A modified fluorescence in situ hybridization protocol for Plasmodium falciparum greatly improves nuclear architecture conservation

A modified fluorescence in situ hybridization protocol for Plasmodium falciparum greatly improves nuclear architecture conservation

Author Contreras-Dominguez, Monica Google Scholar
Moraes, Carolina Borsoi Autor UNIFESP Google Scholar
Dorval, Thierry Google Scholar
Genovesio, Auguste Google Scholar
Dossin, Fernando de Macedo Google Scholar
Freitas-Junior, Lucio H. Google Scholar
Institution Inst Pasteur Korea
Universidade Federal de São Paulo (UNIFESP)
Abstract Fluorescence in situ hybridization (FISH) has been used extensively in the study of nuclear organization and gene positioning in Plasmodium falciparum. While performing FISH with published protocols, we observed large variations in parasite nuclear morphology. We hypothesized that these inconsistencies might be due to the type of parasite preparation prior to FISH, which commonly involves air-drying, prompting us to develop a new fixation protocol. Here we show both qualitatively and quantitatively that compared to air-dried and briefly fixed parasites, longer fixation in suspension leads to improved conservation of nuclear structure and lower intra-population variation of nuclear shape as well as area after FISH development. While the fixation protocol per se does not cause detectable disruptions in nuclear morphology, it greatly influences the conservation of nuclear shape and size during the most stringent steps of FISH. the type of fixation used also influences the detection of telomeric clusters, and we show that the new fixation protocol permits improved conservation of the chromosome end cluster perinuclear distribution and higher colocalization indexes for two adjacent chromosome end probes, Rep20 and telomere. Overall, the results indicate that our alternative protocol dramatically improves conservation of the nuclear architecture compared to previously reported Plasmodium DNA-FISH protocols and highlights the necessity of carefully choosing the fixation protocol for FISH. (C) 2010 Elsevier B.V. All rights reserved.
Keywords Plasmodium falciparum
Fluorescence in situ hybridization
Nuclear organization
Automated image analysis
Language English
Sponsor Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Ministry of Education, Science and Technology (MEST)
Gyeonggi government
Korean Institute of Science and Technology Information (S. Korea)
Grant number FAPESP: 03/12997-8
Date 2010-09-01
Published in Molecular and Biochemical Parasitology. Amsterdam: Elsevier B.V., v. 173, n. 1, p. 48-52, 2010.
ISSN 0166-6851 (Sherpa/Romeo, impact factor)
Publisher Elsevier B.V.
Extent 48-52
Origin http://dx.doi.org/10.1016/j.molbiopara.2010.04.006
Access rights Closed access
Type Article
Web of Science ID WOS:000279706900008
URI http://repositorio.unifesp.br/handle/11600/32878

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