介质蛋白SYCP2通过R循环介导的DNA修复赋予了对破坏DNA的抗药性
Yumin Wang1, Boya Gao1,2, Luyuan Zhang3
1Massachusetts General Hospital Cancer Center, Harvard Medical School, 13th Street, Charlestown, MA, 02129, USA.
Nature communications
|February 21, 2024
概括
一种介质蛋白,SYCP2,在乳腺癌和卵巢癌中过度表达,通过增强DNA修复,驱动对DNA损伤反应 (DDR) 药物的耐药性. 准SYCP2可能会改善癌症治疗结果.
科学领域:
- 分子生物学分子生物学
- 癌症研究 癌症研究
- 遗传学 是一个遗传学.
背景情况:
- 在癌症治疗中,DNA损伤反应 (DDR) 药物至关重要,但药物耐药性是一个重要的临床障碍.
- 异常的蛋白质表达可以在各种癌症中驱动治疗耐药性.
研究的目的:
- 调查SYCP2的作用,一个介质性蛋白质,在癌症和其与抗药性药物DDR药物耐药性的关联.
- 阐明SYCP2影响DNA修复和药物敏感性的机制.
主要方法:
- 在乳腺和卵巢癌患者队列中分析SYCP2表达.
- 研究SYCP2在DNA双链断裂 (DSB) 修复途径中的作用,包括转录合同源复合 (TC-HR).
- 评估SYCP2对RAD51招聘和R循环形成在DSB的影响.
- 评估具有不同SYCP2水平的瘤对PARP抑制剂,拓酶I (TOP1) 抑制剂和基化疗的敏感性.
主要成果:
- 在乳腺和卵巢癌中,SYCP2异常表达,并与对DDR药物的广泛耐药性有关.
- SYCP2通过促进R循环形成和RAD51招募,独立于BRCA1.1,通过转录合同源重组 (TC-HR) 增强DSB修复.
- SYCP2的损失使瘤对PARP和TOP1抑制剂产生敏感性.
- 临床数据显示,SYCP2过度表达与乳腺癌中对TOP1抑制剂的耐药性以及卵巢癌中金治疗相关.
结论:
- 通过增强R循环介导的DSB修复,SYCP2促进了癌细胞对破坏DNA的抗药性.
- 针对SYCP2是一个潜在的策略,可以在癌症治疗中克服DDR药物耐药性.
相关概念视频
DNA Damage can Stall the Cell Cycle
9.2K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.2K
Restarting Stalled Replication Forks
5.8K
DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
5.8K
Single-Strand DNA Binding Proteins
14.1K
For successful DNA replication, the unwinding of double-stranded DNA must be accompanied by stabilization and protection of the separated single strands of the DNA. This crucial task is performed by single-strand DNA-binding (SSB) proteins. They bind to the DNA in a sequence-independent manner, which means that the nitrogenous bases of the DNA need not be present in a specific order for binding of SSB proteins to it. The binding of SSB proteins straightens single-stranded DNA (ssDNA) and makes...
14.1K
Negative Regulator Molecules
35.4K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.4K
Homologous Recombination
50.5K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
50.5K
Translesion DNA Polymerases
10.0K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
10.0K


