Embryological development of the mouth parts and related structures of the milkweed bug, Oncopeltus fasciatus (Dallas)

Newcomer, W. S.

doi:10.1002/jmor.1050820306

Cited by 24 publications

(12 citation statements)

References 8 publications

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“…Another difference in pb expression in the milkweed bug is its expression in a dorsal maxillary position, something not seen in Drosophila crickets or firebrats (Pultz et al 1988; these results). This expression maps to the anlage of the maxillary plate, a structure morphologically unique to hemipteran insects located at the dorsal edge of the maxillary segment (Carver et al 1991; Newcomer 1948; Rogers and Kaufman 1997). Therefore, this novel domain would appear to result from a gain of expression in the dorsal maxillary embryonic primordia.…”

Section: Discussionmentioning

confidence: 99%

“…2B). Specifically, the ventral component of the maxillary and mandibular segments form setal sacs, which are internalized and produce the stylets that are extruded before hatching (Newcomer 1948). When a fully formed stylet is extruded, it runs from the sac toward the midline of the head under the labrum, where it joins with the corresponding stylet from the contralateral side of the head.…”

Section: Introductionmentioning

confidence: 99%

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The development and evolution of insect mouthparts as revealed by the expression patterns of gnathocephalic genes

Rogers

Peterson

Kaufman

2002

Evolution and Development

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To understand better both the development and evolution of insect mouthparts, we have compared the expression pattern of several developmentally important genes in insects with either mandibulate or stylate-haustellate mouthparts. Specifically, we examined the expression of the proboscipedia (pb) and Distal-less (Dll) gene products as well as three regulators of pb, Sex combs reduced (Scr), Deformed (Dfd), and cap 'n' collar (cnc). These genes are known to control the identity of cells in the gnathal segments of Drosophila melanogaster and would appear to have similar conserved functions in other insects. Together we have made an atlas of gene expression in the heads of three insects: Thermobia domestica and Acheta domestica, which likely exemplify the mandibulate mouthparts present in the common insect ancestor, and Oncopeltus fasciatus, which has piercing-sucking mouth parts that are typical of the Hemiptera. At the earliest stages of embryogenesis, only the expression of pb was found to differ dramatically between Oncopeltus and the other insects examined, although significant differences were observed later in development. This difference in pb expression reflects an apparent divergence in the specification of gnathal identity between mandibulate and stylate-haustellate mouthparts, which may result from a "phylogenetic homeosis" that occurred during the evolution of the Hemiptera.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The development and evolution of insect mouthparts as revealed by the expression patterns of gnathocephalic genes

Rogers

Peterson

Kaufman

2002

Evolution and Development

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“…The hemipteran O. fasciatus has been used in seminal studies on embryology 19,20 , cytogenetics 21,22 , biochemistry 23,24 , nucleic acids 25 and interaction with its natural or experimental trypanosomatid parasites 26–28 . Some of these studies date back to 1926 26,29 when a natural infection of O. fasciatus by Leptomonas spp.…”

Section: Introductionmentioning

confidence: 99%

Natural infection by the protozoan Leptomonas wallacei impacts the morphology, physiology, reproduction, and lifespan of the insect Oncopeltus fasciatus

Vasconcellos

Carvalho

Silveira

et al. 2019

Sci Rep

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Trypanosomatids are protozoan parasites that infect thousands of globally dispersed hosts, potentially affecting their physiology. Several species of trypanosomatids are commonly found in phytophagous insects. Leptomonas wallacei is a gut-restricted insect trypanosomatid only retrieved from Oncopeltus fasciatus. The insects get infected by coprophagy and transovum transmission of L. wallacei cysts. The main goal of the present study was to investigate the effects of a natural infection by L. wallacei on the hemipteran insect O. fasciatus, by comparing infected and uninfected individuals in a controlled environment. The L. wallacei-infected individuals showed reduced lifespan and morphological alterations. Also, we demonstrated a higher infection burden in females than in males. The infection caused by L. wallacei reduced host reproductive fitness by negatively impacting egg load, oviposition, and eclosion, and promoting an increase in egg reabsorption. Moreover, we associated the egg reabsorption observed in infected females, with a decrease in the intersex gene expression. Finally, we suggest alterations in population dynamics induced by L. wallacei infection using a mathematical model. Collectively, our findings demonstrated that L. wallacei infection negatively affected the physiology of O. fasciatus, which suggests that L. wallacei potentially has a vast ecological impact on host population growth.

