PCR fingerprinting discriminating between Candida albicans and Candida dubliniensis / 中华传染病杂志

ABSTRACT

Objective To develop a rapid PCR fingerprinting for discriminating between Candida albicans and Candida dubliniensis isolates. Methods Genomic DNA purified from the two species was amplified by single primer PCR. Oligonucleotide of the minisatellite-specific core sequence of the wild-type phage M13 (5′-GAGGGTGGCGGTTCT-3′) was used as primer and the amplified products were analyzed by gel electrophoresis and microfluidic DNA chip assays. Results Of 17 candida isolates, the PCR fingerprinting generated five strain-specific bands for C. albicans and C. dubliniensis respectively, allowing identification to species level between them. The other bands were minor different in their species. By microfluidic DNA chip, the DNA fragments in size of amplified products for the C. dubliniensis were 960,1177,1297,1495,1797 bp and for the C. albicans 653,1323,1531,2021,2875 bp. Conclusions C. albicans and C. dubliniensis have distinguishable pattern by PCR fingerprinting using the single primer. The microfluidic DNA chip is proposed here as a simple, rapid and highly reproducible tool, especially for the epidemiological investigation.