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Autosomal dominant Hashimoto's thyroiditis with a mutation in TNFAIP3
Tomohiro Hori1, Hidenori Ohnishi1, Tomonori Kadowaki1
1Department of Pediatrics, Graduate School of Medicine, Gifu University, Gifu, Japan.
Summary
This study links Hashimoto's thyroiditis (HT) to a genetic mutation in the TNFAIP3 gene. The findings suggest A20 haploinsufficiency may cause HT, a novel insight into this autoimmune disease.
Area of Science:
- Immunology
- Genetics
- Endocrinology
Background:
- Hashimoto's thyroiditis (HT) is an autoimmune disorder with unknown pathogenesis, potentially involving genetic and environmental factors.
- TNFAIP3 (A20) gene variants are linked to various autoimmune diseases, but not previously to HT.
- A20 haploinsufficiency has been associated with early-onset autoinflammatory conditions.
Purpose of the Study:
- To investigate the genetic basis of Hashimoto's thyroiditis in a multi-generational family.
- To explore the potential role of TNFAIP3 (A20) gene mutations in the pathogenesis of HT.
- To determine if HT can be a phenotype of A20 haploinsufficiency.
Main Methods:
- Pedigree analysis of a three-generation family with an autosomal dominant HT trait.
- Genetic analysis of the TNFAIP3 (A20) gene and human leukocyte antigen (HLA) complex.
- Identification and characterization of novel mutations within the TNFAIP3 gene.
Main Results:
- A novel heterozygous c.2209delC mutation in the TNFAIP3 (A20) gene was identified in family members with HT.
- The identified mutation segregated with HT in an autosomal dominant pattern across three generations.
- No known HLA haplotypes typically associated with HT were found in the affected individuals.
Conclusions:
- Hashimoto's thyroiditis may be a clinical manifestation of A20 haploinsufficiency.
- TNFAIP3 (A20) mutations represent a potential novel genetic cause of Hashimoto's thyroiditis.
- This study expands the known spectrum of diseases associated with TNFAIP3 (A20) haploinsufficiency.