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Applied and Environmental Microbiology, September 1999, p. 4264-4267, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Identification of Lactobacillus Isolates
from the Gastrointestinal Tract, Silage, and Yoghurt by 16S-23S rRNA
Gene Intergenic Spacer Region Sequence Comparisons
G. W.
Tannock,1,*
A.
Tilsala-Timisjarvi,2
S.
Rodtong,3
J.
Ng,1
K.
Munro,1 and
T.
Alatossava2,4
Department of Microbiology, University of
Otago, Dunedin, New Zealand1; Department
of Biology, University of Oulu, Oulu,2 and
Biotechnology Laboratory, REDEC of Kajaani, University of Oulu,
Sotkamo,4 Finland; and School of
Microbiology, Suranaree University of Technology, Nakhon Ratchasima,
Thailand3
Received 16 February 1999/Accepted 1 July 1999
Lactobacillus isolates were identified by PCR
amplification and sequencing of the region between the 16S and 23S rRNA
genes (spacer region). The sequences obtained from the isolates were compared to those of reference strains held in GenBank. A similarity of
97.5% or greater was considered to provide identification. To check
the reliability of the method, the V2-V3 region of the 16S rRNA gene
was amplified and sequenced in the case of isolates whose spacer region
sequences were less than 99% similar to that of a reference strain.
Confirmation of identity was obtained in all instances. Spacer region
sequencing provided rapid and accurate identification of
Lactobacillus isolates obtained from gastrointestinal, yoghurt, and silage samples. It had an advantage over 16S V2-V3 sequence comparisons because it distinguished between isolates of
Lactobacillus casei and Lactobacillus
rhamnosus.
*
Corresponding author. Mailing address: Department of
Microbiology, University of Otago, P.O. Box 56, Dunedin, New Zealand. Phone: 64-3-479-7713. Fax: 64-3-479-8540. E-mail:
gerald.tannock{at}stonebow.otago.ac.nz.
Applied and Environmental Microbiology, September 1999, p. 4264-4267, Vol. 65, No. 9
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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