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Arp AP, Williamson ME, Vasquez M, Quintero G, Vargas Lowman A, Sagel A, Scott MJ. Doxycycline is a viable alternative to tetracycline for use in insect Tet-Off transgenic sexing systems, as assessed in the blowflies Cochliomyia hominivorax and Lucilia cuprina (Diptera: Calliphoridae). J Econ Entomol 2024; 117:650-659. [PMID: 38401129 DOI: 10.1093/jee/toae023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2023] [Revised: 01/24/2024] [Accepted: 01/30/2024] [Indexed: 02/26/2024]
Abstract
Transgenic insect strains with tetracycline repressible (Tet-Off) female-lethal genes provide significant advantages over traditional sterile insect techniques for insect population control, such as reduced diet and labor costs and more efficient population suppression. Tet-Off systems are suppressed by tetracycline-class antibiotics, most commonly tetracycline (Tc) or doxycycline (Dox), allowing for equal sex ratio colonies of transgenic insects when reared with Tc or Dox and male-only generations in their absence. Dox is a more stable molecule and has increased uptake than Tc, which could be advantageous in some insect mass-rearing systems. Here, we evaluated the suitability of Dox for rearing Tet-Off female-lethal strains of Australian sheep blowfly, Lucilia cuprina (Wiedemann, 1830) (Diptera: Calliphoridae), and New World screwworm, Cochliomyia hominivorax (Coquerel, 1858) (Diptera: Calliphoridae), and the effects of dosage on strain performance. For both species, colonies were able to be maintained with mixed-sex ratios at much lower dosages of Dox than Tc. Biological yields of C. hominivorax on either antibiotic were not significantly different. Reduction of Dox dosages in C. hominivorax diet did not affect biological performance, though rearing with 10 or 25 μg/mL was more productive than 50 μg/mL. Additionally, C. hominivorax mating performance and longevity were equal on all Dox dosages. Overall, Dox was a suitable antibiotic for mass-rearing Tet-Off female-lethal L. cuprina and C. hominivorax and was functional at much lower dosages than Tc.
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Affiliation(s)
- Alex P Arp
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory, Screwworm Research Site, Pacora, Panama
| | - Megan E Williamson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Mario Vasquez
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory, Screwworm Research Site, Pacora, Panama
| | - Gladys Quintero
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory, Screwworm Research Site, Pacora, Panama
| | - Aidamalia Vargas Lowman
- Department of Genetics and Molecular Biology, University of Panama, Panama City, Panama
- Panama-USA Program for the Eradicationand Control of Screwworm (COPEG), Pacora, Panama
| | - Agustin Sagel
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory, Screwworm Research Site, Pacora, Panama
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
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Yadav AK, Asokan R, Yamamoto A, Patil AA, Scott MJ. Expansion of the genetic toolbox for manipulation of the global crop pest Drosophila suzukii: Isolation and assessment of eye colour mutant strains. Insect Mol Biol 2024; 33:91-100. [PMID: 37819050 DOI: 10.1111/imb.12879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Accepted: 09/26/2023] [Indexed: 10/13/2023]
Abstract
Drosophila suzukii (Matsumura) (Diptera: Drosophilidae), commonly called spotted wing Drosophila, is an important agricultural pest recognised worldwide. D. suzukii is a pest of soft-skinned fruits as females can lay eggs in ripening fruit before harvest. While strains for genetic biocontrol of D. suzukii have been made, the development of transgenic D. suzukii strains and their further screening remain a challenge partly due to the lack of phenotypically trackable genetic-markers, such as those widely used with the model genetic organism D. melanogaster. Here, we have used CRISPR/Cas9 to introduce heritable mutations in the eye colour genes white, cinnabar and sepia, which are located on the X, second and third chromosomes, respectively. Strains were obtained, which were homozygous for a single mutation. Genotyping of the established strains showed insertion and/or deletions (indels) at the targeted sites. A strain homozygous for mutations in cinnabar and sepia showed a pale-yellow eye colour at eclosion but darkened to a sepia colour after a week. The fecundity and fertility of some of the cinnabar and sepia strains were comparable with the wild type. Although white mutant males were previously reported to be sterile, we found that sterility is not fully penetrant and we have been able to maintain white-eyed strains for over a year. The cinnabar, sepia and white mutant strains developed in this study should facilitate future genetic studies in D. suzukii and the development of strains for genetic control of this pest.
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Affiliation(s)
- Amarish K Yadav
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Ramasamy Asokan
- ICAR-Indian Institute of Horticultural Research, Bengaluru, Karnataka, India
| | - Akihiko Yamamoto
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Anandrao A Patil
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
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Novas R, Basika T, Williamson ME, Fresia P, Menchaca A, Scott MJ. Identification and functional analysis of Cochliomyia hominivorax U6 gene promoters. Insect Mol Biol 2023; 32:716-724. [PMID: 37732932 DOI: 10.1111/imb.12875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 08/04/2023] [Indexed: 09/22/2023]
Abstract
The New World screwworm, Cochliomyia hominivorax, is an obligate parasite, which is a major pest of livestock. While the sterile insect technique was used very successfully to eradicate C. hominivorax from North and Central America, more cost-effective genetic methods will likely be needed in South America. The recent development of CRISPR/Cas9-based genetic approaches, such as homing gene drive, could provide a very efficient means for the suppression of C. hominivorax populations. One component of a drive system is the guide RNA(s) driven by a U6 gene promoter. Here, we have developed an in vivo assay to evaluate the activity of the promoters from seven C. hominivorax U6 genes. Embryos from the related blowfly Lucilia cuprina were injected with plasmid DNA containing a U6-promoter-guide RNA construct and a source of Cas9, either protein or plasmid DNA. Activity was assessed by the number of site-specific mutations in the targeted gene in hatched larvae. One promoter, Chom U6_b, showed the highest activity. These U6 gene promoters could be used to build CRISPR/Cas9-based genetic systems for the control of C. hominivorax.
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Affiliation(s)
- Rossina Novas
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
- Pasteur+INIA Joint Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Tatiana Basika
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
- Pasteur+INIA Joint Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Megan E Williamson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Pablo Fresia
- Pasteur+INIA Joint Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Alejo Menchaca
- Plataforma de Investigación en Salud Animal, Instituto Nacional de Investigación Agropecuaria (INIA), Montevideo, Uruguay
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
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Yadav AK, Butler C, Yamamoto A, Patil AA, Lloyd AL, Scott MJ. CRISPR/Cas9-based split homing gene drive targeting doublesex for population suppression of the global fruit pest Drosophila suzukii. Proc Natl Acad Sci U S A 2023; 120:e2301525120. [PMID: 37307469 DOI: 10.1073/pnas.2301525120] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 05/04/2023] [Indexed: 06/14/2023] Open
Abstract
Genetic-based methods offer environmentally friendly species-specific approaches for control of insect pests. One method, CRISPR homing gene drive that target genes essential for development, could provide very efficient and cost-effective control. While significant progress has been made in developing homing gene drives for mosquito disease vectors, little progress has been made with agricultural insect pests. Here, we report the development and evaluation of split homing drives that target the doublesex (dsx) gene in Drosophila suzukii, an invasive pest of soft-skinned fruits. The drive component, consisting of dsx single guide RNA and DsRed genes, was introduced into the female-specific exon of dsx, which is essential for function in females but not males. However, in most strains, hemizygous females were sterile and produced the male dsx transcript. With a modified homing drive that included an optimal splice acceptor site, hemizygous females from each of the four independent lines were fertile. High transmission rates of the DsRed gene (94 to 99%) were observed with a line that expressed Cas9 with two nuclear localization sequences from the D. suzukii nanos promoter. Mutant alleles of dsx with small in-frame deletions near the Cas9 cut site were not functional and thus would not provide resistance to drive. Finally, mathematical modeling showed that the strains could be used for suppression of lab cage populations of D. suzukii with repeated releases at relatively low release ratios (1:4). Our results indicate that the split CRISPR homing gene drive strains could potentially provide an effective means for control of D. suzukii populations.
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Affiliation(s)
- Amarish K Yadav
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615
| | - Cole Butler
- Biomathematics Graduate Program and Department of Mathematics, North Carolina State University, Raleigh, NC 27615
| | - Akihiko Yamamoto
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615
| | - Anandrao A Patil
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615
| | - Alun L Lloyd
- Biomathematics Graduate Program and Department of Mathematics, North Carolina State University, Raleigh, NC 27615
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615
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Patil AA, Klobasa W, Espinoza-Rivera D, Baars O, Lorenzen MD, Scott MJ. Development of transgenic corn planthopper Peregrinus maidis that express the tetracycline transactivator. Insect Mol Biol 2023. [PMID: 36825366 DOI: 10.1111/imb.12836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Accepted: 02/17/2023] [Indexed: 05/20/2023]
Abstract
The corn planthopper, Peregrinus maidis, is a vector of several maize viruses and is consequently a significant agricultural pest in many tropical and subtropical regions. As P. maidis has developed resistance to insecticides, the aim of this study was to develop transgenic P. maidis strains that could be used for future genetic biocontrol programs. To facilitate the identification of transgenic P. maidis, we isolated and characterized the promoters for the P. maidis ubiquitin-like and profilin genes. Transient expression assays with P. maidis embryos showed that both promoters were active. Transgenic lines were established using piggyBac vectors and fluorescent protein marker genes. The lines carried an auto-regulated tetracycline transactivator (tTA) gene, which has been widely used to establish conditional lethal strains in other insect species. The transgenic lines showed low levels of tTA expression but were viable on diet with or without doxycycline, which inhibits the binding of tTA to DNA. We discuss possible modifications to the tTA overexpression system that could lead to the successful development of conditional lethal strains. To our knowledge, this is the first report of a transgenic Hemiptera. The approach we have taken could potentially be applied to other Hemiptera and, for P. maidis, the technology will facilitate future functional genomics studies.
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Affiliation(s)
- Anandrao A Patil
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
- Department of Biology, University of Washington, Seattle, Washington, USA
| | - William Klobasa
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Dina Espinoza-Rivera
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Oliver Baars
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Marcé D Lorenzen
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
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Tandonnet S, Krsticevic F, Basika T, Papathanos PA, Torres TT, Scott MJ. A chromosomal-scale reference genome of the New World Screwworm, Cochliomyia hominivorax. DNA Res 2022; 30:6825375. [PMID: 36370138 PMCID: PMC9835758 DOI: 10.1093/dnares/dsac042] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 09/23/2022] [Accepted: 11/10/2022] [Indexed: 11/13/2022] Open
Abstract
The New World Screwworm, Cochliomyia hominivorax (Calliphoridae), is the most important myiasis-causing species in America. Screwworm myiasis is a zoonosis that can cause severe lesions in livestock, domesticated and wild animals, and occasionally in people. Beyond the sanitary problems associated with this species, these infestations negatively impact economic sectors, such as the cattle industry. Here, we present a chromosome-scale assembly of C. hominivorax's genome, organized in 6 chromosome-length and 515 unplaced scaffolds spanning 534 Mb. There was a clear correspondence between the D. melanogaster linkage groups A-E and the chromosomal-scale scaffolds. Chromosome quotient (CQ) analysis identified a single scaffold from the X chromosome that contains most of the orthologs of genes that are on the D. melanogaster fourth chromosome (linkage group F or dot chromosome). CQ analysis also identified potential X and Y unplaced scaffolds and genes. Y-linkage for selected regions was confirmed by PCR with male and female DNA. Some of the long chromosome-scale scaffolds include Y-linked sequences, suggesting misassembly of these regions. These resources will provide a basis for future studies aiming at understanding the biology and evolution of this devastating obligate parasite.
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Affiliation(s)
- Sophie Tandonnet
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo (USP), São Paulo, SP 05508-090, Brazil
| | - Flavia Krsticevic
- Department of Entomology, Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Tatiana Basika
- Present address: Pasteur+INIA Joint Unit, Institut Pasteur de Montevideo, Mataojo 2020, CP 11400 Montevideo Uruguay
| | - Philippos A Papathanos
- Department of Entomology, Robert H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot 7610001, Israel
| | - Tatiana T Torres
- Departamento de Genética e Biologia Evolutiva, Instituto de Biociências, Universidade de São Paulo (USP), São Paulo, SP 05508-090, Brazil
| | - Maxwell J Scott
- To whom correspondence should be addressed. Tel: +1 919 515 0275; Fax: +1 919 515 7716.
