| 1 | Pathways and assays for DNA double-strand break repair by homologous recombination显示文摘Double strand breaks(DSBs)are the most detrimental type of DNA damage that must be repaired to ensure genome integrity and cell survival.Unrepaired or improperly repaired DSBs can potentially cause tumorigenesis or cell death.DSBs are primarily repaired by non-homologous end joining or homologous recombination(HR).The HR pathway is initiated by processing of the 5′-end of DSBs to generate 3′-end single-strand DNA(ssDNA).Furthermore,the intermediate is channeled to one of the HR sub-pathways,including:(i)double Holliday junction(dHJ)pathway,(ii)synthesis-dependent strand annealing(SDSA),(iii)break-induced replication(BIR),and(iv)single-strand annealing(SSA).In the dHJ sub-pathway,the 3′-ssDNA coated with Rad51 recombinase performs homology search and strand invasion,forming a displacement loop(D-loop).Capture of the second end by the D-loop generates a dHJ intermediate that is subsequently dissolved by DNA helicase or resolved by nucleases,producing non-crossover or crossover products.In SDSA,the newly synthesized strand is displaced from the D-loop and anneals to the end on the other side of the DSBs,producing non-crossovers.In contrast,BIR repairs one-end DSBs by copying the sequence up to the end of the template chromosome,resulting in translocation or loss of heterozygosity.SSA takes place when resection reveals flanking homologous repeats that can anneal,leading to deletion of the intervening sequences.A variety of reporter assays have been developed to monitor distinct HR sub-pathways in both Saccharomyces cerevisiae and mammals.Here,we summarize the principles and representative assays for different HR sub-pathways with an emphasis on the studies in the budding yeast. | Jinbao Li Huize Sun Yulin Huang Yali Wang Yuyan Liu Xuefeng Chen | 2019 | Acta Biochimica et Biophysica Sinica2019，51，9： | 2 |
| 2 | Targeting hypoxia-induced CBS expression inhibits breast cancer stem cells through the induction of ferroptosis显示文摘Triple-negative breast cancer(TNBC)has a poor prognosis because of its aggressive characteristics and lack of targeted therapies.1 Recently,it has been reported that TNBC is sensitiveto ferroptosis,an iron-dependent type of programmed cell death,making it a potential target for the treatment of TNBC.2 Breast cancer stem cells(BCSCs),a small population of cancer cells that possess the infinite proliferative potential and tumor-initiating properties,play important roles in drug resistance.3 The responses of BCsCs to ferroptosis-inducing agents are controversial and remain elusive. | Guangyao Wei Jia Liu Jie Lan Guangyu Ji Huize Xia Zhiqun Zhao Zhaoxue Yu Rong Sun Chuanzhao Zhang Haiquan Lu | 2023 | Genes & Diseases2023，10，6： | 0 |
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