Objective:Mitotic arrest-deficient protein 1(MAD1)is a kinetochore protein essential for the mitotic spindle checkpoint.Proteomic studies have indicated that MAD1 is a component of the DNA damage response(DDR)pathway....Objective:Mitotic arrest-deficient protein 1(MAD1)is a kinetochore protein essential for the mitotic spindle checkpoint.Proteomic studies have indicated that MAD1 is a component of the DNA damage response(DDR)pathway.However,whether and how MAD1 might be directly involved in the DDR is largely unknown.Methods:We ectopically expressed the wild type,or a phosphorylation-site--mutated form of MAD1 in MAD1 knockdown cells to look for complementation effects.We used the comet assay,colony formation assay,immunofluorescence staining,and flow cytometry to assess the DDR,radiosensitivity,and the G2/M checkpoint.We employed co-immunoprecipitation followed by mass spectrometry to identify MAD1 interacting proteins.Data were analyzed using the unpaired Student'st-test.Results:We showed that MAD1 was required for an optimal DDR,as knocking down MAD1 resulted in impaired DNA repair and hypersensitivity to ionizing radiation(IR).We found that IR-induced serine 214 phosphorylation was ataxia-telangiectasia mutated(ATM)kinase-dependent.Mutation of serine 214 to alanine failed to rescue the phenotypes of MAD1 knockdown cells in response to IR.Using mass spectrometry,we identified a protein complex mediated by MAD1 serine 214 phosphorylation in response to IR.Among them,we showed that KU80 was a key protein that displayed enhanced interaction with MAD1 after DNA damage.Finally,we showed that MAD1 interaction with KU80 required serine 214 phosphorylation,and it was essential for activation of DNA protein kinases catalytic subunit(DNA-PKcs).Conclusions:MAD1 serine 214 phosphorylation mediated by ATM kinase in response to IR was required for the interaction with KU80 and activation of DNA-PKCs.展开更多
(Ataxia-telangiectasia mutated gene (ATM) functions in control of cell cycle checkpoints in responding to DNA damage and protects cells from undergoing apoptosis. Knock-out within tumor cells of endogenous ATM will ...(Ataxia-telangiectasia mutated gene (ATM) functions in control of cell cycle checkpoints in responding to DNA damage and protects cells from undergoing apoptosis. Knock-out within tumor cells of endogenous ATM will achieve therapeutic benefits and enable a better understanding of the decisive mechanisms of cell death or survival in response to DNA damaging agents. ) In present paper, we sought to characterize the cell cycle checkpoint profiles in U937-ASPI3K, a U937 cell mutant that was previously established with endogenous ATM knock-out phenotype. Syn- chronized U937-ASPI3K was exposed to 137Cs irradiation, G1, S. G2/M cell cycle checkpoint pro- files were evaluated by determining cell cycle kinetics, p53/p21 protein, cyclin dependent kinase 2 (CDK2) and p34CDC2 kinase activity in response to irradiation. U937-ASPI3K exhibited multiple defects in cell cycle checkpoints as defined by failing to arrest cells upon irradiation. The accumulation of cellular p53/p21 protein and inhibition of CDK kinase was also abolished in U937-ASPI3K. It was concluded that the stable expression of anti-sense PI3K cDNA fragment completely abolished multiple cell cycle checkpoints in U937-ASPI3K, and hence U937-ASPI3K with an AT-like phenotype could serves as a valuable model system for investigating the signal transduction pathway in responding to DNA damaging-based cancer therapy.展开更多
背景与目的:BRCA1/2、ATM基因的致病性胚系突变与前列腺癌的发病风险和疾病进展密切相关,同时可对转移性去势抵抗性前列腺癌(metastatic castration-resistant prostate cancer,m CRPC)患者的PARP抑制剂治疗、铂类化疗进行指导,然而,基...背景与目的:BRCA1/2、ATM基因的致病性胚系突变与前列腺癌的发病风险和疾病进展密切相关,同时可对转移性去势抵抗性前列腺癌(metastatic castration-resistant prostate cancer,m CRPC)患者的PARP抑制剂治疗、铂类化疗进行指导,然而,基于中国人群的研究鲜有报道。本研究旨在揭示中国人群前列腺癌患者BRCA1/2、ATM基因的胚系突变率,从而指导基因检测和临床治疗。方法:前瞻性分析53例遗传咨询门诊确诊为前列腺癌患者的临床资料,并对这些患者的胚系DNA进行测序,将目标基因BRCA1/2、ATM的突变依据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)遗传突变分类标准与指南评估致病性。同时对致病性突变与前列腺癌患者发病年龄、家族史、Gleason评分、前列腺特异抗原(prostate-specific antigen,PSA)值、肿瘤转移之间的关系进行统计学分析。结果:中国人群前列腺癌患者BRCA1/2、ATM基因的致病性胚系突变率为7.55%,转移性前列腺癌患者的突变率为9.68%。在中国人群中,BRCA1/2、ATM基因的致病性突变与前列腺癌的早期发生有关(P=0.011);但在家族史、Gleason评分、PSA水平及肿瘤转移上差异无统计学意义(P>0.05)。结论:本研究初步建立了中国人群基因检测推荐标准,对包括转移性前列腺癌患者和早发前列腺癌患者在内的高危胚系突变者推荐进行基因筛查,以更好地进行临床诊疗及遗传咨询。展开更多
