探索影响单基因衰退性疾病的基于单基因的非侵入性产前诊断的影响因素
Lingrong Kong1, Shaojun Li2, Zhenhua Zhao2
1Department of Fetal Medicine & Prenatal Diagnosis Center, Shanghai Key Laboratory of Maternal Fetal Medicine, Shanghai Institute of Maternal-Fetal Medicine and Gynecologic Oncology, Shanghai First Maternity and Infant Hospital, School of Medicine, Tongji University, Shanghai, China.
Clinical genetics
|October 12, 2023
概括
非侵入性产前诊断 (NIPD) 的准确性取决于胎儿分数,信息性SNP和重组. 优化这些因素可以提高NIPD对衰退性遗传疾病的可靠性.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 生殖医学 生殖医学
背景情况:
- 基于细胞型的非侵入性产前诊断 (NIPD) 是识别衰退性单基因疾病的宝贵工具.
- 影响NIPD表现的关键因素,包括胎儿分数,信息单核酸多态 (SNP) 计数和重组事件,需要全面调查.
- 了解这些因素对于提高临床实践中NIPD准确性和成功率至关重要.
研究的目的:
- 为了确定影响单基因病的复发性单基因疾病的基于单 haplotype 的 NIPD 的性能 (准确性和成功率) 的关键因素.
- 评估胎儿分数,信息性SNP计数和同源重组对NIPD结果的影响.
- 通过提供对优化NIPD试验设计和执行的见解来指导临床实践.
主要方法:
- 一项前性研究涉及219个受试者和有风险患八种衰退单基因疾病的家庭.
- 基于哈普洛型的NIPD使用母体循环中的相对哈普洛型剂量 (RHDO) 分析进行.
- 通过侵入性产前诊断或新生儿随访来验证NIPD结果.
主要成果:
- 在219个家庭中,NIPD测试在190个家庭中取得了成功;失败与低胎儿分数 (16),信息性SNP (9),同源重组 (4) 相关.
- 重新抽血改善了低胎儿分数病例的成功率.
- 由于信息性SNP不足而导致的失败率因基因而异 (例如,F8的14.3%,MMUT的25%);同源重组在DMD和SMN1附近更频繁,但并不总是导致失败.
- 所有201个成功的NIPD结果都与验证结果一致.
结论:
- 胎儿分数,信息性SNP计数和同源重组对于NIPD性能至关重要.
- 像重新抽血这样的策略可以减轻胎儿低分数的问题.
- 有信息性的SNP和重组的基因特异性变异需要仔细的测试设计和临床考虑.
- 开发了一种in silico方法来预测有信息的SNP计数,有助于为NIPD小组选择基因组区域.
- 当这些因素得到解决时,NIPD在产前诊断衰退性疾病方面表现出高准确度和可靠性.
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