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Yamamoto A, Yadav AK, Scott MJ. Evaluation of Additional Drosophila suzukii Male-Only Strains Generated Through Remobilization of an FL19 Transgene. Front Bioeng Biotechnol 2022; 10:829620. [PMID: 35372301 PMCID: PMC8965018 DOI: 10.3389/fbioe.2022.829620] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Accepted: 01/27/2022] [Indexed: 12/03/2022] Open
Abstract
Drosophila suzukii (D. suzukii) (Matsumura, 1931; Diptera: Drosophilidae), also known as spotted wing Drosophila, is a worldwide pest of fruits with soft skins such as blueberries and cherries. Originally from Asia, D. suzukii is now present in the Americas and Europe and has become a significant economic pest. Growers largely rely on insecticides for the control of D. suzukii. Genetic strategies offer a species-specific environmentally friendly way for suppression of D. suzukii populations. We previously developed a transgenic strain of D. suzukii that produced only males on a diet that did not contain tetracycline. The strain carried a single copy of the FL19 construct on chromosome 3. Repeated releases of an excess of FL19 males led to suppression of D. suzukii populations in laboratory cage trials. Females died as a consequence of overexpression of the tetracycline transactivator (tTA) and tTA-activated expression of the head involution defective proapoptotic gene. The aim of this study was to generate additional male-only strains that carried two copies of the FL19 transgene through crossing the original line with a piggyBac jumpstarter strain. Males that carried either two chromosome 3 or a singleX-linked transgene were identified through stronger expression of the red fluorescent protein marker gene. The brighter fluorescence of the X-linked lines was likely due to dosage compensation of the red fluorescent protein gene. In total, four X-linked lines and eleven lines with two copies on chromosome 3 were obtained, of which five were further examined. All but one of the strains produced only males on a diet without tetracycline. When crossed with wild type virgin females, all of the five two copy autosomal strains examined produced only males. However, the single copy X-linked lines did not show dominant female lethality. Five of the autosomal lines were further evaluated for productivity (egg to adult) and male competition. Based on these results, the most promising lines have been selected for future population suppression experiments with strains from different geographical locations.
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Abstract
Blowflies are of interest for medical applications (maggot therapy), forensic investigations, and for evolutionary developmental studies such as the evolution of parasitism. It is because of the latter that some blowflies such as the New World screwworm and the Australian sheep blowfly are considered major economic pests of livestock. Due to their importance, annotated assembled genomes for several species are now available. Here, we present a detailed guide for using the Streptococcus pyogenes Cas9 RNA-guided nuclease to efficiently generate both knockout and knock-in mutations in screwworm and sheep blowfly. These methods should accelerate genetic investigations in these and other closely related species and lead to a better understanding of the roles of selected genes in blowfly development and behavior.
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Affiliation(s)
- Daniel F Paulo
- Department of Plant and Environmental Protection Sciences (PEPS), The University of Hawai'i at Mānoa, Honolulu, HI, USA
| | - Megan E Williamson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA.
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Webster SH, Scott MJ. The Aedes aegypti (Diptera: Culicidae) hsp83 Gene Promoter Drives Strong Ubiquitous DsRed and ZsGreen Marker Expression in Transgenic Mosquitoes. J Med Entomol 2021; 58:2533-2537. [PMID: 34302473 DOI: 10.1093/jme/tjab128] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Indexed: 06/13/2023]
Abstract
Transgenic strains of the mosquito disease vector Aedes aegypti (L.) are being developed for population suppression or modification. Transgenic mosquitoes are identified using fluorescent protein genes. Here we describe DsRed and ZsGreen marker genes driven by the constitutive Ae. aegypti heat shock protein 83 (hsp83) promoter in transgenic mosquitoes. Transgenic larvae and pupae show strong full body expression of the red and green fluorescent proteins. This greatly assists in screening for transgenic individuals while making new or maintaining already established lines. Transient marker gene expression after embryo microinjection was readily visible in developing larvae allowing the separation of individuals that are more likely to produce transgenic offspring. The strongly expressed marker genes developed in this study should facilitate the detection of transgenic Ae. aegypti larvae or pupae in the field.
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Affiliation(s)
- Sophia H Webster
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
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Li F, Yamamoto A, Belikoff EJ, Berger A, Griffith EH, Scott MJ. A conditional female lethal system for genetic suppression of the global fruit crop pest Drosophila suzukii. Pest Manag Sci 2021; 77:4915-4922. [PMID: 34169646 DOI: 10.1002/ps.6530] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 06/24/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Drosophila suzukii (Matsumura, 1931, Diptera: Drosophilidae) is a global pest of soft-skinned fruits such as blueberries, cherries and raspberries. Also known as spotted-wing drosophila, D. suzukii is native to Asia but is now widely distributed in the Americas and Europe, and presents a serious challenge for growers. Genetic control strategies offer an environmentally friendly approach for the control of D. suzukii. RESULTS In this study, we developed transgenic strains of D. suzukii that carry dominant conditional female lethal transgenes. When raised in the absence of tetracycline, female D. suzukii die. We show that repeated releases of an excess of transgenic males can suppress D. suzukii populations in laboratory cage trials. CONCLUSION Our data suggest that the transgenic strain could provide an effective approach for control of this invasive pest of soft-skinned fruits.
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Affiliation(s)
- Fang Li
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Akihiko Yamamoto
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Esther J Belikoff
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Amy Berger
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Emily H Griffith
- Department of Statistics, North Carolina State University, Raleigh, NC, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
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Kandul NP, Belikoff EJ, Liu J, Buchman A, Li F, Yamamoto A, Yang T, Shriner I, Scott MJ, Akbari OS. Genetically Encoded CRISPR Components Yield Efficient Gene Editing in the Invasive Pest Drosophila suzukii. CRISPR J 2021; 4:739-751. [PMID: 34661429 DOI: 10.1089/crispr.2021.0032] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Originally from Asia, Drosophila suzukii Matsumura is a global pest of economically important soft-skinned fruits. Also commonly known as spotted wing drosophila, it is largely controlled through repeated applications of broad-spectrum insecticides by which resistance has been observed in the field. There is a pressing need for a better understanding of D. suzukii biology and for developing alternative environmentally friendly methods of control. The RNA-guided Cas9 nuclease has revolutionized functional genomics and is an integral component of several recently developed genetic strategies for population control of insects. Here, we describe genetically modified strains that encode three different terminators and four different promoters to express Cas9 robustly in both the soma and/or germline of D. suzukii. The Cas9 strains were rigorously evaluated through genetic crossing to transgenic strains that encode single-guide RNAs targeting the conserved X-linked yellow body and white eye genes. We find that several Cas9/gRNA strains display remarkably high editing capacity. Going forward, these tools will be instrumental for evaluating gene function in D. suzukii and may even provide tools useful for the development of new genetic strategies for control of this invasive species.
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Affiliation(s)
- Nikolay P Kandul
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
| | - Esther J Belikoff
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Junru Liu
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
| | - Anna Buchman
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
| | - Fang Li
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Akihiko Yamamoto
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Ting Yang
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
| | - Isaiah Shriner
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, North Carolina, USA
| | - Omar S Akbari
- Division of Biological Sciences, Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, California, USA; and North Carolina State University, Raleigh, North Carolina, USA
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Tait G, Mermer S, Stockton D, Lee J, Avosani S, Abrieux A, Anfora G, Beers E, Biondi A, Burrack H, Cha D, Chiu JC, Choi MY, Cloonan K, Crava CM, Daane KM, Dalton DT, Diepenbrock L, Fanning P, Ganjisaffar F, Gómez MI, Gut L, Grassi A, Hamby K, Hoelmer KA, Ioriatti C, Isaacs R, Klick J, Kraft L, Loeb G, Rossi-Stacconi MV, Nieri R, Pfab F, Puppato S, Rendon D, Renkema J, Rodriguez-Saona C, Rogers M, Sassù F, Schöneberg T, Scott MJ, Seagraves M, Sial A, Van Timmeren S, Wallingford A, Wang X, Yeh DA, Zalom FG, Walton VM. Drosophila suzukii (Diptera: Drosophilidae): A Decade of Research Towards a Sustainable Integrated Pest Management Program. J Econ Entomol 2021; 114:1950-1974. [PMID: 34516634 DOI: 10.1093/jee/toab158] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Indexed: 05/17/2023]
Abstract
Drosophila suzukii (Matsumura) (Diptera: Drosophilidae) also known as spotted-wing drosophila (SWD), is a pest native to Southeast Asia. In the last few decades, the pest has expanded its range to affect all major European and American fruit production regions. SWD is a highly adaptive insect that is able to disperse, survive, and flourish under a range of environmental conditions. Infestation by SWD generates both direct and indirect economic impacts through yield losses, shorter shelf life of infested fruit, and increased production costs. Fresh markets, frozen berries, and fruit export programs have been impacted by the pest due to zero tolerance for fruit infestation. As SWD control programs rely heavily on insecticides, exceedance of maximum residue levels (MRLs) has also resulted in crop rejections. The economic impact of SWD has been particularly severe for organic operations, mainly due to the limited availability of effective insecticides. Integrated pest management (IPM) of SWD could significantly reduce chemical inputs but would require substantial changes to horticultural management practices. This review evaluates the most promising methods studied as part of an IPM strategy against SWD across the world. For each of the considered techniques, the effectiveness, impact, sustainability, and stage of development are discussed.
