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Developmental Biology
Article
License: Elsevier Non-Commercial
Data sources: UnpayWall
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Developmental Biology
Article . 2007
License: Elsevier Non-Commercial
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Developmental Biology
Article . 2007 . Peer-reviewed
License: Elsevier Non-Commercial
Data sources: Crossref
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Localization of Shh expression by Wnt and Eda affects axial polarity and shape of hairs

Authors: Hammerschmidt, Brigitte; Schlake, Thomas;

Localization of Shh expression by Wnt and Eda affects axial polarity and shape of hairs

Abstract

Axial patterning is a recurrent theme during embryonic development. To elucidate its fundamental principles, the hair follicle is an attractive model due to its easy accessibility and dispensability. Hair follicle asymmetry is evident from its angling and the localization of associated structures. However, axial patterning is not restricted to the follicle itself but also generates rotational hair shaft asymmetry which, for zigzag hairs, generates 3-4 bends that alternately point into opposite directions. Here we show by analyzing mutant and transgenic mice that WNT and ectodysplasin signaling are involved in the control of the molecular and morphological asymmetry of the follicle and the associated hair shaft, respectively. Asymmetry is affected by polarized WNT and ectodysplasin signaling in mature hair follicles. When endogenous signaling is impaired, molecular asymmetry is lost and mice no longer form zigzag hairs. Both signaling pathways affect the polarized expression of Shh which likely functions as a directional reference for hair shaft production in all follicles. We propose that this regulatory pathway also establishes follicular asymmetry during morphogenesis. Moreover, the identified molecular hierarchy offers a model for the periodic patterning of zigzag hairs mechanistically similar to mesodermal segmentation.

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Keywords

Ectodysplasin, Mice, Transgenic, Models, Biological, Wnt, Mice, Animals, Hedgehog Proteins, Insulin-Like Growth Factor I, Molecular Biology, In Situ Hybridization, Body Patterning, DNA Primers, Hair follicle, Axial patterning, Sonic hedgehog, Gene Expression Regulation, Developmental, Cell Biology, Ectodysplasins, beta-Galactosidase, Wnt Proteins, Intercellular Signaling Peptides and Proteins, Hair Follicle, Developmental Biology, Signal Transduction

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
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    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
32
Top 10%
Top 10%
Top 10%
hybrid