案例报告:低形联酶4缺乏症 - 免疫失调的一个范例
Catarina Andrade1, Ana Isabel Cordeiro1, Marta Valente Pinto1,2
1Primary Immunodeficiencies Unit, Hospital D Estefânia, Unidade Local de Saúde São José, Lisbon, Portugal.
Frontiers in immunology
|March 17, 2025
概括
作为一种罕见的疾病,DNA结合酶4缺乏症可能会导致严重的综合免疫缺陷 (SCID),并带来各种症状. 这个案例突出显示了一名年轻女孩的T-B-NK+SCID呈现与自身免疫特征.
科学领域:
- 免疫学 免疫学 免疫学
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- DNA连接酶4 (LIG4) 对于通过非同类末端连接 (NHEJ) 和V(D) J重组进行DNA修复至关重要.
- LIG4 缺陷是一种罕见的自体逆向性疾病,由LIG4 基因突变引起,导致不同的临床表型.
- 严重联合免疫缺陷 (SCID) 包含一组影响适应性免疫力的遗传疾病.
研究的目的:
- 描述儿科患者的联酶4缺乏症的临床和免疫学表现.
- 突出这一罕见疾病的遗传基础和表型变异性.
- 为了强调自身免疫表型,它可以在Ligase 4缺乏症的预防后出现.
主要方法:
- 一个八岁的女性患有复发性感染和生长障碍的病例报告.
- 综合实验室检查,包括流细胞计,免疫球蛋白水平和T细胞受体库分析.
- 下一代测序 (NGS) 面板对477个与原发性免疫缺陷 (PID) 相关的基因.
主要成果:
- 这位患者出现了T-B-NK+非典型的SCID,低血球蛋白血症和T细胞反应受损.
- NGS在DNA联结酶4基因中发现了一个同卵性R278H突变.
- 患者在预防性治疗后出现了自身免疫表现,包括狼和肌炎.
结论:
- 在DNA结合酶4中的R278H突变可以导致具有显著自身免疫表型的TB-NK+非典型SCID.
- 早期诊断和管理,包括免疫球蛋白替代和预防,至关重要.
- 这一案例凸显了在Ligase 4缺乏症中遗传缺陷,免疫功能障碍和自身免疫表现之间的复杂相互作用.
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