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Journal of Clinical Microbiology, November 1998, p. 3378-3381, Vol. 36, No. 11
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Sequence Variation in the Small-Subunit rRNA Gene of Plasmodium malariae and Prevalence of Isolates with the Variant Sequence in Sichuan, China

Qing Liu,1,2 Shenghua Zhu,2 Sahoko Mizuno,1 Masatsugu Kimura,3 Peina Liu,2 Shin Isomura,1 Xingzhen Wang,2 and Fumihiko Kawamoto1,*

Department of International Health, Nagoya University School of Medicine, Nagoya 466-8550,1 and Laboratory of Biophysics, Osaka City University Medical School, Osaka 545-0051,3 Japan, and Department of Parasitology, West China University of Medical Sciences, Chengdu 610041, Sichuan, China2

Received 6 April 1998/Returned for modification 8 June 1998/Accepted 11 August 1998

By two PCR-based diagnostic methods, Plasmodium malariae infections have been rediscovered at two foci in the Sichuan province of China, a region where no cases of P. malariae have been officially reported for the last 2 decades. In addition, a variant form of P. malariae which has a deletion of 19 bp and seven substitutions of base pairs in the target sequence of the small-subunit (SSU) rRNA gene was detected with high frequency. Alignment analysis of Plasmodium sp. SSU rRNA gene sequences revealed that the 5' region of the variant sequence is identical to that of P. vivax or P. knowlesi and its 3' region is identical to that of P. malariae. The same sequence variations were also found in P. malariae isolates collected along the Thai-Myanmar border, suggesting a wide distribution of this variant form from southern China to Southeast Asia.

* Corresponding author. Mailing address: Department of International Health, Nagoya University School of Medicine, Nagoya 466-8550, Japan. Phone: 81-(52)-744-2113. Fax: 81-(52)-744-2114. E-mail: hiko{at}med.nagoya-u.ac.jp.

Journal of Clinical Microbiology, November 1998, p. 3378-3381, Vol. 36, No. 11
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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