在亨廷顿病中,PMS1作为拼接调节的目标,以防止体质CAG重复扩张
Zachariah L McLean1,2,3, Dadi Gao1,2,3, Kevin Correia1
1Molecular Neurogenetics Unit, Center for Genomic Medicine, Massachusetts General Hospital, Boston, MA 02114, USA.
bioRxiv : the preprint server for biology
|August 7, 2023
概括
小分子拼接调节器减少亨廷顿病 (HD) CAG重复扩张. 使用这些调节器准DNA修复基因PMS1提供了一种新的策略,可以潜在地延迟HD的发病和进展.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
背景情况:
- 亨廷顿病 (HD) 是一种神经退行性疾病,由HTT基因中的扩大CAG重复引起,导致运动,认知和行为缺陷.
- 身体CAG重复扩张显著影响着HD发病的年龄,DNA修复基因被确定为关键修饰因子.
- 针对HTT的小分子拼接调节器正在研究降低亨廷丁水平并减轻HD中神经元损伤.
研究的目的:
- 为了研究小分子拼接调节器对亨廷顿病CAG重复不稳定的影响.
- 通过探索拼接调节器的机制,确定延迟HD发病的新型治疗策略.
- 为了确定拼接调节器是否影响已知影响HD发病年龄的DNA修复基因.
主要方法:
- 利用一种新的hTERT-immortalized视网膜色素上皮细胞 (RPE1) 模型来评估HTT CAG的重复不稳定性.
- 施用了拼接调节剂 (例如branaplam),并分析了它们对CAG重复扩张率的影响.
- 采用CRISPR-Cas9基因组编辑来确认特定基因序列 (HTT和PMS1) 在拼接调节器介导的CAG扩张抑制中的作用.
主要成果:
- 发现,包括branaplam在内的拼接调节剂可以降低RPE1细胞模型中HTT CAG重复扩张的速率.
- 这些药物被观察到会影响不匹配修复基因PMS1的表达,这是已知的HD年龄发作的修饰剂.
- 基因组编辑证实,branaplam通过诱导PMS1中的伪外显子纳入来抑制CAG扩张,这意味着PMS1的拼接调制作为治疗途径.
结论:
- 拼接调节PMS1是一种延迟亨廷顿病发作的潜在策略.
- 拼接调节器的有效性可能受到遗传变异的影响,突出显示了它们治疗应用的复杂性.
- 对其他受拼接调节器影响的基因的进一步调查可能会揭示用于管理HD中CAG不稳定的额外的治疗标.
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