Inositol requiring mutant 80(INO80)is a chromatin remodeler that regulates pluripotency maintenance of embryonic stem cells and reprogramming of somatic cells into pluripotent stem cells.However,the roles and mechanis...Inositol requiring mutant 80(INO80)is a chromatin remodeler that regulates pluripotency maintenance of embryonic stem cells and reprogramming of somatic cells into pluripotent stem cells.However,the roles and mechanisms of INO80 in porcine preimplantation embryonic development remain largely unknown.Here,we show that INO80 modulates trophectoderm epithelium permeability to promote porcine blastocyst development.The INO80 protein is highly expressed in the nuclei during morula-toblastocyst transition.Functional studies revealed that RNA interference(RNAi)-mediated knockdown of INO80 severely blocks blastocyst formation and disrupts lineage allocation between the inner cell mass and trophectoderm.Mechanistically,singleembryo RNA sequencing revealed that INO80 regulates multiple genes,which are important for lineage specification,tight junction assembly,and fluid accumulation.Consistent with the altered expression of key genes required for tight junction assembly,a permeability assay showed that paracellular sealing is defective in the trophectoderm epithelium of INO80 knockdown blastocysts.Importantly,aggregation of 8-cell embryos from the control and INO80 knockdown groups restores blastocyst development and lineage allocation via direct complementation of the defective trophectoderm epithelium.Taken together,these results demonstrate that INO80 promotes blastocyst development by regulating the expression of key genes required for lineage specification,tight junction assembly,and fluid accumulation.展开更多
Global warming imposes a major threat to plant growth and crop production. In some plants including Arabidopsis thaliana, elevated temperatures induce a series of morphological and developmental adjustments, termed th...Global warming imposes a major threat to plant growth and crop production. In some plants including Arabidopsis thaliana, elevated temperatures induce a series of morphological and developmental adjustments, termed thermomorphogenesis to facilitate plant cooling under high-temperature conditions. Plant thermal response is suppressed by histone variant H2A.Z. At warm temperatures, H2A.Z is evicted from nucleosomes at thermo-responsive genes, resulting in their expression changes. However, the mechanisms that regulate H2A.Z eviction and subsequent transcription changes are largely unknown. Here, we show that the INO80 chromatin remodeling complex (INO80-C) promotes thermomorphogenesis and activates the expression of thermo-responsive and auxin-related genes. INO80-C associates with PHYTOCHROME-INTERACTING FACTOR 4 (PIF4), a potent regulator in thermomorphogenesis, and mediates temperature-induced H2A.Z eviction at PIF4 targets. Moreover, INO80-C directly interacts with COMPASS-like and transcription elongation factors to promote active histone modification Histone H3 lysine 4 trimethylation (H3K4me3) and RNA Polymerase II (RNA Pol II) elongation, leading to the thermal induction of transcription. Notably, transcription elongation factors SPT4 and SPT5 are required for the H2A.Z eviction at PIF4 targets, suggesting the cooperation of INO80-C and transcription elongation in H2A.Z removal. Our results demonstrate that the (PIF4)-(INO80-C)-(COMPASS-like)-(transcription elongator) module controls plant thermal response, and establish a link between H2A.Z eviction and active transcription.展开更多
The BCCIP （BRCA2. and CDKNIA-interacting protein） is an important cofactor for BRCA2 in tumor suppression. Although the low expression of BCClP is observed in multiple clinically diagnosed primary tumor tissues such...The BCCIP （BRCA2. and CDKNIA-interacting protein） is an important cofactor for BRCA2 in tumor suppression. Although the low expression of BCClP is observed in multiple clinically diagnosed primary tumor tissues such as ovarian cancer, renal cell carcinoma and col- orectal carcinoma, the mechanism of how BCCIP is regulated in cells is still unclear. The human INO80/YY1 chromatin remodeling complex composed of 15 sub- units catalyzes ATP-dependent sliding of nucleosomes along DNA. Here, we first report that BCClP is a novel target gene of the INO80/YY1 complex by presenting a series of experimental evidence. Gene expression studies combined with siRNA knockdown data locked candidate genes including BCCIP of the INO80/YY1 complex. Silencing or over-expressing the subunits of the INO80/YY1 complex regulates the expression level of BCCIP both in mRNA and proteins in cells. Also, the functions of INO80/YY1 complex in regulating the transactivation of BCCIP were confirmed by luciferase reporter assays. Chromatin immunoprecipitation （CHIP） experiments clarify the enrichment of INO80 and YY1 at ＋0.17 kb downstream of the BCClP transcriptional start site. However, this enrichment is significantly inhibited by either knocking down INO80 or YY1, suggesting the existence of both INO80 and YY1 is required for recruiting the INO80/YY1 complex to BCClP promoter region. Our findings strongly indicate that BCClP is a potential target gene of the INO80/YY1 complex.展开更多
