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Journal of Clinical Microbiology, April 1998, p. 902-907, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Group A Streptococcal Vir Types Are M-Protein Gene
(emm) Sequence Type Specific
Don L.
Gardiner,1,*
Alison M.
Goodfellow,1
Diana R.
Martin,2 and
Kadaba S.
Sriprakash1
Menzies School of Health Research, Darwin,
Australia,1 and
ESR, Communicable
Disease Centre, Porirua, New Zealand2
Received 10 September 1997/Returned for modification 16 October
1997/Accepted 14 December 1997
The M-protein genes (emm genes) of 103 separate
impetiginous Streptococcus pyogenes isolates were sequenced
and the sequence types were compared to the types obtained by Vir
typing. Vir typing is based on restriction fragment length polymorphism
(RFLP) analysis of a 4- to 7-kb pathogenicity island encoding
emm and other virulence genes. By using both
HaeIII and HinfI to generate RFLP profiles, complete concordance between Vir type and emm sequence type
was found. Comparison of the emm sequences with those in
GenBank revealed new sequence types sharing less than 90% identity
with known types. Diversity in the emm sequence was
generated by corrected frameshift mutations, point mutations, and small
in-frame mutations.
*
Corresponding author. Mailing address: Menzies School
of Health Research, Combined Health Building, Building 58, Royal Darwin Hospital, Rocklands Dr., Tiwi 0812, Northern Territory, Australia. Phone: 61-8-89228006. Fax: 61-8-89275187. E-mail
don{at}menzies.su.edu.au.
Journal of Clinical Microbiology, April 1998, p. 902-907, Vol. 36, No. 4
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
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