scholarly journals Orcokinin neuropeptides regulate ecdysis in the hemimetabolous insect Rhodnius prolixus

2017 ◽  
Vol 81 ◽  
pp. 91-102 ◽  
Author(s):  
Juan Pedro Wulff ◽  
Ivana Sierra ◽  
Marcos Sterkel ◽  
Michiel Holtof ◽  
Pieter Van Wielendaele ◽  
...  
2019 ◽  
Author(s):  
Vitória Tobias-Santos ◽  
Diego Guerra-Almeida ◽  
Flavia Mury ◽  
Lupis Ribeiro ◽  
Mateus Berni ◽  
...  

AbstractGenes encoding small open-reading frames (smORFs) have been characterized as essential players of developmental processes. The smORF tarsaless/mille-pattes/polished-rice has been thoroughly investigated in holometabolous insects, such as the fruit fly Drosophila melanogaster and the red flour beetle Tribolium castaneum, while its function in hemimetabolous insects remains unknown. Thus, we analyzed the function of the tal/pri/mlpt ortholog in a hemimetabolous insect, the kissing bug Rhodnius prolixus (Rp). First, sequence analysis shows that Rp-tal/pri/mlpt polycistronic mRNA encodes two small peptides (11 to 14 amino acids) containing a LDPTG motif. Interestingly, a new hemipteran-specific conserved peptide of approximately 80 amino acids was also identified by in silico analysis. In silico docking analysis supports the high-affinity binding of the small LDPTG peptides to the transcription factor Shavenbaby. Rp-tal/pri/mlpt in situ hybridization and knockdown via RNA interference showed a conserved role of Rp-tal/pri/mlpt during embryogenesis, with a major role in the regulation of thoracic versus abdominal segmentation, leg development and head formation. Altogether, our study shows that tal/pri/mlpt segmentation role is conserved in the common ancestor of Paraneoptera and suggests that polycistronic genes might generate order specific smORFs.


Author(s):  
J. E. Lai-Fook

Dermal glands are epidermal derivatives which are reported to secrete either the cement layer, which is the outermost layer of the epicuticle or some component of the moulting fluid which digests the endocuticle. The secretions do not show well-defined staining reactions and therefore they have not been positively identified. This has contributed to another difficulty, namely, that of determining the time of secretory activity. This description of the fine structure of the developing glands in Rhodnius was undertaken to determine the time of activity, with a view to investigating their function.


2020 ◽  
Vol 129 (2) ◽  
pp. 189
Author(s):  
Jacenir Reis dos Santos-Mallet ◽  
Simone Patrícia Carneiro Freitas ◽  
Maria Luiza Ribeiro de Oliveira ◽  
Alice Helena Ricardo-Silva ◽  
Aníbal Gil Lopes ◽  
...  

2012 ◽  
Author(s):  
◽  
Lucía Elena Pagola

Todos los animales que poseen simetría bilateral se encuentran definidos por dos ejes de simetría ortogonales, el eje anteroposterior (A-P) que corre de la boca al ano y un eje perpendicular a este, el eje dorsoventral (D-V). A pesar de la gran variedad de modos de desarrollo embrionario y formas finales encontradas en los animales, las redes regulatorias y factores de transcripción que dan origen a estos ejes se encuentran muy conservados. De aquí surge una pregunta central, cómo estas redes regulatorias tan conservadas crean tanta diversidad morfológica, se adaptan a nuevos ambientes y de qué manera las novedades evolutivas se incorporan en un sistema de patronamiento ya establecido. El eje DV es un buen sistema de estudio ya que se conoce en detalle en Drosophila melanogaster pero no en otros insectos. Los insectos además presentan una gran variedad de especies y modos de desarrollo embrionario lo que nos permite estudiar de qué manera las redes regulatorias se adaptan a novedades evolutivas y la existencia de varias técnicas que permiten testear el funcionamiento de los genes y sus interacciones. En este contexto hemos utilizado a Rhodnius prolixus como modelo para el estudio del establecimiento del eje DV en un embrión de banda germinal intermedia donde al final del desarrollo el embrión posee la misma forma que el adulto. Hemos estudiado en detalle el desarrollo embrionario de R. prolixus para una mejor comprensión de los patrones de expresión de los genes estudiados y su función. Además, se han buscado y anotado varios genes envueltos en la formación del eje DV: toll, dorsal, decapentaplegic, zerknült, twist y zelda. Mostraremos el patrón de expresión y los fenotipos resultado de ARNi parental de toll, dpp y dorsal, los cuales representan puntos clave en la regulación de la cascada D-V.


1994 ◽  
Vol 72 (12) ◽  
pp. 2244-2247 ◽  
Author(s):  
Erwin Huebner ◽  
Rene Harrison ◽  
Karen Yeow

We report a method for artificially feeding the reduviid insect Rhodnius prolixus that utilizes heparinized rabbit blood enclosed in an artificial-membrane envelope. Envelopes of Parafilm M® or Nescofilm® are made by heat sealing two pieces, one of which is stretched first, on three sides. Blood is then put into the envelope, the air expelled, and the fourth side sealed with a bag sealer. The blood-filled envelopes are then placed on a standard slide warmer set at 37 °C and insects in jars with wire-mesh tops are allowed to feed. Normal gorging and subsequent molting of instars were attained. Adult females show normal fecundity (the E value was 0.19 for mated females) and egg hatchability was also normal. The method is simple, cost effective, and easy to implement. It is especially suited for experimental feedings.


2021 ◽  
pp. 104249
Author(s):  
Raquel A. Ferreira ◽  
Marcelo G. Lorenzo ◽  
Claudio R. Lazzari

Sign in / Sign up

Export Citation Format

Share Document