Summary
Late 3H-thymidine incorporation patterns and quinacrine fluorescence banding patterns were analyzed in metaphase chromosomes prepared from human blood cultures. In general, late-labeling regions correspond to the strongly fluorescent bands in the chromosomes. However, the dully fluorescent secondary constrictions of the chromosomes Nos. 1, 9 and 16 may show late replication in some instances. In contrast, the brilliantly fluorescent distal part of the Y chromosome is not labeled during the latest phase of the DNA replication. In the male X and in the isopycnotic X of the female the labeling pattern also agrees with the quinacrine fluorescence banding. The heteropycnotic X of the female is still more strikingly late-labeling. However, the pattern of its late replication agrees also with the quinacrine fluorescence bands.
Zusammenfassung
An aus menschlichen Blutkulturen gewonnenen Chromosomenpräparaten wurden vergleichende Untersuchungen über die späten Replikationsmuster (mittels 3H-Thymidin-Autoradiographie) und die Quinacrin-Fluorescenz-Bänderungsmuster durchgeführt. Im allgemeinen stimmen die spät replizierenden Abschnitte mit den intensiv fluorescierenden Regionen der Chromosomen überein. Allerdings können die nur schwach fluorescierenden sekundären Constrictionen der Chromosomen Nr. 1, 9 und 16 manchmal auch eine späte Replikation zeigen. Auf der anderen Seite wird der stark fluorescierende Abschnitt des Y-Chromosoms in den letzten Phasen der DNS-Replikation nicht mehr markiert. Beim X-Chromosom des Mannes und beim isopyknotischen X der Frau wird ebenfalls eine Übereinstimmung des Spät-Replikationsmusters und der Quinacrin-Bänderung gefunden. Das heteropyknotische X der Frau zeigt eine noch deutlichere Spät-Replikation; das Muster der Silberkörner stimmt aber ebenfalls mit den Quinacrine-Bändern überein.
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This study was supported by the österreichischen Fonds zur Förderung der Wissenschaftlichen Forschung.
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Calderon, D., Schnedl, W. A comparison between quinacrine fluorescence banding and 3H-thymidine incorporation patterns in human chromosomes. Hum Genet 18, 63–70 (1973). https://doi.org/10.1007/BF00279032
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DOI: https://doi.org/10.1007/BF00279032