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Affiliation(s)
- Gabriella Tait
- Department of Horticulture, Oregon State University, Corvallis, OR, USA
| | - Serhan Mermer
- Department of Horticulture, Oregon State University, Corvallis, OR, USA
| | - Dara Stockton
- USDA-ARS Daniel K. Inouye U.S. Pacific Basin Agricultural Research Center, Hilo, HI, USA
| | - Jana Lee
- USDA-ARS Horticultural Crops Research Unit, Corvallis, OR, USA
| | - Sabina Avosani
- Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - Antoine Abrieux
- Department of Entomology and Nematology, University of California, Davis, CA, USA
| | - Gianfranco Anfora
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
- Center Agriculture Food Environment, University of Trento, San Michele all'Adige, Trentino, Italy
| | - Elizabeth Beers
- Tree Fruit Research & Extension Center, Washington State University, Wenatchee, WA, USA
| | - Antonio Biondi
- Department of Agriculture, Food and Environment, University of Catania, Catania, Italy
| | - Hannah Burrack
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Dong Cha
- USDA-ARS Daniel K. Inouye U.S. Pacific Basin Agricultural Research Center, Hilo, HI, USA
| | - Joanna C Chiu
- Department of Entomology and Nematology, University of California, Davis, CA, USA
| | - Man-Yeon Choi
- USDA-ARS Horticultural Crops Research Unit, Corvallis, OR, USA
| | | | - Cristina M Crava
- Institute of Biotechnology and Biomedicine (BIOTECMED), University of Valencia, Valencia, Spain
| | - Kent M Daane
- Kearney Agricultural Research and Education Center, Parlier, CA, USA
- Department of Environmental Science, Policy & Management, University of California Berkeley, Berkeley, CA, USA
| | - Daniel T Dalton
- Faculty of Engineering & IT, Carinthia University of Applied Sciences, 9524, Villach, Austria
| | - Lauren Diepenbrock
- Citrus Research and Education Center, Entomology and Nematology Department, University of Florida, Lake Alfred, FL, USA
| | - Phillip Fanning
- USDA Economic Research Service, Market Trade and Economics Division, Kansas City, MO, USA
| | - Fatemeh Ganjisaffar
- Department of Entomology and Nematology, University of California, Davis, CA, USA
| | - Miguel I Gómez
- Dyson School of Applied Economics and Management, Cornell University, Ithaca, NY, USA
| | - Larry Gut
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | - Alberto Grassi
- Technology Transfer Center, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - Kelly Hamby
- Department of Entomology, University of Maryland, College Park, MD, USA
| | - Kim A Hoelmer
- USDA-ARS Beneficial Insects Introduction Research Unit, Newark, DE, USA
| | - Claudio Ioriatti
- Technology Transfer Center, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - Rufus Isaacs
- Department of Entomology, Michigan State University, East Lansing, MI, USA
| | | | - Laura Kraft
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | - Gregory Loeb
- Department of Entomology, Cornell AgriTech, Geneva, NY, USA
| | | | - Rachele Nieri
- Department of Civil, Environmental and Mechanical Engineering, University of Trento, Trento, Italy
- Research and Innovation Centre, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - Ferdinand Pfab
- Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, USA
| | - Simone Puppato
- Technology Transfer Center, Fondazione Edmund Mach, San Michele all'Adige, Italy
| | - Dalila Rendon
- Department of Horticulture, Oregon State University, Corvallis, OR, USA
| | - Justin Renkema
- London Research and Development Centre - Vineland Campus, Agriculture and Agri-Food Canada, Vineland, ON, Canada
| | | | - Mary Rogers
- Department of Horticultural Science, University of Minnesota, Saint Paul, MN, USA
| | - Fabiana Sassù
- Department of Forest and Soil Sciences, BOKU, University of Natural Resources and Life Sciences, Vienna, Austria
- Insect Pest Control Section, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Vienna, Austria
| | | | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC, USA
| | | | - Ashfaq Sial
- Department of Entomology, University of Georgia, Athens, GA, USA
| | | | - Anna Wallingford
- Department of Agriculture Nutrition and Food Systems, University of New Hampshire, Durham, NH, USA
| | - Xingeng Wang
- USDA-ARS Beneficial Insects Introduction Research Unit, Newark, DE, USA
| | - D Adeline Yeh
- USDA Economic Research Service, Market Trade and Economics Division, Kansas City, MO, USA
| | - Frank G Zalom
- Department of Entomology and Nematology, University of California, Davis, CA, USA
| | - Vaughn M Walton
- Department of Horticulture, Oregon State University, Corvallis, OR, USA
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13
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Davis RJ, Belikoff EJ, Dickey AN, Scholl EH, Benoit JB, Scott MJ. Genome and transcriptome sequencing of the green bottle fly, Lucilia sericata, reveals underlying factors of sheep flystrike and maggot debridement therapy. Genomics 2021; 113:3978-3988. [PMID: 34619342 DOI: 10.1016/j.ygeno.2021.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 09/03/2021] [Accepted: 10/01/2021] [Indexed: 12/13/2022]
Abstract
The common green bottle blow fly Lucilia sericata (family, Calliphoridae) is widely used for maggot debridement therapy, which involves the application of sterile maggots to wounds. The larval excretions and secretions are important for consuming necrotic tissue and inhibiting bacterial growth in wounds of patients. Lucilia sericata is also of importance as a pest of sheep and in forensic studies to estimate a postmortem interval. Here we report the assembly of a 565.3 Mb genome from long read PacBio DNA sequencing of genomic DNA. The genome contains 14,704 predicted protein coding genes and 1709 non-coding genes. Targeted annotation and transcriptional analyses identified genes that are highly expressed in the larval salivary glands (secretions) and Malpighian tubules (excretions) under normal growth conditions and following heat stress. The genomic resources will underpin future genetic studies and in development of engineered strains for genetic control of L. sericata and for biotechnology-enhanced maggot therapy.
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Affiliation(s)
- Rebecca J Davis
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Esther J Belikoff
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Allison N Dickey
- Bioinformatics Research Center, North Carolina State University, Campus Box 7566, Raleigh, NC 27695-7566, USA.
| | - Elizabeth H Scholl
- Bioinformatics Research Center, North Carolina State University, Campus Box 7566, Raleigh, NC 27695-7566, USA.
| | - Joshua B Benoit
- Department of Biological Sciences, University of Cincinnati, Cincinnati, OH 45211, USA.
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
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14
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Levy N, Quinlan J, El-Boghdadly K, Fawcett WJ, Agarwal V, Bastable RB, Cox FJ, de Boer HD, Dowdy SC, Hattingh K, Knaggs RD, Mariano ER, Pelosi P, Scott MJ, Lobo DN, Macintyre PE. An international multidisciplinary consensus statement on the prevention of opioid-related harm in adult surgical patients. Anaesthesia 2021; 76:520-536. [PMID: 33027841 DOI: 10.1111/anae.15262] [Citation(s) in RCA: 79] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/29/2020] [Indexed: 01/01/2023]
Abstract
This international multidisciplinary consensus statement was developed to provide balanced guidance on the safe peri-operative use of opioids in adults. An international panel of healthcare professionals evaluated the literature relating to postoperative opioid-related harm, including persistent postoperative opioid use; opioid-induced ventilatory impairment; non-medical opioid use; opioid diversion and dependence; and driving under the influence of prescription opioids. Recommended strategies to reduce harm include pre-operative assessment of the risk of persistent postoperative opioid use; use of an assessment of patient function rather than unidimensional pain scores alone to guide adequacy of analgesia; avoidance of long-acting (modified-release and transdermal patches) opioid formulations and combination analgesics; limiting the number of tablets prescribed at discharge; providing deprescribing advice; avoidance of automatic prescription refills; safe disposal of unused medicines; reducing the risk of opioid diversion; and better education of healthcare professionals, patients and carers. This consensus statement provides a framework for better prescribing practices that could help reduce the risk of postoperative opioid-related harm in adults.
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Affiliation(s)
- N Levy
- Department of Anaesthesia and Peri-operative Medicine, West Suffolk Hospital, Bury St. Edmunds, UK
| | - J Quinlan
- Nuffield Department of Anaesthetics, Oxford University Hospitals NHS Foundation Trust, Oxford, UK
| | - K El-Boghdadly
- Department of Anaesthesia, Guy's and St Thomas' NHS Foundation Trust, London, UK
- King's College London, London, UK
| | - W J Fawcett
- Department of Anaesthesia and Pain Medicine, Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK
| | - V Agarwal
- Department of Anaesthesia, Critical Care and Pain, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, Maharashtra, India
| | | | - F J Cox
- Pain Management Service, Critical Care and Anaesthesia, Royal Brompton and Harefield NHS Foundation Trust, London, UK
| | - H D de Boer
- Department of Anaesthesiology, Pain Medicine and Procedural Sedation and Analgesia, Martini General Hospital Groningen, Groningen, The Netherlands
| | - S C Dowdy
- Division of Gynecologic Oncology, Mayo Clinic, Rochester, MN, USA
| | - K Hattingh
- Bendigo Health, Bendigo, Victoria, Australia
| | - R D Knaggs
- School of Pharmacy, Pain Centre Versus Arthritis, University of Nottingham, Nottingham, UK
| | - E R Mariano
- Department of Anesthesiology, Peri-operative and Pain Medicine, Stanford University School of Medicine, Stanford, CA, USA
- Anesthesiology and Peri-operative Care Service, Veterans Affairs Palo Alto Health Care System, Palo Alto, CA, USA
| | - P Pelosi
- Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, Genoa, Italy
- IRCCS for Oncology and Neurosciences, San Martino Policlinico Hospital, Genoa, Italy
| | - M J Scott
- Anesthesiology and Critical Care Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - D N Lobo
- Gastrointestinal Surgery, Nottingham Digestive Diseases Centre, National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Queen's Medical Centre, Nottingham, UK
- David Greenfield Metabolic Physiology Unit, MRC Versus Arthritis Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, UK
| | - P E Macintyre
- Department of Anaesthesia, Pain Medicine and Hyperbaric Medicine, Royal Adelaide Hospital and University of Adelaide, Adelaide, South Australia, Australia
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15
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Abstract
Background The sterile insect technique (SIT) has been
successfully used in many pest management programs worldwide.
Some SIT programs release both sexes due to the lack of genetic
sexing strains or efficient sex separation methods but sterile
females are ineffective control agents. Transgenic sexing
strains (TSS) using the tetracycline-off control system have
been developed in a variety of insect pests, from which females
die by either of two commonly used lethal effectors:
overexpression of the transcription factor tetracycline transactivator (tTA)
or ectopic expression of a proapoptotic gene, such as head involution defective
(hid). The lethality from
tTA overexpression is thought to be due to “transcriptional
squelching”, while hid causes
lethality by induction of apoptosis. This study aims to create
and characterize a TSS of Lucilia
cuprina, which is a major pest of sheep, by
combining both lethal effectors in a single transgenic
strain. Results Here a stable TSS of L.
cuprina (DH6) that carries two lethal effectors
was successfully generated, by crossing FL3#2 which carries a
female-specific tTA overexpression cassette, with EF1#12 which
carries a tTA-regulated LshidAla2 cassette. Females with
one copy of the FL3#2 transgene are viable but up to 99.8% of
homozygous females die at the pupal stage when raised on diet
that lacks tetracycline. Additionally, the female lethality of
FL3#2 was partially repressed by supplying tetracycline to the
parental generation. With an additional LshidAla2 effector, the female
lethality of DH6 is 100% dominant and cannot be repressed by
maternal tetracycline. DH6 females die at the late-larval stage.
Several fitness parameters important for mass rearing such as
hatching rate, adult emergence and sex ratio were comparable to
those of the wild type strain. Conclusions Compared to the parental FL3#2 strain, the DH6
strain shows stronger female lethality and lethality occurs at
an earlier stage of development. The combination of two
tTA-dependent lethal effectors could improve strain stability
under mass rearing and could reduce the risk of resistance in
the field if fertile males are released. Our approach could be
easily adapted for other pest species for an efficient, safe and
sustainable genetic control program. Supplementary Information The online version contains supplementary material available
at 10.1186/s12863-020-00947-y.
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Affiliation(s)
- Ying Yan
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.,Department of Insect Biotechnology in Plant Protection, Justus-Liebig-University Giessen, Institute for Insect Biotechnology, Winchesterstraße 2, 35394, Giessen, Germany
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
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16
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Concha C, Yan Y, Arp A, Quilarque E, Sagel A, de León AP, McMillan WO, Skoda S, Scott MJ. An early female lethal system of the New World screwworm, Cochliomyia hominivorax, for biotechnology-enhanced SIT. BMC Genet 2020; 21:143. [PMID: 33339501 PMCID: PMC7747452 DOI: 10.1186/s12863-020-00948-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
BACKGROUND The New World Screwworm fly (NWS), Cochliomyia hominivorax, is an ectoparasite of warm-blooded animals and a major pest of livestock in parts of South America and the Caribbean where it remains endemic. In North and Central America it was eradicated using the Sterile Insect Technique (SIT). A control program is managed cooperatively between the governments of the United States and Panama to prevent the northward spread of NWS from infested countries in South America. This is accomplished by maintaining a permanent barrier through the release of millions of sterile male and female flies in the border between Panama and Colombia. Our research team demonstrated the utility of biotechnology-enhanced approaches for SIT by developing a male-only strain of the NWS. The strain carried a single component tetracycline repressible female lethal system where females died at late larval/pupal stages. The control program can be further improved by removing females during embryonic development as larval diet costs are significant. RESULTS The strains developed carry a two-component system consisting of the Lucilia sericata bottleneck gene promoter driving expression of the tTA gene and a tTA-regulated Lshid proapoptotic effector gene. Insertion of the sex-specifically spliced intron from the C. hominivorax transformer gene within the Lshid gene ensures that only females die when insects are reared in the absence of tetracycline. In several double homozygous two-component strains and in one "All-in-one" strain that had both components in a single construct, female lethality occurred at the embryonic and/or first instar larval stages when raised on diet without tetracycline. Laboratory evaluation for phenotypes that are relevant for mass rearing in a production facility revealed that most strains had fitness characteristics similar to the wild type J06 strain that is currently reared for release in the permanent barrier. Testing of an "All in one" strain under mass rearing conditions showed that the strain maintained the fitness characteristics observed in small-scale rearing. CONCLUSIONS The early female lethal strains described here could be selected by the NWS Control Program for testing at large scale in the production facility to enhance the efficiency of the NWS eradication program.
