AMACO is a component of the basement membrane-associated fraser complex

Rebecca J. Richardson, Jan M. Gebauer, Jin Li Zhang, Birgit Kobbe, Douglas R. Keene, Kristina Røkenes Karlsen, Stefânia Richetti, Alexander P. Wohl, Gerhard Sengle, Wolfram F. Neiss, Mats Paulsson, Matthias Hammerschmidt*, Raimund Wagener

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

8 Citations (Scopus)
419 Downloads (Pure)

Abstract

Fraser syndrome (FS) is a phenotypically variable, autosomal recessive disorder characterized by cryptophthalmus, cutaneous syndactyly, and other malformations resulting from mutations in FRAS1, FREM2, and GRIP1. Transient embryonic epidermal blistering causes the characteristic defects of the disorder. Fras1, Frem1, and Frem2 form the extracellular Fraser complex, which is believed to stabilize the basement membrane. However, several cases of FS could not be attributed to mutations in FRAS1, FREM2, or GRIP1, and FS displays high clinical variability, suggesting that there is an additional genetic, possibly modifying contribution to this disorder. An extracellular matrix protein containing VWA-like domains related to those in matrilins and collagens (AMACO), encoded by the VWA2 gene, has a very similar tissue distribution to the Fraser complex proteins in both mouse and zebrafish. Here, we show that AMACO deposition is lost in Fras1-deficient zebrafish and mice and that Fras1 and AMACO interact directly via their chondroitin sulfate proteoglycan (CSPG) and P2 domains. Knockdown of vwa2, which alone causes no phenotype, enhances the phenotype of hypomorphic Fras1 mutant zebrafish. Together, our data suggest that AMACO represents a member of the Fraser complex.

Original languageEnglish
Pages (from-to)1313-1322
Number of pages10
JournalJournal of Investigative Dermatology
Volume134
Issue number5
Early online date19 Dec 2013
DOIs
Publication statusPublished - 1 Jan 2014

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