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  • 1
    ISSN: 1434-0879
    Keywords: Prostatic carcinoma ; Chromosome 8 ; Androgen ; Chromosome aberrations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The cytogenetic evolution of the prostatic adenocarcinoma cell line LNCaP was investigated during long term in vitro culture. Study of five different sublines demonstrated that the original karyotype was well preserved in all sublines, with respect to the chromosome number as well as to the primary markers. All sublines showed additional, subline specific secondary marker chromosomes. Comparison of these markers in androgen responsive and nonresponsive sublines showed rearrangement of the short arm of chromosome 8 in both unresponsive sublines. The breakpoints were in 8p21 and 8p23, respectively, resulting in deletion of the 8p23→pter region in both sublines. In contrast, the hormone responsive sublines did not show any aberrations in chromosome 8. Review of published karyotypes of patients and cell lines seems to support our finding of partial deletion of 8p in adrogen unresponsive prostate tumor cells.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: AraC and DAC resistance ; dck gene ; Inactivating mutations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The deoxycytidine kinase (dck) gene encodes the enzyme responsible for the metabolic activation of the antileukemic drugs cytosine arabinoside (AraC) and 5-aza-2′-deoxycytidine (decitabine, DAC). Thedck locus was analyzed at the chromosomal and the molecular level in a model of rat leukemic cell lines, in which AraC and DAC resistance was induced, that was marked bydck deficiency. At the chromosomal level, karyotype analysis of metaphase spreads revealed the presence of an aberrant 2q+ chromosome in the AraC-resistant cell line and a (Xq;11q) translocation in its subclone RA/7. The DAC-resistant lines were identical to the parental RCL/O. Fluorescence in situ hybridization on normal rat fibroblast metaphase spreads localized the ratdck gene to chromosome 14q21-q22, a region that was not involved in any of the observed karyotypic aberrations. Analysis at the molecular level revealed an identical rearrangement of thedck gene in the AraC-resistant cell line RCL/A and its subclone RA/7 that resulted in the absence ofdck expression, as assessed by RT-PCR. No genomic rearrangements were observed in a DAC-resistant cell line RCL/D or in its subclone RD/1. However, detection of a single-stranded conformation polymorphism (SSCP) allowed the identification of a single C to G substitution (His to Gln) in thedck cDNA of the DAC-resistant RD/1 clone. The data demonstrate that exposure to AraC and DAC induces a resistant phenotype marked by functionaldck deficiency that may be the consequence of mutations occurring in thedck gene.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0584
    Keywords: Key words AraC and DAC resistance ; dck gene ; Inactivating mutations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The deoxycytidine kinase (dck) gene encodes the enzyme responsible for the metabolic activation of the antileukemic drugs cytosine arabinoside (AraC) and 5-aza-2′-deoxycytidine (decitabine, DAC). The dck locus was analyzed at the chromosomal and the molecular level in a model of rat leukemic cell lines, in which AraC and DAC resistance was induced, that was marked by dck deficiency. At the chromosomal level, karyotype analysis of metaphase spreads revealed the presence of an aberrant 2q+ chromosome in the AraC-resistant cell line and a (Xq;11q) translocation in its subclone RA/7. The DAC-resistant lines were identical to the parental RCL/O. Fluorescence in situ hybridization on normal rat fibroblast metaphase spreads localized the rat dck gene to chromosome 14q21–q22, a region that was not involved in any of the observed karyotypic aberrations. Analysis at the molecular level revealed an identical rearrangement of the dck gene in the AraC-resistant cell line RCL/A and its subclone RA/7 that resulted in the absence of dck expression, as assessed by RT-PCR. No genomic rearrangements were observed in a DAC-resistant cell line RCL/D or in its subclone RD/1. However, detection of a single-stranded conformation polymorphism (SSCP) allowed the identification of a single C to G substitution (His to Gln) in the dck cDNA of the DAC-resistant RD/1 clone. The data demonstrate that exposure to AraC and DAC induces a resistant phenotype marked by functional dck deficiency that may be the consequence of mutations occurring in the dck gene.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-0584
    Keywords: Key words Cold agglutinin syndrome ; Non-Hodgkin's lymphoma ; Trisomy 3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Three cases of low-grade B-cell non-Hodgkin's lymphoma associated with cold agglutinin syndrome, cytogenetically characterized by partial trisomy 3, are presented in this report. Our data suggest that the long arm of chromosome 3 might be of particular importance in the pathogenesis of this subgroup of lymphomas.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Human genetics 〈Berlin〉 15 (1972), S. 126-135 
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Résumé L'existence de deux populations cellulaires, l'une HGPRT+ et l'autre HGPRT- a pu être démontrée en cultures de fibroblastes à partir de biopsies cutanées chez la soeur, la mère et une soeur de la mère d'un patient atteint du syndrome de Lesch-Nyhan. Ce but est aisément atteint en réalisant une sélection biochimique des cellules mutantes par la 8-azaguanine avant l'autoradiographie des cultures incubées avec l'3H-hypoxanthine; parallèlement les cellules normales sont isolées dans le milieu HAT. Ceci nous paraît être une méthode sûre et relativement peu compliquée, de diagnostiquer dans les familles atteintes, les femmes hétérozygotes dont la descendance mâle court un risque important de syndrome de Lesch-Nyhan. C'est précisément le cas de la jeune soeur du patient, dont toute grossesse éventuelle doit être suivie dès le début et exige une détection prénatale de cette affection.
