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Pesquisa : A08.675.650.850.625.660 [Categoria DeCS]
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  1 / 2550 MEDLINE  
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[PMID]:28464429
[Au] Autor:Bartoletti R; Capozzoli B; Moore J; Moran J; Shrawder B; Vivekanand P
[Ad] Endereço:Biology Department, Susquehanna University, Selinsgrove, Pennsylvania, 17870.
[Ti] Título:Short hairpin RNA is more effective than long hairpin RNA in eliciting pointed loss-of-function phenotypes in Drosophila.
[So] Source:Genesis;55(7), 2017 Jul.
[Is] ISSN:1526-968X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Pointed (Pnt) is a transcriptional activator that functions downstream of the highly conserved Receptor Tyrosine Kinase (RTK) signaling pathway. Pnt is an ETS family transcription factor and encodes for two proteins, PntP1 and PntP2. However, while PntP1 is constitutively active, PntP2 is only active after being phosphorylated by MAPK in the RTK pathway. As mutations in pnt perturb the development of several tissues, we wanted to examine the effect and efficacy of using RNAi to target Pnt. We have expressed pnt RNAi in the eyes, oocyte, and heart cells using three different RNAi lines: Valium20, Valium10, and VDRC. Valium20 is distinct since it generates a short hairpin RNA (shRNA), while Valium10 and VDRC produce long hairpin dsRNA. We found that for each tissue examined Valium20 exhibited the strongest phenotype while the Valium10 and VDRC lines produced varying levels of severity and that the long hairpin RNA produced by the Valium10 and VDRC lines are unable to effectively knockdown pnt in embryonic tissues.
[Mh] Termos MeSH primário: Drosophila/genética
Inativação Gênica
Mutação com Perda de Função
Fenótipo
RNA Interferente Pequeno/genética
[Mh] Termos MeSH secundário: Animais
Linhagem Celular
Proteínas de Ligação a DNA/genética
Proteínas de Ligação a DNA/metabolismo
Proteínas de Drosophila/genética
Proteínas de Drosophila/metabolismo
Feminino
Masculino
Miocárdio/metabolismo
Proteínas do Tecido Nervoso/genética
Proteínas do Tecido Nervoso/metabolismo
Oócitos/metabolismo
Células Fotorreceptoras de Invertebrados/metabolismo
Proteínas Proto-Oncogênicas/genética
Proteínas Proto-Oncogênicas/metabolismo
Fatores de Transcrição/genética
Fatores de Transcrição/metabolismo
[Pt] Tipo de publicação:LETTER
[Nm] Nome de substância:
0 (DNA-Binding Proteins); 0 (Drosophila Proteins); 0 (Nerve Tissue Proteins); 0 (Proto-Oncogene Proteins); 0 (RNA, Small Interfering); 0 (Transcription Factors); 0 (pnt protein, Drosophila)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180116
[Lr] Data última revisão:
180116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170503
[St] Status:MEDLINE
[do] DOI:10.1002/dvg.23036


  2 / 2550 MEDLINE  
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[PMID]:29182504
[Au] Autor:Porter ML; Steck M; Roncalli V; Lenz PH
[Ti] Título:Molecular Characterization of Copepod Photoreception.
[So] Source:Biol Bull;233(1):96-110, 2017 Aug.
[Is] ISSN:1939-8697
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Copepod crustaceans are an abundant and ecologically significant group whose basic biology is guided by numerous visually guided behaviors. These behaviors are driven by copepod eyes, including naupliar eyes and Gicklhorn's organs, which vary widely in structure and function among species. Yet little is known about the molecular aspects of copepod vision. In this study we present a general overview of the molecular aspects of copepod vision by identifying phototransduction genes from newly generated and publicly available RNA-sequencing data and assemblies from 12 taxonomically diverse copepod species. We identify a set of 10 expressed transcripts that serve as a set of target genes for future studies of copepod phototransduction. Our more detailed evolutionary analyses of the opsin gene responsible for forming visual pigments found that all of the copepod species investigated express two main groups of opsins: middle-wavelength-sensitive (MWS) opsins and pteropsins. Additionally, there is evidence from a few species (e.g., Calanus finmarchicus, Eurytemora affinis, Paracyclopina nana, and Lernaea cyprinacea) for the expression of two additional groups of opsins-the peropsins and rhodopsin 7 (Rh7) opsins-at low levels or distinct developmental stages. An ontogenetic analysis of opsin expression in Calanus finmarchicus found the expression of a single dominant MWS opsin, as well as evidence for differences in expression across development in some MWS, pteropsin, and Rh7 opsins, with expression peaking in early naupliar through early copepodite stages.
