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Am J Hum Genet. 2013 Apr 4;92(4):565-74. doi: 10.1016/j.ajhg.2013.02.010. Epub 2013 Mar 14.

Mutations in WNT1 cause different forms of bone fragility.

Author information

1
Institute of Human Genetics, University Hospital Cologne, University of Cologne, 50931 Cologne, Germany.

Abstract

We report that hypofunctional alleles of WNT1 cause autosomal-recessive osteogenesis imperfecta, a congenital disorder characterized by reduced bone mass and recurrent fractures. In consanguineous families, we identified five homozygous mutations in WNT1: one frameshift mutation, two missense mutations, one splice-site mutation, and one nonsense mutation. In addition, in a family affected by dominantly inherited early-onset osteoporosis, a heterozygous WNT1 missense mutation was identified in affected individuals. Initial functional analysis revealed that altered WNT1 proteins fail to activate canonical LRP5-mediated WNT-regulated β-catenin signaling. Furthermore, osteoblasts cultured in vitro showed enhanced Wnt1 expression with advancing differentiation, indicating a role of WNT1 in osteoblast function and bone development. Our finding that homozygous and heterozygous variants in WNT1 predispose to low-bone-mass phenotypes might advance the development of more effective therapeutic strategies for congenital forms of bone fragility, as well as for common forms of age-related osteoporosis.

PMID:
23499309
PMCID:
PMC3617378
DOI:
10.1016/j.ajhg.2013.02.010
[Indexed for MEDLINE]
Free PMC Article

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