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  • Articles  (191,512)
  • 1980-1984  (191,512)
  • Medicine  (154,125)
  • Process Engineering, Biotechnology, Nutrition Technology  (37,387)
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  • Articles  (191,512)
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  • 1
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Five human teratoma cell lines have been characterized for the presence of a certain number of marker antigens whose presence or absence has been shown to be characteristic of mouse embryonal carcinoma (EC) cells. Four out of the five lines have been shown to respond to at least some of the criteria associated with murine EC cells even though only limited in vitro differentiation could be demonstrated. The significance of certain unusual marker antigen combinations present on the cell line Tera I and its clones and so far unobserved for the murine model is discussed. The observation in Tera I populations of cells carrying simultaneously both the F9 and β2-microglobulin or HLA antigens, suggest that the human cell lines may represent a novel material for the study of mammalian differentiation.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 8 (1981), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Principles of Gene Manipulation. Studies in Microbiology
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: A healthy 22-year-old woman was noted to have erythrocytes of the Pk phenotype: a strong Pk antigen, no detectable P antigen and anti-P antibody in her serum. Her erythrocytes contained four to six times as much Pk glycolipid (globotriaosylceramide or CTH) and approximately half as much P glycolipid (globotertraosylceramide or globoside) as normal red cells. The structures of CTH and globoside were characterized by analysis of permethylated sugars and complement fixation in addition to chromaographic mobility and sugar composition. Inasmuch as the erythrocytes of two Pk individuals that were analysed previously (Marcus et al., 1976) contained no detectable globoside, these abnormalities appear o represent a new phenotype in the P blood group system.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: We studied 201 unrelated French Basque individuals for HLA and Bf polymorphisms. The haplotypes of eighty-seven of them were deduced from family studies. The results show the frequency of the Bf F1 allele (0.1393) which is the highest one currently reported. They confirm the high frequencies of HLA-Aw19.2 and B18 previously reported in that population and show that a whole haplotype with strong linkage disequilibria, namely Aw19.2, Cw5, B18, Bf F1, DRw3 is frequent. On the other hand, the gene frequency of Bf S is decreased (0.5497) as compared with the other European Caucasoïd populations, while a slight increase in the Bf F gene frequency (0.2960) appears. These results point out that it is of importance to consider the genetic background in choosing the population where linkage disequilibria are to be studied.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The genetic control of hybrid resistance to BALB/c fibrosarcoma Meth-A was investigated. A Meth-A tumour grew slower in (BALB/c X C57BL/6)F1 and reciprocal hybrid mice than in syngeneic BALB/c mice and was also found to grow slower in females than in males. Significant F1 resistance was demonstrated after both subcutaneous and intraperitoneal injection of tumour cells. However, (BALB/c X DBA/2)F1 mice did not show any significant resistance to Meth-A. In H-2 linkage studies of [BALB/c X (BALB/c X C57BL/6)] backcross mice, no statistically significant differences in the resistance of H-2 heterozygotes and homozygotes to Meth-A were observed. These results indicated that F1 hybrid resistance to Meth-A was controlled by non-H-2-linked resistance factor(s). No linkage was observed between resistance to Meth-A and coat colour c- and b-loci.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: CBA/N mice have an X-linked B cell defect which prevents them from responding to non-mitogenic thymic independent (TI-II) antigens such as dinitrophenylated (DNP-AGG) Ficoll. The F1 male progeny of CBA/N female mice express the same defect. Spleen cell suspensions from such defective mice (CBA/N X C3H/HeN F1 males) could not respond to DNP-AGG-Ficoll following in vitro immunization and subsequent transfer into irradiated, syngeneic, F1 male recipients as expected. In contrast, normal CBA/N X C3H/HeN F1 female spleen cells could respond and effect a ‘rescue'; they mounted strong plaque-foriming cell 7 days after in vitro exposure to DNP-AGG-Ficoll and subsequent transfer into irradiated F1 male recipients. Defective F1 male spleen cells could bind significant quantities of DNP-AGG-Ficoll, however, after, in vitro exposure. Extensive washing of these spleen cells could not reverse this binding. Such DNP-AGG-Ficoll-exposed and washed F1 male spleen cells could, after transfer, aid normal untreated F1 female cells in their rescue function. The defective F1 male spleen cells could convey immunogenic quantities of DNP-AGG-Ficoll to the ‘rescuing’ F1 female cells.Mitomycin treatment of F1 male cells did not interfere with their conveyor function. Goat anti-mouse μ serum impeded the passive antigen conveyor function of defective F1 male cells as did prior exposure to high concentrations of free DNP-AGG hapten. Our data support the view that the B cell defect of CBA/N X C3H/HeN F1 male mice does not relate to antigen binding, but rather to an inability to be effectively triggered by certain cell-bound polymeric antigens.
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Results of a population study with all currently available B-cell specific alloantisera indicate that eight antigens controlled by the RhLA-linked DR locus can now be identified. This leaves a gene frequency of about 0.15 for unidentified or ‘blank’ antigens of that locus. Of the nine identifiable la antigens which are not controlled by the DR locus, three or four may form the basis of a second series which is probably also controlled by the RhLA region.
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  • 9
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Induction of tolerance to bovine serum albumin was studied in mice selected for high (H) or low (L) antibody responsiveness and in their F1 hybrids. No high or low zone tolerances were obtained in H mice whereas L mice were susceptible to tolerance induction by the two schedules. H mice were immunized by repeated injections of tolerogenic BSA for low zone tolerance induction but not after the administration of a single high dose of tolerogenic BSA. Resistance to tolerance induction is dominant in F1 hybrids.
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 7 (1980), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: An attempt is made to account for immunoglobulin chain synthesis in terms of genetic events involving IS or controlling elements analogous to those found in bacteria, maize and drosophila. Transposition of variable and constant genes and normal immunoglobulin chain synthesis as well as qualitative and quantitative abnormalities might be explained by such regulatory elements. Intrachromosomal transpositions over short distances would be expressed as apparent hypermutability or redundancy of the variable DNA segment. The constant gene might comprise four sequences coding for the three homology domains and the hinge, separated by intervening sequences. A strong preference for shortrange transposition on the same chromosome and immobilization of the controlling element in the end might account for allelic exclusion.
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