Name: pupal and adult injections for rnai and crispr gene editing in nasonia vitripennis
Uploaded: 2020-12-04T14:00:00
Description: Watch this Scientific Journal Video about Pupal and Adult Injections for RNAi and CRISPR Gene Editing in Nasonia vitripennis at JoVE.com

Este trabajo fue apoyado en parte por los fondos de inicio de UCSD dirigidos a O.S.A. y NSF / BIO 1645331 de subvenciones a J.L.R.

1. Cría de Nasonia
<ol><li>Configure ~ 20 hembras apareadas singularmente en pequeños tubos de ensayo de vidrio tapados con algodón. NOTA: Para reducir el espacio de cría, los tubos de 10 x 85 cm, 4 mL son óptimos. Las hembras se distinguen fácilmente de los machos debido a las alas más grandes y la presencia del ovipositor (Figura 1A). Los protocolos detallados para la cría de N. vitripennis también se pueden encontrar en otrasliteraturas 13,<s...

<ol>
	<li>Verhulst, E. C., Beukeboom, L. W., van de Zande, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Maternal+control+of+haplodiploid+sex+determination+in+the+wasp+Nasonia.">Maternal control of haplodiploid sex determination in the wasp Nasonia.</a> Science. 328 (5978), 620-623 (2010).</li><li>Verhulst, E. C., Lynch, J. A., Bopp, D., Beukeboom, L. W., van de Zande, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+new+component+of+the+Nasonia+sex+determining+cascade+is+maternally+silenced+and+regulates+transformer+expression.">A new component of the Nasonia sex determining cascade is maternally silenced and regulates transformer expression.</a> PloS One. 8 (5), 63618 (2013).</li><li>Dalla Benetta, E., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome+elimination+mediated+by+gene+expression+from+a+selfish+chromosome.">Genome elimination mediated by gene expression from a selfish chromosome.</a> Science Advances. 6 (14), (2020).</li><li>Aldrich, J. C., Leibholz, A., Cheema, M. S., Ausi&#972;, J., Ferree, P. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+"selfish"+B+chromosome+induces+genome+elimination+by+disrupting+the+histone+code+in+the+jewel+wasp+Nasonia+vitripennis.">A "selfish" B chromosome induces genome elimination by disrupting the histone code in the jewel wasp Nasonia vitripennis.</a> Scientific Reports. 7, 42551 (2017).</li><li>Ferree, P. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+genes+uniquely+expressed+in+the+germ-line+tissues+of+the+jewel+wasp+Nasonnia+vitripennis.">Identification of genes uniquely expressed in the germ-line tissues of the jewel wasp Nasonnia vitripennis.</a> G3. 3 (12), 2647-2653 (2015).</li><li>Akbari, O. S., Antoshechkin, I., Hay, B. A., Ferree, P. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transcriptome+profiling+of+Nasonia+vitripennis+testis+reveals+novel+transcripts+expressed+from+the+selfish+B+chromosome,+paternal+sex+ratio.">Transcriptome profiling of Nasonia vitripennis testis reveals novel transcripts expressed from the selfish B chromosome, paternal sex ratio.</a> G3. 3 (9), 1597-1605 (2013).</li><li>Dalla Benetta, E., Beukeboom, L. W., van de Zande, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Adaptive+differences+in+circadian+clock+gene+expression+patterns+and+photoperiodic+diapause+induction+in+Nasonia+vitripennis.">Adaptive differences in circadian clock gene expression patterns and photoperiodic diapause induction in Nasonia vitripennis.</a> The American Naturalist. 193 (6), 881-896 (2019).</li><li>Paolucci, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Latitudinal+variation+in+circadian+rhythmicity+in+Nasonia+vitripennis.">Latitudinal variation in circadian rhythmicity in Nasonia vitripennis.</a> Behavioral Sciences. 9 (11), (2019).</li><li>Werren, J. H., Loehlin, D. