一个T细胞急性淋巴细胞白血病病例用于ADA-SCID的逆转录病毒基因疗法
Daniela Cesana1, Maria Pia Cicalese1,2,3, Andrea Calabria1
1San Raffaele Telethon Institute for Gene Therapy (SR-Tiget), IRCCS San Raffaele Scientific Institute, Milan, Italy.
Nature communications
|April 30, 2024
概括
使用γ-逆转录病毒载体治疗腺胺酶缺乏症的基因治疗可以导致T细胞急性淋巴细胞白血病 (T-ALL). 一名患者在治疗几年后发展出T-ALL,与向量插入相关,激活了LMO2原型瘤基因.
科学领域:
- * 血液学 血液学
- * 瘤学 在线咨询
- * 基因疗法 基因疗法
背景情况:
- *用γ-逆转录病毒载体 (γ-RV) 进行的造血干细胞基因疗法 (GT) 有效治疗缺少腺氨酶 (ADA) 的严重联合免疫缺陷症 (SCID).
- * 长期安全问题包括可能导致瘤发生的插入性突变发生.
研究的目的:
- * 报告T细胞急性淋巴细胞白血病 (T-ALL) 病例发生在GT后4.7年,用于ADA-SCID.
- * 为了研究这位患者T-ALL发展的基础分子机制.
主要方法:
- *详细的临床病例审查.
- * 布拉斯特细胞的分子分析,包括载体插入部位映射,LMO2原基因激活,ADA活性评估和体质/胚芽细胞突变概况.
主要成果:
- * 一个单个γ-RV插入激活LMO2原瘤基因被确定在爆细胞中.
- * 在T-ALL诊断前几年,载体插入存在于多个血统中,这表明随后发生的瘤性事件.
- * 低ADA活性归因于病毒促进物甲基化.
- *爆细胞携带既已知的和新的体质突变,以及生殖系突变,可能有助于白血病发生.
结论:
- * 这一案例突出了GT对ADA-SCID的罕见但严重的不良事件.
- *这些发现表明,一个多步骤的过程涉及向量插入和额外的遗传命中在胸膜前代.
- *转基因,疾病背景和患者因素的差异可能解释了与其他 γ-RV GT 试验相比,ADA 缺乏症中与载体相关的不良事件的发病率较低.
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