[Mh] Termos MeSH primário: Copépodes/fisiologia
Transdução de Sinal Luminoso/genética
Células Fotorreceptoras de Invertebrados/fisiologia
[Mh] Termos MeSH secundário: Animais
Copépodes/genética
Perfilação da Expressão Gênica
Regulação da Expressão Gênica no Desenvolvimento
Opsinas/genética
Visão Ocular/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Opsins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180111
[Lr] Data última revisão:
180111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171129
[St] Status:MEDLINE
[do] DOI:10.1086/694564


  3 / 2550 MEDLINE  
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[PMID]:29182503
[Au] Autor:Morehouse NI; Buschbeck EK; Zurek DB; Steck M; Porter ML
[Ti] Título:Molecular Evolution of Spider Vision: New Opportunities, Familiar Players.
[So] Source:Biol Bull;233(1):21-38, 2017 Aug.
[Is] ISSN:1939-8697
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Spiders are among the world's most species-rich animal lineages, and their visual systems are likewise highly diverse. These modular visual systems, composed of four pairs of image-forming "camera" eyes, have taken on a huge variety of forms, exhibiting variation in eye size, eye placement, image resolution, and field of view, as well as sensitivity to color, polarization, light levels, and motion cues. However, despite this conspicuous diversity, our understanding of the genetic underpinnings of these visual systems remains shallow. Here, we review the current literature, analyze publicly available transcriptomic data, and discuss hypotheses about the origins and development of spider eyes. Our efforts highlight that there are many new things to discover from spider eyes, and yet these opportunities are set against a backdrop of deep homology with other arthropod lineages. For example, many (but not all) of the genes that appear important for early eye development in spiders are familiar players known from the developmental networks of other model systems (e.g., Drosophila). Similarly, our analyses of opsins and related phototransduction genes suggest that spider photoreceptors employ many of the same genes and molecular mechanisms known from other arthropods, with a hypothesized ancestral spider set of four visual and four nonvisual opsins. This deep homology provides a number of useful footholds into new work on spider vision and the molecular basis of its extant variety. We therefore discuss what some of these first steps might be in the hopes of convincing others to join us in studying the vision of these fascinating creatures.
[Mh] Termos MeSH primário: Evolução Molecular
Aranhas/genética
[Mh] Termos MeSH secundário: Animais
Opsinas/genética
Células Fotorreceptoras de Invertebrados/fisiologia
Aranhas/classificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Opsins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180111
[Lr] Data última revisão:
180111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171129
[St] Status:MEDLINE
[do] DOI:10.1086/693977


  4 / 2550 MEDLINE  
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[PMID]:29182502
[Au] Autor:Kingston ACN; Chappell DR; Miller HV; Lee SJ; Speiser DI
[Ti] Título:Expression of G Proteins in the Eyes and Parietovisceral Ganglion of the Bay Scallop Argopecten irradians.
[So] Source:Biol Bull;233(1):83-95, 2017 Aug.
[Is] ISSN:1939-8697
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A multitude of image-forming eyes are spread across the bodies of certain invertebrates. Recent efforts have characterized how these eyes function, but less progress has been made toward describing the neural structures associated with them. Scallops, for example, have a distributed visual system that includes dozens of eyes whose optic nerves project to the lateral lobes of the parietovisceral ganglion (PVG). To identify sensory receptors and chemical synapses associated with the scallop visual system, we studied the expression of four G protein α subunits (Gα , Gα , Gα , and Gα ) in the eyes and PVG of the bay scallop Argopecten irradians (Lamarck, 1819). In the eyes of A. irradians, we noted expression of Gα by the ciliary photoreceptors of the distal retina, expression of Gα by the rhabdomeric photoreceptors of the proximal retina, and the expression of Gα and Gα by the cells of the cornea; we did not, however, detect expression of Gα or Gα in the eyes. In the PVG of A. irradians, we noted widespread expression of Gα , Gα , and Gα . The expression of Gα was limited to fine neurites in the lateral and ventral central lobes, as well as large unipolar neurons in the dorsal central lobes. Our findings suggest that light detection by the eyes of A. irradians is conferred primarily by photoreceptors that express Gα or Gα , that the corneal cells of scallops may contain sensory receptors and/or receive neural input, and that G protein labeling is useful for visualizing substructures and identifying specific populations of cells within the nervous systems of invertebrates.
