激活剂和抑制剂与Xeroderma pigmentosum中TFIH的缺陷相互作用
J Liu1, S Akoulitchev, A Weber
1Gene Regulation Section, Laboratory of Pathology, National Cancer Institute, National Institute of Health, Bethesda, MD 20892, USA.
Cell
|March 10, 2001
概括
在TFIIH子单元中发生的突变,Xeroderma pigmentosum (XP) B和XPD破坏了c-myc基因的转录调节. 这种微妙的转录缺陷,不仅仅是DNA修复问题,导致XP患者的癌症风险.
科学领域:
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
- 癌症研究 癌症研究
背景情况:
- 在TFIIH螺旋酶亚单元XPB和XPD的遗传突变导致重叠的DNA修复和转录综合征.
- 色素瘤 (XP) 患者的高癌症风险不完全由单独的DNA修复缺陷来解释.
- 在XP中转录缺陷是微妙的,难以评估.
研究的目的:
- 研究XPB和XPD突变对FUSE结合蛋白 (FBP) 和FBP相互作用抑制剂 (FIR) 的转录调节的影响.
- 阐明TFIIH在FBP介导的转录激活和FIR介导的抑制中的作用.
- 了解TFIIH功能受损对c-myc表达和恶性瘤发展的影响.
主要方法:
- 研究了TFIIH子单位 (XPB,XPD) 与转录监管机构FBP和FIR之间的相互作用.
- 评估了XPB和XPD突变对FBP依赖的转录激活和FIR依赖的抑制的影响.
- 在TFIIH突变的背景下分析了c-myc基因表达的调节.
主要成果:
- 发现XPB和XPD突变阻断了FBP的转录激活.
- 突变还影响了FIR介导的转录抑制.
- TFIIH促进了FBP介导的转录,直到发起者逃脱和FIR介导的延迟启动后.
- FBP和FIR受损的TFIIH监管影响了c-myc表达.
结论:
- 影响FBP和FIR调节的TFIIH突变破坏了适当的c-myc表达控制.
- 这些转录失调有助于XP患者观察到的高恶性瘤风险.
- 了解这些转录缺陷对于评估XP综合征和癌症发展至关重要.
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