wnt Proteins
  • Zebrafish/anatomy & histology
  • Zebrafish/embryology*
  • Zebrafish Proteins*
PubMed: 10992326 Full text @ Genesis
ABSTRACT
Summary: Convergence and extension are gastrulation movements that participate in the establishment of the vertebrate body plan. Using new methods for quantifying convergence and extension movements of cell groups, we demonstrate that in wild-type embryos, dorsal convergence of lateral cells is initially slow, but speeds up between the end of the gastrula period and early segmentation. Convergence and extension movements of lateral cells in trilobite mutants are normal during the gastrula period but reduced by early segmentation. Morphometric studies revealed that during epiboly wild-type gastrulae become ovoid, whereas trilobite embryos remain rounder. By segmentation, trilobite embryos exhibit shorter, broader embryonic axes. The timing of these morphological defects correlates well with impaired cell movements, suggesting reduced convergence and extension are the main defects underlying the trilobite phenotype. Our gene expression, genetic, and fate mapping analyses show the trilobite mutation affects movements without altering dorsoventral patterning or cell fates. We propose that trilobite function is required for cell properties that promote increased speed of converging cells and extension movements in the dorsal regions of the zebrafish gastrula. genesis 27:159-173, 2000.
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