BACKGROUND Ataxia-telangiectasia(AT)is a rare,autosomal recessive,multisystem disorder.Because most clinicians have low awareness of the disease,only scarce reports of AT exist in the literature,especially of cases wi...BACKGROUND Ataxia-telangiectasia(AT)is a rare,autosomal recessive,multisystem disorder.Because most clinicians have low awareness of the disease,only scarce reports of AT exist in the literature,especially of cases with lymphoma/leukemia.CASE SUMMARY A 7-year-old girl with a history of recurrent respiratory tract infections was referred to our department because of unstable walking for 5 years and enlarged neck nodes for 2-mo duration.Physical examination revealed scleral telangiectasia and cerebellar ataxia.Elevated alpha-fetoprotein,decreased serum immunoglobulin,and decreased T cell function were the major findings of laboratory examination.Histological analysis of cervical lymph node biopsy was suggestive of classical Hodgkin's lymphoma.Genetic examination showed heterozygous nucleotide variation of c.6679C>T and heterozygous nucleotide variation of c.5773 delG in the ATM gene;her parents were heterozygotes.The final diagnosis was AT with Hodgkin's lymphoma.CONCLUSION Clinicians should strengthen their understanding of AT diseases.Gene diagnosis plays an important role in its diagnosis and treatment.展开更多
Ataxia-telangiectasia mutated(ATM)plays a key role in regulating the cellular response to ionizing radiation.The tumor-suppressor gene ATM,mutations in which cause the human genetic disease ataxia telangiecta-sia,enco...Ataxia-telangiectasia mutated(ATM)plays a key role in regulating the cellular response to ionizing radiation.The tumor-suppressor gene ATM,mutations in which cause the human genetic disease ataxia telangiecta-sia,encodes a key protein kinase that controls the cellular response to double-stranded breaks.Activation of ATM results in phosphorylation of many downstream targets that modulate numerous damage response pathways,most notably cell cycle checkpoints.Here,we highlight some of the new developments in thefield in our understanding of the mechanism of activation of ATM and its signaling pathways,explore whether DNA double-strand breaks are the sole activators of ATM and ATM-dependent signaling pathways,and address some of the prominent,unanswered questions related to ATM and its function.The scope of this article is to provide a brief overview of the recent literature on this subject and to raise questions that could be addressed in future studies.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.81672743 and 81974464)Beijing Tianjin Hebei Basic Research Cooperation Project(Grant No.19JCZDJC64500(Z))+4 种基金Shenzhen Basic Research Project(Grant No.JCYJ20160331114230843)Tianjin Municipal Health Commission(Grant Nos.2015KR11 and 2013KG134)Tianjin Municipal Science and Technology Bureau(Grant No.18JCYBJC27800)US NIH grant RO 1 CAI33093,the Alabama Innovation Fund of the United Statesthe Tianjin Medical University Cancer Institute and Hospital Innovation Fund(Grant No.1803)。
文摘Objective:Mitotic arrest-deficient protein 1(MAD1)is a kinetochore protein essential for the mitotic spindle checkpoint.Proteomic studies have indicated that MAD1 is a component of the DNA damage response(DDR)pathway.However,whether and how MAD1 might be directly involved in the DDR is largely unknown.Methods:We ectopically expressed the wild type,or a phosphorylation-site--mutated form of MAD1 in MAD1 knockdown cells to look for complementation effects.We used the comet assay,colony formation assay,immunofluorescence staining,and flow cytometry to assess the DDR,radiosensitivity,and the G2/M checkpoint.We employed co-immunoprecipitation followed by mass spectrometry to identify MAD1 interacting proteins.Data were analyzed using the unpaired Student'st-test.Results:We showed that MAD1 was required for an optimal DDR,as knocking down MAD1 resulted in impaired DNA repair and hypersensitivity to ionizing radiation(IR).We found that IR-induced serine 214 phosphorylation was ataxia-telangiectasia mutated(ATM)kinase-dependent.Mutation of serine 214 to alanine failed to rescue the phenotypes of MAD1 knockdown cells in response to IR.Using mass spectrometry,we identified a protein complex mediated by MAD1 serine 214 phosphorylation in response to IR.Among them,we showed that KU80 was a key protein that displayed enhanced interaction with MAD1 after DNA damage.Finally,we showed that MAD1 interaction with KU80 required serine 214 phosphorylation,and it was essential for activation of DNA protein kinases catalytic subunit(DNA-PKcs).Conclusions:MAD1 serine 214 phosphorylation mediated by ATM kinase in response to IR was required for the interaction with KU80 and activation of DNA-PKCs.
