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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 34 (1976), S. 171-174 
    ISSN: 1432-0533
    Keywords: Brain tumor ; Meningiomas ; Papova-Virus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Human meningiomas show characteristic chromosome aberrations very similar to those reported in human cell cultures experimentally transformed by Simian virus 40 (SV 40). Three out of eight meningiomas tested showed SV 40 specific tumor antigen but no virus capsid antigen. Experiments to rescue virus were successfully performed. Electron microscopic studies of these cell cultures revealed cytoplasmic inclusions containing virus particles which corresponded in size and morphology to Papova viruses.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Es wird über einen neuen Fall einer X/Autosom-Translokation beim Mann berichtet. Azoospermie und Klinefelter-ähnliche Stigmata können unmittelbar auf die balancierte Translokation zurückgeführt werden oder Folge einer durch die Translokation gestörten X-chromosomalen Inaktivierung während der Spermiogenese sein.
    Notes: Summary A new case of X/autosome translocation in a male patient is described. Azoospermia and Klinefelter like stigmata can be explained as a consequence of the balanced translocation, or by disturbed X-chromosomal inactivation during spermiogenesis.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 52 (1979), S. 119-125 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The pattern of association of acrocentric chromosomes was examined in ten and five carriers of a 15/21 and a 13/14 Robertsonian translocation, respectively, and was compared with that of the same numbers of relatives with normal karyotypes. In the carriers of 15/21 translocation, the number of large associations (involving more than two acrocentrics) and the association frequencies for individual acrocentric chromosomes, were significantly higher than in the control group. The mean number of associations of the single homologs of the translocation chromosomes was much higher than that of the other acrocentrics. In the carriers of 13/14 translocations, only the association frequency for chromosome 13 was higher than in the normal relatives. The uninvolved chromosomes homologous to those involved in translocations showed an insignificant increase in associations in comparison with the other acrocentrics. These results suggest that some mechanism within the cells compensates for the effect of missing acrocentrics or of acrocentrics lacking NORs on the number of associations. The possible relations of this phenomenon to the activity of the nucleolus organizing regions are discussed.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The suppression of proliferation of maternal lymphocytes by the lymphocytes of their own male newborns have been tested in a PHA-induced two-way stimulation system. The mixed lymphocyte cultures of 6 out of 12 such mother/son pairs had 23–50% metaphases with 46,XX karyotype. In 2 more cases 10% maternal metaphases have been observed. Hence, it appears that fetal lymphocytes are unable to suppress the proliferation of maternal cells completely.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 40 (1978), S. 149-155 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The association pattern was studied in 2715 mitoses of 90 meningiomas with different numbers of acrocentric chromosomes. In cells with monosomy 22, a significant increase of mitoses with associations was observed in comparison to cells with a normal karyotype. The number of associating acrocentric chromosomes was highly significantly increased. This surplus was not only caused by a highly significant increase of associating G chromosomes but also of D chromosomes. The loss of further acrocentric chromosomes had no significant influence on the number of mitoses with associations or the number of associating chromosomes. Based on the well-known correlations between the nucleolus organization and the association pattern, the results seem to indicate a compensation mechanism among the nucleoles organizing regions (NOR's) which keeps the supply of nucleolar material constant and simultaneously causes a higher association tendency between the remaining acrocentric chromosomes. The increase of associations in the 22 monosomic cells was interpreted as a overcompensation after the loss of only one NOR.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 26 (1975), S. 207-214 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A non-mongoloid boy born to a mongoloid mother is described. He showed aplasia of the left 5th finger and some clinical and dermatoglyphic features frequently found in Down's syndrome. Chromosome analysis revealed few hyperdiploid but no G-trisomic cells. An undetected G-trisomy mosaic, or a mechanism of extrachromosomal inheritance, and an embryonic development in a pathological milieu are discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 27 (1975), S. 119-128 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Unter 88 cytogenetisch untersuchten Meningeomen von Frauen wurden 12 Tumoren gefunden, bei denen außer dem für Meningeome typischen Verlust eines Chromosoms 22 auch ein oder mehrere Chromosomen der C-Gruppe verlorengegangen waren. Bei 8 dieser Tumoren konnte in Gewebekulturpräparaten nur in weniger als 8% der untersuchten Zellen Barr-body-ähnliche Kernstrukturen nachgewiesen werden, bei einem Tumor fanden sich 12% und bei 3 über 20% Barr-bodies. Auf Grund von Vergleichsuntersuchungen wurden 8 Tumoren als geschlechtschromatinnegativ, 1 Tumor als teilweise positiv und die übrigen 3 als eindeutig positiv eingestuft. Bei einem Meningeom konnte das Fehlen eines X-Chromosoms direkt mit der Giemsa-Bandentechnik nachgewiesen werden. Bei 6 von 24 Meningeomen männlicher Herkunft konnte auf Grund der Chromosomenmorphologie und des Assoziationsverhaltens sehr wahrscheinlich gemacht werden, daß außer dem Chromosom 22 auch das Y-Chromosom verlorengegangen war. Bei 4 dieser Tumoren konnte eine Fluorescenzfärbung durchgeführt werden, wobei das Fehlen einer Y-Fluorescenz in Interphasezellen und Metaphaseplatten nachweisbar war. Diese Befunde werden im Zusammenhang mit dem Geschlechtschromosomenverlust bei anderen menschlichen Tumoren und im hohen Lebensalter diskutiert.
