Pub Date : 2024-10-28DOI: 10.1016/j.cois.2024.101289
Barbora Konopová
Metamorphosis endowed the insects with properties that enabled them to conquer the Earth. It is a hormonally controlled morphogenetic process that transforms the larva into the adult. Metamorphosis appeared with the origin of wings and flight. The sesquiterpenoid juvenile hormone (JH) suppresses wing morphogenesis and ensures that metamorphosis takes place at the right ontogenetic time. This review explores the origin of insect metamorphosis and the ancestral function of JH. Fossil record shows that the first Paleozoic winged insects had (hemimetabolous) metamorphosis, and their larvae were likely aquatic. In the primitive wingless silverfish that lacks metamorphosis, JH is essential for late embryogenesis and reproduction. JH production after the embryo dorsal closure promotes hatching and terminal tissue maturation.
{"title":"Evolution of insect metamorphosis - an update.","authors":"Barbora Konopová","doi":"10.1016/j.cois.2024.101289","DOIUrl":"10.1016/j.cois.2024.101289","url":null,"abstract":"<p><p>Metamorphosis endowed the insects with properties that enabled them to conquer the Earth. It is a hormonally controlled morphogenetic process that transforms the larva into the adult. Metamorphosis appeared with the origin of wings and flight. The sesquiterpenoid juvenile hormone (JH) suppresses wing morphogenesis and ensures that metamorphosis takes place at the right ontogenetic time. This review explores the origin of insect metamorphosis and the ancestral function of JH. Fossil record shows that the first Paleozoic winged insects had (hemimetabolous) metamorphosis, and their larvae were likely aquatic. In the primitive wingless silverfish that lacks metamorphosis, JH is essential for late embryogenesis and reproduction. JH production after the embryo dorsal closure promotes hatching and terminal tissue maturation.</p>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":" ","pages":"101289"},"PeriodicalIF":5.8,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142567676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-27DOI: 10.1016/j.cois.2024.101293
Saheli Sengupta, Kravitz A Edward
Sexually dimorphic behaviors are fundamental to the biology of many species, including fruit flies and humans. These behaviors are regulated primarily by sex-specific neural circuits or the sex-specific modulation of shared neuronal substrates. In fruit flies, GABAergic neurotransmission plays a critical role in governing sexually dimorphic behaviors such as courtship, copulation, and aggression. This review explores the intricate roles of GABAergic neurons in these behaviors, and focuses on how sex-specific differences in GABAergic circuits contribute to their modulation and execution. By examining these mechanisms in Drosophila, we reveal broader implications for understanding sexual dimorphism in more complex organisms.
{"title":"Decoding Sex Differences: How GABA Shapes Drosophila Behavior.","authors":"Saheli Sengupta, Kravitz A Edward","doi":"10.1016/j.cois.2024.101293","DOIUrl":"https://doi.org/10.1016/j.cois.2024.101293","url":null,"abstract":"<p><p>Sexually dimorphic behaviors are fundamental to the biology of many species, including fruit flies and humans. These behaviors are regulated primarily by sex-specific neural circuits or the sex-specific modulation of shared neuronal substrates. In fruit flies, GABAergic neurotransmission plays a critical role in governing sexually dimorphic behaviors such as courtship, copulation, and aggression. This review explores the intricate roles of GABAergic neurons in these behaviors, and focuses on how sex-specific differences in GABAergic circuits contribute to their modulation and execution. By examining these mechanisms in Drosophila, we reveal broader implications for understanding sexual dimorphism in more complex organisms.</p>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":" ","pages":"101293"},"PeriodicalIF":5.8,"publicationDate":"2024-10-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142544295","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-25DOI: 10.1016/j.cois.2024.101288
Hua Yan
Insects represent the most diverse group of animals in the world. While the olfactory systems of different species share general principles of organization, they also exhibit a wide range of structural and functional diversity. Scientists have gained tremendous insight into olfactory neural development and function, notably in Drosophila, but also in other insect species (see reviews in [1-3]). In the last few years, new evidence has steadily mounted, e.g. the stoichiometry of odorant receptor and co-receptor (OR-Orco) complex. This review aims to highlight the recent progress on four aspects: (1) the structure and function of the OR-Orco complex, (2) chemosensory gene co-expression, (3) diverse neural developmental processes, and (4) the role of genes and neurons in olfactory development and olfactory-mediated behavior.
