1
|
Madeira FF, Alevi KCC, Castro NFDC, Vilamaior PSL, da Rosa JA, Azeredo-Oliveira MTVD. Reproductive Aspects of Chagas Disease Vectors: Evidence of Transcriptional Activity during the Nucleolar Persistence Phenomenon in the Spermatogenesis of Triatomines. Am J Trop Med Hyg 2019; 101:602-604. [PMID: 31359857 DOI: 10.4269/ajtmh.19-0226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The subfamily Triatominae currently consists of 154 species, most of them being of great importance for public health because they are considered potential vectors of the protozoan Trypanosoma cruzi, the etiologic agent of Chagas disease. In addition to their epidemiological importance, these insects are considered important biological models for cell studies because they have peculiar characteristics in their cells, for example, persistence of the nucleolus during spermatogenesis. This phenomenon is characterized by the presence of the nucleolus or nucleolar corpuscles during all phases of meiosis. To date, all knowledge is restricted to the study of the presence/absence of the nucleolus during the triatomine meiosis, so the present work aimed to analyze if this persistent nucleolar material has transcriptional activity. Analysis of the meiotic metaphases of Rhodnius montenegrensis and Panstrongylus megistus by using fluorochrome acridine orange made it possible to characterize the presence of RNA in the nucleolar material. Thus, it was demonstrated, for the first time, that the persistent nucleolar material during triatomine meiosis is transcriptionally active, supporting the hypothesis of the relationship between nucleolar persistence during meiosis of these insects and the formation of the chromoid body, an organelle responsible for the support of all transcriptional activities during spermiogenesis.
Collapse
Affiliation(s)
- Fernanda Fernandez Madeira
- Instituto de Biociências Letras e Ciências Exatas, Universidade Estadual Paulista (UNESP), São José do Rio Preto, Brazil
| | | | | | | | - João Aristeu da Rosa
- Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista (UNESP), Araraquara, Brazil
| | | |
Collapse
|
2
|
Madeira FF, Borsatto KC, Lima ACC, Ravazi A, de Oliveira J, da Rosa JA, de Azeredo-Oliveira MTV, Alevi KCC. Nucleolar Persistence: Peculiar Characteristic of Spermatogenesis of the Vectors of Chagas Disease (Hemiptera, Triatominae). Am J Trop Med Hyg 2016; 95:1118-1120. [PMID: 27645782 PMCID: PMC5094227 DOI: 10.4269/ajtmh.16-0149] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Accepted: 04/28/2016] [Indexed: 11/07/2022] Open
Abstract
All species of triatomines are considered potential vectors of Chagas disease and the reproductive biology of these bugs has been studied by different approaches. In 1999, nucleolar persistence during meiosis was observed in the subfamily for the first time. Recently, it has been observed that all species within the genus Rhodnius exhibit the same phenomenon, suggesting that it may be a synapomorphy of the triatomines. Thus, this article aims to analyze the nucleolar behavior during spermatogenesis of 59 triatomine species. All analyzed species exhibited nucleolar persistence during meiosis. Recently, it has been suggested that nucleolar persistence may be fundamental for the spermatogenesis of these vectors, since it is related to the formation of the chromatoid body. Therefore, we emphasize that this phenomenon is a peculiarity of the Triatominae subfamily and that further studies are required to analyze whether the nucleolar material that persists is active.
Collapse
Affiliation(s)
- Fernanda Fernandez Madeira
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista-São José do Rio Preto, São Paulo, Brazil
| | - Kelly Cristine Borsatto
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista-São José do Rio Preto, São Paulo, Brazil
| | - Anna Claudia Campaner Lima
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista-São José do Rio Preto, São Paulo, Brazil
| | - Amanda Ravazi
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista-São José do Rio Preto, São Paulo, Brazil
| | - Jader de Oliveira
- Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista-Araraquara, São Paulo, Brazil
| | - João Aristeu da Rosa
- Departamento de Ciências Biológicas, Faculdade de Ciências Farmacêuticas, Universidade Estadual Paulista-Araraquara, São Paulo, Brazil
| | | | - Kaio Cesar Chaboli Alevi
- Departamento de Biologia, Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista-São José do Rio Preto, São Paulo, Brazil.
