Prevalence of β-cell antibodies and associated autoimmune diseases in children and adolescents with type 1 diabetes (T1DM) versus type 2 diabetes (T2DM) in Qatar

Fawzia Alyafei, Ashraf Soliman, Fawziya Alkhalaf, Aml Sabt, Vincenzo De Sanctis, Nagwa Elsayed, Reem Waseef, Fawzia Alyafei, Ashraf Soliman, Fawziya Alkhalaf, Aml Sabt, Vincenzo De Sanctis, Nagwa Elsayed, Reem Waseef

Abstract

Introduction: Type 1 diabetes mellitus (T1DM) is an autoimmune disease with the development of abnormal immune responses to specific β-cell autoantigens in addition to other organ-specific autoimmunity. The most frequent associated disorders are thyroid dysfunctions and celiac disease. There are limited studies in the current literature on the prevalence of associated autoimmunity, especially multiple, in children and adolescents with T1DM and Type 2 diabetes mellitus (T2DM).

Objectives: The aim of the present study was to determine the prevalence of autoantibodies and thyroid dysfunctions in a cohort of children and adolescents (aged 0.5-16 years) with T1DM living in Qatar.

Research design and methods: The records of all children and adolescents attending the Pediatric Diabetes Center of Hamad Medical Center, for the past 5 years (from January 2012 to December 2016), were reviewed and all clinical and biochemical data, including β-cell autoimmunity [anti-glutamic acid decarboxylase (GAD) antibodies, anti-islet cell and anti-insulin antibodies (IAA)], thyroid function (Free thyroxine: FT4 and thyroid-stimulating hormone: TSH), anti-thyroid peroxidase antibodies (TPO) and anti-tissue transglutaminase (ATT) were collected at their first presentation (cross-sectional study). Data for patients with T1DM (n=431) and T2DM (n=59) were recorded analyzed and the prevalence calculated and compared with other studies.

Results: The prevalence of anti-GAD antibodies was 75.5 % in T1DM and 29.3% in T2DM. Anti β-islet antibodies (Ab) were detected in 53.4% of T1DM and 29.4% of T2DM. Anti-insulin Ab were detected in 40.4% of T1DM and 58.3% of T2DM. The three antibodies together were detected in 18.4 % of T1DM and none of T2DM. At presentation, hypothyroidism (FT4 <11.5 pmol/L) was detected in 10.6% of T1DM and 10% of T2DM. Subclinical hypothyroidism was diagnosed in 3.5% of T1DM and 8% of T2DM. High anti TPO was detected in 27.2% of T1DM and 34.6% of T2DM. High TPO with normal thyroid function were found in 22.7% of T1DM and 23.1% of T2DM. ATT IgA was high in 5% of T1DM and 8.7% of T2DM whereas ATT IgG was high in 4.4 % of T1DM and not detected in any patient with T2DM. Mucosal biopsy proved celiac disease in 9 out of 12 patients (75%) with positive ATT IgA and IgG antibodies.

Conclusions: Qatar has a relatively high incidence of T1DM compared to incidences reported worldwide. The incidence increased over the period 2012-2015. We report a high prevalence of associated autoimmune abnormalities in our patients with T1DM and T2DM. These data strengthen the argument for routine screening of all children and adolescents with T1DM and T2DM for other autoimmune disorders, particularly the thyroid gland.

Figures

Figure 1.
Figure 1.
Prevalence of autoantibodies in children and adolescents with T1DM and T2DM in Qatar and their family history of DM
Figure 2.
Figure 2.
Suggested clinical classification for DM types and subtypes in children and adolescents

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Source: PubMed

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