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DOI: 10.1055/a-2388-3190
A De novo Mutation in the COL1A1 Gene Leading to Severe Osteogenesis Imperfecta: Case Report and Review of the Literature
Funding This study was supported by projects funded by the National Key Research and Development Program of China (2018YFC1002900, 2018YFC1002903, and 2021YFC2701504).Abstract
Introduction Osteogenesis imperfecta (OI) is the most common monogenic inherited skeletal dysplasia disorder. Mutations in the COL1A1/COL1A2 gene cause ∼85 to 90% of OI. Studies of cases have demonstrated that missense mutations are the primary cause of OI, with poor prognosis.
Case Description We report the case of a fetus with skeletal abnormalities and subcutaneous edema. Ultrasound imaging revealed suspected skeletal malformations, including hypoplastic long bones of all four limbs, poorly ossified calvarium, unrevealing nasal bones, and generalized subcutaneous edema. Whole-exome sequencing revealed a heterozygous mutation in COL1A1 (c.2174G > T/p.(G725V), NM_000088.3). According to the American College of Medical Genetics and Genomics guidelines, it was determined to be a pathogenic variant and identified as a de novo variant (PS2 + PP3_strong + PM2_supporting), which has not been reported in the HGMD, gnomAD, ClinVar, or other databases. This variation causes a glycine-to-valine substitution at position 725, located within the Gly-Xaa-Yaa repeat in the helical domain of the collagen molecule.
Conclusion The COL1A1 mutation (c.2174G > T/p.(G725V), NM_000088.3) is a novel pathogenic variant of severe OI. Our study expanded the OI COL1A1 gene variation profiles in the Chinese population and provided a theoretical foundation for prenatal diagnosis, genetic counseling, and obstetric management.
Ethics Approval
The samples used in this study were collected with appropriate informed consent and approval from the Ethics Committee of Shandong Provincial Hospital, affiliated with Shandong First Medical University (LCYJ: NO. 2018-003).
Authors' Contribution
Y.L. and Y.T. wrote the original draft of this manuscript. J.L. and Y.W. visualized the study. X.W. contributed to the conceptualization; methodology; project administration, writing, review, and editing.
Patient Consent
Images and information from individual participants were obtained from the individual's free prior informed consent.
Data Availability
All the data involved in this study are available in the manuscript, tables, and figures.
Publication History
Received: 13 June 2024
Accepted: 04 August 2024
Accepted Manuscript online:
14 August 2024
Article published online:
12 September 2024
© 2024. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
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