ArticleDisease models & mechanisms2025
The class A repeats of LRP5 are required for normal development of bone, retinal vasculature and mammary gland in vivo.
Article in Disease models & mechanisms, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Low-density lipoprotein-related receptor 5 (LRP5) is an LDLR family member with well-defined roles in mediating Wnt signaling. Its domain structure includes four LDLR class B and three LDLR class A repeats. Class B repeats mediate binding with Wnt ligands and other effectors, while the role of the LRP5 class A repeats, known to interact with apolipoproteins within the LDLR, is unclear. Complete loss of the LRP5 gene in humans causes osteoporosis pseudoglioma, a syndrome characterized by early-onset osteoporosis and changes in retinal vascularization. We and others have previously created mice and rats completely deficient in LRP5 and reported the presence of bone and retinal vascularization defects. In this study, we created an allele of Lrp5 in mice in which the entire protein except for the class A repeats is present and expressed from the endogenous locus. Unlike in vitro studies using ectopic overexpression of LRP5, our in vivo data demonstrate that the class A repeats are essential for several normal LRP5 functions, including bone homeostasis, retinal vascularization and mammary gland development - phenotypes similar to those observed in Lrp5 null mice.
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