Chromatin remodeling complexes serve as crucial regulators of chromatin structure in eukaryotes,govern-ing the transcription,DNA repair,and genome stability.Compared with chromatin remodelers in yeast and animals,plan...Chromatin remodeling complexes serve as crucial regulators of chromatin structure in eukaryotes,govern-ing the transcription,DNA repair,and genome stability.Compared with chromatin remodelers in yeast and animals,plant chromatin remodelers exhibit both conserved and lineage-specific features,which facilitate unique adaptive responses.Cutting-edge approaches in biochemistry,epigenomics,and proteomics are revealing unprecedented insights into plant chromatin remodeling mechanisms,and genetic studies continue to demonstrate their essential roles in maintaining chromatin state homeostasis during plant growth and stress adaptation.This review synthesizes current understanding of plant chromatin remodel-ing complexes,with particular focuses on their specialized subunit compositions,mechanistic diversity,and integrative roles in epigenetic regulation.Furthermore,we highlight how these complexes interact with histone modifications,DNA methylation pathways,and transcription factor networks to orchestrate plantdevelopmentandstress responses.展开更多
Adenosine triphosphate-dependent chromatin remodeling complexes are important for the regulation of transcription,DNA replication,and genome stability in eukaryotes.Although genetic studies have illustrated various bi...Adenosine triphosphate-dependent chromatin remodeling complexes are important for the regulation of transcription,DNA replication,and genome stability in eukaryotes.Although genetic studies have illustrated various biological functions of core and accessory subunits of chromatin-remodeling complexes in plants,the identification and characterization of chromatin-remodeling complexes in plants is lagging behind that in yeast and animals.Recent studies determined whether and how the Arabidopsis SWI/SNF,ISWI,INO80,SWR1,and CHD chromatin remodelers function in multi-subunit complexes in Arabidopsis.Both conserved and plant-specific subunits of chromatin-remodeling complexes have been identified and characterized.These findings provide a basis for further studies of the molecular mechanisms by which the chromatinremodeling complexes function in plants.展开更多
基金supported by the Anhui Provincial Natural Science Foundation(1908085MC97,2008085MC85)National Natural Science Foundation of China(31802059,31902226)+1 种基金Hefei Innovation and Entrepreneurship Support Plan for Returnee Scholar(03082009)Anhui Provincial Innovation and Entrepreneurship Support Plan for Returnee Scholar(2020LCX015)。
文摘Inositol requiring mutant 80(INO80)is a chromatin remodeler that regulates pluripotency maintenance of embryonic stem cells and reprogramming of somatic cells into pluripotent stem cells.However,the roles and mechanisms of INO80 in porcine preimplantation embryonic development remain largely unknown.Here,we show that INO80 modulates trophectoderm epithelium permeability to promote porcine blastocyst development.The INO80 protein is highly expressed in the nuclei during morula-toblastocyst transition.Functional studies revealed that RNA interference(RNAi)-mediated knockdown of INO80 severely blocks blastocyst formation and disrupts lineage allocation between the inner cell mass and trophectoderm.Mechanistically,singleembryo RNA sequencing revealed that INO80 regulates multiple genes,which are important for lineage specification,tight junction assembly,and fluid accumulation.Consistent with the altered expression of key genes required for tight junction assembly,a permeability assay showed that paracellular sealing is defective in the trophectoderm epithelium of INO80 knockdown blastocysts.Importantly,aggregation of 8-cell embryos from the control and INO80 knockdown groups restores blastocyst development and lineage allocation via direct complementation of the defective trophectoderm epithelium.Taken together,these results demonstrate that INO80 promotes blastocyst development by regulating the expression of key genes required for lineage specification,tight junction assembly,and fluid accumulation.
基金This work was supported by the National Key R&D Program of China(2019YFA0903903)the Strategic Priority Research Program of the Chinese Academy of Sciences(Precision Seed Design and Breeding,XDA24020303)the National Natural Science Foundation of China(31970527).
