Document Detail

Characteristic signatures of the lytA gene provide a basis for rapid and reliable diagnosis of Streptococcus pneumoniae infections.
MedLine Citation:
PMID:  16597847     Owner:  NLM     Status:  MEDLINE    
The nucleotide sequences of the lytA gene from 29 pneumococcal isolates of various serotypes and 22 additional streptococci of the mitis group (including two Streptococcus pseudopneumoniae strains) have been compared and found to correspond to 19 typical (927-bp-long) and 20 atypical (921-bp-long) alleles. All the Streptococcus pneumoniae strains harbored typical lytA alleles, whereas nonpneumococcal isolates belonging to the mitis group always carried atypical alleles. A sequence alignment showed that the main difference between typical and atypical lytA alleles resided in 102 nucleotide positions (including the 6 bp absent from atypical alleles). These nucleotides were perfectly conserved in all the typical alleles studied, and the corresponding nucleotides of the atypical alleles were also perfectly conserved. The presence in these signatures of distinctive restriction sites (namely, SnaBI, XmnI, and BsaAI) allowed the development of a simple, reliable, and fast method that combines PCR amplification of the lytA gene, digestion with BsaAI, and separation of the products by agarose gel electrophoresis. This assay allows the rapid and consistent identification of true S. pneumoniae strains and represents an improved diagnostic tool for the study of pneumococcal carriage.
Daniel Llull; Rubens López; Ernesto García
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of clinical microbiology     Volume:  44     ISSN:  0095-1137     ISO Abbreviation:  J. Clin. Microbiol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2006-04-06     Completed Date:  2006-11-14     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7505564     Medline TA:  J Clin Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1250-6     Citation Subset:  IM    
Departamento de Microbiología Molecular, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu 9, 28040 Madrid, Spain.
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MeSH Terms
DNA, Bacterial / genetics
Genetic Variation*
N-Acetylmuramoyl-L-alanine Amidase / chemistry,  genetics*
Pneumococcal Infections / diagnosis*
Polymerase Chain Reaction
Streptococcus pneumoniae / enzymology,  genetics*,  isolation & purification*
Reg. No./Substance:
0/DNA, Bacterial; EC Amidase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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