Antero-posterior tissue polarity links mesoderm convergent extension to axial patterning.

Abstract:

:Remodelling its shape, or morphogenesis, is a fundamental property of living tissue. It underlies much of embryonic development and numerous pathologies. Convergent extension (CE) of the axial mesoderm of vertebrates is an intensively studied model for morphogenetic processes that rely on cell rearrangement. It involves the intercalation of polarized cells perpendicular to the antero-posterior (AP) axis, which narrows and lengthens the tissue. Several genes have been identified that regulate cell behaviour underlying CE in zebrafish and Xenopus. Many of these are homologues of genes that control epithelial planar cell polarity in Drosophila. However, elongation of axial mesoderm must be also coordinated with the pattern of AP tissue specification to generate a normal larval morphology. At present, the long-range control that orients CE with respect to embryonic axes is not understood. Here we show that the chordamesoderm of Xenopus possesses an intrinsic AP polarity that is necessary for CE, functions in parallel to Wnt/planar cell polarity signalling, and determines the direction of tissue elongation. The mechanism that establishes AP polarity involves graded activin-like signalling and directly links mesoderm AP patterning to CE.

journal_name

Nature

journal_title

Nature

authors

Ninomiya H,Elinson RP,Winklbauer R

doi

10.1038/nature02620

keywords:

subject

Has Abstract

pub_date

2004-07-15 00:00:00

pages

364-7

issue

6997

eissn

0028-0836

issn

1476-4687

pii

nature02620

journal_volume

430

pub_type

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