scholarly journals Genetic Factors of Autoimmune Thyroid Diseases in Japanese

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Yoshiyuki Ban
Keyword(s):  
Genetic Susceptibility ◽  
Twin Studies ◽  
Epidemiological Data ◽  
Susceptibility Genes ◽  
Thyroid Diseases ◽  
Autoimmune Response ◽  
Autoimmune Thyroid Diseases ◽  
Autoimmune Thyroid ◽  
Genome Screening ◽  
Shared Genetic

Autoimmune thyroid diseases (AITDs), including Graves’ disease (GD) and Hashimoto’s thyroiditis (HT), are caused by immune response to self-thyroid antigens and affect approximately 2–5% of the general population. Genetic susceptibility in combination with external factors, such as smoking, viral/bacterial infection, and chemicals, is believed to initiate the autoimmune response against thyroid antigens. Abundant epidemiological data, including family and twin studies, point to a strong genetic influence on the development of AITDs. Various techniques have been employed to identify genes contributing to the etiology of AITDs, including candidate gene analysis and whole genome screening. These studies have enabled the identification of several loci (genetic regions) that are linked to AITDs, and, in some of these loci, putative AITD susceptibility genes have been identified. Some of these genes/loci are unique to GD and HT and some are common to both diseases, indicating that there is a shared genetic susceptibility to GD and HT. Known AITD-susceptibility genes are classified into three groups: HLA genes, non-HLA immune-regulatory genes (e.g., CTLA-4, PTPN22, and CD40), and thyroid-specific genes (e.g., TSHR and Tg). In this paper, we will summarize the latest findings on AITD susceptibility genes in Japanese.

scholarly journals Susceptibility Genes in Thyroid Autoimmunity

2005 ◽  
Vol 12 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Yoshiyuki Ban ◽  
Yaron Tomer
Keyword(s):  
Genetic Susceptibility ◽  
Thyroid Autoimmunity ◽  
Twin Studies ◽  
Epidemiological Data ◽  
Susceptibility Genes ◽  
Autoimmune Response ◽  
Autoimmune Thyroid Diseases ◽  
Autoimmune Thyroid ◽  
Genome Screening ◽  
Shared Genetic

The autoimmune thyroid diseases (AITD) are complex diseases which are caused by an interaction between susceptibility genes and environmental triggers. Genetic susceptibility in combination with external factors (e.g. dietary iodine) is believed to initiate the autoimmune response to thyroid antigens. Abundant epidemiological data, including family and twin studies, point to a strong genetic influence on the development of AITD. Various techniques have been employed to identify the genes contributing to the etiology of AITD, including candidate gene analysis and whole genome screening. These studies have enabled the identification of several loci (genetic regions) that are linked with AITD, and in some of these loci, putative AITD susceptibility genes have been identified. Some of these genes/loci are unique to Graves' disease (GD) and Hashimoto's thyroiditis (HT) and some are common to both the diseases, indicating that there is a shared genetic susceptibility to GD and HT. The putative GD and HT susceptibility genes include both immune modifying genes (e.g. HLA, CTLA-4) and thyroid specific genes (e.g. TSHR, Tg). Most likely, these loci interact and their interactions may influence disease phenotype and severity.

scholarly journals Searching for the Autoimmune Thyroid Disease Susceptibility Genes: From Gene Mapping to Gene Function

2003 ◽  
Vol 24 (5) ◽  
pp. 694-717 ◽  
Author(s):  
Yaron Tomer ◽  
Terry F. Davies
Keyword(s):  
Genetic Susceptibility ◽  
Cytotoxic T Lymphocyte ◽  
Twin Studies ◽  
Human Leukocyte ◽  
Epidemiological Data ◽  
Susceptibility Genes ◽  
Autoimmune Response ◽  
Autoimmune Thyroid Diseases ◽  
Autoimmune Thyroid ◽  
Genome Screening

Abstract The autoimmune thyroid diseases (AITD) are complex diseases that are caused by an interaction between susceptibility genes and environmental triggers. Genetic susceptibility, in combination with external factors (e.g., dietary iodine), is believed to initiate the autoimmune response to thyroid antigens. Abundant epidemiological data, including family and twin studies, point to a strong genetic influence on the development of AITD. Various techniques have been used to identify the genes contributing to the etiology of AITD, including candidate gene analysis and whole genome screening. These studies have enabled the identification of several loci (genetic regions) that are linked with AITD, and in some of these loci putative AITD susceptibility genes have been identified. Some of these genes/loci are unique to Graves’ disease (GD) and Hashimoto’s thyroiditis (HT), and some are common to both diseases, indicating that there is a shared genetic susceptibility to GD and HT. The putative GD and HT susceptibility genes include both immune modifying genes (e.g., human leukocyte antigen, cytotoxic T lymphocyte antigen-4) and thyroid-specific genes (e.g., TSH receptor, thyroglobulin). Most likely these loci interact, and their interactions may influence disease phenotype and severity. It is hoped that in the near future additional AITD susceptibility genes will be identified and the mechanisms by which they induce AITD will be unraveled.

