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Draft genome of a commonly misdiagnosed multidrug resistant pathogen Candida auris

Chatterjee, Sharanya and Alampalli, Shuba Varshini and Nageshan, Rishi Kumar and Chettiar, Sivarajan T and Joshi, Sangeeta and Tatu, Utpal S (2015) Draft genome of a commonly misdiagnosed multidrug resistant pathogen Candida auris. In: BMC GENOMICS, 16 .

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Official URL: http://dx.doi.org/10.1186/s12864-015-1863-z

Abstract

Background: Candida auris is a multidrug resistant, emerging agent of fungemia in humans. Its actual global distribution remains obscure as the current commercial methods of clinical diagnosis misidentify it as C. haemulonii. Here we report the first draft genome of C. auris to explore the genomic basis of virulence and unique differences that could be employed for differential diagnosis. Results: More than 99.5 % of the C. auris genomic reads did not align to the current whole (or draft) genome sequences of Candida albicans, Candida lusitaniae, Candida glabrata and Saccharomyces cerevisiae; thereby indicating its divergence from the active Candida clade. The genome spans around 12.49 Mb with 8527 predicted genes. Functional annotation revealed that among the sequenced Candida species, it is closest to the hemiascomycete species Clavispora lusitaniae. Comparison with the well-studied species Candida albicans showed that it shares significant virulence attributes with other pathogenic Candida species such as oligopeptide transporters, mannosyl transfersases, secreted proteases and genes involved in biofilm formation. We also identified a plethora of transporters belonging to the ABC and major facilitator superfamily along with known MDR transcription factors which explained its high tolerance to antifungal drugs. Conclusions: Our study emphasizes an urgent need for accurate fungal screening methods such as PCR and electrophoretic karyotyping to ensure proper management of fungemia. Our work highlights the potential genetic mechanisms involved in virulence and pathogenicity of an important emerging human pathogen namely C. auris. Owing to its diversity at the genomic scale; we expect the genome sequence to be a useful resource to map species specific differences that will help develop accurate diagnostic markers and better drug targets.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the BIOMED CENTRAL LTD, 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND
Keywords: Nosocomial infections; Drug resistance; Virulence; Fungemia; Misdiagnosis; Candida haemulonii; Next Generation Sequencing (NGS)
Department/Centre: Division of Biological Sciences > Biochemistry
Depositing User: Id for Latest eprints
Date Deposited: 01 Oct 2015 04:34
Last Modified: 01 Oct 2015 04:34
URI: http://eprints.iisc.ac.in/id/eprint/52473

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