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  • 1
    Publication Date: 2010-10-22
    Description: Two forms of X-chromosome inactivation (XCI) ensure the selective silencing of female sex chromosomes during mouse embryogenesis. Imprinted XCI begins with the detection of Xist RNA expression on the paternal X chromosome (Xp) at about the four-cell stage of embryonic development. In the embryonic tissues of the inner cell mass, a random form of XCI occurs in blastocysts that inactivates either Xp or the maternal X chromosome (Xm). Both forms of XCI require the non-coding Xist RNA that coats the inactive X chromosome from which it is expressed. Xist has crucial functions in the silencing of X-linked genes, including Rnf12 (refs 3, 4) encoding the ubiquitin ligase RLIM (RING finger LIM-domain-interacting protein). Here we show, by targeting a conditional knockout of Rnf12 to oocytes where RLIM accumulates to high levels, that the maternal transmission of the mutant X chromosome (Deltam) leads to lethality in female embryos as a result of defective imprinted XCI. We provide evidence that in Deltam female embryos the initial formation of Xist clouds and Xp silencing are inhibited. In contrast, embryonic stem cells lacking RLIM are able to form Xist clouds and silence at least some X-linked genes during random XCI. These results assign crucial functions to the maternal deposit of Rnf12/RLIM for the initiation of imprinted XCI.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2967734/" 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/PMC2967734/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shin, Jongdae -- Bossenz, Michael -- Chung, Young -- Ma, Hong -- Byron, Meg -- Taniguchi-Ishigaki, Naoko -- Zhu, Xiaochun -- Jiao, Baowei -- Hall, Lisa L -- Green, Michael R -- Jones, Stephen N -- Hermans-Borgmeyer, Irm -- Lawrence, Jeanne B -- Bach, Ingolf -- 5 P30 DK32520/DK/NIDDK NIH HHS/ -- DK32520/DK/NIDDK NIH HHS/ -- GM053234/GM/NIGMS NIH HHS/ -- R01 CA131158/CA/NCI NIH HHS/ -- R01 CA131158-04/CA/NCI NIH HHS/ -- R01 GM033977/GM/NIGMS NIH HHS/ -- R01 GM053234/GM/NIGMS NIH HHS/ -- R01CA131158/CA/NCI NIH HHS/ -- Howard Hughes Medical Institute/ -- England -- Nature. 2010 Oct 21;467(7318):977-81. doi: 10.1038/nature09457.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Gene Function and Expression, University of Massachusetts Medical School (UMMS), Worcester, Massachusetts 01605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20962847" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Congenic ; Blastocyst/metabolism ; Cell Line ; Chromosomes, Mammalian/*genetics ; Embryo Loss/genetics ; Fathers ; Female ; Gene Silencing ; *Genomic Imprinting ; Male ; Mice ; Mice, Transgenic ; *Mothers ; RNA, Long Noncoding ; RNA, Untranslated/genetics ; Repressor Proteins/deficiency/genetics/*metabolism ; Ubiquitin-Protein Ligases ; X Chromosome/*genetics ; X Chromosome Inactivation/*genetics
    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: 2015-12-19
    Description: In terrestrial ecosystems, plants take up phosphate predominantly via association with arbuscular mycorrhizal fungi (AMF). We identified loss of responsiveness to AMF in the rice (Oryza sativa) mutant hebiba, reflected by the absence of physical contact and of characteristic transcriptional responses to fungal signals. Among the 26 genes deleted in hebiba, DWARF 14 LIKE is, the one responsible for loss of symbiosis . It encodes an alpha/beta-fold hydrolase, that is a component of an intracellular receptor complex involved in the detection of the smoke compound karrikin. Our finding reveals an unexpected plant recognition strategy for AMF and a previously unknown signaling link between symbiosis and plant development.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gutjahr, Caroline -- Gobbato, Enrico -- Choi, Jeongmin -- Riemann, Michael -- Johnston, Matthew G -- Summers, William -- Carbonnel, Samy -- Mansfield, Catherine -- Yang, Shu-Yi -- Nadal, Marina -- Acosta, Ivan -- Takano, Makoto -- Jiao, Wen-Biao -- Schneeberger, Korbinian -- Kelly, Krystyna A -- Paszkowski, Uta -- PDAG/223 T39/Biotechnology and Biological Sciences Research Council/United Kingdom -- New York, N.Y. -- Science. 2015 Dec 18;350(6267):1521-4. doi: 10.1126/science.aac9715.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Plant Molecular Biology, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland. Faculty of Biology, Genetics, University of Munich, Biocenter Martinsried, Grosshaderner Strasse 2-4, 82152 Martinsried, Germany. ; Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK. ; Division of Plant Sciences, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan. Botanical Institute, Molecular Cell Biology, Karlsruhe Institute of Technology, Kaiserstrasse 2, 76131 Karlsruhe, Germany. ; Faculty of Biology, Genetics, University of Munich, Biocenter Martinsried, Grosshaderner Strasse 2-4, 82152 Martinsried, Germany. ; Department of Plant Molecular Biology, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland. ; Max Planck Institute for Plant Breeding Research, Carl-von-Linne-Weg 10, D-50829 Cologne, Germany. ; Division of Plant Sciences, National Institute of Agrobiological Sciences, 2-1-2 Kannondai, Tsukuba, Ibaraki 305-8602, Japan. ; Department of Plant Molecular Biology, University of Lausanne, Biophore Building, 1015 Lausanne, Switzerland. Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EA, UK. up220@cam.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26680197" target="_blank"〉PubMed〈/a〉
    Keywords: Furans/*metabolism ; Hydrolases/genetics/*metabolism ; Mycorrhizae/*physiology ; Oryza/*enzymology/genetics/*microbiology ; Phosphates/metabolism ; Plant Proteins/genetics/*metabolism ; Pyrans/*metabolism ; Symbiosis/genetics/*physiology ; Transcription, Genetic
    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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