Abstract
Aims
Maturity-onset diabetes of the young (MODY) is an autosomal dominant monogenic form of diabetes, and glucokinase-maturity-onset diabetes of the young (GCK-MODY), or MODY 2, being the most prevalent type. However, the presence of copy number variants (CNVs) may lead to misdiagnoses, as genetic testing for MODY is typically reliant on sequencing techniques. This study aimed to describe the process of diagnosis in a Chinese pedigree with an exon 8–10 deletion of the GCK gene.
Methods
This study collected clinical data and medical history through direct interviews with the patient and reviewing relevant medical records. Sanger sequencing and whole exome sequencing (WES) were conducted over years of follow up. WES-based CNV sequencing technology was used to detect CNVs and the results were validated by multiplex ligation-dependent amplification dosage assay (MLPA). Additionally, we reviewed the previously reported cases caused by heterozygous exon deletion of the GCK gene.
Results
WES-based CNV detection revealed a heterozygous exon 8–10 deletion in the GCK gene within this particular pedigree after Sanger sequencing and WES failed to find causal variants in single nucleotide variations (SNVs) and small indels. The deletion was considered pathogenic according to ACMG/AMP and ClinGen guidelines. Most of the previously reported cases caused by heterozygous exon deletion or whole gene deletion of the GCK gene present similarly to GCK-MODY caused by SNVs and small indels.
Conclusions
This study contributed to progress in our comprehension of the mutation spectrum of the GCK gene and underscored the significance of CNV detection in the genetic testing of MODY.
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Acknowledgements
The authors would like to thank the participants in this study.
Funding
This work was supported by the grants from National Natural Science Foundation of China (No. 82170854, 81870579, 81870545, 81570715, 81170736), Beijing Natural Science Foundation (7202163), Beijing Municipal Science & Technology Commission (Z201100005520011), National High Level Hospital Clinical Research Funding (2022-PUMCH-C-019, 2022-PUMCH-B-121), National Key Research and Development Program of China (2018YFC2001100), CAMS Innovation Fund for Medical Sciences (CIFMS2021-1-I2M-002, CIFMS2017-I2M-1–008).
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RY analyzed the clinical data and wrote the manuscript. HZ contributed with gene analysis and was a major contributor to the writing of the manuscript. XX was contributed to acquisition and interpretation of the data, and revised the manuscript. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.
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The study was approved by the ethics committee of Peking Union Medical College Hospital, China. The reference number is K2985, and the date of approval is 2023–3-13.
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Guardian provided informed consent for genetic testing and analysis.
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Yu, R., Zhang, H. & Xiao, X. Partial GCK gene deletion mutations causing maturity-onset diabetes of the young. Acta Diabetol 61, 107–115 (2024). https://doi.org/10.1007/s00592-023-02173-1
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DOI: https://doi.org/10.1007/s00592-023-02173-1