与FRAXE相关的智力障碍:对一个诊断不足的疾病的临床和分子见解
Isabel Serra Nunes1,2,3, Maria Abreu4, Jorge Diogo Da Silva4,5,6,7,8,9
1Department of Medical Genetics, Centro de Genética Médica Dr. Jacinto Magalhães, Centro Hospitalar Universitário de Santo António, Unidade Local de Saúde de Santo António, Porto, Portugal. isabelserranunes@gmail.com.
由AFF2基因突变引起的FRAXE相关智力发育障碍 (FRAXE-ID) 由于症状变化而被诊断不足. 早期的分子检测对于准确的诊断和受影响的男性的遗传咨询至关重要.
科学领域:
- 遗传学 遗传学 是一个
- 神经发育障碍 神经发育障碍
- 分子生物学分子生物学
背景情况:
- 与FRAXE相关的智力发育障碍 (FRAXE-ID) 是一种罕见的X关联疾病,由AFF2基因破坏引起.
- 它的特征是CCG重复扩张和高甲基化,导致智力障碍.
- 由于其可变和非特异性的临床表现,FRAXE-ID经常被诊断不足.
研究的目的:
- 报告三个被诊断患有FRAXE-ID的年轻男性患者的临床和分子发现.
- 突出分子测试对于准确诊断这种未被认可的疾病的重要性.
- 强调孕产妇在遗传模式中的预突变载体母亲的作用.
主要方法:
- 对三名疑似FRAXE-ID的男性患者进行临床评估.
- 分子测试,包括对AFF2基因突变的评估 (完全突变和马赛克).
- 南方斑点分析以确认扩展的AFF2等位基因的高甲基化.
主要成果:
- 这三名患者都呈现出全球发育迟缓,轻度至中度智力障碍和微妙的异形特征.
- 分子测试在所有病例中都证实了全 AFF2 基因突变; 一名患者显示出尺寸马赛克主义.
- 南方斑点分析证实了扩展基因的高甲基化,母亲被确定为前变异载体.
结论:
- FRAXE-ID是一种非综合征性并且经常被忽视的疾病.
- 准确的诊断需要针对AFF2基因的特定分子技术.
- 提高临床意识和有针对性的测试对于及时诊断,管理和遗传咨询至关重要.
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