Type 2 Deiodinase A/G (Thr92Ala) Polymorphism and Circulating Thyroid Hormone Level of Childbearing Age Women in Area Replete with Iodine Deficiency Disorders
DOI:
https://doi.org/10.3889/oamjms.2022.11017Keywords:
Polymorphism, Thr92Ala, TSH, Thyroid hormone, Iodothyronine deiodinaseAbstract
BACKGROUND: Iodothyronine deiodinase (DIO) is an enzyme that regulates thyroid hormone activity. DIO consists of three types: deiodinase 1 (D1), 2 (D2), and 3 (D3). D2 is a gene that plays an important role in regulation of the biochemistry of the thyroid hormone in several tissues. D2 also plays a role in the production of triiodothyronine and controlling thyroid hormone signals. This study measured the observation that about 15% of the normal population show that D2 gene polymorphism (Thr92Ala) potentially affects the activity of D2.
AIM: This study aimed to determine D2 polymorphisms and their association with thyroid hormone levels in women of childbearing age in replete iodine deficiency disorder areas.
METHODS: Total number of subjects was 131. Analysis of serum TSH, T3, fT3, T4, and fT4 levels was done using ELISA. Polymorphism of Thr92Ala was analyzed by PCR-RFLP method.
RESULTS: The results showed that the frequencies of the genotypes Thr92Ala were AA 16.79%, AG 41.22%, and GG 41.99%, whereas the allele frequency A 37.5% and G 62.5% (p HWE = 0.171). In this study, we found no differences of TSH and thyroid hormone level between group of each allel. Mean of TSH and thyroid hormone level was on normal range.
CONCLUSION: This D2 polymorphism is associated with fT4 levels rather than fT3 but not statistically significant. Heterozygous alleles at D2 AG have higher TSH levels compared with homozygous alleles.Downloads
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