Identification Of New Rare Variants Associated With Familial Autoimmune Thyroid Diseases By Deep Sequencing Of Linked Loci

2021 ◽  
Author(s):  
Cheuk Wun Li ◽  
Ravi Sachidanandam ◽  
Anitha Jayaprakash ◽  
Zhengzi Yi ◽  
Weijia Zhang ◽  
...  
Keyword(s):  
Genetic Susceptibility ◽  
Deep Sequencing ◽  
Rare Variants ◽  
Thyroid Autoimmunity ◽  
Susceptibility Genes ◽  
Thyroid Diseases ◽  
Phosphoglycerate Mutase ◽  
Inositol Polyphosphate ◽  
Autoimmune Thyroid Diseases ◽  
Autoimmune Thyroid

Abstract Context Genetic risk factors play a major role in the pathoetiology of autoimmune thyroid diseases (AITD). So far, only common risk variants have been identified in AITD susceptibility genes. Recently, rare genetic variants have emerged as important contributors to complex diseases, and we hypothesized that rare variants play a key role in the genetic susceptibility to AITD. Objective To identify new rare variants that are associated with familial AITD. Design We performed deep sequencing of 3 previously mapped AITD-linked loci (10q, 12q, and 14q) in a dataset of 34 families in which AITD clustered (familial AITD). Results We identified 13 rare variants, located in the inositol polyphosphate multikinase (IPMK) gene, that were associated with AITD (i.e. both Graves’ disease [GD] and Hashimoto’s thyroiditis [HT]); two rare variants, within the dihydrolipoamide S-succinyltransferase (DLST) and zinc-finger FYVE domain-containing protein (ZFYVE1) genes, that were associated with GD only; and 3 rare variants, within the phosphoglycerate mutase 1 pseudogene 5 (PGAM1P5), LOC105369879, and methionine aminopeptidase 2 (MetAP2) genes, that were associated with HT only. Conclusion Our study demonstrates that, in addition to common variants, rare variants also contribute to the genetic susceptibility to AITD. We identified new rare variants in 6 AITD susceptibility genes that predispose to familial AITD. Of them three genes, IPMK, ZFYVE1, and MetAP2, are mechanistically involved in immune pathways and have been previously shown to be associated with autoimmunity. These genes predispose to thyroid autoimmunity and may in the future serve as potential therapeutic targets.

scholarly journals Immunological Mechanisms of Autoimmune Thyroid Diseases: A Shift in The Traditional TH1/TH2 Paradigm

2019 ◽  
Vol 73 (2) ◽  
pp. 67-77
Author(s):  
Tatjana Zaķe ◽  
Sandra Skuja ◽  
Aivars Lejnieks ◽  
Valērija Groma ◽  
Ilze Konrāde
Keyword(s):  
Thyroid Autoimmunity ◽  
Treg Cells ◽  
Thyroid Diseases ◽  
Autoimmune Response ◽  
Autoimmune Thyroid Diseases ◽  
Autoimmune Thyroid ◽  
Th17 Lymphocytes ◽  
Immunological Mechanisms ◽  
Thyroid Autoantigens ◽  
The Impact

Abstract Autoimmune thyroid diseases (AITD) mainly include Hashimoto’s thyroiditis (HT) and Graves’ disease (GD), which are characterised by the presence of circulating antibodies against various thyroid autoantigens and infiltration of the thyroid gland by autoreactive lymphocytes. Despite the significant advancement in the knowledge of AITD pathogenesis in the last decade, the specific immunological mechanisms responsible for development of the disease are not thoroughly understood. Classically, HT has long been considered as a T helper (Th)1-mediated disease, while a Th2-driven autoimmune response is dominant for GD development. However, this classification has changed due to the description of Th17 lymphocytes, which suggested participation of these cells in AITD, particularly HT pathogenesis. Moreover, a shift in the balance between Th17 and T regulatory (Treg) cells has been observed in thyroid autoimmunity. We have observed overexpression of IL-17, the prominent effector cytokine of Th17, within thyroid tissues from HT and GD patients in our studies. The present review will focus on recent data regarding the role of Treg and Th17 lymphocytes in AITD pathogenesis. In addition, the impact and proposed mechanisms of the predominant environmental factors triggering the autoimmune response to the thyroid will be discussed.

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