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

K I Pinson ¹, J Brennan , S Monkley

⁰Department of Molecular and Cell Biology, University of California, Berkeley 94720, USA.

Nature +

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October 12, 2000

View abstract on PubMed

Summary

Low-density lipoprotein receptor-related protein 6 (LRP6) is crucial for mammalian Wnt signaling. Its mutation causes developmental defects, highlighting LRP6

Area Of Science

Developmental Biology
Molecular Genetics
Cell Signaling

Background

Wnt proteins are key secreted factors in embryonic development, regulating body axis patterning, central nervous system and limb development, and organogenesis.
While Wnt signaling pathways are partially understood, the mechanisms by which Wnt proteins and their Frizzled receptors transmit signals to downstream effectors remain unclear.

Purpose Of The Study

To investigate the role of a novel low-density lipoprotein (LDL)-receptor-related protein family member, LRP6, in Wnt signaling during mammalian development.

Main Methods

Analysis of mouse embryos with an insertion mutation in the LRP6 gene.
Examination of developmental defects in LRP6-deficient embryos.
Genetic analysis of Wnt mutant phenotypes in mice with varying LRP6 gene copy numbers.

Main Results

Homozygous LRP6-deficient mouse embryos display developmental abnormalities that mirror defects seen in mutations of individual Wnt genes.
Reduced LRP6 gene dosage genetically enhances the phenotype of existing Wnt mutations.

Conclusions

LRP6 plays a critical role in transducing signals from multiple Wnt ligands in mammals.
LRP6 is essential for normal embryonic development, acting as a key component in Wnt signal transduction.

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