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  • 1995-1999  (15)
  • 1955-1959
  • 1940-1944
  • 1930-1934
  • 1999  (15)
  • gene transfer
  • somaclonal variation
  • somatic hybridization
Source
Material
Years
  • 1995-1999  (15)
  • 1955-1959
  • 1940-1944
  • 1930-1934
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    The use of image analysis to study developmental variation in micropropagated potato (Solanum tuberosum L.) plants (1999)
    Springer
    Potato research 42 (1999), S. 541-548 
    Details
    ISSN: 1871-4528
    Keywords: epigenetic variation ; leaf ontogeny ; somaclonal variation ; tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Potato leaf morphology changes during plant development with the phase shift from vegetative growth to flowering. Image analysis can detect differences in leaf morphology and has been used here to distinguish differences in leaf morphology between potato crops derived from seed tubers and minitubers and between crops derived from different micropropagation protocols. Further, leaf shape parameters can be used to determine the relative maturity of crops. This finding is of economic importance since differences in plant development, for example delayed flowering, are associated with yield parameters. It is hypothesised that image analysis of established microplants can be used as an early evaluation of micropropagation protocols for potato.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358170
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  • 2
    Electronic Resource
    Electronic Resource
    Stable Long Term Germ-Line Transmission of Transgene Integration Sites in Mice (1999)
    Springer
    Transgenic research 8 (1999), S. 1-8 
    Details
    ISSN: 1573-9368
    Keywords: gene construct ; gene transfer ; heritability ; marker gene ; pigmentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Transgenic mice provide a valuable tool in all fields of basic and applied biological and medical research. In this study, we describe the fate of integrated transgenes in the mammalian host genome over a large number of generations. The stability of the germ-line transmission of integrated tyrosinase transgene copies was monitored up to generation F20 in a large number of individuals from seven transgenic mouse lines. Phenotypic and molecular genetic analysis of the offspring both within the different lines and in cross-breeding experiments revealed the high stability of the transgene integration sites in mice. Only very few individuals were affected by a transgene copy loss. These results indicate that, once homozygous transgenic lines are established, breeding programs can be continued to a high number of generations without further stringent molecular genetic analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008824028100
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  • 3
    Electronic Resource
    Electronic Resource
    Somaclonal variation in insect‐resistant transgenic sugarcane (Saccharum hybrid) plants produced by cell electroporation (1999)
    Springer
    Transgenic research 8 (1999), S. 349-360 
    Details
    ISSN: 1573-9368
    Keywords: Bacillus thuringiensis ; Borer disease ; Saccharum ; somaclonal variation ; transgenic sugarcane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A population of 42 transgenic sugarcane ( hybrid, cv. Ja60‐5) clones expressing a truncated cryIA(b) gene from Bacillus thuringiensis was evaluated in field trials under artificial borer (Diatraea saccharalis Fab.) infection. Five clones displaying the highest borer tolerance were selected and analysed with molecular tools (RAPD, AFLP and RAMP) to verify genomic changes. Results of field trials provided evidence both for the expression of the resistance trait and for the occurrence of limited but consistent morphological, physiological and phytopathological variation, as compared with control plants regenerated from dedifferentiated culture without transformation (C1‐control) or with plants that were clonally propagated in the field (C2‐control). The five elite transgenic clones, selected for consistent borer‐resistance and good agronomic traits, were further evaluated in a large scale field trial. It was found that the majority of agronomic and industrial traits were those of the original cv. Ja60‐5, but that a small number of qualitative traits was different. DNA changes were verified in the five selected clones. A total of 51 polymorphic DNA bands (out of the 1237 analysed bands) was identified by extensive AFLP and RAMP analysis, thus showing rare but consistent genomic changes in the transgenic plants, as compared with C1‐ and C2‐control plants. It is proposed that the increased variability verified in transgenic plants by field trials and DNA analysis is essentially correlated with cell growth in the dedifferentiated state during the transformation procedure. The results, which are consistent with those published in the case of other transgenic plant populations, are discussed in the context of selecting approaches to gene transfer that minimize somaclonal variation. This is important especially in cases, such as that of sugarcane, where success of backcrosses to restore the original genotype is made difficult by the complex ploidy state of the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008900230144
