UPM Institutional Repository

Molecular diagnosis of maturity-onset diabetes of the young in a cohort of Chinese children


Xu, Aijing and Lin, Yunting and Sheng, Huiying and Cheng, Jing and Mei, Huifen and Ting, Tzer Hwu and Zeng, Chunhua and Liang, Cuili and Zhang, Wen and Li, Cuiling and Li, Xiuzhen and Liu, Li (2020) Molecular diagnosis of maturity-onset diabetes of the young in a cohort of Chinese children. Pediatric Diabetes, 21 (3). 431 - 440. ISSN 1399-543X; ESSN: 1399-5448


Objective: The purpose of this study was to investigate the molecular basis of maturity-onset diabetes of the young (MODY) by whole-exome sequencing (WES) and estimate the frequency and describe the clinical characteristics of MODY in southern China. Methods: Genetic analysis was performed in 42 patients with MODY aged 1 month to 18 years among a cohort of 759 patients with diabetes, identified with the following four clinical criteria: age of diagnosis ≤18 years; negative pancreatic autoantibodies; family history of diabetes; or persistently detectable C-peptide; or diabetes associated with extrapancreatic features. GCK gene mutations were first screened by Sanger sequencing. GCK mutation-negative patients were further analyzed by WES. Results: Mutations were identified in 24 patients: 20 mutations in GCK, 1 in HNF4A, 1 in INS, 1 in ABCC8, and a 17q12 microdeletion. Four previously unpublished novel GCK mutations: c.1108G>C in exon 9, and c.1339C>T, c.1288_1290delCTG, and c.1340_1343delGGGGinsCTGGTCT in exon 10 were detected. WES identified a novel missense mutation c.311A>G in exon 3 in the INS gene, and copy number variation analysis detected a 1.4 Mb microdeletion in the long arm of the chromosome 17q12 region. Compared with mutation-negative subjects, the mutation-positive subjects had lower hemoglobin A1c and initial blood glucose levels. Conclusions: Most MODY cases in this study were due to GCK mutations, which is in contrast to previous reports in Chinese patients. Diabetes associated with extrapancreatic features should be a clinical criterion for MODY genetic analysis. Mutational analysis by WES provided a precise diagnosis of MODY subtypes. Moreover, WES can be useful for detecting large deletions in coding regions in addition to point mutations.

Download File

[img] Text
Molecular diagnosis of maturity.pdf

Download (116kB)

Additional Metadata

Item Type: Article
Divisions: Faculty of Medicine and Health Science
DOI Number: https://doi.org/10.1111/pedi.12985
Publisher: John Wiley & Sons
Keywords: Maturity-onset diabetes of the young (MODY); Molecular diagnosis; Whole-exome sequencing (WES)
Depositing User: Mohamad Jefri Mohamed Fauzi
Date Deposited: 19 Nov 2021 09:57
Last Modified: 19 Nov 2021 09:57
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1111/pedi.12985
URI: http://psasir.upm.edu.my/id/eprint/86818
Statistic Details: View Download Statistic

Actions (login required)

View Item View Item