Fork-shaped mandibular incisors as a novel phenotype of LRP5-associated disorder

Mamiko Yamada, Kazumi Kubota, Atsuro Uchida, Tatsuhiko Yagihashi, Masahito Kawasaki, Hisato Suzuki, Tomoko Uehara, Toshiki Takenouchi, Hiroshi Kurosaka, Kenjiro Kosaki

Research output: Contribution to journalArticlepeer-review

Abstract

The LRP5 gene encodes a Wnt signaling receptor to which Wnt binds directly. In humans, pathogenic monoallelic variants in LRP5 have been associated with increased bone density and exudative vitreoretinopathy. In mice, LRP5 plays a role in tooth development, including periodontal tissue stability and cementum formation. Here, we report a 14-year-old patient with a de novo non-synonymous variant, p.(Val1245Met), in LRP5 who exhibited mildly reduced bone density and mild exudative vitreoretinopathy together with a previously unreported phenotype consisting of dental abnormalities that included fork-like small incisors with short roots and an anterior open bite, molars with a single root, and severe taurodontism. In that exudative vitreoretinopathy has been reported to be associated with heterozygous loss-of-function variants of LRP5 and that our patient reported here with the p.(Val1245Met) variant had mild exudative vitreoretinopathy, the variant can be considered as an incomplete loss-of-function variant. Alternatively, the p.(Val1245Met) variant can be considered as exerting a dominant-negative effect, as no patients with truncating LRP5 variants and exudative vitreoretinopathy have been reported to exhibit dental anomalies. The documentation of dental anomalies in the presently reported patient strongly supports the notion that LRP5 plays a critical role in odontogenesis in humans, similar to its role in mice.

Original languageEnglish
Pages (from-to)1544-1549
Number of pages6
JournalAmerican Journal of Medical Genetics, Part A
Volume185
Issue number5
DOIs
Publication statusPublished - 2021 May

Keywords

  • LRP5
  • Wnt signaling pathway
  • aberrant teeth morphogenesis
  • low bone density

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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