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Published on: July 5, 2022
VARIATIONS IN MONOGENIC DIABETES AND DIABETES SUSCEPTIBILITY GENES IN PEDIATRIC CASES: SINGLE CENTER EXPERIENCE
I Arslanoğlu1, R Eröz2, F Yavuzyılmaz1
1Duzce University Medical School - Department of Pediatric Endocrinology, Duzce.
Insights
Genetic testing in children with diabetes identified 110 variants in 89 patients, revealing 30 novel mutations. This highlights the importance of genetic analysis for understanding pediatric diabetes subtypes.
Area of Science:
- Pediatric Endocrinology
- Medical Genetics
- Diabetes Research
Background:
- Diabetes mellitus is a complex chronic condition with diverse etiologies, including genetic factors.
- Understanding the genetic basis of pediatric diabetes is crucial for accurate diagnosis and management.
- Large cohorts are essential for identifying genetic variants and their clinical significance.
Observation:
- This study retrospectively analyzed genetic and clinical data from a large pediatric diabetes cohort.
- Genetic testing was performed on 246 children diagnosed with diabetes before age 18.
- Of those tested, 110 diabetes-related variants were identified in 89 children, including 30 novel mutations.
Findings:
- The most frequently affected genes were GCK (26.6%) and ABCC8 (10%).
- Pathogenic or likely pathogenic variants were found in 49 cases, and 11 variants of unknown significance were identified.
- Antibody testing was negative in 80% of cases, suggesting a genetic origin.
Implications:
- Genetic interpretation in selected pediatric diabetes cases enhances disease understanding.
- Increased genetic testing accessibility and awareness may reveal a higher prevalence of genetically explained diabetes.
- Recognizing genetic subtypes is vital, as their distribution varies geographically.
Context:
Diabetes is a chronic disorder with a complex pathogenetic background including monogenic, polygenic, and environmental causes.
Objective:
The aim of the present paper is to share the information related to genetic and clinical data of large pediatric diabetes cohort.
Design:
The present study retrospectively analyzes genetic and clinical findings of subjects diagnosed with diabetes under the age of 18 year and are in follow-up in a pediatric diabetes referral center.
Subjects And Methods:
Out of 1205 children with diabetes (902 treated with insulin) 246 underwent genetic tests on the basis of clinical selection criteria since 2007.
Results:
One hundred and ten variants related to diabetes were found in 89 of them. Age at presentation was 9.5±4.02 years (F/M 44/45). In total 49 pathogenic and likely pathogenic, 11 "hot and warm" of unknown significance variants were found in fourteen MODY and fifteen non-MODY genes according to criteria developed by American College of Medical Genetics. Thirty novel mutations were found. GCK (26.6%) and ABCC8 (10%) were two most frequently affected genes. Antibody testing revealed negative results in 80% of cases.
Conclusions:
Genetic interpretation in selected cases is important to understand the nature of the disease better. Improvement in testing opportunity and awareness might increase the prevalence of genetically explained diabetes cases. The distribution of subtypes differs between countries and even regions of the same country.
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