[Mh] Termos MeSH primário: Subunidades alfa de Proteínas de Ligação ao GTP/genética
Expressão Gênica
Pectinidae/genética
[Mh] Termos MeSH secundário: Animais
Subunidades alfa de Proteínas de Ligação ao GTP/metabolismo
Gânglios dos Invertebrados/fisiologia
Perfilação da Expressão Gênica
Pectinidae/citologia
Células Fotorreceptoras de Invertebrados/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (GTP-Binding Protein alpha Subunits)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180111
[Lr] Data última revisão:
180111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171129
[St] Status:MEDLINE
[do] DOI:10.1086/694448


  5 / 2550 MEDLINE  
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[PMID]:29182501
[Au] Autor:Bok MJ; Porter ML; Ten Hove HA; Smith R; Nilsson DE
[Ti] Título:Radiolar Eyes of Serpulid Worms (Annelida, Serpulidae): Structures, Function, and Phototransduction.
[So] Source:Biol Bull;233(1):39-57, 2017 Aug.
[Is] ISSN:1939-8697
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Fan worms, represented by sabellid and serpulid polychaetes, have an astonishing array of unusual eyes and photoreceptors located on their eponymous feeding appendages. Here we organize the previous descriptions of these eyes in serpulids and report new anatomical, molecular, and physiological data regarding their structure, function, and evolution and the likely identity of their phototransduction machinery. We report that, as in sabellids, serpulids display a broad diversity of radiolar eye arrangements and ocellar structures. Furthermore, the visual pigment expressed in the eyes of Spirobranchus corniculatus, a species of the charismatic Christmas tree worms, absorbs light maximally at 464 nm in wavelength. This visual pigment closely matches the spectrum of downwelling irradiance in shallow coral reef habitats and lends support to the hypothesis that these radiolar photoreceptors function as a silhouette-detecting "burglar alarm" that triggers a rapid withdrawal response when the worm is threatened by potential predators. Finally, we report on the transcriptomic sequencing results for the radiolar eyes of S. corniculatus, which express invertebrate c-type opsins in their ciliary radiolar photoreceptors, closely related to the opsin found in the radiolar eyes of the sabellid Acromegalomma interruptum. We explore the potential for a shared evolutionary lineage between the radiolar photoreceptors of serpulids and sabellids and consider these unique innovations in the broader context of metazoan eye evolution.
[Mh] Termos MeSH primário: Anelídeos/fisiologia
Transdução de Sinal Luminoso/fisiologia
[Mh] Termos MeSH secundário: Animais
Anelídeos/anatomia & histologia
Luz
Opsinas/genética
Células Fotorreceptoras de Invertebrados/fisiologia
Transcriptoma
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Opsins)
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180111
[Lr] Data última revisão:
180111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171129
[St] Status:MEDLINE
[do] DOI:10.1086/694735


  6 / 2550 MEDLINE  
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[PMID]:29036187
[Au] Autor:Majot AT; Bidwai AP
[Ad] Endereço:Department of Biology, West Virginia University, Morgantown, West Virginia, United States of America.
[Ti] Título:Analysis of transient hypermorphic activity of E(spl)D during R8 specification.
[So] Source:PLoS One;12(10):e0186439, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Drosophila atonal (ato) is required for the specification of founding R8 photoreceptors during retinal development. ato is regulated via dual eye-specific enhancers; ato-3' is subject to initial induction whereas 5'-ato facilitates Notch-mediated autoregulation. Notch is further utilized to induce bHLH repressors of the E(spl) locus to restrict Ato from its initial broad expression to individual cells. Although Notch operates in two, distinct phases, it has remained unclear how the two phases maintain independence from one another. The difference in these two phases has attributed to the hypothesized delayed expression of E(spl). However, immunofluorescence data indicate that E(spl) are expressed during early Ato patterning, suggesting a more sophisticated underlying mechanism. To probe this mechanism, we provide evidence that although E(spl) exert no influence on ato-3', E(spl) repress 5'-ato and deletion of the E(spl) locus elicits precocious 5'-ato activity. Thus, E(spl) imposes a delay to the timing in which Ato initiates autoregulation. We next sought to understand this finding in the context of E(spl)D, which encodes a dysregulated variant of E(spl)M8 that perturbs R8 patterning, though, as previously reported, only in conjunction with the mutant receptor Nspl. We established a genetic interaction between E(spl)D and roughened eye (roe), a known modulator of Notch signaling in retinogenesis. This link further suggests a dosage-dependence between E(spl) and the proneural activators Ato and Sens, as indicated via interaction assays in which E(spl)D renders aberrant R8 patterning in conjunction with reduced proneural dosage. In total, the biphasicity of Notch signaling relies, to some degree, on the post-translational regulation of individual E(spl) members and, importantly, that post-translational regulation is likely necessary to modulate the level of E(spl) activity throughout the progression of Ato expression.