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+parasitoid+wasp+Nasonia:+an+emerging+model+system+with+haploid+male+genetics.">The parasitoid wasp Nasonia: an emerging model system with haploid male genetics.</a> Cold Spring Harbor Protocols. 2009 (10), (2009).</li><li>Lynch, J. A., Desplan, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+method+for+parental+RNA+interference+in+the+wasp+Nasonia+vitripennis.">A method for parental RNA interference in the wasp Nasonia vitripennis.</a> Nature Protocols. 1 (1), 486-494 (2006).</li><li>Li, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Generation+of+heritable+germline+mutations+in+the+jewel+wasp+Nasonia+vitripennis+using+CRISPR/Cas9.">Generation of heritable germline mutations in the jewel wasp Nasonia vitripennis using CRISPR/Cas9.</a> Scientific Reports. 7 (1), 901 (2017).</li><li>Chaverra-Rodriguez, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Germline+mutagenesis+of+Nasonia+vitripennis+through+ovarian+delivery+of+CRISPR-Cas9+ribonucleoprotein.">Germline mutagenesis of Nasonia vitripennis through ovarian delivery of CRISPR-Cas9 ribonucleoprotein.</a> Insect Molecular Biology. , (2020).</li><li>Li, M., Bui, M., Akbari, O. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Embryo+microinjection+and+transplantation+technique+for+Nasonia+vitripennis+genome+manipulation.">Embryo microinjection and transplantation technique for Nasonia vitripennis genome manipulation.</a> Journal of Visualized Experiments. (130), (2017).</li><li>Werren, J. H., Loehlin, D. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rearing+Sarcophaga+bullata+fly+hosts+for+Nasonia+(Parasitoid+Wasp).">Rearing Sarcophaga bullata fly hosts for Nasonia (Parasitoid Wasp).</a> Cold Spring Harbor Protocols. 2009 (10), (2009).</li><li>Werren, J. H., Loehlin, D. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Strain+maintenance+of+Nasonia+vitripennis+(Parasitoid+Wasp).">Strain maintenance of Nasonia vitripennis (Parasitoid Wasp).</a> Cold Spring Harbor Protocols. 2009 (10), (2009).</li><li>Beukeboom, L. W., van de Zande, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genetics+of+sex+determination+in+the+haplodiploid+wasp+Nasonia+vitripennis+(Hymenoptera:+Chalcidoidea).">Genetics of sex determination in the haplodiploid wasp Nasonia vitripennis (Hymenoptera: Chalcidoidea).</a> Journal of Genetics. 89 (3), 333-339 (2010).</li><li>Leung, K., van de Zande, L., Beukeboom, L. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Life-history+traits+of+the+Whiting+polyploid+line+of+the+parasitoid.">Life-history traits of the Whiting polyploid line of the parasitoid.</a> Entomologia experimentalis et applicata. 167 (7), 655-669 (2019).</li><li>Kennerdell, J. R., Carthew, R. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+dsRNA-mediated+genetic+interference+to+demonstrate+that+frizzled+and+frizzled+2+act+in+the+wingless+pathway.">Use of dsRNA-mediated genetic interference to demonstrate that frizzled and frizzled 2 act in the wingless pathway.</a> Cell. 95 (7), 1017-1026 (1998).</li><li>Yang, J., Zhao-jun, H. A. N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Efficiency+of+different+methods+for+dsrna+delivery+in+cotton+bollworm+(Helicoverpa+armigera).">Efficiency of different methods for dsrna delivery in cotton bollworm (Helicoverpa armigera).</a> Journal of Integrative Agriculture. 13 (1), 115-123 (2014).</li><li>Brown, S., Holtzman, S., Kaufman, T., Denell, R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+the+Tribolium+Deformed+ortholog+and+its+ability+to+directly+regulate+Deformed+target+genes+in+the+rescue+of+a+Drosophila+Deformed+null+mutant.">Characterization of the Tribolium Deformed ortholog and its ability to directly regulate Deformed target genes in the rescue of a Drosophila Deformed null mutant.</a> Development Genes and Evolution. 209 (7), 389-398 (1999).