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  • 1
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    Nicotinic acid limitation regulates silencing of Candida adhesins during UTI (2005)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2005-03-19
    Description: The adherence of Candida glabrata to host cells is mediated, at least in part, by the EPA genes, a family of adhesins encoded at subtelomeric loci, where they are subject to transcriptional silencing. We show that normally silent EPA genes are expressed during murine urinary tract infection (UTI) and that the inducing signal is the limitation of nicotinic acid (NA), a precursor of nicotinamide adenine dinucleotide (NAD+). C. glabrata is an NA auxotroph, and NA-induced EPA expression is likely the result of a reduction in NAD+ availability for the NAD+-dependent histone deacetylase Sir2p. The adaptation of C. glabrata to the host, therefore, involves a loss of metabolic capacity and exploitation of the resulting auxotrophy to signal a particular host environment.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Domergue, Renee -- Castano, Irene -- De Las Penas, Alejandro -- Zupancic, Margaret -- Lockatell, Virginia -- Hebel, J Richard -- Johnson, David -- Cormack, Brendan P -- 2PO1DK49720/DK/NIDDK NIH HHS/ -- R01AI46223/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2005 May 6;308(5723):866-70. Epub 2005 Mar 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15774723" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Candida glabrata/*genetics/growth & development/*pathogenicity/physiology ; Candidiasis/*microbiology ; Cell Adhesion ; Culture Media ; Female ; Gene Expression Regulation, Fungal ; *Gene Silencing ; Genes, Fungal ; Histone Deacetylases/genetics/metabolism ; Lectins/*genetics ; Mice ; Mice, Inbred BALB C ; Mice, Inbred CBA ; NAD/metabolism ; Niacin/administration & dosage/*metabolism/pharmacology/urine ; Niacinamide/pharmacology/urine ; Sirtuins/genetics/metabolism ; Transcription, Genetic ; Urinary Bladder/microbiology ; Urinary Tract Infections/*microbiology ; Urine/microbiology ; Urothelium/microbiology ; Virulence
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    Embryogenic cell suspensions from the male flower of Musa AAA cv. Grand nain (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 97 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: There are very few reports on the establishment of long-term embryogenic cell cultures of banana, especially of triploid cultivars of commercial interest. Embryogenic cell suspensions were prepared using the cultivar Grand nain, the most widely grown dessert banana in the world. After culture for 5 or 6 months of immature male flowerbuds adjacent to the floral apex, yellow, compact calluses and white, friable embryogenic tissues were induced. Suspension cultures were initiated from embryogenic tissues placed in liquid medium. The packed cell volume (PCV) of the suspensions increased 2- to 5- fold with each monthly culture cycle. Plating of the embryogenic suspensions resulted in approximately 370×103 embryos per ml of PCV. Depending on the size of embryos, 3 to 20% germination was observed. A histological survey of cell suspensions and embryo development was carried out. Cellular aggregates with cells displaying typical embryogenic features were formed. Most of the somatic embryos were probably of unicellular origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1399-3054.1996.970211.x
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  • 3
    Electronic Resource
    Electronic Resource
    Field performance of embryogenic cell suspension-derived banana plants (Musa AAA, cv. Grande naine) (2000)
    Springer
    Euphytica 112 (2000), S. 245-251 
    Details
    ISSN: 1573-5060
    Keywords: banana ; embryogenic cell suspension ; micropropagation ; Musa ; somaclonal variation ; somatic embryogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Growth and yield characteristics of two different clones of banana plants (Musa AAA cv. Grande naine) originating from four months old embryogenic cell suspensions were studied. These characteristics were compared with those plants produced by the conventional in vitro budding multiplication method. Two types of variants were observed during the acclimatization phase among 500 embryogenic cell suspension derived plants. The first type related to banana plants with `variegated or deformed leaves' were also observed in in vitro budding derived plants. The second type concerned `fasciated-leafed' plants. During the field growth, these two variant types produced plants morphologically similar to the other plants. Thus, none of the cell suspension derived plants exhibited off-type traits in the field. A Fisher block model was used to compare the field performances of the two clones produced through the two in vitro propagation techniques. The analysis of variance showed that there were no significant differences between the plants produced by either micropropagation techniques for the plant height and circumference, the length of the reference leaf, the number of nodal clusters of the inflorescence and of fruits, the bunch weight, the period of time between planting and flowering, and between planting and harvesting. This study showed that banana plants with an agronomical behaviour similar to those produced by the conventional in vitro budding method could be regenerated from embryogenic cell suspension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003960724547
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