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Original Articles

DNA-based detection of the fungal pathogen Geomyces destructans in soils from bat hibernacula

, , , , , & show all
Pages 241-246
Received 29 Aug 2010
Accepted 26 Sep 2010
Published online: 20 Jan 2017
 

White-nose syndrome (WNS) is an emerging disease causing unprecedented morbidity and mortality among bats in eastern North America. The disease is characterized by cutaneous infection of hibernating bats by the psychrophilic fungus Geomyces destructans. Detection of G. destructans in environments occupied by bats will be critical for WNS surveillance, management and characterization of the fungal lifecycle. We initiated an rRNA gene region-based molecular survey to characterize the distribution of G. destructans in soil samples collected from bat hibernacula in the eastern United States with an existing PCR test. Although this test did not specifically detect G. destructans in soil samples based on a presence/absence metric, it did favor amplification of DNA from putative Geomyces species. Cloning and sequencing of PCR products amplified from 24 soil samples revealed 74 unique sequence variants representing 12 clades. Clones with exact sequence matches to G. destructans were identified in three of 19 soil samples from hibernacula in states where WNS is known to occur. Geomyces destructans was not identified in an additional five samples collected outside the region where WNS has been documented. This study highlights the diversity of putative Geomyces spp. in soil from bat hibernacula and indicates that further research is needed to better define the taxonomy of this genus and to develop enhanced diagnostic tests for rapid and specific detection of G. destructans in environmental samples.

The authors thank Peter Youngbaer (NSS), Mike Warner (Speleobooks Inc.) and Alan Hicks (NY DEC) for their assistance in coordinating collection of samples and the many individuals who volunteered to collect samples for this project. We thank Kyah Norton (CFMR) for her assistance with PCR, cloning and sequencing of DNA and are indebted to Paul Cryan (USGS-FORT) for helpful suggestions during the preparation of this manuscript and for his assistance in creating Fig. 1. We also thank LeAnn White (USGS-NWHC) and two anonymous reviewers for their thoughtful comments on this manuscript. Financial support for this project was provided to DSB and THK by the National Speleological Society and to DSB by US Fish and Wildlife Service intergovernmental agreement 501819H057. Use of trade, product or firm names is for descriptive purposes only and does not imply endorsement by the US government.

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