PMID- 22776353 OWN - NLM STAT- MEDLINE DCOM- 20121120 LR - 20131121 IS - 1365-3156 (Electronic) IS - 1360-2276 (Linking) VI - 17 IP - 9 DP - 2012 Sep TI - Rapid identification of Leishmania spp. in formalin-fixed, paraffin-embedded tissue samples by fluorescence in situ hybridization. PG - 1117-26 LID - 10.1111/j.1365-3156.2012.03024.x [doi] AB - OBJECTIVE: To describe and validate fluorescence in situ hybridization (FISH), a new method of Leishmania spp. identification. FISH allows for a rapid detection of target organisms by specific binding of fluorescently labelled oligonucleotide probes to ribosomal RNA. METHODS: Two genus-specific, fluorescently labelled Leishmania spp. FISH probes were designed and evaluated with a panel of 18 Leishmania spp. and six Trypanosoma spp. including well-defined strains and clinical isolates. In addition, the FISH probes were tested in comparison with Giemsa staining in formalin-fixed, paraffin-embedded tissues of five mice that had been artificially infected with Leishmania major strains, leading to concordant results. Finally, 11 tissue samples of patients with cutaneous leishmaniasis, four tissue samples of patients with visceral leishmaniasis, and one native bone marrow sample of a patient with visceral leishmaniasis were analysed with FISH and Giemsa staining. RESULTS: Concordant results were achieved by FISH and Giemsa staining in 15/16 specimens. CONCLUSION: This analysis provides proof of principle that FISH is a suitable method for the rapid and easy detection of Leishmania spp. in formalin-fixed, paraffin-embedded tissue samples. Because of the good contrast of Leishmania spp. in tissue, FISH facilitates the identification of these organisms in tissue samples even by less experienced investigators. CI - (c) 2012 Blackwell Publishing Ltd. FAU - Frickmann, Hagen AU - Frickmann H AD - Department for Tropical Medicine at the Bernhard Nocht Institute, German Armed Forces Hospital Hamburg, Hamburg, Germany. frickmann@bni-hamburg.de FAU - Alnamar, Yaser AU - Alnamar Y FAU - Essig, Andreas AU - Essig A FAU - Clos, Joachim AU - Clos J FAU - Racz, Paul AU - Racz P FAU - Barth, Thomas F AU - Barth TF FAU - Hagen, Ralf M AU - Hagen RM FAU - Fischer, Marcellus AU - Fischer M FAU - Poppert, Sven AU - Poppert S LA - eng PT - Journal Article DEP - 20120709 PL - England TA - Trop Med Int Health JT - Tropical medicine & international health : TM & IH JID - 9610576 RN - 0 (RNA, Protozoan) RN - 1HG84L3525 (Formaldehyde) SB - IM MH - Animals MH - *Formaldehyde MH - Humans MH - In Situ Hybridization, Fluorescence/*methods MH - Leishmania/*classification MH - Leishmaniasis/*diagnosis/parasitology MH - Mice MH - Paraffin Embedding/*methods MH - RNA, Protozoan MH - Sequence Analysis, RNA MH - Time Factors MH - Trypanosoma/classification EDAT- 2012/07/11 06:00 MHDA- 2012/12/10 06:00 CRDT- 2012/07/11 06:00 PHST- 2012/07/11 06:00 [entrez] PHST- 2012/07/11 06:00 [pubmed] PHST- 2012/12/10 06:00 [medline] AID - 10.1111/j.1365-3156.2012.03024.x [doi] PST - ppublish SO - Trop Med Int Health. 2012 Sep;17(9):1117-26. doi: 10.1111/j.1365-3156.2012.03024.x. Epub 2012 Jul 9.