Inhibition of condensation in the late-replicating X chromosome induced by 5-azadeoxycytidine in human lymphocyte cultures |
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Authors: | T. Haaf G. Ott M. Schmid |
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Affiliation: | (1) Institut für Humangenetik der Universität, Koellikerstrasse 2, D-8700 Würzburg, Germany |
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Abstract: | Summary The cytidine analogue 5-azadeoxycytidine (5-aza-dC) induces a very distinct inhibition of condensation in the genetically inactive, late-replicating X chromosome (XL) when applied to human lymphocyte cultures. One of the two X chromosomes in cytogenetically normal female cells becomes dramatically longer than its homologous partner. The highest rate of metaphases with an undercondensed XL chromosome is achieved when 5-aza-dC is added at a final concentration of 10-5M 2 h before cell harvesting. The interactions between 5-aza-dC and chromosomal DNA as well as the factors involved in X chromosome inactivation are discussed. |
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