[Mh] Termos MeSH primário: Drosophila melanogaster/crescimento & desenvolvimento
Drosophila melanogaster/genética
Loci Gênicos/genética
Células Fotorreceptoras de Invertebrados/metabolismo
[Mh] Termos MeSH secundário: Animais
Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética
Fatores de Transcrição Hélice-Alça-Hélice Básicos/metabolismo
Proteínas de Drosophila/genética
Proteínas de Drosophila/metabolismo
Drosophila melanogaster/metabolismo
Elementos Facilitadores Genéticos/genética
Regulação da Expressão Gênica no Desenvolvimento
Mutação
Proteínas do Tecido Nervoso/genética
Proteínas do Tecido Nervoso/metabolismo
Fenótipo
Transporte Proteico
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Basic Helix-Loop-Helix Transcription Factors); 0 (Drosophila Proteins); 0 (Nerve Tissue Proteins); 0 (ato protein, Drosophila)
[Em] Mês de entrada:1711
[Cu] Atualização por classe:171106
[Lr] Data última revisão:
171106
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171017
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0186439


  7 / 2550 MEDLINE  
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[PMID]:28976975
[Au] Autor:Su H; Sureda-Gomez M; Rabaneda-Lombarte N; Gelabert M; Xie J; Wu W; Adell T
[Ad] Endereço:MOE Key Laboratory of Protein Science, School of Life Sciences, Tsinghua University, Beijing, China.
[Ti] Título:A C-terminally truncated form of ß-catenin acts as a novel regulator of Wnt/ß-catenin signaling in planarians.
[So] Source:PLoS Genet;13(10):e1007030, 2017 Oct.
[Is] ISSN:1553-7404
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:ß-Catenin, the core element of the Wnt/ß-catenin pathway, is a multifunctional and evolutionarily conserved protein which performs essential roles in a variety of developmental and homeostatic processes. Despite its crucial roles, the mechanisms that control its context-specific functions in time and space remain largely unknown. The Wnt/ß-catenin pathway has been extensively studied in planarians, flatworms with the ability to regenerate and remodel the whole body, providing a 'whole animal' developmental framework to approach this question. Here we identify a C-terminally truncated ß-catenin (ß-catenin4), generated by gene duplication, that is required for planarian photoreceptor cell specification. Our results indicate that the role of ß-catenin4 is to modulate the activity of ß-catenin1, the planarian ß-catenin involved in Wnt signal transduction in the nucleus, mediated by the transcription factor TCF-2. This inhibitory form of ß-catenin, expressed in specific cell types, would provide a novel mechanism to modulate nuclear ß-catenin signaling levels. Genomic searches and in vitro analysis suggest that the existence of a C-terminally truncated form of ß-catenin could be an evolutionarily conserved mechanism to achieve a fine-tuned regulation of Wnt/ß-catenin signaling in specific cellular contexts.
[Mh] Termos MeSH primário: Planárias/fisiologia
Via de Sinalização Wnt
beta Catenina/metabolismo
[Mh] Termos MeSH secundário: Animais
Proteínas do Domínio Armadillo/genética
Proteínas do Domínio Armadillo/metabolismo
Evolução Molecular
Homeostase
Modelos Biológicos
Fragmentos de Peptídeos/antagonistas & inibidores
Fragmentos de Peptídeos/genética
Fragmentos de Peptídeos/metabolismo
Células Fotorreceptoras de Invertebrados/fisiologia
Planárias/genética
Planárias/crescimento & desenvolvimento
Domínios e Motivos de Interação entre Proteínas
Regeneração
Fatores de Transcrição TCF/genética
Fatores de Transcrição TCF/metabolismo
beta Catenina/antagonistas & inibidores
beta Catenina/genética
gama Catenina/genética
gama Catenina/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Armadillo Domain Proteins); 0 (Peptide Fragments); 0 (TCF Transcription Factors); 0 (beta Catenin); 0 (gamma Catenin)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171005
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pgen.1007030


  8 / 2550 MEDLINE  
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[PMID]:28825699
[Au] Autor:Zihni C; Vlassaks E; Terry S; Carlton J; Leung TKC; Olson M; Pichaud F; Balda MS; Matter K
[Ad] Endereço:Institute of Ophthalmology, University College London, Bath Street, London EC1V 9EL, UK.
