On the Mechanism of Differential Giemsa Staining of Bromodeoxyuridine-substituted Chromosomes. II. Differences Between the Demonstration of Sister Chromatid Differentiation and Replication Patterns

Overview

Journal Hum Genet

Specialty Genetics

Date 1985 Jan 1

PMID 2408987

Citations 27

Authors

G Speit

S Haupter

Affiliations

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Abstract

Experiments were performed to find out whether different mechanisms are involved in FPG-(fluorescent plus Giemsa) staining for the demonstration of replication patterns and sister chromatid differentiation (SCD) after bromodeoxyuridine (BrdU)-substitution of V79 Chinese hamster chromosomes. The influence of variations of the staining procedure on the quality of both SCD and replication patterns was comparatively investigated and differences in the demonstration of these two phenomena within the same chromosome were studied using various BrdU-labeling protocols. The results show that at least graduated differences exist. For a good differentiation of replication patterns a stronger FPG-treatment is necessary than it is for SCD. Partial BrdU substitution only leads to replication patterns in the next mitosis. A further round of replication either in the presence or absence of BrdU causes a reduced staining of the complete chromatid and three-way differentiation is seen in third generation mitoses. These results support the view that alterations of chromosomal proteins during BrdU-incorporation and replication of BrdU-substituted DNA are decisive for differential staining.

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