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| BAEZA,MARCELO E; SANHUEZA,MARIO A; CIFUENTES,VÍCTOR H. |
| The secretion of proteinaceous toxins is a widespread characteristic in environmental and laboratory yeast isolates, a phenomenon called "killer system". The killer phenotype (K+) can be encoded by extrachromosomal genetic elements (EGEs) as double stranded DNA or RNA molecules (dsDNA, dsRNA) or in nuclear genes. The spectrum of action and the activity of killer toxins are influenced by temperature, salinity and pH of media. In the present work we determined the existence of K+ in a collection of S. cerevisiae and P. anómala yeasts isolated from environmental, industrial and clinical sources. The assays were performed in strains belonging to three yeast genera used as sensitive cells and under a wide range of pH and temperatures. Approximately 51 % of... |
| Tipo: Journal article |
Palavras-chave: Killer system; Mycotoxin; DsRNA. |
| Ano: 2008 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200007 |
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| Labreuche, Yannick; Veloso, Artur; De La Vega, Enrique; Gross, Paul S.; Chapman, Robert W.; Browdy, Craig L.; Warr, Gregory W.. |
| Many questions remain unanswered regarding RNAi-based mechanisms and dsRNA-induced antiviral immune responses in penaeid shrimp. In this study, we report the characterization in the white leg shrimp Litopenaeus vannamei of RNAi pathway associated proteins Lv-Ago 1 and Lv-Ago 2, two members of the Argonaute family of proteins, as well as Lv-sid 1, the first shrimp homologue of Sid-1, a membrane channel-forming protein implicated in the cellular import of dsRNA. To decipher their functional implication in RNAi-related phenomena, we monitored their relative expression following stimulation by specific and non-specific RNA duplexes of diverse length. The findings show that the length of small RNA duplexes plays a critical role in the activation of both... |
| Tipo: Text |
Palavras-chave: Shrimp; Litopenaeus vannamei; RNAi; DsRNA; Argonaute; Sid-1; Antiviral immunity. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00015/12652/9587.pdf |
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| Huvet, Arnaud; Beguel, Jean-philippe; Pereira Cavaleiro, Nathalia; Thomas, Yoann; Quillien, Virgile; Boudry, Pierre; Alunno-bruscia, Marianne; Fabioux, Caroline. |
| Feeding strategies and digestive capacities can have important implications for variation in energetic pathways associated with ecological and economically important traits, such as growth or reproduction in bivalve species. Here, we investigated the role of amylase in the digestive processes of Crassostrea gigas, using in vivo RNA interference. This approach also allowed us to investigate the relationship between energy intake by feeding and gametogenesis in oysters. Double-stranded (ds)RNA designed to target the two α-amylase genes A and B was injected in vivo into the visceral mass of oysters at two doses. These treatments caused significant reductions in mean mRNA levels of the amylase genes: −50.7% and −59% mRNA A, and −71.9% and −70.6% mRNA B in 15... |
| Tipo: Text |
Palavras-chave: Alpha-Amylase; DsRNA; Gametogenesis; Marine bivalve; Dynamic energy budget. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00271/38239/36422.pdf |
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| Tavares,Eder T.; Tatagiba,Joseli S.; Ventura,José A.; Souza Jr.,Manoel T.. |
| A diagnose da meleira do mamoeiro (Carica papaya)tem sido feita mediante observação de sintomas que aparecem principalmente nos frutos ou pela detecção de dsRNA de cerca de 12 kb, purificado a partir do látex em coluna de CF11, em gel de agarose ou poliacrilamida. Os sintomas nos frutos são tardios e permitem longa permanência de plantas infectadas no campo e o processo usado para detectar dsRNA é laborioso, não se prestando a detecção em larga escala. Visando disponibilizar protocolos de diagnose precoce da meleira que possam ser usados em larga escala, o presente trabalho apresenta dois métodos de detecção relativamente baratos, rápidos e que permitem o manuseio de dezenas de amostras por dia. Os dois métodos utilizam o látex extraído dos frutos, folhas... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Carica papaya; DsRNA; Vírus. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582004000500018 |
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| MOREIRA,ANDREIA E.; GASPAR,JOSÉ O.. |
| Um isolado do Southern bean mosaic virus (SBMV), gênero Sobemovirus, encontrado em feijoeiro (Phaseolus vulgaris) no Estado de São Paulo, foi purificado e algumas de suas propriedades moleculares determinadas. As partículas virais apresentam diâmetro de 28-30 nm e proteína capsidial com massa molecular estimada em 30 kDa. Das partículas virais foi extraído RNA de vários tamanhos (4,2 Kb, 3,1 Kb, 2,65 Kb, 2,15 Kb, 1,64 Kb, 1,36 Kb e 1,0 Kb) sendo aquele de 4,2 Kb o RNA genômico e o de 1,0 Kb supostamente um subgenômico que codifica para a proteína capsidial. Ácidos ribonucleicos de mesmo tamanho foram também detectados in vivo, indicando estar associados à replicação viral. Na análise do RNA de fita dupla (dsRNA), somente duas espécies foram detectadas (4,2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Replicação viral; DsRNA; Sobemovirus; Proteína capsidial. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000300009 |
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