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Affiliation(s)
- Carolina Concha
- Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG), Pacora, Panama. .,Smithsonian Tropical Research Institute, Apartado 0843-03092, Panama City, Panama.
| | - Ying Yan
- Department for Insect Biotechnology in Plant Protection, Justus-Liebig-University Gießen, Winchesterstraße 2, 35394, Gießen, Germany
| | - Alex Arp
- USDA-ARS, Screwworm Research Site, Apartado 0816-07636, Pacora, Panama.,Knipling-Bushland U.S. Livestock Insects Research Laboratory, 2700 Fredericksburg Rd, Kerrville, TX, 78028, USA
| | - Evelin Quilarque
- USDA-ARS, Screwworm Research Site, Apartado 0816-07636, Pacora, Panama
| | - Agustin Sagel
- USDA-ARS, Screwworm Research Site, Apartado 0816-07636, Pacora, Panama
| | - Adalberto Pérez de León
- Knipling-Bushland U.S. Livestock Insects Research Laboratory, 2700 Fredericksburg Rd, Kerrville, TX, 78028, USA
| | - W Owen McMillan
- Smithsonian Tropical Research Institute, Apartado 0843-03092, Panama City, Panama
| | - Steven Skoda
- USDA-ARS, Screwworm Research Site, Apartado 0816-07636, Pacora, Panama.,Knipling-Bushland U.S. Livestock Insects Research Laboratory, 2700 Fredericksburg Rd, Kerrville, TX, 78028, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
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17
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Long KC, Alphey L, Annas GJ, Bloss CS, Campbell KJ, Champer J, Chen CH, Choudhary A, Church GM, Collins JP, Cooper KL, Delborne JA, Edwards OR, Emerson CI, Esvelt K, Evans SW, Friedman RM, Gantz VM, Gould F, Hartley S, Heitman E, Hemingway J, Kanuka H, Kuzma J, Lavery JV, Lee Y, Lorenzen M, Lunshof JE, Marshall JM, Messer PW, Montell C, Oye KA, Palmer MJ, Papathanos PA, Paradkar PN, Piaggio AJ, Rasgon JL, Rašić G, Rudenko L, Saah JR, Scott MJ, Sutton JT, Vorsino AE, Akbari OS. Core commitments for field trials of gene drive organisms. Science 2020; 370:1417-1419. [DOI: 10.1126/science.abd1908] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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18
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Yan Y, Scott MJ. Author Correction: A transgenic embryonic sexing system for the Australian sheep blow fly Lucilia cuprina. Sci Rep 2020; 10:6908. [PMID: 32313000 PMCID: PMC7170866 DOI: 10.1038/s41598-020-63126-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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19
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Pierce M, Gudowski SW, Roberts KJ, Scott MJ, Laudanski K. Establishing a Telemedicine Respiratory Therapy Service (eRT) in the COVID-19 Pandemic. J Cardiothorac Vasc Anesth 2020; 35:1268-1269. [PMID: 33288429 PMCID: PMC7659914 DOI: 10.1053/j.jvca.2020.11.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 11/06/2020] [Accepted: 11/09/2020] [Indexed: 11/11/2022]
Affiliation(s)
- M Pierce
- Department of Respiratory Care, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - S W Gudowski
- Department of Respiratory Care, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - K J Roberts
- Department of Respiratory Care, Hospital of the University of Pennsylvania, Philadelphia, PA
| | - M J Scott
- Department of Anesthesiology and Critical Care, Hospital of the University of Pennsylvania, Philadelphia, PA; Department of Connected Health, University of Pennsylvania Health System, Philadelphia, PA
| | - K Laudanski
- Department of Anesthesiology and Critical Care, Hospital of the University of Pennsylvania, Philadelphia, PA; Leonard Davis Institute for Health Economics, University of Pennsylvania, Philadelphia, PA.
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20
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Scott MJ, Benoit JB, Davis RJ, Bailey ST, Varga V, Martinson EO, Hickner PV, Syed Z, Cardoso GA, Torres TT, Weirauch MT, Scholl EH, Phillippy AM, Sagel A, Vasquez M, Quintero G, Skoda SR. Genomic analyses of a livestock pest, the New World screwworm, find potential targets for genetic control programs. Commun Biol 2020; 3:424. [PMID: 32753684 PMCID: PMC7403345 DOI: 10.1038/s42003-020-01152-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Accepted: 07/14/2020] [Indexed: 12/13/2022] Open
Abstract
The New World Screwworm fly, Cochliomyia hominivorax, is a major pest of livestock in South America and Caribbean. However, few genomic resources have been available for this species. A genome of 534 Mb was assembled from long read PacBio DNA sequencing of DNA from a highly inbred strain. Analysis of molecular evolution identified 40 genes that are likely under positive selection. Developmental RNA-seq analysis identified specific genes associated with each stage. We identify and analyze the expression of genes that are likely important for host-seeking behavior (chemosensory), development of larvae in open wounds in warm-blooded animals (heat shock protein, immune response) and for building transgenic strains for genetic control programs including gene drive (sex determination, germline). This study will underpin future experiments aimed at understanding the parasitic lifestyle of the screwworm fly and greatly facilitate future development of strains for efficient systems for genetic control of screwworm.
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Affiliation(s)
- Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
| | - Joshua B Benoit
- Department of Biological Sciences, University of Cincinnati, McMicken School of Arts and Sciences, Cincinnati, OH, 45221, USA
| | - Rebecca J Davis
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Samuel T Bailey
- Department of Biological Sciences, University of Cincinnati, McMicken School of Arts and Sciences, Cincinnati, OH, 45221, USA
| | - Virag Varga
- Department of Biological Sciences, University of Cincinnati, McMicken School of Arts and Sciences, Cincinnati, OH, 45221, USA
| | - Ellen O Martinson
- Department of Biology, University of New Mexico, Albuquerque, NM, 87131, USA
| | - Paul V Hickner
- Department of Entomology, University of Kentucky, Lexington, KY, 40546, USA
| | | | - Gisele A Cardoso
- Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brazil
| | - Tatiana T Torres
- Department of Genetics and Evolutionary Biology, University of São Paulo, São Paulo, Brazil
| | - Matthew T Weirauch
- Center for Autoimmune Genomics and Etiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
- Divisions of Biomedical Informatics and Developmental Biology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Elizabeth H Scholl
- Bioinformatics Research Center, North Carolina State University, Campus Box 7566, Raleigh, NC, 27695-7566, USA
| | - Adam M Phillippy
- Genome Informatics Section, Computational and Statistical Genomics Branch, National Human Genome Research Institute, Bethesda, MD, 20892, USA
| | | | | | | | - Steven R Skoda
- USDA-ARS, Tick and Biting Fly Research Unit, Knipling-Bushland Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX, 78028, USA
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21
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Webster SH, Vella MR, Scott MJ. Development and testing of a novel killer-rescue self-limiting gene drive system in Drosophila melanogaster. Proc Biol Sci 2020; 287:20192994. [PMID: 32292114 DOI: 10.1098/rspb.2019.2994] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Here we report the development and testing of a novel self-limiting gene drive system, Killer-Rescue (K-R), in Drosophila melanogaster. This system is composed of an autoregulated Gal4 Killer (K) and a Gal4-activated Gal80 Rescue (R). Overexpression of Gal4 is lethal, but in the presence of R activation of Gal80 leads to much lower levels of Gal4 and rescue of lethality. We demonstrate that with a single 2 : 1 engineered to wild-type release, K drives R through the population and after nine generations, more than 98% of the population carry R and less than 2% of the population are wild-type flies. We discuss how this simple K-R gene drive system may be readily adapted for population replacement in a human health pest, Aedes aegypti, or for population suppression in an agricultural pest, Drosophila suzukii.
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Affiliation(s)
- Sophia H Webster
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615, USA
| | - Michael R Vella
- Biomathematics Graduate Program, North Carolina State University, Raleigh, NC 27615, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC 27615, USA
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22
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Navarrete SB, Rothstein WB, Scott MJ. A commentary on "Preoperative pulmonary function tests do not predict the development of pulmonary complications after elective major abdominal surgery: A prospective cohort study" [Int J Surg 2019; Epub ahead of print]. Int J Surg 2019; 74:63-64. [PMID: 31891803 DOI: 10.1016/j.ijsu.2019.12.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Accepted: 12/20/2019] [Indexed: 11/25/2022]
Affiliation(s)
- S B Navarrete
- Department of Anesthesiology and Critical Care Medicine, Johns Hopkins Hospital, 600 N Wolfe St., Meyer 926, Baltimore, MD, 21287, United States.
| | - W B Rothstein
- Department of Surgery, Virginia Commonwealth University, 1200 East Broad Street, Richmond, VA, 23298, United States
| | - M J Scott
- Department of Anesthesiology and Critical Care, Virginia Commonwealth University, 1200 East Broad Street, Richmond, VA, 23298, United States; Department of Anesthesiology and Critical Care, Penn Medicine, 3400 Spruce Street, Suite 680 Dulles, Philadelphia, PA, 19104, United States
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Yan Y, Williamson ME, Davis RJ, Andere AA, Picard CJ, Scott MJ. Improved transgenic sexing strains for genetic control of the Australian sheep blow fly Lucilia cuprina using embryo-specific gene promoters. Mol Genet Genomics 2019; 295:287-298. [PMID: 31720776 DOI: 10.1007/s00438-019-01622-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 11/04/2019] [Indexed: 10/25/2022]
Abstract
For genetic approaches for controlling insect pests such as the sterile insect technique (SIT), it is advantageous to release only males as females are ineffective as control agents and they consume about 50% of the diet. Here we developed tetracycline-repressible Lucilia cuprina transgenic strains in which adult females were fully fertile and viable on a diet that lacked tetracycline and all of their female offspring died at the embryo stage. The transgenic strains are an improvement over the strains we developed previously, which had the disadvantage that adult females on diet without tetracycline were sterile and died prematurely. This was possibly due to the low level expression of the effector gene in ovaries. In the strains developed in this study, the early promoters from L. cuprina nullo or Cochliomyia macellaria CG14427 genes were used to drive the tetracycline transactivator (tTA) expression in the early embryo. In the absence of tetracycline, tTA activates expression of the proapoptotic gene Lshid which contains a female-specific intron. Consequently, only females produce active HID protein and die at the embryo stage. Crossing the tTA-expressing driver lines with an RFPex reporter line confirmed that there was no expression of the effector gene in the ovary. These new embryonic L. cuprina transgenic sexing strains hold great promise for genetic control programs and the system reported here might also be transferable to other major calliphorid livestock pests such as the New World screwworm, Cochliomyia hominivorax.