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  • 4
    Electronic Resource
    Electronic Resource
    Gene transfer into canine myoblasts (1999)
    Springer
    Cytotechnology 30 (1999), S. 181-189 
    Details
    ISSN: 1573-0778
    Keywords: culture ; dog ; Duchenne dystrophy ; gene transfer ; satellite cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We have developed and characterized cultures of healthy and dystrophic canine myoblasts for the evaluation of various gene transfer protocols. The number of desmin-positive myoblasts was elevated (〉〉80%) in cultures of myoblasts obtained from different muscle territories, the diaphragm muscle giving rise to the purest cultures. Myoblasts from dogs turned out to be a very convenient source of well transfectable and transducible cells. Transfection with plasmid DNA allowed efficient transgene expression (50% of β-galactosidase positive cells and about 375 ng luciferase/mg protein after transfection with a calcium phosphate-precipitated plasmid). Infection with high concentrations of adenoviral and retroviral vectors allowed transgene (β-galactosidase or mini-dystrophin) detection in about 75 to 90% of the canine cells. Therefore, primary dog myoblast cultures represent a useful in vitro model for viral and non-viral gene delivery, as well as for functional evaluation and cell grafting with applications in genetic diseases, vaccination or production of circulating therapeutic proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008026913715
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  • 5
    Electronic Resource
    Electronic Resource
    Adenovirus-mediated Gene Transfer of a Truncated Form of Fibroblast Growth Factor Receptor Inhibits Growth of Glioma Cells both In Vitro and In Vivo (1999)
    Springer
    Journal of neuro-oncology 44 (1999), S. 195-203 
    Details
    ISSN: 1573-7373
    Keywords: adenovirus ; dominant negative ; fibroblast growth factor receptor ; gene transfer ; glioma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Basic fibroblast growth factor (FGF-2) and high affinity FGF receptor (FGFR) have been detected in the nucleus as well as the cytoplasm of many human gliomas, and are known to stimulate cellular proliferation and angiogenesis in the tumors. To investigate the effects of inactivation of FGFR on the growth of malignant gliomas, we constructed a replication-deficient recombinant adenovirus vector encoding a truncated form of chicken FGFR1 (AxCA Δ FR). AxCA Δ FR-infected cells were confirmed to express truncated FGFR protein by immunoblotting and FGF-2-dependent clonogenicity of NIH3T3 cells was suppressed by infection with this virus vector. Then human malignant glioma cell lines U-251MG and T98G, both of which have been reported to express FGF-2 and FGFR, were infected with AxCA Δ FR. These infected cells showed nuclear as well as cytoplasmic expression of a truncated FGFR protein. Proliferation rate and the ability to form colonies in soft agar of the cells infected with this virus vector were significantly suppressed compared with those of uninfected and lacZ-expressing adenovirus-infected cells. Moreover, intratumoral injection of AxCA Δ FR significantly suppressed the subcutaneous tumor growth of the glioma cells in nude mice. We concluded that inactivation of the cytoplasmic and nuclear FGFR using this truncated FGFR-expressing adenovirus vector can inhibit the growth of malignant gliomas both in vitro and in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006355014351
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  • 6
    Electronic Resource
    Electronic Resource
    Glycotargeting: Influence of the Sugar Moiety on Both the Uptake and the Intracellular Trafficking of Nucleic Acid Carried by Glycosylated Polymers (1999)
    Springer
    Bioscience reports 19 (1999), S. 125-132 
    Details
    ISSN: 1573-4935