    Abstract: Zusammenfassung Zwei unterschiedliche Zellpopulationen (HGPRT+und HGPRT-) wurden aus den Hautfibroblasten einer Schwester, der Mutter und einer Tante mütterlicherseits eines Patienten mit X-chromosomalem Lesch-Nyhan-Syndrom isoliert. Das Ergebnis wurde mit Hilfe biochemischer Selektion vor der Autoradiographie mit 3H-Hypoxanthin erzielt. Mutierte Zellen wurden in einem Nährmedium mit 8-Azaguanin isoliert, während normale Zellen im HAT-Medium wuchsen. Diese erwies sich als eine einfache und zuverlässige Methode zur Erkennung von weiblichen Heterozygoten in Familien von Patienten mit Lesch-Nyhan-Syndrom. Wegen des hohen Risikos des Auftretens des Syndroms bei männlichen Nachkommen ist die pränatale Diagnostik bei weiblichen Trägern indiziert. In diesem Fall gilt das für die 12jährige Schwester des Probanden.
    Notes: Summary Two distinct cell populations (the first HGPRT+, the other HGPRT-) were isolated in skin fibroblasts cultures from a sister, the mother and a maternal aunt of a patient with Lesch-Nyhan syndrome, an X-linked disorder. This result was achieved by means of a biochemical selection prior to autoradiography with 3H-hypoxanthine. Mutant cells were isolated in a medium containing 8-azaguanine, while normal cells were grown in HAT medium. This proved to be an easy and reliable method for detecting female heterozygotes in families where a patient with Lesch-Nyhan syndrome had been observed. A pre-pregnancy diagnosis of these female carriers is advisable because of the high probability of a full-blown syndrome in their male descendants. This was particularly the case of the 12 years old proband's sister in the family studied here.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1569-8041
    Keywords: IPSS ; myelodysplasia ; prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: In march 1997 an international workshop introduced a new International Prognostic Scoring System (IPSS) for MDS. The goal of the present study was to apply the IPSS to a large group of MDS patients from one centre and to compare it to the FAB-classification. Patients: One hundred eighty-four MDS patients were included on the basis of similar criteria as used by the workshop but some of them (30) received AML-type therapy. Results: The IPSS separated our patients into distinctive prognostic subgroups (P = 0.0001). Median survival was respectively 6.5, 2.6, 1.3 and 0.75 years for the low-risk (22% of patients), the intermediate-1-risk (INT-1) (46%), the intermediate-2-risk (INT-2) (25%) and the high-risk group (7%). The IPSS also discriminated within each of the FAB-categories: RA patients (58 patients) were present in low-risk, INT-1-risk and INT-2-risk subgroups, RARS patients (23) were separated into low-risk and INT-1-risk subgroups. RAEB patients (53) were distributed predominantly between INT-1-risk and INT-2-risk groups, RAEB-t patients (23) between INT-2-risk and high-risk subgroups. CMML patients (27) were present in the low-risk, the INT-1-risk and the INT-2-risk group. Conclusions: Our results confirm the effectiveness of the IPSS in predicting clinical outcome in MDS patients and indicate that it is an improved method compared to the FAB-classification.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1777
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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