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“…La conformación final de la cabeza se adquiere principalmente durante la intertrepsis y comienzo de la katatrepsis (Fig.3.4). En la banda germinal media (3dAEL; Fig.3.4A) A los 5dAEL (Fig.3.4C (Newcomer, 1948) y estudios comparativos en hemípteros adultos (Butt, 1943;Parsosns, 1974), los palpos maxilares y labiales quedan reducidos a unas pocas sensilas, el labio se extiende como un pico trisegmentado, las mandíbulas y las lacinias maxilares se transforman en cuatro estiletes coadaptados entre sí a lo largo para formar un fascículo encerrado en el labio. Los estiletes maxilares forman internamente dos canales, uno alimenticio y otro salival.…”

Section: C2-foco Sobre Las Estructuras Cefálicasunclassified

“…Al momento de la eclosión, los estiletes y sus vainas se desenrollan, protruyen y se acomodan en el surco labial. Proximalmente, la mandíbula articula con un apodema de la cabeza, cercano a la antena (Newcomer, 1948;Heming, 2003 147 ANEXO VII muestra figuras de la cabeza de un insecto con aparato bucal masticador generalizado y de hemípteros, con aparato suctopicador.…”

Section: C2-foco Sobre Las Estructuras Cefálicasunclassified

Estudios funcionales comparados de la evolución de la segmentación en insectos

Behrens¹

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La presente tesis comprende una revisión del desarrollo de Rhodnius prolixus (Stähl, 1859); anotación de genes del desarrollo temprano y estudios de expresión y funcionales de dos de esos genes. El objetivo general ha sido aportar datos que contribuyan a establecer redes génicas como blanco de la evolución de la forma en los insectos. Los objetivos específicos fueron: Identificar y anotar en el genoma de R.prolixus genes ortólogos a los genes HOX de Drosophila melanogaster (Meigen, 1830); caracterizar el cluster HOX y determinar la función de genes HOX mediante genómica funcional. Se identificaron 70 genes, la mayoría de ellos correspondientes al grupo de TF con homeobox. Se analizaron, curaron y anotaron 26 secuencias; incluyendo a los ocho HOX canónicos. Se logró demostrar que los genes HOX de R.prolixus están agrupados en un cluster y se plantean cinco agrupamientos probables. Los ensayos funcionales se realizaron usando un gen HOX ‒scr‒ y un activador HOX ‒caudal‒ involucrado en el establecimiento del eje anteroposterior. Para ello, se pusieron a punto las técnicas de hibridación in situ de embriones completos ‒WMISH‒ y de ARNi parental. La expresión de scr mostró un patrón acorde a lo esperado en relación a las observaciones hechas en otros insectos. La ARNi mostró variantes en comparación con especies relacionadas, pero se ajusta muy bien a lo esperado. La expresión de caudal muestra las siguientes similitudes con respecto a otras especies estudiadas: (1) actúa tempranamente como gen de efecto materno, (2) se expresa en la región posterior del huevo en estado de blastodermo, (3) los efectos de la ARNi son semejantes a los encontrados en otros insectos de banda germinal corta. Sin embargo, en estados de banda germinal, los resultados de expresión difieren respecto a otras observaciones, esto puede estar en relación con mecanismos de sañalización aún no descriptos para este gen.

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Embryological development of the mouth parts and related structures of the milkweed bug, Oncopeltus fasciatus (Dallas)

Cited by 24 publications

References 8 publications

The development and evolution of insect mouthparts as revealed by the expression patterns of gnathocephalic genes

The development and evolution of insect mouthparts as revealed by the expression patterns of gnathocephalic genes

Natural infection by the protozoan Leptomonas wallacei impacts the morphology, physiology, reproduction, and lifespan of the insect Oncopeltus fasciatus

Estudios funcionales comparados de la evolución de la segmentación en insectos

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