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Affiliation(s)
- Ying Yan
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.,Fraunhofer IME-BR, Winchesterstr. 2, 35394, Giessen, Germany
| | - Megan E Williamson
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Rebecca J Davis
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Anne A Andere
- Fraunhofer IME-BR, Winchesterstr. 2, 35394, Giessen, Germany
| | - Christine J Picard
- Department of Biology, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
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Rove KO, Brockel MA, Brindle ME, Scott MJ, Herndon CDA, Ljungqvist O, Koyle MA. Embracing change-the time for pediatric enhanced recovery after surgery is now. J Pediatr Urol 2019; 15:491-493. [PMID: 31109886 DOI: 10.1016/j.jpurol.2019.04.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 04/07/2019] [Indexed: 10/27/2022]
Affiliation(s)
- K O Rove
- Department of Pediatric Urology, Children's Hospital Colorado, University of Colorado 13123 E. 16th Avenue, B-463 Aurora, CO, USA.
| | - M A Brockel
- Department of Anesthesiology, Children's Hospital Colorado, University of Colorado, Aurora, CO, USA
| | - M E Brindle
- Department of Surgery, Alberta Children's Hospital, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - M J Scott
- Department of Anesthesiology, Virginia Commonwealth University Healthcare System, Richmond, VA, USA; Department of Anesthesiology and Critical Care Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - C D A Herndon
- Division of Urology, Children's Hospital of Richmond at VCU, Richmond, VA, USA
| | - O Ljungqvist
- Faculty of Medicine and Health, School of Health and Medical Sciences, Department of Surgery, Örebro University, Örebro, Sweden
| | - M A Koyle
- Division of Urology, The Hospital for Sick Children, Department of Surgery, University of Toronto, Toronto, Ontario, Canada
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Paulo DF, Williamson ME, Arp AP, Li F, Sagel A, Skoda SR, Sanchez-Gallego J, Vasquez M, Quintero G, Pérez de León AA, Belikoff EJ, Azeredo-Espin AML, McMillan WO, Concha C, Scott MJ. Specific Gene Disruption in the Major Livestock Pests Cochliomyia hominivorax and Lucilia cuprina Using CRISPR/Cas9. G3 (Bethesda) 2019; 9:3045-3055. [PMID: 31340950 PMCID: PMC6723136 DOI: 10.1534/g3.119.400544] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 07/23/2019] [Indexed: 02/07/2023]
Abstract
Cochliomyia hominivorax and Lucilia cuprina are major pests of livestock. Their larvae infest warm-blooded vertebrates and feed on host's tissues, resulting in severe industry losses. As they are serious pests, considerable effort has been made to develop genomic resources and functional tools aiming to improve their management and control. Here, we report a significant addition to the pool of genome manipulation tools through the establishment of efficient CRISPR/Cas9 protocols for the generation of directed and inheritable modifications in the genome of these flies. Site-directed mutations were introduced in the C hominivorax and L cuprina yellow genes (ChY and LcY) producing lightly pigmented adults. High rates of somatic mosaicism were induced when embryos were injected with Cas9 ribonucleoprotein complexes (RNPs) pre-assembled with guide RNAs (sgRNAs) at high concentrations. Adult flies carrying disrupted yellow alleles lacked normal pigmentation (brown body phenotype) and efficiently transmitted the mutated alleles to the subsequent generation, allowing the rapid creation of homozygous strains for reverse genetics of candidate loci. We next used our established CRISPR protocol to disrupt the C hominivorax transformer gene (Chtra). Surviving females carrying mutations in the Chtra locus developed mosaic phenotypes of transformed ovipositors with characteristics of male genitalia while exhibiting abnormal reproductive tissues. The CRISPR protocol described here is a significant improvement on the existing toolkit of molecular methods in calliphorids. Our results also suggest that Cas9-based systems targeting Chtra and Lctra could be an effective means for controlling natural populations of these important pests.
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Affiliation(s)
- Daniel F Paulo
- Centre for Molecular Biology and Genetic Engineering, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas
- Laboratory of Ecological and Evolutionary Genomics, Smithsonian Tropical Research Institute, Gamboa, Panama
| | - Megan E Williamson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh NC
| | - Alex P Arp
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Kerrville TX, and
| | - Fang Li
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh NC
| | - Agustin Sagel
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Screwworm Research Site, Pacora, Panama
| | - Steven R Skoda
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Screwworm Research Site, Pacora, Panama
| | - Joel Sanchez-Gallego
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Screwworm Research Site, Pacora, Panama
| | - Mario Vasquez
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Screwworm Research Site, Pacora, Panama
| | - Gladys Quintero
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Screwworm Research Site, Pacora, Panama
| | - Adalberto A Pérez de León
- USDA-ARS, Knipling-Bushland U.S. Livestock Insects Research Laboratory and Veterinary Pest Genomics Center, Kerrville TX, and
| | - Esther J Belikoff
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh NC
| | - Ana M L Azeredo-Espin
- Centre for Molecular Biology and Genetic Engineering, Department of Genetics, Evolution, Microbiology and Immunology, University of Campinas
| | - W Owen McMillan
- Laboratory of Ecological and Evolutionary Genomics, Smithsonian Tropical Research Institute, Gamboa, Panama
| | - Carolina Concha
- Laboratory of Ecological and Evolutionary Genomics, Smithsonian Tropical Research Institute, Gamboa, Panama
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh NC
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26
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Gustafsson UO, Scott MJ, Hubner M, Nygren J, Demartines N, Francis N, Rockall TA, Young-Fadok TM, Hill AG, Soop M, de Boer HD, Urman RD, Chang GJ, Fichera A, Kessler H, Grass F, Whang EE, Fawcett WJ, Carli F, Lobo DN, Rollins KE, Balfour A, Baldini G, Riedel B, Ljungqvist O. Guidelines for Perioperative Care in Elective Colorectal Surgery: Enhanced Recovery After Surgery (ERAS ®) Society Recommendations: 2018. World J Surg 2019; 43:659-695. [PMID: 30426190 DOI: 10.1007/s00268-018-4844-y] [Citation(s) in RCA: 936] [Impact Index Per Article: 187.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND This is the fourth updated Enhanced Recovery After Surgery (ERAS®) Society guideline presenting a consensus for optimal perioperative care in colorectal surgery and providing graded recommendations for each ERAS item within the ERAS® protocol. METHODS A wide database search on English literature publications was performed. Studies on each item within the protocol were selected with particular attention paid to meta-analyses, randomised controlled trials and large prospective cohorts and examined, reviewed and graded according to Grading of Recommendations, Assessment, Development and Evaluation (GRADE) system. RESULTS All recommendations on ERAS® protocol items are based on best available evidence; good-quality trials; meta-analyses of good-quality trials; or large cohort studies. The level of evidence for the use of each item is presented accordingly. CONCLUSIONS The evidence base and recommendation for items within the multimodal perioperative care pathway are presented by the ERAS® Society in this comprehensive consensus review.
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Affiliation(s)
- U O Gustafsson
- Department of Surgery, Danderyd Hospital and Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden.
| | - M J Scott
- Department of Anesthesia, Virginia Commonwealth University Hospital, Richmond, VA, USA
- Department of Anesthesiology, University of Pennsylvania, Philadelphia, USA
| | - M Hubner
- Department of Visceral Surgery, CHUV, Lausanne, Switzerland
| | - J Nygren
- Department of Surgery, Ersta Hospital and Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden
| | - N Demartines
- Department of Visceral Surgery, CHUV, Lausanne, Switzerland
| | - N Francis
- Colorectal Unit, Yeovil District Hospital, Higher Kingston, Yeovil, BA21 4AT, UK
- University of Bath, Wessex House Bath, BA2 7JU, UK
| | - T A Rockall
- Department of Surgery, Royal Surrey County Hospital NHS Trust, and Minimal Access Therapy Training Unit (MATTU), Guildford, UK
| | - T M Young-Fadok
- Division of Colon and Rectal Surgery, Department of Surgery, Mayo Clinic, Phoenix, AZ, USA
| | - A G Hill
- Department of Surgery, Faculty of Medical and Health Sciences, University of Auckland Middlemore Hospital, Auckland, New Zealand
| | - M Soop
- Irving National Intestinal Failure Unit, The University of Manchester, Manchester Academic Health Science Centre, Salford Royal NHS Foundation Trust, Manchester, UK
| | - H D de Boer
- Department of Anesthesiology, Pain Medicine and Procedural Sedation and Analgesia, Martini General Hospital, Groningen, The Netherlands
| | - R D Urman
- Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - G J Chang
- Department of Surgical Oncology and Department of Health Services Research, The University of Texas, MD Anderson Cancer Center, Houston, TX, USA
| | - A Fichera
- Division of Gastrointestinal Surgery, Department of Surgery, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - H Kessler
- Department of Colorectal Surgery, Digestive Disease Institute, Cleveland Clinic, Ohio, USA
| | - F Grass
- Department of Visceral Surgery, CHUV, Lausanne, Switzerland
| | - E E Whang
- Department of Surgery, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - W J Fawcett
- Department of Anaesthesia, Royal Surrey County Hospital NHS Foundation Trust and University of Surrey, Guildford, UK
| | - F Carli
- Department of Anesthesia, McGill University Health Centre, Montreal General Hospital, Montreal, QC, Canada
| | - D N Lobo
- Gastrointestinal Surgery, Nottingham Digestive Diseases Centre and National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK
| | - K E Rollins
- Gastrointestinal Surgery, Nottingham Digestive Diseases Centre and National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK
| | - A Balfour
- Department of Colorectal Surgery, Surgical Services, Western General Hospital, NHS Lothian, Edinburgh, UK
| | - G Baldini
- Department of Anesthesia, McGill University Health Centre, Montreal General Hospital, Montreal, QC, Canada
| | - B Riedel
- Department of Anaesthesia, Perioperative and Pain Medicine, Peter MacCallum Cancer Centre, University of Melbourne, Melbourne, Australia
| | - O Ljungqvist
- Department of Surgery, Örebro University and University Hospital, Örebro & Institute of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
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Davis RJ, Belikoff EJ, Scholl EH, Li F, Scott MJ. no blokes Is Essential for Male Viability and X Chromosome Gene Expression in the Australian Sheep Blowfly. Curr Biol 2018; 28:1987-1992.e3. [PMID: 29887311 DOI: 10.1016/j.cub.2018.05.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2018] [Revised: 03/19/2018] [Accepted: 05/02/2018] [Indexed: 12/30/2022]
Abstract
It has been hypothesized that the Drosophila 4th chromosome is derived from an ancient X chromosome [1]. In the Australian sheep blowfly, Lucilia cuprina, the heterochromatic X chromosome contains few active genes and orthologs of Drosophila X-linked genes are autosomal. Of 8 X-linked genes identified previously in L. cuprina, 6 were orthologs of Drosophila 4th-chromosome genes [2]. The X-linked genes were expressed equally in males and females. Here we identify an additional 51 X-linked genes and show that most are dosage compensated. Orthologs of 49 of the 59 X-linked genes are on the 4th chromosome in D. melanogaster. Because painting of fourth (Pof) is important for expression of Drosophila 4th-chromosome genes [3], we used Cas9 to make a loss-of-function knockin mutation in an L. cuprina Pof ortholog we call no blokes (nbl). Homozygous nbl males derived from homozygous nbl mothers die at the late pupal stage. Homozygous nbl females are viable, fertile, and live longer than heterozygous nbl females. RNA expression of most X-linked genes was reduced in homozygous nbl male pupae and to a lesser extent in nbl females compared to heterozygous siblings. The results suggest that NBL could be important for X chromosome dosage compensation in L. cuprina. NBL may also facilitate gene expression in the heterochromatic environment of the X chromosome in both sexes. This study supports the hypothesis on the origin of the Drosophila 4th chromosome and that a POF-like protein was required for normal gene expression on the ancient X chromosome.
