Abstract
Purpose
This study aimed to explore the association between low-frequency and rare variants of Wnt signaling genes and postmenopausal osteoporosis (OP) by the next generation sequencing (NGS) technology.
Methods
We performed targeted NGS of nine Wnt signaling genes in 400 Chinese postmenopausal women, including 226 cases with decreased bone mineral density (BMD) and 174 controls with normal values. Proxy External Controls Association Test (ProxECAT) and logistic regression analysis were performed by data from internal cases (n = 226) and Genome Aggregation Database (gnomAD) East Asian controls (n = 9435).
Results
The genomic region of interest (ROI) of 94 functional low-frequency and rare variants was associated with OP risk (P < 0.05). The LGR6 gene was associated significantly with OP risk and BMD measurements (BMD, T-score and Z-score) (adjusted-P < 0.05) after adjusting for confounders. The allele A of rs199693693 (K82N) in LRP6 and G of novel variant 1: 202287949 (R840G) in LGR6 were associated with higher BMD, T-score, and Z-score (all adjusted-P < 0.05). ProxECAT showed that LGR4 was significantly different between the internal cases and the external controls (all adjusted-P < 0.05). Logistic regression analysis revealed that the allele G of rs765778410 (T645A) (OR = 26.16, 95% CI: 4.36–156.95, adjusted-P value = 0.026) in LGR6 and A of rs61370283 (L987M) (OR = 15.39, 95% CI: 2.98–79.55, adjusted-P value = 0.037) in LRP5 were associated with increased risk of postmenopausal OP.
Conclusion
The LGR4 and LGR6 genes and four potential functional rare variants associate with postmenopausal OP risk. These results highlight the significance of rare functional variants in postmenopausal OP genetics and provide new insights into the potential mutations in this field.

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Acknowledgements
The work was supported by the National Natural Science Foundation of China [Grant no. 81573235], the Natural Science Foundation of Hubei Province [Grant no. 2019CFB647 and 2019CFB709], and the Fundamental Research Funds for the Central Universities [Grant no. 2019kfyXKJC003].
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C.L., Q.H., R.Y., X.G., and Q.W. designed the research; C.L., Q.H., R.Y., X.G., Y.D., J.Z., Y.Z., L.T, X.L., and H.Z. conducted the research; C.L. analyzed the data; C.L., Q.H., and R.Y. wrote the draft; all authors read, reviewed, and approved the final paper; Q.W. had primary responsibility for final content.
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Li, C., Huang, Q., Yang, R. et al. Targeted next generation sequencing of nine osteoporosis-related genes in the Wnt signaling pathway among Chinese postmenopausal women. Endocrine 68, 669–678 (2020). https://doi.org/10.1007/s12020-020-02248-x
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DOI: https://doi.org/10.1007/s12020-020-02248-x