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16.06.2017 | Original Article | Ausgabe 9/2017

Osteoporosis International 9/2017

A novel large fragment deletion in PLS3 causes rare X-linked early-onset osteoporosis and response to zoledronic acid

Zeitschrift:
Osteoporosis International > Ausgabe 9/2017
Autoren:
F. Lv, M. Ma, W. Liu, X. Xu, Y. Song, L. Li, Y. Jiang, O. Wang, W. Xia, X. Xing, Z. Qiu, M. Li
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1007/​s00198-017-4094-0) contains supplementary material, which is available to authorized users.
Fang Lv and Mingsheng Ma contributed equally to this work.

Abstract

Summary

We identified a novel large fragment deletion from intron 9 to 3’UTR in PLS3 (E10-E16del) in one Chinese boy with X-linked early-onset osteoporosis and vertebral fractures, which expanded the pathogenic spectrum of X-linked early-onset osteoporosis. Treatment with zoledronic acid was beneficial for increasing BMD and reshaping the vertebral bodies of this patient.

Introduction

X-linked early-onset osteoporosis is a rare disease, which is characterized by low bone mineral density (BMD), vertebral compression fractures (VCFs), and/or long bone fractures. We aimed to detect the phenotype and the underlying pathogenic mutation of X-linked early-onset osteoporosis in a boy from a nonconsanguineous Chinese family.

Methods

We investigated the pathogenic mutation of the patient with X-linked early-onset osteoporosis by targeted next-generation sequencing and confirmed it by Sanger sequencing. We also observed the effects of zoledronic acid on fracture frequency and BMD of the patient.

Results

Low BMD and multiple VCFs were the main phenotypes of X-linked early-onset osteoporosis. We identified a total of 12,229 bp deletion in PLS3, involving intron 9 to the 3’UTR (E10-E16 del). This large fragment deletion might be mediated by Alu repeats and microhomology of 26 bp at each breakpoint junction. Zoledronic acid treatment could significantly increase the Z-score of BMD and reshape the compressed vertebral bodies.

Conclusion

We identified a large fragment deletion mutation in PLS3 for the first time and elucidated the possible mechanism of the deletion, which led to X-linked early-onset osteoporosis and multiple vertebral fractures. Our findings would enrich the etiology spectrum of this rare disease.

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Zusatzmaterial
Figure S X ray films of the mother, father and sister of the proband. No wormian bones and vertebral compression fractures were observed in his mother (A-B), sister (C-D) and father (E-F). (PPT 2008 kb)
198_2017_4094_MOESM1_ESM.ppt
Table S (DOCX 18 kb)
198_2017_4094_MOESM2_ESM.docx
Literatur
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