1
|
Alexandrino F, Malgarin JS, Krieger MA, Morello LG. Optimized broad-range real-time PCR-based method for bacterial screening of platelet concentrates. BRAZ J BIOL 2020; 81:692-700. [PMID: 32876173 DOI: 10.1590/1519-6984.229893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 03/08/2020] [Indexed: 11/22/2022] Open
Abstract
Bacterial contamination of blood components remains a major challenge in transfusion medicine, particularly, platelet concentrates (PCs) due to the storage conditions that support bacterial proliferation. In this study, we develop a rapid, sensitive and specific real-time PCR protocol for bacterial screening of PCs. An internally controlled real-time PCR-based method was optimized and validated with our proprietary 16S Universal PCR Master Mix (IBMP/Fiocruz), which targets a conserved region of the bacterial 16S rRNA gene. Nonspecific background DNA was completely eliminated by treating the PCR Master Mix with ethidium monoazide (EMA). A lower limit of detection was observed for 10 genome equivalents with an observed Ct value of 34±1.07 in calibration curve generated with 10-fold serial dilutions of E. coli DNA. The turnaround time for processing, including microbial DNA purification, was approximately 4 hours. The developed method showed a high sensitivity with no non-specific amplification and a lower time-to-detection than traditional microbiological methods, demonstrating it to be an efficient means of screening pre-transfusion PCs.
Collapse
Affiliation(s)
- F Alexandrino
- Instituto de Biologia Molecular do Paraná - IBMP, Rua Prof. Algacyr Munhoz Mader, 3775, CEP 81350-010, Curitiba, PR, Brasil
| | - J S Malgarin
- Instituto de Biologia Molecular do Paraná - IBMP, Rua Prof. Algacyr Munhoz Mader, 3775, CEP 81350-010, Curitiba, PR, Brasil
| | - M A Krieger
- Instituto de Biologia Molecular do Paraná - IBMP, Rua Prof. Algacyr Munhoz Mader, 3775, CEP 81350-010, Curitiba, PR, Brasil
| | - L G Morello
- Instituto de Biologia Molecular do Paraná - IBMP, Rua Prof. Algacyr Munhoz Mader, 3775, CEP 81350-010, Curitiba, PR, Brasil
| |
Collapse
|
2
|
Wippel HH, Malgarin JS, Martins SDT, Vidal NM, Marcon BH, Miot HT, Marchini FK, Goldenberg S, Alves LR. The Nuclear RNA-binding Protein RBSR1 Interactome in Trypanosoma cruzi. J Eukaryot Microbiol 2018; 66:244-253. [PMID: 29984450 DOI: 10.1111/jeu.12666] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 07/01/2018] [Accepted: 07/03/2018] [Indexed: 12/18/2022]
Abstract
Trypanosoma cruzi, the etiological agent of Chagas disease, has been widely studied, reflecting both its medical importance and the particular features that make this pathogen an attractive model for basic biological studies. The repression of transcripts by messenger ribonucleoprotein (mRNP) complexes is an important pathway of post-transcriptional regulation in eukaryotes, including T. cruzi. RBSR1 is a serine-arginine (SR)-rich RNA-binding protein (RBP) in T. cruzi that contains one RNA-recognition motif (RRM); this protein has a primarily nuclear localization and is developmentally regulated, not being detected in metacyclic trypomastigotes. RBSR1 interacts with other RBPs, such as UBP1 and UBP2, and the nuclear SR-protein TRRM1. Phylogenetic analysis indicated that RBSR1 is orthologous to the human splicing factor SRSF7, what might indicate its possible involvement in pre-RNA processing. Accordingly, ribonomics data showed the enrichment of snoRNAs and snRNAs in the RBSR1 immunoprecipiatation complex, hence reinforcing the supposition that this protein might be involved in RNA processing in the nucleus.
Collapse
Affiliation(s)
- Helisa H Wippel
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Juliane S Malgarin
- Molecular Biology Institute of Paraná, IBMP, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Sharon de Toledo Martins
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Newton M Vidal
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, 8600 Rockville Pike, Bethesda, Maryland, 20894
| | - Bruna H Marcon
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Hálisson T Miot
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Fabricio K Marchini
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Samuel Goldenberg
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| | - Lysangela R Alves
- Carlos Chagas Institute, FIOCRUZ, Rua Professor Algacyr Munhoz Mader 3775, Curitiba, Paraná, Brazil
| |
Collapse
|
3
|
Alves LR, Guerra-Slompo EP, de Oliveira AV, Malgarin JS, Goldenberg S, Dallagiovanna B. mRNA localization mechanisms in Trypanosoma cruzi. PLoS One 2013; 8:e81375. [PMID: 24324687 PMCID: PMC3852752 DOI: 10.1371/journal.pone.0081375] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2013] [Accepted: 10/13/2013] [Indexed: 01/06/2023] Open
Abstract
Asymmetric mRNA localization is a sophisticated tool for regulating and optimizing protein synthesis and maintaining cell polarity. Molecular mechanisms involved in the regulated localization of transcripts are widespread in higher eukaryotes and fungi, but not in protozoa. Trypanosomes are ancient eukaryotes that branched off early in eukaryote evolution. We hypothesized that these organisms would have basic mechanisms of mRNA localization. FISH assays with probes against transcripts coding for proteins with restricted distributions showed a discrete localization of the mRNAs in the cytoplasm. Moreover, cruzipain mRNA was found inside reservosomes suggesting new unexpected functions for this vacuolar organelle. Individual mRNAs were also mobilized to RNA granules in response to nutritional stress. The cytoplasmic distribution of these transcripts changed with cell differentiation, suggesting that localization mechanisms might be involved in the regulation of stage-specific protein expression. Transfection assays with reporter genes showed that, as in higher eukaryotes, 3'UTRs were responsible for guiding mRNAs to their final location. Our results strongly suggest that Trypanosoma cruzi have a core, basic mechanism of mRNA localization. This kind of controlled mRNA transport is ancient, dating back to early eukaryote evolution.
Collapse
Affiliation(s)
- Lysangela R. Alves
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
| | - Eloise P. Guerra-Slompo
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
| | - Arthur V. de Oliveira
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
| | - Juliane S. Malgarin
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
| | - Samuel Goldenberg
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
| | - Bruno Dallagiovanna
- Laboratório de Regulação da Expressão Gênica, Instituto Carlos Chagas, Fiocruz-Paraná. Curitiba, Paraná, Brasil
- * E-mail:
| |
Collapse
|