    Notes: Summary Twelve out of 88 cytogenetically examined meningiomas of female patients showed, in addition to the typical loss of a chromosome 22, a loss of 1 or more chromosomes of group C. Among them 8 tumors had less than 8% cells with Barr-body-like particles, whereas in one tumor 12% and in 3 others over 20% Barr bodies were found, which, based on control studies, were classified as sex-chromatin negative, partly positive, and positive, respectively. In one case the loss of an X chromosome was verified by Giemsa banding. In 6 out of 24 meningiomas of male origin, the chromosoma. morphology and association pattern strongly indicated that besides the loss of a chromosome 22, the Y chromosome was also missing. Moreover, the loss of the male sex chromosome could be ascertained in 4 tumors by the conspicuous absence of Y fluorescence in interphase nuclei and in metaphase plates after fluorescence staining. The findings are discussed in connection with the gonosomal loss in other human tumors and in old age.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 30 (1975), S. 343-348 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Die erst kürzlich entdeckten reziproken Translokationen bei der chronisch myeloischen Leukämie (CML) und beim Burkitt-Lymphom (BL) machten es notwendig zu überprüfen, ob beim Meningeom tatsächlich die beschriebene Monosomie 22 oder ebenfalls eine Translokation vorliegt. In 10 von 12 Meningeomen konnte eine partielle oder totale Translokation des fehlenden Chromosoms 22 auf ein anderes Chromosom durch die Analyse der Fluorescenzbanden ausgeschlossen werden. 2 Meningeome zeigten Markerchromosomen von so komplexer Zusammensetzung, daß es nicht möglich war zu entscheiden, ob eine 22-Translokation vorliegt oder nicht. Aus den Ergebnissen wird geschlossen, daß Meningeomzellen, im Gegensatz zu CML und BL, fast regelmäßig den Verlust eines definierten Teils ihres Genoms aufweisen.
    Notes: Summary The recently detected reciprocal translocations in chronic myeloic leucemia (CML) and Burkitt's lymphoma (BL) made it necessary to clarify if meningiomas really show the described monosomy 22 or also a translocation. In 10 out of 12 meningiomas a total or partial translocation of the missing chromosome 22 to another chromosome could be ruled out by fluorescence banding analysis. Two meningiomas showed marker chromosomes of such a complex composition that it was impossible to decide if a 22 translocation was present or not. From these results it was concluded that meningioma cells, in contrast to CML and BL, show almost regularly a loss of a definitive part of their genome.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 49 (1979), S. 185-189 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The association pattern was studied in 1182 mitoses of 21 patients with trisomy 13 and in a control group. In addition, 173 trisomic mitoses were compared with the same number of diploid mitoses in a case of mosaicism. The number of mitoses with associations was no higher in the trisomic cells than in cells with normal karyotypes. Some differences were observed in the frequency of associations per cell and of the types of associations in the patient group and in the trisomic cells of the mosaic case. The number of associations in which more than two acrocentric chromosomes were involved was unexpectedly low in the cells with a supernumerary chromosome 13. The result are interpreted as suggesting the existence of a compensatory mechanism activated by the additional acrocentric chromosome.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    European journal of pediatrics 118 (1975), S. 303-313 
    ISSN: 1432-1076
    Keywords: Cyproheptadin ; Nuran® ; Human fibroblast cultures ; Chromosome studies ; Cytotoxic effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zellkulturen kindlicher Fibroblasten wurden auf eine chromosomenmutagene Wirkung von Cyproheptadin untersucht. Weder bei 24stündiger Belastung mit Konzentrationen von 16,0 bis 32,0 mg/l Nährmedium noch bei Dauerbelastung mit einer Konzentration von 8,0 mg/l über einen Zeitraum von 8 bis 11 Wochen konnte eine Chromosomenmutagenität beobachtet werden. Reversible, cytomorphologische und cytochemische Veränderungen (8,0–16,0 mg/l), verbunden mit einer Zellteilungshemmung (32,0 mg/l) und irreversible Veränderungen mit Zelluntergang bei höchsten Konzentrationen (64,0–128,0 mg/l) werden als unspezifischer cytotoxischer in vitro-Effekt gedeutet.
    Notes: Abstract Cyproheptadin was tested on chromosomes in fibroblast cultures of children for its possible mutagenic efficacy. Neither 24-hour exposure to Cyproheptadin at concentrations of 8–16 mg/l medium nor a chronic exposure for 8–11 weeks at a concentration of 8 mg/l caused any discernable chromosomal mutations. At concentrations between 8–16 mg/l reversible cytomorphological and cytochemical changes occured; 32 mg/l suppressed cell division and higher concentrations (64–128 mg/l) brought about irreversible changes leading to cell death. These reactions were rather in vitro cytotoxic effects of unspecific nature.
    Type of Medium: Electronic Resource
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