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  • 1
    Publication Date: 2014-08-15
    Description: The balance between stem cell self-renewal and differentiation is controlled by intrinsic factors and niche signals. In the Drosophila melanogaster ovary, some intrinsic factors promote germline stem cell (GSC) self-renewal, whereas others stimulate differentiation. However, it remains poorly understood how the balance between self-renewal and differentiation is controlled. Here we use D. melanogaster ovarian GSCs to demonstrate that the differentiation factor Bam controls the functional switch of the COP9 complex from self-renewal to differentiation via protein competition. The COP9 complex is composed of eight Csn subunits, Csn1-8, and removes Nedd8 modifications from target proteins. Genetic results indicated that the COP9 complex is required intrinsically for GSC self-renewal, whereas other Csn proteins, with the exception of Csn4, were also required for GSC progeny differentiation. Bam-mediated Csn4 sequestration from the COP9 complex via protein competition inactivated the self-renewing function of COP9 and allowed other Csn proteins to promote GSC differentiation. Therefore, this study reveals a protein-competition-based mechanism for controlling the balance between stem cell self-renewal and differentiation. Because numerous self-renewal factors are ubiquitously expressed throughout the stem cell lineage in various systems, protein competition may function as an important mechanism for controlling the self-renewal-to-differentiation switch.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pan, Lei -- Wang, Su -- Lu, Tinglin -- Weng, Changjiang -- Song, Xiaoqing -- Park, Joseph K -- Sun, Jin -- Yang, Zhi-Hao -- Yu, Junjing -- Tang, Hong -- McKearin, Dennis M -- Chamovitz, Daniel A -- Ni, Jianquan -- Xie, Ting -- GM64428/GM/NIGMS NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2014 Oct 9;514(7521):233-6. doi: 10.1038/nature13562.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉1] Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA [2] Chinese Academy of Sciences Key Laboratory of Infection and Immunity, Institute of Biophysics, 15 Da Tun Road, Beijing 100101, China [3]. ; 1] Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA [2] Department of Cell Biology and Anatomy, University of Kansas School of Medicine, 3901 Rainbow Boulevard, Kansas City, Kansas 66160, USA [3]. ; 1] Center for Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China [2]. ; Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA. ; 1] Department of Molecular Biology and Graduate School of Biomedical Sciences, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9148, USA [2] Howard Hughes Medical Institute, Chevy Chase, Maryland 20815-6789, USA. ; Center for Life Sciences, School of Medicine, Tsinghua University, Beijing 100084, China. ; 1] Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA [2] Chinese Academy of Sciences Key Laboratory of Infection and Immunity, Institute of Biophysics, 15 Da Tun Road, Beijing 100101, China. ; Chinese Academy of Sciences Key Laboratory of Infection and Immunity, Institute of Biophysics, 15 Da Tun Road, Beijing 100101, China. ; Department of Plant Sciences, Tel Aviv University, Tel Aviv 69978, Israel. ; 1] Stowers Institute for Medical Research, 1000 East 50th Street, Kansas City, Missouri 64110, USA [2] Department of Cell Biology and Anatomy, University of Kansas School of Medicine, 3901 Rainbow Boulevard, Kansas City, Kansas 66160, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25119050" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Binding, Competitive ; *Cell Differentiation ; Cell Proliferation ; DNA Helicases/metabolism ; Drosophila Proteins/metabolism ; Drosophila melanogaster/*cytology/*metabolism ; Female ; Intracellular Signaling Peptides and Proteins/metabolism ; Male ; Multiprotein Complexes/*chemistry/*metabolism ; Ovary/cytology ; Peptide Hydrolases/*chemistry/*metabolism ; Protein Binding ; Stem Cells/*cytology/*metabolism ; Ubiquitins/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2012-09-21
