LRP4 Mutations and Wnt Signaling in Bone and Limb Development

Low-density lipoprotein receptor-related protein 4 (LRP4) has emerged as a central modulator of skeletal patterning and homeostasis through its capacity to regulate canonical Wnt/β-catenin signalling. In concert with co-receptors LRP5/6, and in association with extracellular antagonists such as sclerostin and Dickkopf 1 (Dkk1), LRP4 determines the intensity and spatial distribution of Wnt signals that direct osteoblast differentiation, chondrocyte maturation and limb morphogenesis. Mutations in LRP4 give rise to a spectrum of developmental disorders, ranging from congenital syndactyly and limb hypoplasia to high bone mass phenotypes, by perturbing the inhibitory feedback loops that normally restrain Wnt-driven bone formation. At the cellular level, LRP4 variants alter ligand-receptor interactions within osteogenic lineages, dysregulate bone remodelling cell–cell communication and interfere with growth plate cartilage dynamics. Recent mechanistic work has further elucidated how domain-specific substitutions in LRP4 impair its binding to sclerostin or agrin, thereby unleashing aberrant β-catenin activation. Collectively, these insights highlight LRP4 as a pivotal integrator of extracellular cues that orchestrate bone deposition, resorption and the precise sculpting of limb elements during embryogenesis and postnatal growth.

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LRP4 Mutations and Wnt Signaling in Bone and Limb Development publication trend

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Technical terms

LRP4: A transmembrane member of the low-density lipoprotein receptor family that modulates Wnt signalling by binding ligands and inhibitors.

Wnt/β-catenin signalling: A canonical pathway in which Wnt ligands stabilise β-catenin to regulate gene expression governing cell fate and differentiation.

Sclerostin: An osteocyte-secreted glycoprotein that inhibits Wnt co-receptors to suppress bone formation.

Dickkopf 1 (Dkk1): A secreted antagonist of Wnt signalling that binds LRP co-receptors to block pathway activation.

β-propeller domain: A structural motif in LRP proteins comprising radially arranged β-sheets that mediate ligand interactions.

References

1. Rare Variants in LRP4 Are Associated with Mesiodens, Root Maldevelopment, and Oral Exostoses in Humans. Biology (2023).
2. Bone Overgrowth-associated Mutations in the LRP4 Gene Impair Sclerostin Facilitator Function*. Journal of Biological Chemistry (2011).
3. Lrp4, a Novel Receptor for Dickkopf 1 and Sclerostin, Is Expressed by Osteoblasts and Regulates Bone Growth and Turnover In Vivo. PLOS ONE (2009).
4. Identification of Compound Heterozygous Variants in LRP4 Demonstrates That a Pathogenic Variant outside the Third β-Propeller Domain Can Cause Sclerosteosis. Genes (2021).