基金This project was supported by the National Natural ScienceFoundation of China (No. 39800149)
文摘(Ataxia-telangiectasia mutated gene (ATM) functions in control of cell cycle checkpoints in responding to DNA damage and protects cells from undergoing apoptosis. Knock-out within tumor cells of endogenous ATM will achieve therapeutic benefits and enable a better understanding of the decisive mechanisms of cell death or survival in response to DNA damaging agents. ) In present paper, we sought to characterize the cell cycle checkpoint profiles in U937-ASPI3K, a U937 cell mutant that was previously established with endogenous ATM knock-out phenotype. Syn- chronized U937-ASPI3K was exposed to 137Cs irradiation, G1, S. G2/M cell cycle checkpoint pro- files were evaluated by determining cell cycle kinetics, p53/p21 protein, cyclin dependent kinase 2 (CDK2) and p34CDC2 kinase activity in response to irradiation. U937-ASPI3K exhibited multiple defects in cell cycle checkpoints as defined by failing to arrest cells upon irradiation. The accumulation of cellular p53/p21 protein and inhibition of CDK kinase was also abolished in U937-ASPI3K. It was concluded that the stable expression of anti-sense PI3K cDNA fragment completely abolished multiple cell cycle checkpoints in U937-ASPI3K, and hence U937-ASPI3K with an AT-like phenotype could serves as a valuable model system for investigating the signal transduction pathway in responding to DNA damaging-based cancer therapy.
文摘背景与目的:BRCA1/2、ATM基因的致病性胚系突变与前列腺癌的发病风险和疾病进展密切相关,同时可对转移性去势抵抗性前列腺癌(metastatic castration-resistant prostate cancer,m CRPC)患者的PARP抑制剂治疗、铂类化疗进行指导,然而,基于中国人群的研究鲜有报道。本研究旨在揭示中国人群前列腺癌患者BRCA1/2、ATM基因的胚系突变率,从而指导基因检测和临床治疗。方法:前瞻性分析53例遗传咨询门诊确诊为前列腺癌患者的临床资料,并对这些患者的胚系DNA进行测序,将目标基因BRCA1/2、ATM的突变依据美国医学遗传学与基因组学学会(American College of Medical Genetics and Genomics,ACMG)遗传突变分类标准与指南评估致病性。同时对致病性突变与前列腺癌患者发病年龄、家族史、Gleason评分、前列腺特异抗原(prostate-specific antigen,PSA)值、肿瘤转移之间的关系进行统计学分析。结果:中国人群前列腺癌患者BRCA1/2、ATM基因的致病性胚系突变率为7.55%,转移性前列腺癌患者的突变率为9.68%。在中国人群中,BRCA1/2、ATM基因的致病性突变与前列腺癌的早期发生有关(P=0.011);但在家族史、Gleason评分、PSA水平及肿瘤转移上差异无统计学意义(P>0.05)。结论:本研究初步建立了中国人群基因检测推荐标准,对包括转移性前列腺癌患者和早发前列腺癌患者在内的高危胚系突变者推荐进行基因筛查,以更好地进行临床诊疗及遗传咨询。
文摘BACKGROUND Ataxia-telangiectasia(AT)is a rare,autosomal recessive,multisystem disorder.Because most clinicians have low awareness of the disease,only scarce reports of AT exist in the literature,especially of cases with lymphoma/leukemia.CASE SUMMARY A 7-year-old girl with a history of recurrent respiratory tract infections was referred to our department because of unstable walking for 5 years and enlarged neck nodes for 2-mo duration.Physical examination revealed scleral telangiectasia and cerebellar ataxia.Elevated alpha-fetoprotein,decreased serum immunoglobulin,and decreased T cell function were the major findings of laboratory examination.Histological analysis of cervical lymph node biopsy was suggestive of classical Hodgkin's lymphoma.Genetic examination showed heterozygous nucleotide variation of c.6679C>T and heterozygous nucleotide variation of c.5773 delG in the ATM gene;her parents were heterozygotes.The final diagnosis was AT with Hodgkin's lymphoma.CONCLUSION Clinicians should strengthen their understanding of AT diseases.Gene diagnosis plays an important role in its diagnosis and treatment.
基金support of the National Natural Science Foundation of China(Grant No.20872095)was gratefully acknowledged.
文摘Ataxia-telangiectasia mutated(ATM)plays a key role in regulating the cellular response to ionizing radiation.The tumor-suppressor gene ATM,mutations in which cause the human genetic disease ataxia telangiecta-sia,encodes a key protein kinase that controls the cellular response to double-stranded breaks.Activation of ATM results in phosphorylation of many downstream targets that modulate numerous damage response pathways,most notably cell cycle checkpoints.Here,we highlight some of the new developments in thefield in our understanding of the mechanism of activation of ATM and its signaling pathways,explore whether DNA double-strand breaks are the sole activators of ATM and ATM-dependent signaling pathways,and address some of the prominent,unanswered questions related to ATM and its function.The scope of this article is to provide a brief overview of the recent literature on this subject and to raise questions that could be addressed in future studies.