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Affiliation(s)
- Rebecca J Davis
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA
| | - Esther J Belikoff
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA
| | - Elizabeth H Scholl
- Bioinformatics Research Center, North Carolina State University, Campus Box 7566, Raleigh, NC 27695-7566, USA
| | - Fang Li
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA
| | - Maxwell J Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
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Seenath MM, Scott MJ, Morris AI, Ellis A, Hershman MJ. Combined Surgical and Endoscopic Clearance of Small-Bowel Polyps in Peutz-Jeghers Syndrome. J R Soc Med 2017; 96:505-6. [PMID: 14519733 PMCID: PMC544636 DOI: 10.1177/014107680309601013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- M M Seenath
- Department of Surgery, Royal Liverpool University Hospital, Liverpool, UK
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29
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Dearden PK, Gemmell NJ, Mercier OR, Lester PJ, Scott MJ, Newcomb RD, Buckley TR, Jacobs JME, Goldson SG, Penman DR. The potential for the use of gene drives for pest control in New Zealand: a perspective. J R Soc N Z 2017. [DOI: 10.1080/03036758.2017.1385030] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Peter K. Dearden
- Genomics Aotearoa, Bioprotection Research Centre, and Biochemistry Department, University of Otago, Dunedin, Aotearoa New Zealand
| | - Neil J. Gemmell
- Anatomy Department, University of Otago, Dunedin, Aotearoa New Zealand
| | - Ocean R. Mercier
- Te Kawa a Māui—School of Māori Studies, Victoria University of Wellington, Wellington, Aotearoa New Zealand
| | - Philip J. Lester
- School of Biological Sciences, Victoria University of Wellington, Wellington, Aotearoa New Zealand
| | - Maxwell J. Scott
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, USA
| | - Richard D. Newcomb
- The New Zealand Institute for Plant & Food Research Ltd, Auckland, Aotearoa New Zealand
- School of Biological Sciences, University of Auckland, Auckland, Aotearoa New Zealand
| | - Thomas R. Buckley
- School of Biological Sciences, University of Auckland, Auckland, Aotearoa New Zealand
- Landcare Research Ltd, Auckland, Aotearoa New Zealand
| | - Jeanne M. E. Jacobs
- AgResearch, Lincoln Research Centre, Christchurch, Aotearoa New Zealand
- Bioprotection Research Centre, Lincoln University, Canterbury, Aotearoa New Zealand
| | - Stephen G. Goldson
- Bioprotection Research Centre, Lincoln University, Canterbury, Aotearoa New Zealand
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30
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Anstead CA, Batterham P, Korhonen PK, Young ND, Hall RS, Bowles VM, Richards S, Scott MJ, Gasser RB. A blow to the fly — Lucilia cuprina draft genome and transcriptome to support advances in biology and biotechnology. Biotechnol Adv 2016; 34:605-620. [DOI: 10.1016/j.biotechadv.2016.02.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 02/08/2016] [Accepted: 02/20/2016] [Indexed: 02/07/2023]
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Concha C, Palavesam A, Guerrero FD, Sagel A, Li F, Osborne JA, Hernandez Y, Pardo T, Quintero G, Vasquez M, Keller GP, Phillips PL, Welch JB, McMillan WO, Skoda SR, Scott MJ. A transgenic male-only strain of the New World screwworm for an improved control program using the sterile insect technique. BMC Biol 2016; 14:72. [PMID: 27576512 PMCID: PMC5004303 DOI: 10.1186/s12915-016-0296-8] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 08/10/2016] [Indexed: 11/17/2022] Open
Abstract
Background The New World screwworm, Cochliomyia hominivorax, is a devastating pest of livestock endemic to subtropical and tropical regions of the Western hemisphere. The larvae of this species feed on the tissue of living animals, including man, and can cause death if untreated. Over 60 years ago, the sterile insect technique (SIT) was developed with the aim of eradicating this pest, initially from Florida but subsequently from all of North and Central America. From the outset it was appreciated that SIT would be more efficient if only sterile males were released in the field, but this was not possible until now. Results Here, we report on the development and evaluation of the first sexing strains of C. hominivorax that produce only males when raised on diet without tetracycline. Transgenic lines have been developed that possess a tetracycline repressible female-lethal genetic system. Ten of these lines show high female lethality at the late larval/pupal stages and three of them present dominant female lethality. Most of the lines were comparable to the wild type parental strain in several fitness parameters that are relevant to mass rearing in a production facility. Further, three lines performed well in male mating success and male competition assays, suggesting they would be sexually competitive in the field. Consequently, one transgenic line has been selected by the New World Screwworm Program for evaluation under mass rearing conditions. Conclusions We conclude that the promising characteristics of the selected sexing strains may contribute to reduce production costs for the existing eradication program and provide more efficient population suppression, which should make a genetic control program more economical in regions were C. hominivorax remains endemic. Electronic supplementary material The online version of this article (doi:10.1186/s12915-016-0296-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Carolina Concha
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.,Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG), Pacora, Panama.,Smithsonian Tropical Research Institute, Naos Molecular Laboratory, Panama City, Panama
| | - Azhahianambi Palavesam
- USDA-ARS, Tick and Biting Fly Research Unit, Knipling-Bushland Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX, 78028, USA.,Present address: Department of Veterinary Parasitology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chennai, India
| | - Felix D Guerrero
- USDA-ARS, Tick and Biting Fly Research Unit, Knipling-Bushland Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX, 78028, USA
| | | | - Fang Li
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Jason A Osborne
- Department of Statistics, North Carolina State University, Campus Box 8203, Raleigh, NC, 27695-8203, USA
| | - Yillian Hernandez
- Panama-United States Commission for the Eradication and Prevention of Screwworm (COPEG), Pacora, Panama
| | | | | | | | | | - Pamela L Phillips
- USDA-ARS, Screwworm Research Unit, Pacora, Panama.,USDA-ARS, Screwworm Research Unit, Knipling-Bushland Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX, 78028, USA
| | - John B Welch
- USDA-APHIS, IS Action Programs, 2881 F&B Road, College Station, TX, 77845, USA
| | - W Owen McMillan
- Smithsonian Tropical Research Institute, Naos Molecular Laboratory, Panama City, Panama
| | - Steven R Skoda
- USDA-ARS, Screwworm Research Unit, Pacora, Panama.,USDA-ARS, Screwworm Research Unit, Knipling-Bushland Livestock Insects Research Laboratory, 2700 Fredericksburg Rd., Kerrville, TX, 78028, USA
| | - Maxwell J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
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32
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Linger RJ, Belikoff EJ, Yan Y, Li F, Wantuch HA, Fitzsimons HL, Scott MJ. Towards next generation maggot debridement therapy: transgenic Lucilia sericata larvae that produce and secrete a human growth factor. BMC Biotechnol 2016; 16:30. [PMID: 27006073 PMCID: PMC4804476 DOI: 10.1186/s12896-016-0263-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2015] [Accepted: 03/17/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Diabetes and its concurrent complications impact a significant proportion of the population of the US and create a large financial burden on the American health care system. FDA-approved maggot debridement therapy (MDT), the application of sterile laboratory-reared Lucilia sericata (green bottle fly) larvae to wounds, is a cost-effective and successful treatment for diabetic foot ulcers and other medical conditions. Human platelet derived growth factor-BB (PDGF-BB) is a secreted dimeric peptide growth factor that binds the PDGF receptor. PDGF-BB stimulates cell proliferation and survival, promotes wound healing, and has been investigated as a possible topical treatment for non-healing wounds. Genetic engineering has allowed for expression and secretion of human growth factors and other proteins in transgenic insects. Here, we present a novel concept in MDT technology that combines the established benefits of MDT with the power of genetic engineering to promote healing. The focus of this study is to create and characterize strains of transgenic L. sericata that express and secrete PDGF-BB at detectable levels in adult hemolymph, whole larval lysate, and maggot excretions/ secretions (ES), with potential for clinical utility in wound healing. RESULTS We have engineered and confirmed transgene insertion in several strains of L. sericata that express human PDGF-BB. Using a heat-inducible promoter to control the pdgf-b gene, pdgf-b mRNA was detected via semi-quantitative PCR upon heat shock. PDGF-BB protein was also detectable in larval lysates and adult hemolymph but not larval ES. An alternative, tetracycline-repressible pdgf-b system mediated expression of pdgf-b mRNA when maggots were raised on diet that lacked tetracycline. Further, PDGF-BB protein was readily detected in whole larval lysate as well as larval ES. CONCLUSIONS Here we show robust, inducible expression and production of human PDGF-BB protein from two conditional expression systems in transgenic L. sericata larvae. The tetracycline-repressible system appears to be the most promising as PDGF-BB protein was detectable in larval ES following induction. Our system could potentially be used to deliver a variety of growth factors and anti-microbial peptides to the wound environment with the aim of enhancing wound healing, thereby improving patient outcome in a cost-effective manner.
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Affiliation(s)
- Rebecca J Linger
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Esther J Belikoff
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Ying Yan
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Fang Li
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Holly A Wantuch
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA
| | - Helen L Fitzsimons
- Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Maxwell J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613, USA.
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Li F, Scott MJ. CRISPR/Cas9-mediated mutagenesis of the white and Sex lethal loci in the invasive pest, Drosophila suzukii. Biochem Biophys Res Commun 2015; 469:911-6. [PMID: 26721433 DOI: 10.1016/j.bbrc.2015.12.081] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 12/18/2015] [Indexed: 02/07/2023]
Abstract
Drosophila suzukii (commonly called spotted wing Drosophila) is an invasive pest of soft-skinned fruit (e.g. blueberries, strawberries). A high quality reference genome sequence is available but functional genomic tools, such as used in Drosophila melanogaster, remain to be developed. In this study we have used the CRISPR/Cas9 system to introduce site-specific mutations in the D. suzukii white (w) and Sex lethal (Sxl) genes. Hemizygous males with w mutations develop white eyes and the mutant genes are transmissible to the next generation. Somatic mosaic females that carry mutations in the Sxl gene develop abnormal genitalia and reproductive tissue. The D. suzukii Sxl gene could be an excellent target for a Cas9-mediated gene drive to suppress populations of this highly destructive pest.
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Affiliation(s)
- Fang Li
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh 27695-7613, NC, USA
| | - Maxwell J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh 27695-7613, NC, USA.
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Yan Y, Scott MJ. A transgenic embryonic sexing system for the Australian sheep blow fly Lucilia cuprina. Sci Rep 2015; 5:16090. [PMID: 26537204 PMCID: PMC4633611 DOI: 10.1038/srep16090] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 10/07/2015] [Indexed: 11/09/2022] Open
Abstract
Genetic approaches, including the sterile insect technique (SIT), have previously been considered for control of the Australian sheep blow fly Lucilia cuprina, a major pest of sheep. In an SIT program, females consume 50% of the diet but are ineffective as control agents and compete with females in the field for mating with sterile males, thereby decreasing the efficiency of the program. Consequently, transgenic sexing strains of L. cuprina were developed that produce 100% males when raised on diet that lacks tetracycline. However, as females die mostly at the pupal stage, rearing costs would not be significantly reduced. Here we report the development of transgenic embryonic sexing strains of L. cuprina. In these strains, the Lsbnk cellularization gene promoter drives high levels of expression of the tetracycline transactivator (tTA) in the early embryo. In the absence of tetracycline, tTA activates expression of the Lshid proapoptotic gene, leading to death of the embryo. Sex-specific RNA splicing of Lshid transcripts ensures that only female embryos die. Embryonic sexing strains were also made by combining the Lsbnk-tTA and tetO-Lshid components into a single gene construct, which will facilitate transfer of the technology to other major calliphorid livestock pests.
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Affiliation(s)
- Ying Yan
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613
| | - Maxwell J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695-7613
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Linger RJ, Belikoff EJ, Scott MJ. Dosage Compensation of X-Linked Muller Element F Genes but Not X-Linked Transgenes in the Australian Sheep Blowfly. PLoS One 2015; 10:e0141544. [PMID: 26506426 PMCID: PMC4624761 DOI: 10.1371/journal.pone.0141544] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 10/10/2015] [Indexed: 11/25/2022] Open
Abstract
In most animals that have X and Y sex chromosomes, chromosome-wide mechanisms are used to balance X-linked gene expression in males and females. In the fly Drosophila melanogaster, the dosage compensation mechanism also generally extends to X-linked transgenes. Over 70 transgenic lines of the Australian sheep blowfly Lucilia cuprina have been made as part of an effort to develop male-only strains for a genetic control program of this major pest of sheep. All lines carry a constitutively expressed fluorescent protein marker gene. In all 12 X-linked lines, female larvae show brighter fluorescence than male larvae, suggesting the marker gene is not dosage compensated. This has been confirmed by quantitative RT-PCR for selected lines. To determine if endogenous X-linked genes are dosage compensated, we isolated 8 genes that are orthologs of genes that are on the fourth chromosome in D. melanogaster. Recent evidence suggests that the D. melanogaster fourth chromosome, or Muller element F, is the ancestral X chromosome in Diptera that has reverted to an autosome in Drosophila species. We show by quantitative PCR of male and female DNA that 6 of the 8 linkage group F genes reside on the X chromosome in L. cuprina. The other two Muller element F genes were found to be autosomal in L. cuprina, whereas two Muller element B genes were found on the same region of the X chromosome as the L. cuprina orthologs of the D. melanogaster Ephrin and gawky genes. We find that the L. cuprina X chromosome genes are equally expressed in males and females (i.e., fully dosage compensated). Thus, unlike in Drosophila, it appears that the Lucilia dosage compensation system is specific for genes endogenous to the X chromosome and cannot be co-opted by recently arrived transgenes.
