Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes
INTRODUCTION: Type 1 diabetes autoantibodies are directed against multiple antigens including: glutamic acid decarboxylase, protein tyrosine phosphatase-like islet antigen 2 (IA2), insulin (IAA), and Zinc transporter 8 protein (ZnT8). The aim of our study was to determine if the presence or titer of...
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| Format: | Article |
| Language: | English |
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Galenos Yayincilik
2023-03-01
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| Series: | JCRPE |
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| Online Access: | https://jcrpe.org/jvi.aspx?un=JCRPE-84856&volume=15&issue=1 |
| _version_ | 1811161501501751296 |
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| author | Amanda Dahl Sarah Jenkins M. Siobhan J. Pittock Siobhan T. Pittock |
| author_facet | Amanda Dahl Sarah Jenkins M. Siobhan J. Pittock Siobhan T. Pittock |
| author_sort | Amanda Dahl |
| collection | DOAJ |
| description | INTRODUCTION: Type 1 diabetes autoantibodies are directed against multiple antigens including: glutamic acid decarboxylase, protein tyrosine phosphatase-like islet antigen 2 (IA2), insulin (IAA), and Zinc transporter 8 protein (ZnT8). The aim of our study was to determine if the presence or titer of ZnT8 antibodies (Ab) was predictive for clinical presentation at diagnosis or for the subsequent disease course.
METHODS: Between January, 2003 and May, 2019, 105 patients aged ≤21 years with a clinical diagnosis of type 1 diabetes mellitus had at least 1 autoantibody measured. A retrospective chart review was completed. At diagnosis, we evaluated the body mass index z-score, hemoglobin (HbA1c), and the presence of diabetic ketoacidosis (DKA). Complications analyzed post-diagnosis included episodes of DKA, the diagnosis of autoimmune disease, and the presence of vascular complications. We evaluated cumulative lifetime excess glucose as HbA1c area under the curve (AUC) >6%.
RESULTS: Seventy-one patients were ZnT8-Ab(+) (68%), with 19 having low titer ZnT8-Ab and 52 with high titer ZnT8-Ab. Follow-up ranged from 10 days to 15.7 years (median 2.08 years). There were no differences in the characteristics at disease onset or in the subsequent follow-up between those with and those without ZnT8-Ab or those with high or low titers of ZnT8 Ab, except for a small but statistically significant difference in cumulative excess glucose (HbA1c AUC >6%) between those with low and high titers (p=0.0095).
DISCUSSION AND CONCLUSION: Our study adds to the limited literature on the effect of the presence and titer of ZnT8-Ab in pediatric diabetes. The small effect of ZnT8-Ab titer on glucose excess as measured by HbA1c AUC warrants further study. |
| first_indexed | 2024-04-10T06:15:20Z |
| format | Article |
| id | doaj.art-91643e59084445ad8eedc99cef63ba2b |
| institution | Directory Open Access Journal |
| issn | 1308-5727 1308-5735 |
| language | English |
| last_indexed | 2024-04-10T06:15:20Z |
| publishDate | 2023-03-01 |
| publisher | Galenos Yayincilik |
| record_format | Article |
| series | JCRPE |
| spelling | doaj.art-91643e59084445ad8eedc99cef63ba2b2023-03-02T08:39:36ZengGalenos YayincilikJCRPE1308-57271308-57352023-03-01151354110.4274/jcrpe.galenos.2022.2022-4-16Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 DiabetesAmanda Dahl0https://orcid.org/0000-0002-4465-9937Sarah Jenkins M.1https://orcid.org/0000-0002-4157-8066Siobhan J. Pittock2https://orcid.org/0000-0002-2616-7349Siobhan T. Pittock3https://orcid.org/0000-0002-2616-7349Mayo Clinic, Department of Pediatric Endocrinology, Minnesota, USAMayo Clinic, Health Sciences Research, Minnesota, USAMayo Clinic, Department of Neurology, Minnesota, USAMayo Clinic, Department of Pediatric Endocrinology, Minnesota, USAINTRODUCTION: Type 1 diabetes autoantibodies are directed against multiple antigens including: glutamic acid decarboxylase, protein tyrosine phosphatase-like islet antigen 2 (IA2), insulin (IAA), and Zinc transporter 8 protein (ZnT8). The aim of our study was to determine if the presence or titer of ZnT8 antibodies (Ab) was predictive for clinical presentation at diagnosis or for the subsequent disease course. METHODS: Between January, 2003 and May, 2019, 105 patients aged ≤21 years with a clinical diagnosis of type 1 diabetes mellitus had at least 1 autoantibody measured. A retrospective chart review was completed. At diagnosis, we evaluated the body mass index z-score, hemoglobin (HbA1c), and the presence of diabetic ketoacidosis (DKA). Complications analyzed post-diagnosis included episodes of DKA, the diagnosis of autoimmune disease, and the presence of vascular complications. We evaluated cumulative lifetime excess glucose as HbA1c area under the curve (AUC) >6%. RESULTS: Seventy-one patients were ZnT8-Ab(+) (68%), with 19 having low titer ZnT8-Ab and 52 with high titer ZnT8-Ab. Follow-up ranged from 10 days to 15.7 years (median 2.08 years). There were no differences in the characteristics at disease onset or in the subsequent follow-up between those with and those without ZnT8-Ab or those with high or low titers of ZnT8 Ab, except for a small but statistically significant difference in cumulative excess glucose (HbA1c AUC >6%) between those with low and high titers (p=0.0095). DISCUSSION AND CONCLUSION: Our study adds to the limited literature on the effect of the presence and titer of ZnT8-Ab in pediatric diabetes. The small effect of ZnT8-Ab titer on glucose excess as measured by HbA1c AUC warrants further study.https://jcrpe.org/jvi.aspx?un=JCRPE-84856&volume=15&issue=1type 1 diabetes mellitusautoantibodiesgad65ia2iaaznt8 |
| spellingShingle | Amanda Dahl Sarah Jenkins M. Siobhan J. Pittock Siobhan T. Pittock Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes JCRPE type 1 diabetes mellitus autoantibodies gad65 ia2 iaa znt8 |
| title | Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes |
| title_full | Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes |
| title_fullStr | Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes |
| title_full_unstemmed | Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes |
| title_short | Clinical Utility and Outcome Prediction of Early ZnT8-IgG Testing and Titer in Type 1 Diabetes |
| title_sort | clinical utility and outcome prediction of early znt8 igg testing and titer in type 1 diabetes |
| topic | type 1 diabetes mellitus autoantibodies gad65 ia2 iaa znt8 |
| url | https://jcrpe.org/jvi.aspx?un=JCRPE-84856&volume=15&issue=1 |
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