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  • Direct Visualization of the Multicopy Chromosomes in Cyanobacterium Synechococcus elongatus PCC 7942.

Direct Visualization of the Multicopy Chromosomes in Cyanobacterium Synechococcus elongatus PCC 7942.

Bio-protocol (2018-08-05)
Ryudo Ohbayashi, Hirofumi Yoshikawa, Satoru Watanabe
ABSTRACT

Cyanobacteria are prokaryotic organisms that carry out oxygenic photosynthesis. The fresh water cyanobacterium Synechococcus elongatus PCC 7942 is a model organism for the study of photosynthesis and gene regulation, and for biotechnological applications. Besides several freshwater cyanobacteria, S. elongatus 7942 also contains multiple chromosomal copies per cell at all stages of its cell cycle. Here, we describe a method for the direct visualization of multicopy chromosomes in S. elongatus 7942 by fluorescence in situ hybridization (FISH).

MATERIALS
Product Number
Brand
Product Description

Roche
Fluorescein-12-UTP, ≥85% (HPLC), solution
Roche
Random Primed DNA Labeling Kit
Sigma-Aldrich
Phosphate buffered saline, powder, pH 7.4, for preparing 1 L solutions
Roche
DNA, MB-grade, from fish sperm
Roche
Glycogen, from mussels