An LDL-receptor-related protein mediates Wnt signalling in mice

Kathleen I. Pinson, Jane Brennan, Susan Monkley, Brian J. Avery and William C. Skarnes ()
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Kathleen I. Pinson: Harvard University
Jane Brennan: University of California
Susan Monkley: University of California
Brian J. Avery: University of California
William C. Skarnes: University of California

Nature, 2000, vol. 407, issue 6803, 535-538

Abstract: Abstract Wnt genes comprise a large family of secreted polypeptides that are expressed in spatially and tissue-restricted patterns during vertebrate embryonic development1. Mutational analysis in mice has shown the importance of Wnts in controlling diverse developmental processes such as patterning of the body axis, central nervous system and limbs, and the regulation of inductive events during organogenesis2. Although many components of the Wnt signalling pathway have been identified, little is known about how Wnts and their cognate Frizzled receptors signal to downstream effector molecules. Here we present evidence that a new member of the low-density lipoprotein (LDL)-receptor-related protein family, LRP6 (ref. 3), is critical for Wnt signalling in mice. Embryos homozygous for an insertion mutation in the LRP6 gene exhibit developmental defects that are a striking composite of those caused by mutations in individual Wnt genes. Furthermore, we show a genetic enhancement of a Wnt mutant phenotype in mice lacking one functional copy of LRP6. Together, our results support a broad role for LRP6 in the transduction of several Wnt signals in mammals.

Date: 2000
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DOI: 10.1038/35035124

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