[Ti] Título:An apical MRCK-driven morphogenetic pathway controls epithelial polarity.
[So] Source:Nat Cell Biol;19(9):1049-1060, 2017 Sep.
[Is] ISSN:1476-4679
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Polarized epithelia develop distinct cell surface domains, with the apical membrane acquiring characteristic morphological features such as microvilli. Cell polarization is driven by polarity determinants including the evolutionarily conserved partitioning-defective (PAR) proteins that are separated into distinct cortical domains. PAR protein segregation is thought to be a consequence of asymmetric actomyosin contractions. The mechanism of activation of apically polarized actomyosin contractility is unknown. Here we show that the Cdc42 effector MRCK activates myosin-II at the apical pole to segregate aPKC-Par6 from junctional Par3, defining the apical domain. Apically polarized MRCK-activated actomyosin contractility is reinforced by cooperation with aPKC-Par6 downregulating antagonistic RhoA-driven junctional actomyosin contractility, and drives polarization of cytosolic brush border determinants and apical morphogenesis. MRCK-activated polarized actomyosin contractility is required for apical differentiation and morphogenesis in vertebrate epithelia and Drosophila photoreceptors. Our results identify an apical origin of actomyosin-driven morphogenesis that couples cytoskeletal reorganization to PAR polarity signalling.
[Mh] Termos MeSH primário: Membrana Celular/enzimologia
Polaridade Celular
Células Epiteliais/enzimologia
Miotonina Proteína Quinase/metabolismo
[Mh] Termos MeSH secundário: Actomiosina/metabolismo
Proteínas Adaptadoras de Transdução de Sinal/metabolismo
Animais
Animais Geneticamente Modificados
Células CACO-2
Proteínas de Ciclo Celular/metabolismo
Diferenciação Celular
Cães
Proteínas de Drosophila/genética
Proteínas de Drosophila/metabolismo
Drosophila melanogaster/citologia
Drosophila melanogaster/enzimologia
Genótipo
Fatores de Troca do Nucleotídeo Guanina/metabolismo
Seres Humanos
Células Madin Darby de Rim Canino
Proteínas de Membrana/metabolismo
Morfogênese
Miosina Tipo II/metabolismo
Miotonina Proteína Quinase/genética
Fenótipo
Células Fotorreceptoras de Invertebrados/enzimologia
Proteína Quinase C/metabolismo
Proteínas Serina-Treonina Quinases/genética
Proteínas Serina-Treonina Quinases/metabolismo
Interferência de RNA
Transdução de Sinais
Fatores de Tempo
Transfecção
Proteína cdc42 de Ligação ao GTP/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; VIDEO-AUDIO MEDIA
[Nm] Nome de substância:
0 (Adaptor Proteins, Signal Transducing); 0 (Cell Cycle Proteins); 0 (Drosophila Proteins); 0 (Guanine Nucleotide Exchange Factors); 0 (Membrane Proteins); 0 (PARD3 protein, human); 0 (PARD6A protein, human); 9013-26-7 (Actomyosin); EC 2.7.11.1 (Gek protein, Drosophila); EC 2.7.11.1 (Myotonin-Protein Kinase); EC 2.7.11.1 (Protein-Serine-Threonine Kinases); EC 2.7.11.13 (PKC-3 protein); EC 2.7.11.13 (Protein Kinase C); EC 3.6.1.- (Myosin Type II); EC 3.6.5.2 (cdc42 GTP-Binding Protein)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171004
[Lr] Data última revisão:
171004
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170822
[St] Status:MEDLINE
[do] DOI:10.1038/ncb3592


  9 / 2550 MEDLINE  
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[PMID]:28676323
[Au] Autor:Jakobsson J; Henze MJ; Svensson GP; Lind O; Anderbrant O
[Ad] Endereço:Department of Biology, Lund University, Sweden. Electronic address: johan.jakobsson@biol.lu.se.