{"title":"Insect olfactory neurons: receptors, development and function.","authors":"Hua Yan","doi":"10.1016/j.cois.2024.101288","DOIUrl":"https://doi.org/10.1016/j.cois.2024.101288","url":null,"abstract":"<p><p>Insects represent the most diverse group of animals in the world. While the olfactory systems of different species share general principles of organization, they also exhibit a wide range of structural and functional diversity. Scientists have gained tremendous insight into olfactory neural development and function, notably in Drosophila, but also in other insect species (see reviews in [1-3]). In the last few years, new evidence has steadily mounted, e.g. the stoichiometry of odorant receptor and co-receptor (OR-Orco) complex. This review aims to highlight the recent progress on four aspects: (1) the structure and function of the OR-Orco complex, (2) chemosensory gene co-expression, (3) diverse neural developmental processes, and (4) the role of genes and neurons in olfactory development and olfactory-mediated behavior.</p>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":" ","pages":"101288"},"PeriodicalIF":5.8,"publicationDate":"2024-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142567705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.cois.2024.101287
Zinan Wang , Ignatius P Andika , Henry Chung
Cuticular hydrocarbons (CHCs) play pleiotropic roles in insect survival and reproduction. They prevent desiccation and function as pheromones influencing different behaviors. While the genes in the CHC biosynthesis pathway have been extensively studied, the regulatory mechanisms that lead to different CHC compositions received far less attention. In this review, we present an overview of how different hormones and transcriptional factors regulate CHC synthesis genes, leading to different CHC compositions. Future research focusing on the regulatory mechanisms underlying CHC biosynthesis can lead to a better understanding of how insects could produce dynamic chemical profiles in response to different stimuli.
{"title":"Regulation of insect cuticular hydrocarbon biosynthesis","authors":"Zinan Wang , Ignatius P Andika , Henry Chung","doi":"10.1016/j.cois.2024.101287","DOIUrl":"10.1016/j.cois.2024.101287","url":null,"abstract":"<div><div>Cuticular hydrocarbons (CHCs) play pleiotropic roles in insect survival and reproduction. They prevent desiccation and function as pheromones influencing different behaviors. While the genes in the CHC biosynthesis pathway have been extensively studied, the regulatory mechanisms that lead to different CHC compositions received far less attention. In this review, we present an overview of how different hormones and transcriptional factors regulate CHC synthesis genes, leading to different CHC compositions. Future research focusing on the regulatory mechanisms underlying CHC biosynthesis can lead to a better understanding of how insects could produce dynamic chemical profiles in response to different stimuli.</div></div>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"67 ","pages":"Article 101287"},"PeriodicalIF":5.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142496704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-24DOI: 10.1016/j.cois.2024.101286
Christian Wegener , Emad Amini , Javier Cavieres-Lepe , John Ewer
The circadian rhythm of adult emergence (aka eclosion) of the fruit fly Drosophila is a classic behavioural read-out that served in the first characterisation of the key features of circadian clocks and was also used for the identification of the first clock genes. Rhythmic eclosion requires the central clock in the brain, as well as a peripheral clock in the steroidogenic prothoracic gland. Here, we review recent findings on the timing and neuroendocrine coupling mechanisms of the two clocks. These findings identify rhythmic prothoracicotropic hormone and downstream ERK signalling as the main coupling pathway and show that the two clocks impose daily rhythmicity to the temporal pattern of eclosion by regulating the timing of the very last steps in metamorphosis.
