HLA-A gene variation modulates residual function of the pancreatic ß-cells in children with type 1 diabetes.
Pediatr Endocrinol Diabetes Metab
; 26(2): 73-78, 2020.
Article
in En
| MEDLINE
| ID: mdl-32462851
ABSTRACT
AIM OF THE STUDY The study aimed to analyze an association between the HLA-A gene variation and a risk of type 1 diabetes development and to evaluate the association of HLA class I and class II alleles with ß-cell destruction. MATERIAL AND METHODS:
A group of 108 children with type 1 diabetes were genotyped in HLA-A, -DRB1, and -DQB1 genes using hybridization with oligonu-cleotides probes. Plasma C-peptide concentration was assessed by radioimmunoassay method.RESULTS:
No differences in allele HLA-A distribution between type 1 diabetes patients and healthy individuals were found. Among "low C-peptide"(< 0.28 pmol/ml) individuals, the frequency of HLA-A*02 allele was 41.3%, whereas only one HLA-A*26 allele was detected in this group (0.7%). Conversely, among "high C-peptide"(ï³ 0.28 pmol/ml) probands the prevalence of A*02 allele was 19.7% (Pc = 0.008, OR = 1.4, 95% CI 1.2-1.7) and A*26 10.5 % (Pc < 0.007, OR = 0.15, 95% CI 0.02-0.9). Genotype analysis showed that A*02/*02 and A*02/X children were more likely to have "low" C-peptide at the onset compared to those with non-A*02/non-A*02 genotype (p = 0.008, OR = 1.6, 95% CI 1.3-2.0 and p = 0.015, OR = 1.4, 95% CI 1.1-1.9, respectively). A02 phenotype individuals had lower median C-peptide (0.17 pmol/ml) than non-A02 patients (0.26 pmol/ml, p = 0.008). Median C-peptide was higher in the A26-positive group comparing to A26-negative (0.40 and 0.20, respectively, p = 0.04). No association between HLA class II and C-peptide levels was observed.CONCLUSIONS:
HLA-A alleles are not associated with disease development nevertheless strongly influence a residual pancreatic ß-cell function. The results suggest a different role of HLA class I and class II in type 1 diabetes pathogenesis.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Genetic Variation
/
HLA-A Antigens
/
Genetic Predisposition to Disease
/
Diabetes Mellitus, Type 1
/
Insulin-Secreting Cells
Type of study:
Etiology_studies
/
Risk_factors_studies
Limits:
Adolescent
/
Child
/
Child, preschool
/
Female
/
Humans
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Infant
/
Male
Country/Region as subject:
Europa
Language:
En
Journal:
Pediatr Endocrinol Diabetes Metab
Journal subject:
ENDOCRINOLOGIA
/
METABOLISMO
/
PEDIATRIA
Year:
2020
Document type:
Article
Affiliation country: