An alternative efficient procedure for purification of the obligate intracellular fish bacterial pathogen Piscirickettsia salmonis.

Abstract:

:Piscirickettsia salmonis is an obligate intracellular bacterial pathogen of salmonid fish and the etiological agent of the aggressive disease salmonid rickettsial syndrome. Today, this disease, also known as piscirickettsiosis, is the cause of high mortality in net pen-reared salmonids in southern Chile. Although the bacteria can be grown in tissue culture cells, genetic analysis of the organism has been hindered because of the difficulty in obtaining P. salmonis DNA free from contaminating host cell DNA. In this report, we describe a novel procedure to purify in vitro-grown bacteria with iodixanol as the substrate to run differential centrifugation gradients which, combined with DNase I digestion, yield enough pure bacteria to do DNA analysis. The efficiency of the purification procedure relies on two main issues: semiquantitative synchrony of the P. salmonis-infected Chinook salmon embryo (CHSE-214) tissue culture cells and low osmolarity of iodixanol to better resolve bacteria from the membranous structures of the host cell. This method resulted in the isolation of intact piscirickettsia organisms and removed salmon and mitochondrial DNA effectively, with only 1.0% contamination with the latter.

journal_name

Appl Environ Microbiol

authors

Henríquez V,Rojas MV,Marshall SH

doi

10.1128/aem.69.10.6268-6271.2003

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

6268-71

issue

10

eissn

0099-2240

issn

1098-5336

journal_volume

69

pub_type

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