| |
Collapse
|
3
|
Borgueti ADO, Alevi KCC, Silistino-Souza R, Rosa JAD, Azeredo-Oliveira MTVD. Immunofluorescence and ultrastructural analysis of the chromatoid body during spermatogenesis of Triatoma platensis and T. rubrovaria (Hemiptera, Triatominae). Micron 2015; 74:44-6. [PMID: 25939088 DOI: 10.1016/j.micron.2015.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 04/06/2015] [Accepted: 04/07/2015] [Indexed: 10/23/2022]
Abstract
This study sought to analyze spermatogenesis in two species of triatomines (Triatoma rubrovaria and T. platensis) by focusing on the chromatoid body (CB) during three stages of spermatogenesis (spermatocytogenesis, meiosis, and spermiogenesis). The cytochemistry technique known as silver impregnation revealed nucleolar persistence. We suggest that this phenomenon is fundamental to the formation of the CB during spermatogenesis, as it allows for the nucleolus or nucleolar fragments to maintain their transcriptional activity during the entire meiosis phase and to apply all transcribed RNA to CB formation. The ultrastructural analysis of T. platensis and T. rubrovaria spermatids revealed the presence of the nucleolus within the spermatid nucleus, as well as the CB near the nuclear membrane. Immunofluorescence for fibrillarin revealed the presence of protein in both the nucleolus and the cytoplasm of spermatogonia. Based on these findings, we suggest that the formation of the CB begins during the first phase of spermatogenesis, or spermatocytogenesis. Furthermore, we also observed the presence of fibrillarin protein in the CB near the elongating spermatids. Unlike the spermatogonia, spermatids showed no fibrillarin markings in the nucleolar region, a finding which is consistent with the lack of post-meiotic transcriptional activity during triatomine spermiogenesis. Thus, this study suggests that the formation of the CB begins during spermatocytogenesis and is intensified by transcriptional activity when nucleolar persistence occurs in meiosis. Moreover, the findings are consistent with the absence of transcriptional activity in the nucleolus during spermiogenesis, and they demonstrate that all transcriptional activity during spermatid differentiation is supported by the CB.
Collapse
Affiliation(s)
- Adauto de Oliveira Borgueti
- Laboratory of Cell Biology, Department of Biology, Institute of Biosciences, Humanities and the Exact Sciences, Sao Paulo State University-Júlio de Mesquita Filho (UNESP/IBILCE), Sao Jose do Rio Preto, SP, Brazil.
| | - Kaio Cesar Chaboli Alevi
- Laboratory of Cell Biology, Department of Biology, Institute of Biosciences, Humanities and the Exact Sciences, Sao Paulo State University-Júlio de Mesquita Filho (UNESP/IBILCE), Sao Jose do Rio Preto, SP, Brazil.
| | - Rosana Silistino-Souza
- Laboratory of Cell Biology, Department of Biology, Institute of Biosciences, Humanities and the Exact Sciences, Sao Paulo State University-Júlio de Mesquita Filho (UNESP/IBILCE), Sao Jose do Rio Preto, SP, Brazil.
| | - João Aristeu da Rosa
- Laboratory of Parasitology, Department of Biological Sciences, College of Pharmaceutical Sciences, Sao Paulo State University-Júlio de Mesquita Filho, (UNESP/FCFAR), Araraquara, SP, Brazil.
| | - Maria Tercília Vilela de Azeredo-Oliveira
- Laboratory of Cell Biology, Department of Biology, Institute of Biosciences, Humanities and the Exact Sciences, Sao Paulo State University-Júlio de Mesquita Filho (UNESP/IBILCE), Sao Jose do Rio Preto, SP, Brazil.
| |
Collapse
|
4
|
Alevi KCC, Oliveira JD, Rosa JAD, Oliveira MTVDA. Coloration of the testicular peritoneal sheath as a synapomorphy of triatomines (Hemiptera, Reduviidae). BIOTA NEOTROPICA 2014. [DOI: 10.1590/1676-06032014009914] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Recently, were described some morphological characteristics of 18 species of terrestrial hemipteran grouped in the Alydidae, Coreidae, Corimelaenidae, Lygaeidae, Rhopalidae, Scutelleridae, Tingidae and Reduviidae family that presented found variation in coloration of testicular peritoneal sheath (Reddish, Orange, Yellowish or Transparent). Thus, this study aims to analyzed the coloration of the peritoneal sheath in 44 species of triatomines grouped in nine different genera, with the aim of analyze whether the insects of the Triatominae subfamily also show variations in coloration. By means of analysis of the sheath was possible to observe that members of this subfamily have no interspecific differences, because all species have a transparent sheath. Thus, this paper describes the coloring of the peritoneal sheath in 44 species of the subfamily Triatominae and mainly suggests that the transparent color is one synapomorphy of this important group of insect vectors.
Collapse
|