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  Receptor tyrosine kinase-like orphan receptor 2 (ROR2) and Indian hedgehog regulate digit outgrowth mediated by the phalanx-forming region

Witte, F., Chan, D., Economides, A. N., Mundlos, S., & Stricker, S. (2010). Receptor tyrosine kinase-like orphan receptor 2 (ROR2) and Indian hedgehog regulate digit outgrowth mediated by the phalanx-forming region. Proceedings of the National Academy of Sciences U S A, 107(32), 14211-14216. doi:10.1073/pnas.1009314107.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-7A8F-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-7A90-9
Genre: Journal Article
Alternative Title : Proc Natl Acad Sci U S A

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 Creators:
Witte, F.1, Author              
Chan, D., Author
Economides, A. N., Author
Mundlos, S.2, Author              
Stricker, S.2, Author              
Affiliations:
1Dept. of Computational Molecular Biology (Head: Martin Vingron), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433547              
2Research Group Development & Disease (Head: Stefan Mundlos), Max Planck Institute for Molecular Genetics, Max Planck Society, ou_1433557              

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Free keywords: bone morphogenetic protein signaling; brachydactyly; cartilage; limb development; Wnt signaling
 Abstract: Elongation of the digit rays resulting in the formation of a defined number of phalanges is a process poorly understood in mammals, whereas in the chicken distal mesenchymal bone morphogenetic protein (BMP) signaling in the so-called phalanx-forming region (PFR) or digit crescent (DC) seems to be involved. The human brachydactylies (BDs) are inheritable conditions characterized by variable degrees of digit shortening, thus providing an ideal model to analyze the development and elongation of phalanges. We used a mouse model for BDB1 (Ror2(W749X/W749X)) lacking middle phalanges and show that a signaling center corresponding to the chick PFR exists in the mouse, which is diminished in BDB1 mice. This resulted in a strongly impaired elongation of the digit condensations due to reduced chondrogenic commitment of undifferentiated distal mesenchymal cells. We further show that a similar BMP-based mechanism accounts for digit shortening in a mouse model for the closely related condition BDA1 (Ihh(E95K/E95K)), altogether indicating the functional significance of the PFR in mammals. Genetic interaction experiments as well as pathway analysis in BDB1 mice suggest that Indian hedgehog and WNT/beta-catenin signaling, which we show is inhibited by receptor tyrosine kinase-like orphan receptor 2 (ROR2) in distal limb mesenchyme, are acting upstream of BMP signaling in the PFR.

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Language(s): eng - English
 Dates: 2010-08-10
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
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Title: Proceedings of the National Academy of Sciences U S A
  Alternative Title : Proc Natl Acad Sci U S A
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 107 (32) Sequence Number: - Start / End Page: 14211 - 14216 Identifier: ISSN: 0027-8424