    Keywords: Oligonucleotides ; gene transfer ; routing ; membrane lectins ; glycoconjugates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Nucleic acids (plasmids as well as oligonucleotides) used to specifically express or modulate the expression of a gene, must reach the cytosol and/or the nucleus. Several systems have been developed to increase their uptake and their efficiency. Glycosylated polylysines have been shown to specifically help nucleic acids to be taken up in cells expressing a given cell surface membrane lectin. However, it appeared that the efficiency of the imported nucleic acid was not directly related to the extent of the uptake. Indeed, some glycosylated polylysines bearing sugar moities which are poor ligands of the cell surface lectins of a given cell were found to be more efficient than those bearing better sugar ligands. The interpretation of this paradoxal result is discussed with regards to the nature of the compartment allowing the nucleic acid to cross the membrane and to be delivered in the cytosol on the one hand, and to the presence of intracellular lectins on the other hand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020114611517
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  • 7
    Electronic Resource
    Electronic Resource
    The S7 ribosomal protein gene is truncated and overlaps a cytochrome c biogenesis gene in pea mitochondria (1999)
    Springer
    Plant molecular biology 40 (1999), S. 91-97 
    Details
    ISSN: 1573-5028
    Keywords: cytochrome c biogenesis ; gene transfer ; mitochondria ; pea ; ribosomal protein ; soybean
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The pea mitochondrial genome contains a truncated rps7 gene lacking ca. 40 codons at its 5′ terminus. This single-copy sequence is immediately downstream of and slightly overlapping an actively transcribed and edited reading frame of 744 bp (designated ccb248) homologous to the bacterial helC gene which encodes a subunit of the ABC-type heme transporter involved in cytochrome c biogenesis. This region of mitochondrial DNA appears recombinogenic, and the carboxy-termini of helC-type proteins are predicted to vary in sequence and length among plants. Sequences corresponding to the 5′ coding region of rps7 were not detected elsewhere in the pea mitochondrial genome using wheat rps7 probes, and only a very short internal rps7 segment was observed in soybean mitochondrial DNA. The presence of rps7-homologous sequences in the nuclear genomes of pea and soybean is consistent with the recent transfer of a functional mitochondrial rps7 gene to the nucleus in certain plant lineages.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026499906338
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  • 8
    Electronic Resource
    Electronic Resource
    Mycoplasma-Mediated Uptake of the Exogenous Human BRCA1 Gene by Hatching Blastocysts (1999)
    Springer
    Journal of assisted reproduction and genetics 16 (1999), S. 546-550 
    Details
    ISSN: 1573-7330
    Keywords: breast cancer ; mycoplasma ; Ureaplasma urealyticum ; foreign DNA ; gene transfer ; transgenic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: Biological vectors for cell transfection are mainly viral in origin, with inherent shortcomings. Mycoplasmas are ubiquitous organisms that traverse cells easily. The objective was to determine if Ureaplasma urealyticum (T-mycoplasma) would vector exogenous BRCA1 DNA into blastocysts. Methods: Hatching mouse blastocysts (N = 70) were incubated in the presence of either viable or dead Ureaplasma urealyticum at 37°C for 1 hr. The blastocysts were exposed to human BRCA1 DNA lacking homology in the mouse genome for 2 hr, followed by DNase-I treatment and wash. Polymerase chain reaction and agarose gel electrophoresis analysis of amplified products were performed. Results: The BRCA1 gene was detected in the blastocysts only when viable Ureaplasma was present. PCR analyses of control Ureaplasma and untreated blastocysts were negative. Conclusion: Viable Ureaplasma organisms were shown to mediate the uptake of DNA fragments into blastocysts, resulting in transgenic mouse blastocysts with a normal human BRCA1 exon 11 gene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020553322073
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  • 9
    Electronic Resource
    Electronic Resource
    Selection of downy mildew resistant somaclones, from a susceptible B line of pearl millet (1999)
    Springer
    Plant cell, tissue and organ culture 58 (1999), S. 159-162 
    Details
    ISSN: 1573-5044
    Keywords: agronomic traits ; Pennisetum glaucum ; Sclerospora graminicola ; somaclonal variation ; tissue culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plants regenerated from seed-derived callus of a PNMS 6B line of pearl millet (Pennisetum glaucum (L.) R. Br.) were evaluated for their resistance induced by somaclonal variation for downy mildew disease caused by Sclerospora graminicola (Sacc.) Schroter. Among the 201 lines regenerated, only 3 lines consistently proved highly resistant (free from disease incidence) for up to 5 generations; whereas, 17 lines were resistant (disease incidence ranging from 1 to 9%). Resistance was confirmed by testing the plants under both laboratory and field conditions. The plants were evaluated for their agronomic traits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006347113434