    Description: The Pacific oyster Crassostrea gigas belongs to one of the most species-rich but genomically poorly explored phyla, the Mollusca. Here we report the sequencing and assembly of the oyster genome using short reads and a fosmid-pooling strategy, along with transcriptomes of development and stress response and the proteome of the shell. The oyster genome is highly polymorphic and rich in repetitive sequences, with some transposable elements still actively shaping variation. Transcriptome studies reveal an extensive set of genes responding to environmental stress. The expansion of genes coding for heat shock protein 70 and inhibitors of apoptosis is probably central to the oyster's adaptation to sessile life in the highly stressful intertidal zone. Our analyses also show that shell formation in molluscs is more complex than currently understood and involves extensive participation of cells and their exosomes. The oyster genome sequence fills a void in our understanding of the Lophotrochozoa.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Guofan -- Fang, Xiaodong -- Guo, Ximing -- Li, Li -- Luo, Ruibang -- Xu, Fei -- Yang, Pengcheng -- Zhang, Linlin -- Wang, Xiaotong -- Qi, Haigang -- Xiong, Zhiqiang -- Que, Huayong -- Xie, Yinlong -- Holland, Peter W H -- Paps, Jordi -- Zhu, Yabing -- Wu, Fucun -- Chen, Yuanxin -- Wang, Jiafeng -- Peng, Chunfang -- Meng, Jie -- Yang, Lan -- Liu, Jun -- Wen, Bo -- Zhang, Na -- Huang, Zhiyong -- Zhu, Qihui -- Feng, Yue -- Mount, Andrew -- Hedgecock, Dennis -- Xu, Zhe -- Liu, Yunjie -- Domazet-Loso, Tomislav -- Du, Yishuai -- Sun, Xiaoqing -- Zhang, Shoudu -- Liu, Binghang -- Cheng, Peizhou -- Jiang, Xuanting -- Li, Juan -- Fan, Dingding -- Wang, Wei -- Fu, Wenjing -- Wang, Tong -- Wang, Bo -- Zhang, Jibiao -- Peng, Zhiyu -- Li, Yingxiang -- Li, Na -- Wang, Jinpeng -- Chen, Maoshan -- He, Yan -- Tan, Fengji -- Song, Xiaorui -- Zheng, Qiumei -- Huang, Ronglian -- Yang, Hailong -- Du, Xuedi -- Chen, Li -- Yang, Mei -- Gaffney, Patrick M -- Wang, Shan -- Luo, Longhai -- She, Zhicai -- Ming, Yao -- Huang, Wen -- Zhang, Shu -- Huang, Baoyu -- Zhang, Yong -- Qu, Tao -- Ni, Peixiang -- Miao, Guoying -- Wang, Junyi -- Wang, Qiang -- Steinberg, Christian E W -- Wang, Haiyan -- Li, Ning -- Qian, Lumin -- Zhang, Guojie -- Li, Yingrui -- Yang, Huanming -- Liu, Xiao -- Wang, Jian -- Yin, Ye -- Wang, Jun -- 268513/European Research Council/International -- England -- Nature. 2012 Oct 4;490(7418):49-54. doi: 10.1038/nature11413. Epub 2012 Sep 19.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22992520" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological/*genetics ; Animal Shells/chemistry/*growth & development ; Animals ; Apoptosis Regulatory Proteins/genetics ; Crassostrea/*genetics ; DNA Transposable Elements/genetics ; Evolution, Molecular ; Female ; Gene Expression Regulation, Developmental/genetics ; Genes, Homeobox/genetics ; Genome/*genetics ; Genomics ; HSP70 Heat-Shock Proteins/genetics ; Humans ; Larva/genetics/growth & development ; Mass Spectrometry ; Molecular Sequence Annotation ; Molecular Sequence Data ; Polymorphism, Genetic/genetics ; Repetitive Sequences, Nucleic Acid/genetics ; Sequence Analysis, DNA ; Stress, Physiological/genetics/*physiology ; Transcriptome/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Location Call Number Expected Availability
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