{"title":"Neuronal and endocrine mechanisms underlying the circadian gating of eclosion: insights from Drosophila","authors":"Christian Wegener , Emad Amini , Javier Cavieres-Lepe , John Ewer","doi":"10.1016/j.cois.2024.101286","DOIUrl":"10.1016/j.cois.2024.101286","url":null,"abstract":"<div><div>The circadian rhythm of adult emergence (aka eclosion) of the fruit fly <em>Drosophila</em> is a classic behavioural read-out that served in the first characterisation of the key features of circadian clocks and was also used for the identification of the first clock genes. Rhythmic eclosion requires the central clock in the brain, as well as a peripheral clock in the steroidogenic prothoracic gland. Here, we review recent findings on the timing and neuroendocrine coupling mechanisms of the two clocks. These findings identify rhythmic prothoracicotropic hormone and downstream ERK signalling as the main coupling pathway and show that the two clocks impose daily rhythmicity to the temporal pattern of eclosion by regulating the timing of the very last steps in metamorphosis.</div></div>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101286"},"PeriodicalIF":5.8,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142516328","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-23DOI: 10.1016/j.cois.2024.101285
Enakshi Ghosh , Saskya van Nouhuys , Paul J Ode
Insect herbivore eco-immunology involves complex interactions between herbivore immunity and their natural enemies, and the responses of these interactions to environmental factors including plant anti-herbivore toxins. Plant toxins can affect herbivore immunity, leading to either immunoenhancement or immunosuppression, which in turn influences their vulnerability to parasitoids and pathogens. Herbivore immune responses differ among species regionally, reflecting adaptations to local environmental conditions and natural enemy pressures. Additionally, anthropogenic factors including like climate change, plant domestication, and invasive species are altering these eco-immunological dynamics. Such changes can ripple through food webs, affecting not only herbivores and their natural enemies but also broader community structures. By understanding these complex interactions, we can better predict ecosystem responses to environmental change.
{"title":"Anthropogenic effects on the eco-immunology of herbivorous insects","authors":"Enakshi Ghosh , Saskya van Nouhuys , Paul J Ode","doi":"10.1016/j.cois.2024.101285","DOIUrl":"10.1016/j.cois.2024.101285","url":null,"abstract":"<div><div>Insect herbivore eco-immunology involves complex interactions between herbivore immunity and their natural enemies, and the responses of these interactions to environmental factors including plant anti-herbivore toxins. Plant toxins can affect herbivore immunity, leading to either immunoenhancement or immunosuppression, which in turn influences their vulnerability to parasitoids and pathogens. Herbivore immune responses differ among species regionally, reflecting adaptations to local environmental conditions and natural enemy pressures. Additionally, anthropogenic factors including like climate change, plant domestication, and invasive species are altering these eco-immunological dynamics. Such changes can ripple through food webs, affecting not only herbivores and their natural enemies but also broader community structures. By understanding these complex interactions, we can better predict ecosystem responses to environmental change.</div></div>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101285"},"PeriodicalIF":5.8,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142516327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.cois.2024.101283
Zainulabeuddin Syed
{"title":"Editorial overview: Vectors and medical and veterinary entomology: an integrative view","authors":"Zainulabeuddin Syed","doi":"10.1016/j.cois.2024.101283","DOIUrl":"10.1016/j.cois.2024.101283","url":null,"abstract":"","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101283"},"PeriodicalIF":5.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142460101","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-18DOI: 10.1016/j.cois.2024.101284
Nicholas M Teets, Heath A MacMillan
{"title":"Editorial overview: Insect cold tolerance research reaches a Swift new Era","authors":"Nicholas M Teets, Heath A MacMillan","doi":"10.1016/j.cois.2024.101284","DOIUrl":"10.1016/j.cois.2024.101284","url":null,"abstract":"","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101284"},"PeriodicalIF":5.8,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142460100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amid concerns over chemical pesticide resistance and its associated environmental hazards, parasitoids offer an alternative long-term solution to manage insect pests in agriculture. India’s use of parasitoids in pest management has developed in tandem with the rest of the world, and this review summarizes the history of parasitoid-based biocontrol from the past to the present, focusing on problems such as climate adaptability, ecological compatibility, research-based advances, and policy-making. It focuses on successful classical, conservative, and augmentative techniques that form the foundation for implementing effective and sustainable biological control strategies involving parasitoids in India. The components that influence the efficiency of biocontrol activities, such as suitable phenological stages of parasitoids, field deployment techniques, quality assurance, environmental conditions, area-wide approaches, the need for sound habitat management, policy interventions, and public–private partnership are highlighted. Recent advancements in parasitoid mass production, quality control, and understanding competitive ecological interactions have provided prospects for designing effective parasitoid-centered biocontrol programs. The review presents historical breakthroughs in explaining how parasitoids help stabilize the agroecological dynamics that support sustainable food systems, primarily in India.
