In Vivo BrdU-33258 Hoechst Analysis of DNA Replication Kinetics and Sister Chromatid Exchange Formation in Mouse Somatic and Meiotic Cells

Overview

Journal Chromosoma

Specialty Molecular Biology

Date 1976 Nov 29

PMID 63363

Citations 21

Authors

J W Allen

S A LATT

Affiliations

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Abstract

BrdU (5-bromodeoxyuridine)-33258 Hoechst methods have been adapted for in vivo analyses of replication kinetics, sister chromatid differentiation and sister chromatid exchange (SCE) formation in mice. Sufficient in vivo BrdU substitution for cytological detection was effected with multiple intraperitoneal injections of the analogue. The combination of centromere staining asymmetry and sister chromatid differentiation at metaphase permits unambiguous determination of the number of replications in BrdU and dT (deoxythymidine) undergone by individual cells. Late-replicating regions in marrow and spermatogonial chromosomes are highlighted by bright fluorescence after sequential incorporation of BrdU followed by dT during a single DNA synthesis period. SCEs are analyzed in marrow and spermatogonial metaphases after successive complete cycles of BrdU and dT incorporation. Significant induction of SCE was observed with both mitomycin C and cyclophosphamide; the latter drug requires host-mediated activation to be effective. In meiotic metaphase cells harvested two weeks after BrdU incorporation, satellite DNA asymmetry, sister chromatid differentiation and SCE could be detected in a few chromosomes, most frequently the X and the Y.

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