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  • 1
    Publication Date: 2011-04-09
    Description: Small nuclear RNAs (snRNAs) are essential factors in messenger RNA splicing. By means of homozygosity mapping and deep sequencing, we show that a gene encoding U4atac snRNA, a component of the minor U12-dependent spliceosome, is mutated in individuals with microcephalic osteodysplastic primordial dwarfism type I (MOPD I), a severe developmental disorder characterized by extreme intrauterine growth retardation and multiple organ abnormalities. Functional assays showed that mutations (30G〉A, 51G〉A, 55G〉A, and 111G〉A) associated with MOPD I cause defective U12-dependent splicing. Endogenous U12-dependent but not U2-dependent introns were found to be poorly spliced in MOPD I patient fibroblast cells. The introduction of wild-type U4atac snRNA into MOPD I cells enhanced U12-dependent splicing. These results illustrate the critical role of minor intron splicing in human development.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3380448/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3380448/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉He, Huiling -- Liyanarachchi, Sandya -- Akagi, Keiko -- Nagy, Rebecca -- Li, Jingfeng -- Dietrich, Rosemary C -- Li, Wei -- Sebastian, Nikhil -- Wen, Bernard -- Xin, Baozhong -- Singh, Jarnail -- Yan, Pearlly -- Alder, Hansjuerg -- Haan, Eric -- Wieczorek, Dagmar -- Albrecht, Beate -- Puffenberger, Erik -- Wang, Heng -- Westman, Judith A -- Padgett, Richard A -- Symer, David E -- de la Chapelle, Albert -- GM079527/GM/NIGMS NIH HHS/ -- GM093074/GM/NIGMS NIH HHS/ -- P30 CA16058/CA/NCI NIH HHS/ -- R01 GM079527/GM/NIGMS NIH HHS/ -- R01 GM079527-04/GM/NIGMS NIH HHS/ -- R01 GM093074/GM/NIGMS NIH HHS/ -- R01 GM093074-01A1/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2011 Apr 8;332(6026):238-40. doi: 10.1126/science.1200587.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Human Cancer Genetics Program, Ohio State University, Columbus, OH 43210, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21474760" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Chromosomes, Human, Pair 2/genetics ; Dwarfism/genetics/metabolism ; Female ; Fetal Growth Retardation/genetics/metabolism ; Humans ; Introns ; Inverted Repeat Sequences ; Male ; Microcephaly/genetics/metabolism ; *Mutation ; Nucleic Acid Conformation ; Osteochondrodysplasias/genetics/metabolism ; Pedigree ; *RNA Splicing ; RNA, Small Nuclear/chemistry/*genetics/metabolism ; Spliceosomes/*genetics/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2016-01-20
    Description: The Hofstadter energy spectrum provides a uniquely tunable system to study emergent topological order in the regime of strong interactions. Previous experiments, however, have been limited to low Bloch band fillings where only the Landau level index plays a role. We report measurements of high-mobility graphene superlattices where the complete unit cell of the Hofstadter spectrum is accessible. We observed coexistence of conventional fractional quantum Hall effect (QHE) states together with the integer QHE states associated with the fractal Hofstadter spectrum. At large magnetic field, we observed signatures of another series of states, which appeared at fractional Bloch filling index. These fractional Bloch band QHE states are not anticipated by existing theoretical pictures and point toward a distinct type of many-body state.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Lei -- Gao, Yuanda -- Wen, Bo -- Han, Zheng -- Taniguchi, Takashi -- Watanabe, Kenji -- Koshino, Mikito -- Hone, James -- Dean, Cory R -- New York, N.Y. -- Science. 2015 Dec 4;350(6265):1231-4. doi: 10.1126/science.aad2102.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA. Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, USA. ; Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA. ; Department of Physics, Columbia University, New York, NY 10027, USA. ; National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. ; Department of Physics, Tohoku University, Sendai 980-8578, Japan. ; Department of Physics, Columbia University, New York, NY 10027, USA. cdean@phys.columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26785484" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2018-09-22
    Description: Experimental results (Huang et al .) indicated that nanotwinned diamond (nt-diamond) has unprecedented hardness, whose physical mechanism has remained elusive. In this report, we categorize interaction modes between dislocations and twin planes in nt-diamond and calculate the associated reaction heat, activation energies, and barrier strength using molecular dynamics. On the basis of the Sachs model, twin thickness dependence of nt-diamond hardness is evaluated, which is in good agreement with the experimental data. We show that two factors contribute to the unusually high hardness of nt-diamond: high lattice frictional stress by the nature of carbon bonding in diamond and high athermal stress due to the Hall-Petch effect. Both factors stem from the low activation volumes and high activation energy for dislocation nucleation and propagation in diamond twin planes. This work provides new insights into hardening mechanisms in nt-diamond and will be helpful for developing new superhard materials in the future.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 4
    Publication Date: 2005-09-02
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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