Frontiers in Cell and Developmental Biology (Apr 2021)

Heterozygous Recurrent Mutations Inducing Dysfunction of ROR2 Gene in Patients With Short Stature

  • Baoheng Gui,
  • Baoheng Gui,
  • Baoheng Gui,
  • Chenxi Yu,
  • Chenxi Yu,
  • Xiaoxin Li,
  • Sen Zhao,
  • Sen Zhao,
  • Hengqiang Zhao,
  • Hengqiang Zhao,
  • Zihui Yan,
  • Zihui Yan,
  • Xi Cheng,
  • Xi Cheng,
  • Jiachen Lin,
  • Jiachen Lin,
  • Haiyang Zheng,
  • Haiyang Zheng,
  • Haiyang Zheng,
  • Jiashen Shao,
  • Jiashen Shao,
  • Zhengye Zhao,
  • Zhengye Zhao,
  • Lina Zhao,
  • Yuchen Niu,
  • Zhi Zhao,
  • Huizi Wang,
  • Bobo Xie,
  • Bobo Xie,
  • Bobo Xie,
  • Xianda Wei,
  • Xianda Wei,
  • Chunrong Gui,
  • Chunrong Gui,
  • Chuan Li,
  • Chuan Li,
  • Chuan Li,
  • Shaoke Chen,
  • Shaoke Chen,
  • Shaoke Chen,
  • Yi Wang,
  • Yanning Song,
  • Chunxiu Gong,
  • Terry Jianguo Zhang,
  • Terry Jianguo Zhang,
  • Terry Jianguo Zhang,
  • Terry Jianguo Zhang

DOI
https://doi.org/10.3389/fcell.2021.661747
Journal volume & issue
Vol. 9

Abstract

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PurposeROR2, a member of the ROR family, is essential for skeletal development as a receptor of Wnt5a. The present study aims to investigate the mutational spectrum of ROR2 in children with short stature and to identify the underlying molecular mechanisms.MethodsWe retrospectively analyzed clinical phenotype and whole-exome sequencing (WES) data of 426 patients with short stature through mutation screening of ROR2. We subsequently examined the changes in protein expression and subcellular location in ROR2 caused by the mutations. The mRNA expression of downstream signaling molecules of the Wnt5a–ROR2 pathway was also examined.ResultsWe identified 12 mutations in ROR2 in 21 patients, including 10 missense, one nonsense, and one frameshift. Among all missense variants, four recurrent missense variants [c.1675G > A(p.Gly559Ser), c.2212C > T(p.Arg738Cys), c.1930G > A(p.Asp644Asn), c.2117G > A(p.Arg706Gln)] were analyzed by experiments in vitro. The c.1675G > A mutation significantly altered the expression and the cellular localization of the ROR2 protein. The c.1675G > A mutation also caused a significantly decreased expression of c-Jun. In contrast, other missense variants did not confer any disruptive effect on the biological functions of ROR2.ConclusionWe expanded the mutational spectrum of ROR2 in patients with short stature. Functional experiments potentially revealed a novel molecular mechanism that the c.1675G > A mutation in ROR2 might affect the expression of downstream Wnt5a–ROR2 pathway gene by disturbing the subcellular localization and expression of the protein.

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