Genetics of C-Peptide and Age at Diagnosis in Type 1 Diabetes.

Roshandel, Delnaz; Spiliopoulou, Athina; McGurnaghan, Stuart J; Iakovliev, Andrii; Lipschutz, Debby; Hayward, Caroline; Bull, Shelley B; Klein, Barbara E K et al. · Diabetes · 2025

basic_science · Level V

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Abstract

Identified genetic loci for C-peptide and type 1 diabetes (T1D) age at diagnosis (AAD) explain only a small proportion of their variation. We aimed to identify additional genetic loci associated with C-peptide and AAD. Some HLA allele/haplotypes associated with T1D also contributed to variability of C-peptide and AAD, whereas outside the HLA region, T1D loci were mostly not associated with C-peptide or AAD. Genetic variation within CTSH can affect AAD. There is still residual heritability of C-peptide and AAD outside of HLA that could benefit from larger meta-genome-wide association studies.

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