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  • 10
    Electronic Resource
    Electronic Resource
    Tissue culture and Agrobacterium-mediated transformation of watercress (1999)
    Springer
    Plant cell, tissue and organ culture 58 (1999), S. 171-176 
    Details
    ISSN: 1573-5044
    Keywords: Bacillus thuringiensis Brassicaceae ; gene transfer ; insect resistance ; plant regeneration ; Rorippa nasturtium-aquaticum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Adventitious shoot regeneration could be obtained from more than 80% of the calluses initiated from stem explants of watercress (Rorippa nasturtium-aquaticum) by using an induction medium and a shoot regeneration medium. The induction medium contained 1.15 μM 2,4-dichlorophenoxyacetic acid and 5 μM thidiazuron; the shoot regeneration medium was composed of 0.5 μM thidiazuron and 2.25 μM 6-benzylaminopurine. This regeneration procedure was incorporated into an Agrobacterium-mediated transformation procedure for gene transfer into watercress. Factors affecting transformation included preculture, selection agents, use of tobacco nurse cells, and the length of coculture. A transgenic line of watercress transformed with a wild-type Bacillus thuringiensis insecticidal gene, cry1Ia3, was not toxic to larvae of the diamondback moth (Plutella xylostella), presumably due to premature polyadenylation of the transcript encoded by this gene in the plant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006399130272
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  • 11
    Electronic Resource
    Electronic Resource
    Use of fluorescein diacetate (FDA) to determine ploidy of in vitro watermelon shoots (1999)
    Springer
    Plant cell, tissue and organ culture 58 (1999), S. 199-203 
    Details
    ISSN: 1573-5044
    Keywords: triploid watermelon ; seedless watermelon ; tetraploid watermelon ; plant breeding ; somaclonal variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ploidy of watermelon [Citrullus lanatus (Thunb.) Matsum. and Nakai shoots and plantlets was estimated by painting the lower epidermis of intact in vitro-derived leaves with fluorescein diacetate (FDA) and observing fluorescence of guard cell chloroplasts with a microscope and UV light. Leaves from in vitro shoot-tip cultures of known diploid cultivars and tetraploid breeding lines were used to establish the mean number of chloroplasts per guard cell pair. Leaves from diploid and tetraploid shoot cultures had 9.7 and 17.8 chloroplasts per guard cell pair, respectively. This method then was used to estimate the ploidy of shoots regenerated from cotyledon explants of the diploid cultivar Minilee. Approximately 11% of the 188 regenerated shoots were classified as tetraploid during in vitro culture. Putative tetraploids were transplanted to the field and self-pollinated. About 45% of tetraploids identified in vitro produced fruit and viable seed. Chloroplast counts of R1 progeny were used to confirm their ploidy. All of the putative diploids were confirmed diploid and all putative tetraploids proved to be non-chimeric true breeding tetraploids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006371516394
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  • 12
    Electronic Resource
    Electronic Resource
    DNA analysis of potato + Solanum brevidens somatic hybrid lines (1999)
    Springer
    Euphytica 105 (1999), S. 103-107 
    Details
    ISSN: 1573-5060
    Keywords: Erwinia carotovora ; Solanum tuberosum ; somaclonal variation ; RAPD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Three somatic hybrid lines between potato (cv. While Lady line no. Ke 79, 2n = 2x = 48) + Solanum brevidens (PI 218228, 2n = 2x = 24) were evaluated using randomly amplified polymorphic DNA (RAPD) markers. The lines originated from the same callus but showed different reactions to Erwinia carotovora ssp. carotovora, the cause of potato soft rot. By the use of 48 oligomer primers producing 99 scorable bands, DNA polymorphism were detected on 7 of 12 S. brevidens chromosomes. Loss of certain DNA segments on chromosome 5, 6, 9 and 11 were observed. Some of the variations could have taken place in early callus stage of development; others may have occurred after initiation of individual shoot regeneration. The possible involvement of missing RAPD products specific to one somatic hybrid that shows decreased resistance to bacterial soft rot is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003451327553
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  • 13
    Electronic Resource
    Electronic Resource
    Intracellular fate and nuclear targeting of plasmid DNA (1999)
    Springer