文摘Global warming imposes a major threat to plant growth and crop production. In some plants including Arabidopsis thaliana, elevated temperatures induce a series of morphological and developmental adjustments, termed thermomorphogenesis to facilitate plant cooling under high-temperature conditions. Plant thermal response is suppressed by histone variant H2A.Z. At warm temperatures, H2A.Z is evicted from nucleosomes at thermo-responsive genes, resulting in their expression changes. However, the mechanisms that regulate H2A.Z eviction and subsequent transcription changes are largely unknown. Here, we show that the INO80 chromatin remodeling complex (INO80-C) promotes thermomorphogenesis and activates the expression of thermo-responsive and auxin-related genes. INO80-C associates with PHYTOCHROME-INTERACTING FACTOR 4 (PIF4), a potent regulator in thermomorphogenesis, and mediates temperature-induced H2A.Z eviction at PIF4 targets. Moreover, INO80-C directly interacts with COMPASS-like and transcription elongation factors to promote active histone modification Histone H3 lysine 4 trimethylation (H3K4me3) and RNA Polymerase II (RNA Pol II) elongation, leading to the thermal induction of transcription. Notably, transcription elongation factors SPT4 and SPT5 are required for the H2A.Z eviction at PIF4 targets, suggesting the cooperation of INO80-C and transcription elongation in H2A.Z removal. Our results demonstrate that the (PIF4)-(INO80-C)-(COMPASS-like)-(transcription elongator) module controls plant thermal response, and establish a link between H2A.Z eviction and active transcription.
基金This work was supported by the National Natural Science Foundation of China （Grant Nos. 31071131 and 31171245）, by the National Laboratory of Biomacromolecules （O5SY02110A and 2012kf04）, and by the Project of Jilin Province Science and Technology Development Program （20130413002GH）.
文摘The BCCIP （BRCA2. and CDKNIA-interacting protein） is an important cofactor for BRCA2 in tumor suppression. Although the low expression of BCClP is observed in multiple clinically diagnosed primary tumor tissues such as ovarian cancer, renal cell carcinoma and col- orectal carcinoma, the mechanism of how BCCIP is regulated in cells is still unclear. The human INO80/YY1 chromatin remodeling complex composed of 15 sub- units catalyzes ATP-dependent sliding of nucleosomes along DNA. Here, we first report that BCClP is a novel target gene of the INO80/YY1 complex by presenting a series of experimental evidence. Gene expression studies combined with siRNA knockdown data locked candidate genes including BCCIP of the INO80/YY1 complex. Silencing or over-expressing the subunits of the INO80/YY1 complex regulates the expression level of BCCIP both in mRNA and proteins in cells. Also, the functions of INO80/YY1 complex in regulating the transactivation of BCCIP were confirmed by luciferase reporter assays. Chromatin immunoprecipitation （CHIP） experiments clarify the enrichment of INO80 and YY1 at ＋0.17 kb downstream of the BCClP transcriptional start site. However, this enrichment is significantly inhibited by either knocking down INO80 or YY1, suggesting the existence of both INO80 and YY1 is required for recruiting the INO80/YY1 complex to BCClP promoter region. Our findings strongly indicate that BCClP is a potential target gene of the INO80/YY1 complex.
基金the National Key Research and Development Program of China(2024YFD1200800)the National Natural Science Foundation of China(32470346).
文摘Chromatin remodeling complexes serve as crucial regulators of chromatin structure in eukaryotes,govern-ing the transcription,DNA repair,and genome stability.Compared with chromatin remodelers in yeast and animals,plant chromatin remodelers exhibit both conserved and lineage-specific features,which facilitate unique adaptive responses.Cutting-edge approaches in biochemistry,epigenomics,and proteomics are revealing unprecedented insights into plant chromatin remodeling mechanisms,and genetic studies continue to demonstrate their essential roles in maintaining chromatin state homeostasis during plant growth and stress adaptation.This review synthesizes current understanding of plant chromatin remodel-ing complexes,with particular focuses on their specialized subunit compositions,mechanistic diversity,and integrative roles in epigenetic regulation.Furthermore,we highlight how these complexes interact with histone modifications,DNA methylation pathways,and transcription factor networks to orchestrate plantdevelopmentandstress responses.
基金supported by the National Natural Science Foundation of China(32025003)the National Key Research and Development Program of China(2016YFA0500801)from the Chinese Ministry of Science and Technology。
文摘Adenosine triphosphate-dependent chromatin remodeling complexes are important for the regulation of transcription,DNA replication,and genome stability in eukaryotes.Although genetic studies have illustrated various biological functions of core and accessory subunits of chromatin-remodeling complexes in plants,the identification and characterization of chromatin-remodeling complexes in plants is lagging behind that in yeast and animals.Recent studies determined whether and how the Arabidopsis SWI/SNF,ISWI,INO80,SWR1,and CHD chromatin remodelers function in multi-subunit complexes in Arabidopsis.Both conserved and plant-specific subunits of chromatin-remodeling complexes have been identified and characterized.These findings provide a basis for further studies of the molecular mechanisms by which the chromatinremodeling complexes function in plants.
