Molecular epidemiology of Cryptococcus neoformans and Cryptococcus gattii in China between 2007 and 2013 using multilocus sequence typing and the DiversiLab system

Article

Abstract

The purpose of this study was to investigate the molecular characteristics of 83 clinical Cryptococcus neoformans/C. gattii species complex isolated in Beijing, China, between 2007 and 2013. Restriction fragment length polymorphism of the gene URA5 (URA5-RFLP), multilocus sequence typing (MLST), and automated repetitive polymerase chain reaction (rep-PCR; DiversiLab system) were performed to genotype these cryptococcal isolates. There was an excellent correlation amongst the three methods; however, PU157 was assigned as VNII according to URA5-RFLP, while it was classified as VNI by the DiversiLab system analysis. PU157 was finally identified as VNB by seven-locus MLST analysis. Moreover, though AD hybrids could not be processed by MLST, ideal results could be obtained by the DiversiLab system. The genotype VNI accounted for 95.2 % (79/83) of isolates. Besides one strain of VNB, VNIII, and VGI each, a strain of VGII was detected in our study, which was isolated from a patient from the temperate region in North China. In addition, the most common MLST sequence type (ST) was ST5, accounting for 91.6 % (76/83), followed by ST31, ST63, ST182, ST295, ST296, and ST332. ST295, ST296, and ST332 were new STs. Except for isolate PU157 (VNB), identical results were obtained quickly and accurately through the DiversiLab system compared to MLST and URA5-RFLP. The discovery of VNB and VGII in the temperate climate regions of China suggested that the population structure of C. neoformans and C. gattii should be explored more extensively. Our results also showed that the DiversiLab system can be used in the genotyping of C. neoformans and C. gattii.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of Clinical Laboratory, Peking Union Medical College Hospital, Peking Union Medical CollegeChinese Academy of Medical SciencesBeijingChina
  2. 2.Department of Clinical Laboratory, Beijing Di-Tan HospitalCapital Medical UniversityBeijingChina
  3. 3.Department of Infectious Diseases, Peking Union Medical College Hospital, Peking Union Medical CollegeChinese Academy of Medical SciencesBeijingChina

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