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Affiliation(s)
- Rebecca J. Linger
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
| | - Esther J. Belikoff
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
| | - Maxwell J. Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC, 27695–7613, United States of America
- * E-mail:
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Hunsicker O, Scott MJ, Miller TE, Baldini G, Feldheiser A. Gastrointestinal morbidity as primary outcome measure in studies comparing crystalloid and colloid within a goal-directed therapy. Br J Anaesth 2015; 115:128-9. [PMID: 26089448 DOI: 10.1093/bja/aev181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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Edman RM, Linger RJ, Belikoff EJ, Li F, Sze SH, Tarone AM, Scott MJ. Functional characterization of calliphorid cell death genes and cellularization gene promoters for controlling gene expression and cell viability in early embryos. Insect Mol Biol 2015; 24:58-70. [PMID: 25225046 DOI: 10.1111/imb.12135] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The New World screwworm fly, Cochliomyia hominivorax, and the Australian sheep blow fly, Lucilia cuprina, are major pests of livestock. The sterile insect technique was used to eradicate C. hominivorax from North and Central America. This involved area-wide releases of male and female flies that had been sterilized by radiation. Genetic systems have been developed for making 'male-only' strains that would improve the efficiency of genetic control of insect pests. One system involves induction of female lethality in embryos through activation of a pro-apoptotic gene by the tetracycline-dependent transactivator. Sex-specific expression is achieved using an intron from the transformer gene, which we previously isolated from several calliphorids. In the present study, we report the isolation of the promoters from the C. hominivorax slam and Lucilia sericata bnk cellularization genes and show that these promoters can drive expression of a GFP reporter gene in early embryos of transgenic L. cuprina. Additionally, we report the isolation of the L. sericata pro-apoptotic hid and rpr genes, identify conserved motifs in the encoded proteins and determine the relative expression of these genes at different stages of development. We show that widespread expression of the L. sericata pro-apoptotic genes was lethal in Drosophila melanogaster. The isolated gene promoters and pro-apoptotic genes could potentially be used to build transgenic embryonic sexing strains of calliphorid livestock pests.
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Affiliation(s)
- R M Edman
- Department of Genetics, North Carolina State University, Raleigh, NC, USA
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Lobo DN, Fearon KCH, Scott MJ, Ljungqvist O. [Enhanced recovery after elective colorectal surgery: reply]. ACTA ACUST UNITED AC 2014; 33:712-3. [PMID: 25464911 DOI: 10.1016/j.annfar.2014.10.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 10/20/2014] [Indexed: 11/25/2022]
Affiliation(s)
- D N Lobo
- Nottingham Digestive Diseases Centre, Nottingham University Hospitals, Queen's Medical Centre, Nottingham NG7 2UH, Royaume-Uni.
| | - K C H Fearon
- Nottingham Digestive Diseases Centre, Nottingham University Hospitals, Queen's Medical Centre, Nottingham NG7 2UH, Royaume-Uni
| | - M J Scott
- Nottingham Digestive Diseases Centre, Nottingham University Hospitals, Queen's Medical Centre, Nottingham NG7 2UH, Royaume-Uni
| | - O Ljungqvist
- Nottingham Digestive Diseases Centre, Nottingham University Hospitals, Queen's Medical Centre, Nottingham NG7 2UH, Royaume-Uni
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Abstract
The Australian sheep blowfly Lucilia cuprina (Wiedemann) is a major pest of sheep in Australia and New Zealand. From the 1960s to the 1980s there was a major effort to develop "field female killing" or FFK strains of L. cuprina that could be used for a cost-effective genetic control program. The FFK strains carried eye color mutations that were lethal to females in the field but not under conditions in the mass rearing facility. Males did not die in the field as normal copies of the eye color genes had been translocated to the Y chromosome and an autosome. Although the FFK strains showed some promise in field tests, a genetic control program in mainland Australia was never implemented for several reasons including instability of the FFK strains during mass rearing. A stable transgenic strain of L. cuprina that carried one or more dominant repressible female lethal genes offered the potential for efficient genetic control of blowfly populations. Here I review our research on tetracycline-repressible female lethal genetic systems, Lucilia germ-line transformation and sex determination genes that ultimately led to the successful development of transgenic "male-only" strains of L. cuprina. The technology developed for L. cuprina should be directly transferable to other blowfly livestock pests including L. sericata and the New World and Old World screwworm. 29
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Sandeman RM, Levot GW, Heath ACG, James PJ, Greeff JC, Scott MJ, Batterham P, Bowles VM. Control of the sheep blowfly in Australia and New Zealand--are we there yet? Int J Parasitol 2014; 44:879-91. [PMID: 25240442 DOI: 10.1016/j.ijpara.2014.08.009] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Revised: 08/07/2014] [Accepted: 08/11/2014] [Indexed: 01/18/2023]
Abstract
The last 50 years of research into infections in Australia and New Zealand caused by larvae of the sheep blowfly, Lucilia cuprina, have significantly advanced our understanding of this blowfly and its primary host, the sheep. However, apart from some highly effective drugs it could be argued that no new control methodologies have resulted. This review addresses the major areas of sheep blowfly research over this period describing the significant outcomes and analyses, and what is still required to produce new commercial control technologies. The use of drugs against this fly species has been very successful but resistance has developed to almost all current compounds. Integrated pest management is becoming basic to control, especially in the absence of mulesing, and has clearly benefited from computer-aided technologies. Biological control has more challenges but natural and perhaps transformed biopesticides offer possibilities for the future. Experimental vaccines have been developed but require further analysis of antigens and formulations to boost protection. Genetic technologies may provide potential for long-term control through more rapid indirect selection of sheep less prone to flystrike. Finally in the future, genetic analysis of the fly may allow suppression and perhaps eradication of blowfly populations or identification of new and more viable targets for drug and vaccine intervention. Clearly all these areas of research offer potential new controls but commercial development is perhaps inhibited by the success of current chemical insecticides and certainly requires a significant additional injection of resources.
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Affiliation(s)
- R M Sandeman
- School of Applied and Biomedical Sciences, Federation University, Churchill, Gippsland, Vic. 3842, Australia.
| | - G W Levot
- Elizabeth Macarthur Agricultural Institute, NSW Department of Primary Industries, Woodbridge Road, Menangle, NSW 2568, Australia
| | - A C G Heath
- AgResearch Ltd., c/o MPI, National Centre for Biosecurity and Infectious Disease, P.O. Box 4072, Upper Hutt 5018, New Zealand
| | - P J James
- Queensland Alliance for Agriculture and Food Innovation, University of Queensland, Dutton Park, Qld 4102, Australia
| | - J C Greeff
- Department of Agriculture and Food Western Australia, 3 Baron Hay Court, South Perth, WA 6151, Australia
| | - M J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA
| | - P Batterham
- Department of Genetics, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Vic. 3010, Australia
| | - V M Bowles
- Centre for Animal Biotechnology, School of Veterinary Science, University of Melbourne, Vic. 3010, Australia
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Li F, Wantuch HA, Linger RJ, Belikoff EJ, Scott MJ. Transgenic sexing system for genetic control of the Australian sheep blow fly Lucilia cuprina. Insect Biochem Mol Biol 2014; 51:80-88. [PMID: 24928635 DOI: 10.1016/j.ibmb.2014.06.001] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 05/29/2014] [Accepted: 06/01/2014] [Indexed: 06/03/2023]
Abstract
The New World screwworm and the Australian sheep blowfly Lucilia cuprina are devastating pests of livestock. The larvae of these species feed on the tissue of the living animal and can cause death if untreated. The sterile insect technique or SIT was used to eradicate screwworm from North and Central America. This inspired efforts to develop strains containing complex chromosomal rearrangements for genetic control of L. cuprina in Australia. Although one field trial was promising, the approach was abandoned due to costs and difficulties in mass rearing the strain. As the efficiency of SIT can be significantly increased if only sterile males are released, we have developed transgenic strains of L. cuprina that carry a dominant tetracycline repressible female lethal genetic system. Lethality is due to overexpression of an auto-regulated tetracycline repressible transactivator (tTA) gene and occurs mostly at the pupal stage. Dominant female lethality was achieved by replacing the Drosophila hsp70 core promoter with a Lucilia hsp70 core promoter-5'UTR for tTA overexpression. The strains carry a dominant strongly expressed marker that will facilitate identification in the field. Interestingly, the sexes could be reliably sorted by fluorescence or color from the early first instar larval stage as females that overexpress tTA also overexpress the linked marker gene. Male-only strains of L. cuprina developed in this study could form the basis for a future genetic control program. Moreover, the system developed for L. cuprina should be readily transferrable to other major calliphorid livestock pests including the New and Old World screwworm.
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Affiliation(s)
- Fang Li
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Holly A Wantuch
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Rebecca J Linger
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Esther J Belikoff
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
| | - Maxwell J Scott
- Department of Entomology, North Carolina State University, Campus Box 7613, Raleigh, NC 27695-7613, USA.
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Xu J, Jiang Y, Wang J, Shi X, Liu Q, Liu Z, Li Y, Scott MJ, Xiao G, Li S, Fan L, Billiar TR, Wilson MA, Fan J. Macrophage endocytosis of high-mobility group box 1 triggers pyroptosis. Cell Death Differ 2014; 21:1229-39. [PMID: 24769733 DOI: 10.1038/cdd.2014.40] [Citation(s) in RCA: 171] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2013] [Revised: 02/22/2014] [Accepted: 03/05/2014] [Indexed: 01/08/2023] Open
Abstract
Macrophages can be activated and regulated by high-mobility group box 1 (HMGB1), a highly conserved nuclear protein. Inflammatory functions of HMGB1 are mediated by binding to cell surface receptors, including the receptor for advanced glycation end products (RAGE), Toll-like receptor (TLR)2, TLR4, and TLR9. Pyroptosis is a caspase-1-dependent programmed cell death, which features rapid plasma membrane rupture, DNA fragmentation, and release of proinflammatory intracellular contents. Pyroptosis can be triggered by various stimuli, however, the mechanism underlying pyroptosis remains unclear. In this study, we identify a novel pathway of HMGB1-induced macrophage pyroptosis. We demonstrate that HMGB1, acting through RAGE and dynamin-dependent signaling, initiates HMGB1endocytosis, which in turn induces cell pyroptosis. The endocytosis of HMGB1 triggers a cascade of molecular events, including cathepsin B release from ruptured lysosomes followed by pyroptosome formation and caspase-1 activation. We further confirm that HMGB1-induced macrophage pyroptosis also occurs in vivo during endotoxemia, suggesting a pathophysiological significance for this form of pyroptosis in the development of inflammation. These findings shed light on the regulatory role of ligand-receptor internalization in directing cell fate, which may have an important role in the progress of inflammation following infection and injury.
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Affiliation(s)
- J Xu
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Y Jiang
- Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - J Wang
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - X Shi
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Department of Pharmacology, Medical College of Xi'an Jiaotong University, Xi'an, China
| | - Q Liu
- 1] Department of Surgery, Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Department of Cardiovascular Surgery, Second Affiliated Hospital of Harbin Medical University, Harbin, China
| | - Z Liu
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Department of Pathophysiology, Southern Medical University, Guangzhou, China
| | - Y Li
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - M J Scott
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - G Xiao
- Department of Biochemistry, Rush University Medical Center, Chicago, IL, USA
| | - S Li
- Center for Pharmacogenetics, Department of Pharmaceutical Sciences, University of Pittsburgh School of Pharmacy, Pittsburgh, PA, USA
| | - L Fan
- University of Pittsburgh School of Arts and Science, Pittsburgh, PA, USA
| | - T R Billiar
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
| | - M A Wilson
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] Research and Development, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, USA
| | - J Fan
- 1] Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA [2] McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA [3] Research and Development, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA, USA
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Abstract
A growing body of research indicates that pharmacological inhibition of histone deacetylases (HDACs) correlates with enhancement of long-term memory and current research is concentrated on determining the roles that individual HDACs play in cognitive function. Here, we investigate the role of HDAC4 in long-term memory formation in Drosophila. We show that overexpression of HDAC4 in the adult mushroom body, an important structure for memory formation, resulted in a specific impairment in long-term courtship memory, but had no affect on short-term memory. Overexpression of an HDAC4 catalytic mutant also abolished LTM, suggesting a mode of action independent of catalytic activity. We found that overexpression of HDAC4 resulted in a redistribution of the transcription factor MEF2 from a relatively uniform distribution through the nucleus into punctate nuclear bodies, where it colocalized with HDAC4. As MEF2 has also been implicated in regulation of long-term memory, these data suggest that the repressive effects of HDAC4 on long-term memory may be through interaction with MEF2. In the same genetic background, we also found that RNAi-mediated knockdown of HDAC4 impairs long-term memory, therefore we demonstrate that HDAC4 is not only a repressor of long-term memory, but also modulates normal memory formation.
