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排序方式: 共有84条查询结果,搜索用时 31 毫秒
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Cheung VG Nowak N Jang W Kirsch IR Zhao S Chen XN Furey TS Kim UJ Kuo WL Olivier M Conroy J Kasprzyk A Massa H Yonescu R Sait S Thoreen C Snijders A Lemyre E Bailey JA Bruzel A Burrill WD Clegg SM Collins S Dhami P Friedman C Han CS Herrick S Lee J Ligon AH Lowry S Morley M Narasimhan S Osoegawa K Peng Z Plajzer-Frick I Quade BJ Scott D Sirotkin K Thorpe AA Gray JW Hudson J Pinkel D Ried T Rowen L Shen-Ong GL Strausberg RL Birney E Callen DF Cheng JF Cox DR Doggett NA Carter NP Eichler EE 《Nature》2001,409(6822):953-958
We have placed 7,600 cytogenetically defined landmarks on the draft sequence of the human genome to help with the characterization of genes altered by gross chromosomal aberrations that cause human disease. The landmarks are large-insert clones mapped to chromosome bands by fluorescence in situ hybridization. Each clone contains a sequence tag that is positioned on the genomic sequence. This genome-wide set of sequence-anchored clones allows structural and functional analyses of the genome. This resource represents the first comprehensive integration of cytogenetic, radiation hybrid, linkage and sequence maps of the human genome; provides an independent validation of the sequence map and framework for contig order and orientation; surveys the genome for large-scale duplications, which are likely to require special attention during sequence assembly; and allows a stringent assessment of sequence differences between the dark and light bands of chromosomes. It also provides insight into large-scale chromatin structure and the evolution of chromosomes and gene families and will accelerate our understanding of the molecular bases of human disease and cancer. 相似文献
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High mutation rates have driven RNA viruses to shorten their genomes to the minimum possible size. Mammalian (+)-strand RNA viruses and retroviruses have responded by reducing the number of cis-acting regulatory elements, a constraint that has led to the emergence of the polyprotein. Poliovirus is a (+)-stranded picornavirus whose polyprotein, encoded by an open reading frame spanning most of the viral RNA, is processed by virus-encoded proteinases. Despite their genetic austerity, picornaviruses have retained long 5' untranslated regions, which harbour cis-acting elements that promote initiation of translation independently of the uncapped 5' end of the viral messenger RNA. These elements are termed 'internal ribosomal entry sites' and are formed from highly structured RNA segments of at least 400 nucleotides. How these elements function is not known, but special RNA-binding proteins may be involved. The ribosome or its 40S subunit probably binds at or near a YnXmAUG motif (where Y is a pyrimidine and X is a purine) at the 3' border of the internal ribosomal entry site, which either provides the initiating codon or enables the ribosome to translocate to one downstream (E.W. et al., submitted). Initiation from most eukaryotic messenger RNAs usually occurs by ribosomal recognition of the 5' and subsequent scanning to the AUG codon. Here we describe a genetic strategy for the dissection of polyproteins which proves that an internal ribosomal entry site element can initiate translation independently of the 5' end. 相似文献
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North TE Goessling W Walkley CR Lengerke C Kopani KR Lord AM Weber GJ Bowman TV Jang IH Grosser T Fitzgerald GA Daley GQ Orkin SH Zon LI 《Nature》2007,447(7147):1007-1011
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从植物生长环境中的微量元素调控着手,研究了一种新型植物生长促进剂的理化性质,探讨了该促进剂的生物学机理,比较了使用促进剂与未使用促进剂两种处理对叶类蔬菜、根类蔬菜和果实类蔬菜生物产量和品质,尤其是其对蔬菜叶片硝酸盐含量的影响.盆栽实验表明:该促进剂含有多种植物生长所必须的微量元素硫、铁、铝、锰、镁、钛、锌、钾、硼、钼、钙、铜等,施用该促进剂后,有利于蔬菜发芽生长,提高蔬菜叶绿素含量和果实含糖量,降低蔬菜硝酸盐含量. 相似文献
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Sabzali Javadov Sehwan Jang Rebecca Parodi-Rullán Zaza Khuchua Andrey V. Kuznetsov 《Cellular and molecular life sciences : CMLS》2017,74(15):2795-2813
Growing number of studies provide strong evidence that the mitochondrial permeability transition pore (PTP), a non-selective channel in the inner mitochondrial membrane, is involved in the pathogenesis of cardiac ischemia–reperfusion and can be targeted to attenuate reperfusion-induced damage to the myocardium. The molecular identity of the PTP remains unknown and cyclophilin D is the only protein commonly accepted as a major regulator of the PTP opening. Therefore, cyclophilin D is an attractive target for pharmacological or genetic therapies to reduce ischemia–reperfusion injury in various animal models and humans. Most animal studies demonstrated cardioprotective effects of PTP inhibition; however, a recent large clinical trial conducted by international groups demonstrated that cyclosporine A, a cyclophilin D inhibitor, failed to protect the heart in patients with myocardial infarction. These studies, among others, raise the question of whether cyclophilin D, which plays an important physiological role in the regulation of cell metabolism and mitochondrial bioenergetics, is a viable target for cardioprotection. This review discusses previous studies to provide comprehensive information on the physiological role of cyclophilin D as well as PTP opening in the cell that can be taken into consideration for the development of new PTP inhibitors. 相似文献
49.
在高性能混凝土构件无载荷养护早期,混凝土较大的自生收缩和温度变形在混凝土结构内部产生微裂纹将对高性能混凝土结构的耐久性产生不可忽视的影响。运用光纤布拉格光栅(FBC)埋设型传感器成功检测了高性能混凝土梁构件在其无载养护早期的应变和温度变化。由于布拉格光栅同时感应温度变化和应变,因此需要设置FBG温度传感器来补偿应变传感器的温度影响。FBG双传感器成功检测了高性能混凝土梁构件的早期变形性能和温度变化,试验结果表明高性能混凝土梁在养护早期无载阶段的自收缩变形比较大,浇注养护18h达到430με的最大值,同时分析了减水剂用量对高性能混凝土早期变形性能的影响。 相似文献
50.
Lee HJ Jang SH Kim H Yoon JH Chung KC 《Cellular and molecular life sciences : CMLS》2012,69(19):3301-3315
Parkinson's disease (PD) is characterized by a progressive loss of dopaminergic neurons in the substantia nigra. The cause of neuronal death in PD is largely unknown, but several genetic loci, including PTEN-induced putative kinase 1 (PINK1), have been linked to early onset autosomal recessive forms of familial PD. PINK1 encodes a serine/threonine kinase, which phosphorylates several substrates and consequently leads to cell protection against apoptosis induced by various stresses. In addition, research has shown that inflammation largely contributes to the pathogenesis of PD, but the functional link between PINK1 and PD-linked neuroinflammation remains poorly understood. Therefore, in the present study, we investigated the functional role of PINK1 in interleukin (IL)-1β-mediated inflammatory signaling. We show that PINK1 specifically binds to TRAF6 and TAK1, and facilitates the autodimerization and autoubiquitination of TRAF6. PINK1 also enhances the association between TRAF6 and TAK1, phosphorylates TAK1, and stimulates polyubiquitination of TAK1. Furthermore, PINK1 leads to the potentiation of IL-1β-mediated NF-κB activity and cytokine production. These findings suggest that PINK1 positively regulates two key molecules, TRAF6 and TAK1, in the IL-1β-mediated signaling pathway, consequently up-regulating their downstream inflammatory events. 相似文献