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Antimicrobial Agents and Chemotherapy, November 2004, p. 4447-4449, Vol. 48, No. 11
0066-4804/04/$08.00+0 DOI: 10.1128/AAC.48.11.4447-4449.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
Novel Mutations within the embB Gene in Ethambutol-Susceptible Clinical Isolates of Mycobacterium tuberculosis
Ann S. G. Lee,1*
Siti Noor Khadijah Othman,1
Yu Min Ho,1 and
Sin Yew Wong2
Division of Medical Sciences, National Cancer Centre,1
Department of Infectious Diseases, Tan Tock Seng Hospital, Singapore, Singapore2
Received 30 March 2004/
Returned for modification 10 May 2004/
Accepted 15 July 2004
Genetic analysis of the embB gene revealed mutations in 17 (68%) of 25 ethambutol (EMB) resistant isolates (M306I, M306V, M306L, Q497R) but also in 4 (20%) of 20 EMB-susceptible isolates of Mycobacterium tuberculosis, namely, an ATG
ATM substitution resulting in M306I, G406N, and the novel alterations M423I and A659T.
* Corresponding author. Mailing address: Division of Medical Sciences, National Cancer Centre, Singapore 169610, Republic of Singapore. Phone: 65 6436 8313. Fax: 65 6372 0161. E-mail:
dmslsg{at}nccs.com.sg.
Antimicrobial Agents and Chemotherapy, November 2004, p. 4447-4449, Vol. 48, No. 11
0066-4804/04/$08.00+0 DOI: 10.1128/AAC.48.11.4447-4449.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.
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