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Affiliation(s)
- Helen L. Fitzsimons
- Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
- * E-mail:
| | - Silvia Schwartz
- Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Fiona M. Given
- Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
| | - Maxwell J. Scott
- Department of Entomology, North Carolina State University, Raleigh, North Carolina, United States of America
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Gustafsson UO, Scott MJ, Schwenk W, Demartines N, Roulin D, Francis N, McNaught CE, Macfie J, Liberman AS, Soop M, Hill A, Kennedy RH, Lobo DN, Fearon K, Ljungqvist O. Guidelines for perioperative care in elective colonic surgery: Enhanced Recovery After Surgery (ERAS(®)) Society recommendations. World J Surg 2013; 37:259-84. [PMID: 23052794 DOI: 10.1007/s00268-012-1772-0] [Citation(s) in RCA: 804] [Impact Index Per Article: 73.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Jones C, Kelliher L, Dickinson M, Riga A, Worthington T, Scott MJ, Vandrevala T, Fry CH, Karanjia N, Quiney N. Randomized clinical trial on enhanced recovery versus standard care following open liver resection. Br J Surg 2013; 100:1015-24. [PMID: 23696477 DOI: 10.1002/bjs.9165] [Citation(s) in RCA: 197] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2013] [Indexed: 12/11/2022]
Abstract
BACKGROUND Enhanced recovery programmes (ERPs) have been shown to reduce length of hospital stay (LOS) and complications in colorectal surgery. Whether ERPs have the same benefits in open liver resection surgery is unclear, and randomized clinical trials are lacking. METHODS Consecutive patients scheduled for open liver resection were randomized to an ERP group or standard care. Primary endpoints were time until medically fit for discharge (MFD) and LOS. Secondary endpoints were postoperative morbidity, pain scores, readmission rate, mortality, quality of life (QoL) and patient satisfaction. ERP elements included greater preoperative education, preoperative oral carbohydrate loading, postoperative goal-directed fluid therapy, early mobilization and physiotherapy. Both groups received standardized anaesthesia with epidural analgesia. RESULTS The analysis included 46 patients in the ERP group and 45 in the standard care group. Median MFD time was reduced in the ERP group (3 days versus 6 days with standard care; P < 0·001), as was LOS (4 days versus 7 days; P < 0·001). The ERP significantly reduced the rate of medical complications (7 versus 27 per cent; P = 0·020), but not surgical complications (15 versus 11 per cent; P = 0·612), readmissions (4 versus 0 per cent; P = 0·153) or mortality (both 2 per cent; P = 0·987). QoL over 28 days was significantly better in the ERP group (P = 0·002). There was no difference in patient satisfaction. CONCLUSION ERPs for open liver resection surgery are safe and effective. Patients treated in the ERP recovered faster, were discharged sooner, and had fewer medical-related complications and improved QoL. REGISTRATION NUMBER ISRCTN03274575 (http://www.controlled-trials.com).
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Affiliation(s)
- C Jones
- Department of Anaesthesia, Royal Surrey County Hospital NHS Foundation Trust, Guildford, UK.
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Li F, Vensko SP, Belikoff EJ, Scott MJ. Conservation and sex-specific splicing of the transformer gene in the calliphorids Cochliomyia hominivorax, Cochliomyia macellaria and Lucilia sericata. PLoS One 2013; 8:e56303. [PMID: 23409170 PMCID: PMC3567074 DOI: 10.1371/journal.pone.0056303] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2012] [Accepted: 01/10/2013] [Indexed: 01/16/2023] Open
Abstract
Transformer (TRA) promotes female development in several dipteran species including the Australian sheep blowfly Lucilia cuprina, the Mediterranean fruit fly, housefly and Drosophila melanogaster. tra transcripts are sex-specifically spliced such that only the female form encodes full length functional protein. The presence of six predicted TRA/TRA2 binding sites in the sex-specific female intron of the L. cuprina gene suggested that tra splicing is auto-regulated as in medfly and housefly. With the aim of identifying conserved motifs that may play a role in tra sex-specific splicing, here we have isolated and characterized the tra gene from three additional blowfly species, L. sericata, Cochliomyia hominivorax and C. macellaria. The blowfly adult male and female transcripts differ in the choice of splice donor site in the first intron, with males using a site downstream of the site used in females. The tra genes all contain a single TRA/TRA2 site in the male exon and a cluster of four to five sites in the male intron. However, overall the sex-specific intron sequences are poorly conserved in closely related blowflies. The most conserved regions are around the exon/intron junctions, the 3′ end of the intron and near the cluster of TRA/TRA2 sites. We propose a model for sex specific regulation of tra splicing that incorporates the conserved features identified in this study. In L. sericata embryos, the male tra transcript was first detected at around the time of cellular blastoderm formation. RNAi experiments showed that tra is required for female development in L. sericata and C. macellaria. The isolation of the tra gene from the New World screwworm fly C. hominivorax, a major livestock pest, will facilitate the development of a “male-only” strain for genetic control programs.
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Affiliation(s)
- Fang Li
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Steven P. Vensko
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Esther J. Belikoff
- Department of Entomology, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Maxwell J. Scott
- Department of Genetics, North Carolina State University, Raleigh, North Carolina, United States of America
- * E-mail:
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Gustafsson UO, Scott MJ, Schwenk W, Demartines N, Roulin D, Francis N, McNaught CE, MacFie J, Liberman AS, Soop M, Hill A, Kennedy RH, Lobo DN, Fearon K, Ljungqvist O. Guidelines for perioperative care in elective colonic surgery: Enhanced Recovery After Surgery (ERAS®) Society recommendations. Clin Nutr 2012; 31:783-800. [PMID: 23099039 DOI: 10.1016/j.clnu.2012.08.013] [Citation(s) in RCA: 441] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 08/19/2012] [Indexed: 12/16/2022]
Abstract
BACKGROUND This review aims to present a consensus for optimal perioperative care in colonic surgery and to provide graded recommendations for items for an evidenced-based enhanced perioperative protocol. METHODS Studies were selected with particular attention paid to meta-analyses, randomised controlled trials and large prospective cohorts. For each item of the perioperative treatment pathway, available English-language literature was examined, reviewed and graded. A consensus recommendation was reached after critical appraisal of the literature by the group. RESULTS For most of the protocol items, recommendations are based on good-quality trials or meta-analyses of good-quality trials (quality of evidence and recommendations according to the GRADE system). CONCLUSIONS Based on the evidence available for each item of the multimodal perioperative-care pathway, the Enhanced Recovery After Surgery (ERAS) Society, International Association for Surgical Metabolism and Nutrition (IASMEN) and European Society for Clinical Nutrition and Metabolism (ESPEN) present a comprehensive evidence-based consensus review of perioperative care for colonic surgery.
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Affiliation(s)
- U O Gustafsson
- Department of Surgery, Ersta Hospital, Stockholm, Sweden.
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Concha C, Edman RM, Belikoff EJ, Schiemann AH, Carey B, Scott MJ. Organization and expression of the Australian sheep blowfly (Lucilia cuprina) hsp23, hsp24, hsp70 and hsp83 genes. Insect Mol Biol 2012; 21:169-180. [PMID: 22506286 DOI: 10.1111/j.1365-2583.2011.01123.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study we report the isolation and characterization of a heat shock protein 70 (hsp70) gene, the hsp83 gene and two genes that encode small Hsps (Lchsp23 and Lchsp24) from the Australian sheep blowfly, Lucilia cuprina, a major agricultural pest. Phylogenetic analyses indicate that the LcHsp23 protein is the orthologue of Drosophila melanogaster Hsp23 and LcHsp24 is the orthologue of Sarcophaga crassipalpis Hsp23. Quantitative reverse-transcriptase PCR analysis showed that the basal level of Lchsp83 RNA is relatively high at all developmental stages and only moderately induced by heat shock. In contrast, Lchsp70 transcripts are present at low levels and strongly induced by heat shock at all stages. The basal levels of expression and degrees of heat induction of the Lchsp23 and Lchsp24 transcripts were more variable across the different developmental stages. Putative heat shock factor binding sites were identified in the Lchsp24, Lchsp70 and Lchsp83 gene promoters. The isolation of these hsp gene promoters will facilitate constitutive or conditional expression of a gene of interest in transgenic Lucilia.
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Affiliation(s)
- C Concha
- Institute of Molecular BioSciences, Massey University, Palmerston North, New Zealand
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Sze SH, Dunham JP, Carey B, Chang PL, Li F, Edman RM, Fjeldsted C, Scott MJ, Nuzhdin SV, Tarone AM. A de novo transcriptome assembly of Lucilia sericata (Diptera: Calliphoridae) with predicted alternative splices, single nucleotide polymorphisms and transcript expression estimates. Insect Mol Biol 2012; 21:205-221. [PMID: 22283785 DOI: 10.1111/j.1365-2583.2011.01127.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The blow fly Lucilia sericata (Diptera: Calliphoridae) (Meigen) is a nonmodel organism with no reference genome that is associated with numerous areas of research spanning the ecological, evolutionary, medical, veterinary and forensic sciences. To facilitate scientific discovery in this species, the transcriptome was assembled from more than six billion bases of Illumina and twenty-one million bases of 454 sequence derived from embryonic, larval, pupal, adult and larval salivary gland libraries. The assembly was carried out in a manner that enabled identification of putative single nucleotide polymorphisms (SNPs) and alternative splices, and that provided expression estimates for various life history stages and for salivary tissue. The assembled transcriptome was also used to identify transcribed transposable elements in L. sericata. The results of this study will enable blow fly biologists, dipterists and comparative genomicists to more rapidly develop and test molecular and genetic hypotheses, especially those regarding blow fly development and salivary gland biology.
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Affiliation(s)
- S-H Sze
- Department of Computer Science and Engineering, Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA
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Stasiuk SJ, Scott MJ, Grant WN. Developmental plasticity and the evolution of parasitism in an unusual nematode, Parastrongyloides trichosuri. EvoDevo 2012; 3:1. [PMID: 22214222 PMCID: PMC3293006 DOI: 10.1186/2041-9139-3-1] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2011] [Accepted: 01/03/2012] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Parasitism is an important life history strategy in many metazoan taxa. This is particularly true of the Phylum Nematoda, in which parasitism has evolved independently at least nine times. The apparent ease with which parasitism has evolved amongst nematodes may, in part, be due to a feature of nematode development acting as a pre-adaptation for the transition from a free-living to a parasitic life history. One candidate pre-adaptive feature for evolution in terrestrial nematodes is the dauer larva, a developmentally arrested morph formed in response to environmental signals. RESULTS We investigated the role of dauer development in the nematode, Parastrongyloides trichosuri, which has retained a complete free-living life cycle in addition to a life cycle as a mammalian gastrointestinal parasite. We show that the developmental switch between these life histories is sensitive to the same environmental cues as dauer arrest in free-living nematodes, including sensitivity to a chemical cue produced by the free-living stages. Furthermore, we show that genetic variation for the sensitivity of the cue(s) exists in natural populations of P. trichosuri, such that we derived inbred lines that were largely insensitive to the cue and other lines that were supersensitive to the cue. CONCLUSIONS For this parasitic clade, and perhaps more widely in the phylum, the evolution of parasitism co-opted the dauer switch of a free-living ancestor. This lends direct support to the hypothesis that the switch to developmental arrest in the dauer larva acted as a pre-adaptation for the evolution of parasitism, and suggests that the sensory transduction machinery downstream of the cue may have been similarly co-opted and modified.
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Affiliation(s)
- Susan J Stasiuk
- AgResearch Limited, Hopkirk Research Institute, Private Bag 11008, Palmerston North, New Zealand
- University of Calgary, Department of Comparative Biology and Experimental Medicine, Calgary, T2N 4N1 Alberta, Canada
| | - Maxwell J Scott
- North Carolina State University, Department of Genetics, Campus Box 7614 Raleigh, 27695-7614, USA
| | - Warwick N Grant
- AgResearch Limited, Hopkirk Research Institute, Private Bag 11008, Palmerston North, New Zealand
- La Trobe University, Genetics Department, Bundoora, 3086 Victoria, Australia
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