    Cell biology and toxicology 15 (1999), S. 193-202 
    Details
    ISSN: 1573-6822
    Keywords: DNA ; gene transfer ; importin ; nuclear import ; nuclear localization signal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract One of the major steps limiting nonviral gene transfer efficiency is the entry of plasmid DNA from the cytoplasm into the nucleus of the transfected cells. The nuclear localization signal (NLS) of the SV40 large T antigen is known to efficiently induce nuclear targeting of proteins. We have developed two chemical strategies for covalent coupling of NLS peptides to plasmid DNA. One method involves a site-specific labeling of plasmid DNA by formation of a triple helix with an oligonucleotide–NLS peptide conjugate. After such modification with one NLS peptide per plasmid molecule, plasmid DNA remained fully active in cationic lipid-mediated transfection. In the other method, we randomly coupled 5–115 p-azidotetrafluorobenzyllissamine–NLS peptide molecules per plasmid DNA by photoactivation. Oligonucleotide–NLS and plasmid–lissamine–NLS conjugates interacted specifically with the NLS-receptor importin α. Plasmid–lissamine–NLS conjugates were not detected in the nucleus, after cytoplasmic microinjection. Plasmids did not diffuse from the site of injection and plasmid–lissamine–NLS conjugates appeared to be progressively degraded in the cytoplasm. The process of plasmid DNA sequestration/degradation stressed in this study might be as important in limiting the efficiency of nonviral gene transfer as the generally recognized entry step of plasmid DNA from the cytoplasm into the nucleus
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007693805849
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  • 14
    Electronic Resource
    Electronic Resource
    A Novel Non-Viral Vector for DNA Delivery Based on Low Molecular Weight, Branched Polyethylenimine: Effect of Molecular Weight on Transfection Efficiency and Cytotoxicity (1999)
    Springer
    Pharmaceutical research 16 (1999), S. 1273-1279 
    Details
    ISSN: 1573-904X
    Keywords: gene transfer ; cytotoxicity ; polyethylenimine ; polyfection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Purpose. Low molecular weight branched polyethylenimine (LMW-PEI) was synthesized and studied as a DNA carrier for gene delivery with regard to physico-chemical properties, cytotoxicity, and transfection efficiency. Methods. The architecture of LMW-PEI, synthesized by acid catalyzed ring-opening polymerization of aziridine was characterized by size exclusion chromatography in combination with laser light scattering and 13C-NMR-spectroscopy. In vitro cytotoxic effects were quantified by LDH and MTT assay and visualized by transmission electron microscopy. The potential for transgene expression was monitored in ECV304 cells using luciferase driven by a SV40 promoter as reporter gene system. Results. LMW-PEI (Mw 11′900 D) with a low degree of branching was synthesized as a DNA carrier for gene delivery. In contrast to high molecular weight polyethylenimines (HMW-PEI; Mw l′616′OOO D), the polymer described here showed a different degree of branching and was less cytotoxic in a broad range of concentrations. As demonstrated by transmission electron microscopy the LMW-PEI formed only small aggregates which were efficiently taken up by different cells in the presence of serum, most likely by an endocytic pathway. LMW-PEI yielded transfection efficiencies measured via expression of the reporter gene luciferase which were up to two orders of magnitude higher than those obtained with HMW-PEI. The reporter gene expression was concentration dependent, but in contrast to lipofection independent of serum addition. Conclusions. The LMW-PEI described here is a new, highly efficient, and non-cytotoxic vector with a favorable efficiency/toxicity profile for gene therapeutic applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1014861900478
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  • 15
    Electronic Resource
    Electronic Resource
    Evolution of gene transfer in bacteria (1999)
    Springer
    World journal of microbiology and biotechnology 15 (1999), S. 1-6 
    Details
    ISSN: 1573-0972
    Keywords: Bacteria ; conjugation ; DNA ; evolution ; gene transfer ; transduction ; transformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The transfer of genetic information by transformation, conjugation and transduction in bacteria occurs frequently in nature. These diverse gene transfer mechanisms in bacteria are the result of evolution and are not linked to reproduction as in eukaryotic organisms. In this review, gene transfer in bacteria will be considered from an evolutionary perspective.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008830914223
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