[Ti] Título:Visual cues of oviposition sites and spectral sensitivity of Cydia strobilella L.
[So] Source:J Insect Physiol;101:161-168, 2017 Aug.
[Is] ISSN:1879-1611
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:We investigated whether the spruce seed moth (Cydia strobilella L., Tortricidae: Grapholitini), an important pest in seed orchards of Norway spruce (Picea abies (L.) Karst.), can make use of the spectral properties of its host when searching for flowers to oviposit on. Spectral measurements showed that the flowers, and the cones they develop into, differ from a background of P. abies needles by a higher reflectance of long wavelengths. These differences increase as the flowers develop into mature cones. Electroretinograms (ERGs) in combination with spectral adaptation suggest that C. strobilella has at least three spectral types of photoreceptor; an abundant green-sensitive receptor with maximal sensitivity at wavelength λ =526nm, a blue-sensitive receptor with λ =436nm, and an ultraviolet-sensitive receptor with λ =352nm. Based on our spectral measurements and the receptor properties inferred from the ERGs, we calculated that open flowers, which are suitable oviposition sites, provide detectable achromatic, but almost no chromatic contrasts to the background of needles. In field trials using traps of different spectral properties with or without a female sex pheromone lure, only pheromone-baited traps caught moths. Catches in baited traps were not correlated with the visual contrast of the traps against the background. Thus, visual contrast is probably not the primary cue for finding open host flowers, but it could potentially complement olfaction as a secondary cue, since traps with certain spectral properties caught significantly more moths than others.
[Mh] Termos MeSH primário: Mariposas/fisiologia
Oviposição
Células Fotorreceptoras de Invertebrados/fisiologia
Percepção Visual
[Mh] Termos MeSH secundário: Animais
Sinais (Psicologia)
Feminino
Flores
Masculino
Células Fotorreceptoras de Invertebrados/classificação
Picea
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170928
[Lr] Data última revisão:
170928
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170706
[St] Status:MEDLINE


  10 / 2550 MEDLINE  
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[PMID]:28645749
[Au] Autor:Meserve JH; Duronio RJ
[Ad] Endereço:Curriculum in Genetics & Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA.
[Ti] Título:A population of G2-arrested cells are selected as sensory organ precursors for the interommatidial bristles of the Drosophila eye.
[So] Source:Dev Biol;430(2):374-384, 2017 10 15.
[Is] ISSN:1095-564X
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Cell cycle progression and differentiation are highly coordinated during the development of multicellular organisms. The mechanisms by which these processes are coordinated and how their coordination contributes to normal development are not fully understood. Here, we determine the developmental fate of a population of precursor cells in the developing Drosophila melanogaster retina that arrest in G2 phase of the cell cycle and investigate whether cell cycle phase-specific arrest influences the fate of these cells. We demonstrate that retinal precursor cells that arrest in G2 during larval development are selected as sensory organ precursors (SOPs) during pupal development and undergo two cell divisions to generate the four-cell interommatidial mechanosensory bristles. While G2 arrest is not required for bristle development, preventing G2 arrest results in incorrect bristle positioning in the adult eye. We conclude that G2-arrested cells provide a positional cue during development to ensure proper spacing of bristles in the eye. Our results suggest that the control of cell cycle progression refines cell fate decisions and that the relationship between these two processes is not necessarily deterministic.
[Mh] Termos MeSH primário: Olho Composto de Artrópodes/citologia
Drosophila melanogaster/citologia
Células Epiteliais/citologia
Fase G2
Mecanorreceptores/citologia
[Mh] Termos MeSH secundário: Animais
Pontos de Checagem do Ciclo Celular/fisiologia
Diferenciação Celular
Divisão Celular
Linhagem da Célula
Olho Composto de Artrópodes/crescimento & desenvolvimento
Olho Composto de Artrópodes/ultraestrutura
Proteínas de Drosophila/fisiologia
Drosophila melanogaster/crescimento & desenvolvimento
Discos Imaginais/citologia
Larva
Mecanorreceptores/ultraestrutura
Mecanotransdução Celular
Neuroglia/citologia
Células Fotorreceptoras de Invertebrados/citologia
Pupa
Células Receptoras Sensoriais/citologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Nm] Nome de substância:
0 (Drosophila Proteins)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171111
[Lr] Data última revisão:
171111
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170625
[St] Status:MEDLINE



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