由TSH受体的细胞外域变体 (p.Leu267Phe) 引起的家族性非自身免疫甲状腺功能障碍
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Kazuhiro Shimura1, Yosuke Ichihashi2, Kiyomi Abe2,3
1Department of Pediatrics, Keio University School of Medicine, Tokyo, Japan, k_4646_0917@hotmail.com.
Hormone research in paediatrics
|February 23, 2025
概括
一种新的TSH受体 (TSHR) 变体,Leu267Phe,导致非自身免疫性甲状腺功能障碍 (NAH). 这种基因突变导致TSHR活性增加,有助于疾病的发展.
科学领域:
- 内分泌学 在内分泌学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 非自身免疫性甲状腺功能障碍 (NAH) 是一种罕见的遗传性疾病.
- 它是由TSH受体 (TSHR) 基因中的激活变体引起的.
- 大多数致病性TSHR变体都在七跨膜域 (7TMD),但有些是在细胞外域 (ECD).
研究的目的:
- 调查TSHR细胞外域 (ECD) 变异在NAH中的作用.
- 为了阐明TSHR Leu267Phe变体的结构功能关系.
主要方法:
- 直接测序在一个日本家庭中发现了TSHR变异,该家庭患有NAH.
- 创建并分析了 TSHR ECD 变体 (Leu267Phe,Ser281Asn,Asn406Ser) 和 Leu267 替代品.
- 使用冷电子显微镜评估TSHR结构功能,并通过光酶试验测量cAMP产量.
主要成果:
- 在NAH家族中确定了一种异合体TSHR Leu267Phe变体.
- 低温电磁波揭示了Leu267.7周围的ECD的结构变化.
- 267Phe-TSHR显示显著增加了对联体独立的cAMP产生 (238%的WT).
- 只有Leu267Phe和Leu267Tyr变种表现出更高的活性;蛋白质表达和局部化不受影响.
结论:
- 这种TSHR Leu267Phe变种是NAH的原因.
- 用芳香氨基酸替代Leu267可能会促进TSHR的激活.
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