在患有类风湿性关节炎的患者中,DNA双链断裂的低效修复和HRR和NHEJ修复基因的常见多态性之间的关联
Grzegorz Galita1, Joanna Sarnik2, Olga Brzezinska2
1Department of Clinical Chemistry and Biochemistry, Medical University of Lodz, 92-215 Lodz, Poland.
International journal of molecular sciences
|March 13, 2024
概括
类风湿性关节炎患者显示DNA双链断裂 (DSB) 修复效率受损. RAD50和RAD51B基因的遗传变异,以及基因表达的增加,与类风湿性关节炎中这种DNA修复缺陷有关.
科学领域:
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
- 免疫学 免疫学 免疫学
背景情况:
- 风湿性关节炎 (RA) 是一种全球性自身免疫性疾病,影响高达2.0%的成年人,其特点是慢性炎症.
- 遗传因素是RA的重要风险因素,但其分子基础仍然不完全理解.
- 缺陷的DNA修复,特别是DNA双链断裂 (DSB) 修复,是RA患者外周血液单核细胞 (PBMCs) 的公认标志.
研究的目的:
- 调查DNA DSB修复效率与RA患者的DSB修复基因中的特定遗传变异 (单核酸多态 - SNPs) 之间的相关性.
- 分析关键的DSB修复基因的表达水平,与健康对照相比,在RA患者.
- 确定RA中受损的DSB修复是否与特定的基因型和基因表达模式有关.
主要方法:
- 使用彗星试验在试验室中评估了45名RA患者和45名健康对照患者在白素暴露后的PBMC中的DSB修复效率.
- TaqMan SNP 基因造型试验被用来识别和分析SNP在DSB修复基因中的分布.
- 进行了TaqMan基因表达试验,以量化相关DSB修复基因的RNA表达水平.
主要成果:
- 与对照组相比,来自RA患者的PBMC在修复白素诱导的DNA病变方面表现出明显较低的效率 (84.5%vs24.4%).
- 在RAD50 (rs1801321,rs1801320) 和RAD51B (rs963917,rs3784099) 基因中的特定SNP与RA中无效DNA修复的几率增加有关.
- 在RA患者的PBMC中观察到RAD51B,BRCA1和BRCA2基因的高表达,进一步得到决策树分析的支持 (精度为0.84).
结论:
- 类风湿性关节炎中DSB修复受损与关键修复基因的遗传变异和基因表达水平的改变显著相关.
- 这些发现表明,DSB修复基因的遗传多态化和表达模式在RA的发病过程中可能发挥作用.
- 需要进一步的研究,以阐明DSB修复,遗传因素和RA发展之间的关系背后的精确机制.
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