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A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family

  • Authors:
    • Huajie Huang
    • Jian Wang
    • Yingyin Liang
    • Xiaofeng Wei
    • Dan Guo
    • Hengbiao Sun
    • Xuelian Zhang
    • Xiangmin Xu
    • Fu Xiong
  • View Affiliations / Copyright

    Affiliations: Department of Medical Genetics, School of Basic Medical Sciences, Southern Medical University, Guangzhou, Guangdong 510515, P.R. China, Department of Orthopedic Surgery, Southern Medical University, Nanfang Hospital, Guangzhou, Guangdong 510515, P.R. China, Department of Neurology, First Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China, Department of Clinical Laboratory, The Third Affiliated Hospital of Southern Medical University, Guangzhou, Guangdong 510630, P.R. China
    Copyright: © Huang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 152
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    Published online on: October 6, 2020
       https://doi.org/10.3892/etm.2020.9281
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Abstract

Hypophosphatasia (HPP) is a rare hereditary systemic disease that is characterized by defective bone and/or dental mineralization, and is caused by mutations in the alkaline phosphatase gene (ALPL). The present study investigated the ALPL mutation in a Chinese Han family with HPP and studied the pathogenesis of the mutations of the ALPL gene. DNA was extracted from peripheral venous blood of the family members. Sanger sequencing was used to screen the mutations. Associations between pathogenesis for both mutations were analyzed by bioinformatics, subcellular localization, measurement of enzyme activity and western blotting. Sanger sequencing revealed the compound heterozygous mutations c.203C>T (p.T68M) and c.571G>A (p.E191K). The mutations were located at exon 4 and 6 of the ALPL gene and were predicted by Polyphen‑2 analysis to be harmful. Protein analysis indicated a decrease in mature protein production and lower enzyme activity in 293T cells transfected with plasmids carrying the mutations. The ALPL gene was cloned into the pcDNA3.1(+) vector and mutant plasmids ALPL‑pT68M and ALPL‑pE191K were constructed. Immunofluorescence observed in cells transfected with the ALPL‑pE191K mutant plasmid was mainly located in the cell membrane. However, staining in the cytoplasm was increased compared with the wild type, and almost no fluorescence was identified in 293T cells transfected with the ALPL‑pT68M mutant plasmid. The present findings demonstrated that the compound heterozygous c.571G>A and c.203C>T mutations may contribute to childhood HPP by resulting in mislocalization, decreased protein expression and loss of enzyme activity in a Han Chinese family. The results of the current study may provide insights into the potential molecular mechanism of HPP.
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Copy and paste a formatted citation
Spandidos Publications style
Huang H, Wang J, Liang Y, Wei X, Guo D, Sun H, Zhang X, Xu X and Xiong F: A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family. Exp Ther Med 20: 152, 2020.
APA
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H. ... Xiong, F. (2020). A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family. Experimental and Therapeutic Medicine, 20, 152. https://doi.org/10.3892/etm.2020.9281
MLA
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H., Zhang, X., Xu, X., Xiong, F."A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family". Experimental and Therapeutic Medicine 20.6 (2020): 152.
Chicago
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H., Zhang, X., Xu, X., Xiong, F."A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family". Experimental and Therapeutic Medicine 20, no. 6 (2020): 152. https://doi.org/10.3892/etm.2020.9281
Copy and paste a formatted citation
x
Spandidos Publications style
Huang H, Wang J, Liang Y, Wei X, Guo D, Sun H, Zhang X, Xu X and Xiong F: A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family. Exp Ther Med 20: 152, 2020.
APA
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H. ... Xiong, F. (2020). A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family. Experimental and Therapeutic Medicine, 20, 152. https://doi.org/10.3892/etm.2020.9281
MLA
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H., Zhang, X., Xu, X., Xiong, F."A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family". Experimental and Therapeutic Medicine 20.6 (2020): 152.
Chicago
Huang, H., Wang, J., Liang, Y., Wei, X., Guo, D., Sun, H., Zhang, X., Xu, X., Xiong, F."A compound heterozygous mutation of the alkaline phosphatase ALPL gene causes hypophosphatasia in a Han Chinese family". Experimental and Therapeutic Medicine 20, no. 6 (2020): 152. https://doi.org/10.3892/etm.2020.9281
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