补充C4衍生的糖是一种PMM2-CDG的生物标志物
Kishore Garapati1,2,3, Rohit Budhraja1, Mayank Saraswat1
1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota, USA.
JCI insight
|April 8, 2024
概括
一种新型的糖生物标志物,补充C4衍生Man5GlcNAc2,显示出比碳水化合物缺乏转移素 (CDT) 测试更大的灵敏度,用于诊断PMM2-先天性糖化失调 (CDG). 这一发现为PMM2-CDG和其他CDG提供了更好的诊断准确性.
科学领域:
- 生物化学和分子生物学
- 临床诊断 临床诊断 临床诊断
- 格莱科米克斯 (Glycomics) 是一个有趣的药物.
背景情况:
- 诊断PMM2-先天性糖化化障碍 (PMM2-CDG),最常见的CDG,通常依赖于碳水化合物缺乏转激素 (CDT) 和遗传检测.
- 目前的诊断方法,如CDT测试有局限性,包括假阴性和随年龄的正常化,需要更敏感的生物标志物.
- 在PMM2-CDG患者的血清中,先前没有报告过特定部位的N-糖化变化.
研究的目的:
- 用先进的质谱学发现和验证PMM2-CDG患者血清中的新型糖变异.
- 确定PMM2-CDG诊断的敏感和特定的生物标志物,潜在地克服现有方法的局限性.
- 探索PMM2-CDG和其他CDG中治疗监测所识别的生物标志物的实用性.
主要方法:
- 基于多阶段质谱的N-糖蛋白组学被用于分析72个个体 (患者和对照) 的血清.
- 进行了基于双重质量标签 (TMT) 的全面发现实验,随后进行了快速分析的方法开发.
- 针对性质谱法用于对独立样本集的盲目验证.
主要成果:
- 对3,342个N-糖的分析显示,PMM2-CDG患者的复杂型N-糖减少,截断,富含曼和杂交物种增加.
- 从补充C4 (C4) 携带Man5GlcNAc2的新型糖被确定在5名CDT结果正常的患者中,包括那些轻度疾病或移植后患者.
- 这种C4衍生的Man5GlcNAc2糖表现出比CDT更大的敏感性,并且在PMM2.2中检测到具有不确定的意义的变异的个体中.
结论:
- 补充C4衍生的Man5GlcNAc2糖是一种有前途的生物标志物,用于准确诊断PMM2-CDG.
- 与CDT测试相比,这种糖生物标志物具有更高的灵敏度,特别是在正常CDT结果或轻度疾病的情况下.
- 鉴定到的生物标志物有可能在患有PMM2-CDG和潜在的其他先天性糖化乱的患者中进行准确的诊断和治疗监测.
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