Differential Fluorescence of Sister Chromatids in Chicken Embryos Exposed to 5-bromodeoxyuridine

Overview

Journal Chromosoma

Specialty Molecular Biology

Date 1975 Jul 21

PMID 1149577

Citations 13

Authors

S E Bloom

T C Hsu

Affiliations

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Abstract

Differential fluorescence of sister chromatids (SCD) and sister chromatid exchanges (SCE) were visualized in chromosomes obtained directly from growing chicken embryos. SCD was obtained by exposing 3-day embryos to BrdU (12.5-50 mug) in ovo for 26 hours and staining air dried chromosome preparations with 33258 Hoechst. Bright, stable fluorescence and continued SCD were achieved if slides were mounted in McIlvaine's pH 4.4 buffer. Embryo growth, mitotic activity and gross chromosome morphology were not adversely altered by the BrdU treatments. The SCE rate was estimated to be 0.07 SCEs per macrochromosome and 0.75 SCEs per metaphase for two cell cycles.

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