Implications of multiple freeze-thawing on respiratory samples for culture-independent analyses.

ABSTRACT:

Background

Best practice when performing culture-independent microbiological analysis of sputum samples involves their rapid freezing and storage at -80°C. However, accessing biobanked collections can mean that material has been passed through repeated freeze-thaw cycles. The aim of this study was to determine the impact of these cycles on microbial community profiles.

Methods

Sputum was collected from eight adults with cystic fibrosis, and each sample was subjected to six freeze-thaw cycles. Following each cycle, an aliquot was removed and treated with propidium monoazide (PMA) prior to DNA extraction and 16S rRNA gene pyrosequencing.

Results

The impact of freeze-thaw cycles was greatest on rare members of the microbiota, with variation beyond that detected with with

SUBMITTER: Cuthbertson L 

PROVIDER: S-EPMC4793934 | biostudies-literature | 2015 Jul

REPOSITORIES: biostudies-literature