斑马鱼rlbp1b-/-表达视网膜色素上皮质的生殖线干扰导致选择性暗光视觉行为缺陷,并为评估人类RLBP1变异的致病性提供查平台
John D Fehilly1,2, Tess McCann1,2, Grace Ruddin1,2
1UCD School of Biomolecular and Biomedical Science, University College Dublin, Dublin, Ireland.
概括
视网膜色素上皮质 (RPE) 中的细胞视网膜甲基结合蛋白 (CRALBP) 对于暗光视觉至关重要. 斑马鱼RPE中CRALBP的损失通过扰乱视网体代谢而损害夜视,建立了遗传视网膜疾病的模型.
科学领域:
- 眼科和视觉科学 眼科和视觉科学
- 分子和细胞生物学分子和细胞生物学
- 遗传学和基因组学 遗传学和基因组学
背景情况:
- 细胞视网膜甲结合蛋白 (CRALBP) 对于视觉循环至关重要,是视网膜蛋白的监护者.
- RLBP1基因的突变会导致以夜盲为特征的遗传性视网膜疾病.
- 斑马鱼有两个RLBP1对应物 (rlbp1a和rlbp1b),具有不同的视网膜表达模式.
研究的目的:
- 为了澄清斑马鱼视网膜中CRALBP的细胞特异性功能.
- 为研究RLBP1相关遗传视网膜疾病建立斑马鱼模型.
- 用斑马鱼补充试验评估RLBP1变异的致病性.
主要方法:
- 对单细胞RNA测序数据集的分析,以确定斑马鱼RLBP1平行表达.
- 在CRISPR-Cas9基因编辑中生成rlbp1b淘汰赛斑马鱼.
- 在不同的光照条件下测试光运动反应 (OKR).
- 视网形状分析和淘汰赛斑马鱼眼睛的无偏的蛋白质组分析.
- 使用转基因斑马鱼表达人类和斑马鱼RLBP1变体的补充试验.
主要成果:
- 主要的rlbp1a表达在Müller glia中被发现,rlbp1b在视网膜色素表皮 (RPE) 中被发现.
- 失去RPE特异性的rlbp1b有选择性地损害了暗光光动力学反应,并降低了关键的视网水平.
- 蛋白质组分析揭示了维生素A和脂质代谢的破坏,以及rlbp1b淘汰赛中的ferroptosis途径.
- 斑马鱼CRALBP,但不是人类RLBP1或突变的CRALBP,在补充试验中挽救了视力缺陷.
结论:
- RPE表达的CRALBP (Cralbpb) 对于维持视觉功能至关重要,特别是在暗光条件下.
- 斑马鱼 rlbp1b 淘汰赛模型 在人类 RLBP1 突变中观察到夜盲.
- 这项研究建立了一个有价值的斑马鱼平台,用于对RLBP1变体和遗传性视网膜疾病的体内功能评估.
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