{"title":"Parasitoids as biocontrol agents in India","authors":"Sunil Kumaraswamy, Sindhura Kopparthi AV, Radhika Dattatraya H, Kamala Jayanthi Pagadala Damodaram","doi":"10.1016/j.cois.2024.101282","DOIUrl":"10.1016/j.cois.2024.101282","url":null,"abstract":"<div><div>Amid concerns over chemical pesticide resistance and its associated environmental hazards, parasitoids offer an alternative long-term solution to manage insect pests in agriculture. India’s use of parasitoids in pest management has developed in tandem with the rest of the world, and this review summarizes the history of parasitoid-based biocontrol from the past to the present, focusing on problems such as climate adaptability, ecological compatibility, research-based advances, and policy-making. It focuses on successful classical, conservative, and augmentative techniques that form the foundation for implementing effective and sustainable biological control strategies involving parasitoids in India. The components that influence the efficiency of biocontrol activities, such as suitable phenological stages of parasitoids, field deployment techniques, quality assurance, environmental conditions, area-wide approaches, the need for sound habitat management, policy interventions, and public–private partnership are highlighted. Recent advancements in parasitoid mass production, quality control, and understanding competitive ecological interactions have provided prospects for designing effective parasitoid-centered biocontrol programs. The review presents historical breakthroughs in explaining how parasitoids help stabilize the agroecological dynamics that support sustainable food systems, primarily in India.</div></div>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101282"},"PeriodicalIF":5.8,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142460102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-09DOI: 10.1016/j.cois.2024.101281
Peter Arvid Hambäck , Niklas Janz , Mariana Pires Braga
Parasitoid wasps may well be the most species-rich animal group on Earth, and host–parasitoid interactions may thereby be one of the most common types of species interactions. Understanding the major mechanisms underlying diversification in parasitoids should be a high priority, not the least in order to predict consequences from high extinction rates currently observed. The two major hypotheses explaining host-associated diversification are the escape-and-radiate hypothesis and the oscillation hypothesis, where the former assumes that key innovations are major drivers of radiation bursts, whereas the latter rather assumes that diversification depends on processes acting on the standing genetic variation that influences host use. This paper reviews the recent literature on parasitoid speciation in light of these major hypotheses to identify potential key innovations and host use variability underlying diversification. The paper also calls upon recent theoretical advances from a similar system, plant–butterfly interactions, to provide shortcuts in the development of theories explaining the high diversity of parasitoid wasps.
{"title":"Parasitoid speciation and diversification","authors":"Peter Arvid Hambäck , Niklas Janz , Mariana Pires Braga","doi":"10.1016/j.cois.2024.101281","DOIUrl":"10.1016/j.cois.2024.101281","url":null,"abstract":"<div><div>Parasitoid wasps may well be the most species-rich animal group on Earth, and host–parasitoid interactions may thereby be one of the most common types of species interactions. Understanding the major mechanisms underlying diversification in parasitoids should be a high priority, not the least in order to predict consequences from high extinction rates currently observed. The two major hypotheses explaining host-associated diversification are the escape-and-radiate hypothesis and the oscillation hypothesis, where the former assumes that key innovations are major drivers of radiation bursts, whereas the latter rather assumes that diversification depends on processes acting on the standing genetic variation that influences host use. This paper reviews the recent literature on parasitoid speciation in light of these major hypotheses to identify potential key innovations and host use variability underlying diversification. The paper also calls upon recent theoretical advances from a similar system, plant–butterfly interactions, to provide shortcuts in the development of theories explaining the high diversity of parasitoid wasps.</div></div>","PeriodicalId":11038,"journal":{"name":"Current opinion in insect science","volume":"66 ","pages":"Article 101281"},"PeriodicalIF":5.8,"publicationDate":"2024-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142399700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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