</li><li>Hughes, C. L., Kaufman, T. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=RNAi+analysis+of+Deformed,+proboscipedia+and+Sex+combs+reduced+in+the+milkweed+bug+Oncopeltus+fasciatus:+novel+roles+for+Hox+genes+in+the+hemipteran+head.">RNAi analysis of Deformed, proboscipedia and Sex combs reduced in the milkweed bug Oncopeltus fasciatus: novel roles for Hox genes in the hemipteran head.</a> Development. 127 (17), 3683-3694 (2000).</li><li>Dzitoyeva, S., Dimitrijevic, N., Manev, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Intra-abdominal+injection+of+double-stranded+RNA+into+anesthetized+adult+Drosophila+triggers+RNA+interference+in+the+central+nervous+system.">Intra-abdominal injection of double-stranded RNA into anesthetized adult Drosophila triggers RNA interference in the central nervous system.</a> Molecular Psychiatry. 6 (6), 665-670 (2001).</li><li>Chaverra-Rodriguez, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeted+delivery+of+CRISPR-Cas9+ribonucleoprotein+into+arthropod+ovaries+for+heritable+germline+gene+editing.">Targeted delivery of CRISPR-Cas9 ribonucleoprotein into arthropod ovaries for heritable germline gene editing.</a> Nature Communications. 9 (1), 3008 (2018).</li><li>Macias, V. M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cas9-mediated+gene-editing+in+the+malaria+mosquito+anopheles+stephensi+by+ReMOT+control.">Cas9-mediated gene-editing in the malaria mosquito anopheles stephensi by ReMOT control.</a> G3. 10 (4), 1353-1360 (2020).</li><li>Heu, C. C., McCullough, F. M., Luan, J., Rasgon, J. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CRISPR/Cas9-based+genome+editing+in+the+silverleaf+whitefly+(Bemisia+tabaci).">CRISPR/Cas9-based genome editing in the silverleaf whitefly (Bemisia tabaci).</a> CRISPR Journal. 3 (2), 89-96 (2020).</li><li>Shirai, Y., Daimon, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mutations+in+cardinal+are+responsible+for+the+red-1+and+peach+eye+color+mutants+of+the+red+flour+beetle+Tribolium+castaneum.">Mutations in cardinal are responsible for the red-1 and peach eye color mutants of the red flour beetle Tribolium castaneum.</a> Biochemical and Biophysical Research Communications. 529 (2), 372-378 (2020).</li><li>Hunter, W. B., Gonzalez, M. T., Tomich, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=BAPC-assisted+CRISPR/Cas9+system:+targeted+delivery+into+adult+ovaries+for+heritable+germline+gene+editing+(Arthropoda:+Hemiptera).">BAPC-assisted CRISPR/Cas9 system: targeted delivery into adult ovaries for heritable germline gene editing (Arthropoda: Hemiptera).</a> bioRxiv. , 478743 (2018).</li><li>Chaverra Rodriguez, D., Bui, M., Li, M., Raban, R., Akbari, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Developing+genetic+tools+to+control+ACP.">Developing genetic tools to control ACP.</a> Citrus Research Board Citrograph Magazine. 11 (1), 64-68 (2020).</li></ol>

Con el reciente aumento del uso de Nasonia vitripennis como organismo modelo para diversas cuestiones biológicas2,3,7,17,existe la necesidad de desarrollar y optimizar los métodos de inyección para permitir un protocolo simplificado y eficiente para el análisis funcional de los genes de N. vitripennis. Los métodos actuales que involucran la microinyección embrionaria de ...

La edición de genes CRISPR/Cas9 es una poderosa tecnología para estudios genéticos funcionales, especialmente en muchos organismos modelo ascendentes como la avispa joya, Nasonia vitripennis. La facilidad de cría y la disponibilidad de un genoma completo hacen de la avispa joya un importante sistema experimental para dilucidar los mecanismos moleculares de diferentes procesos biológicos. Por ejemplo, N. vitripennis se ha utilizado recientemente para desentrañar la base epigenética del sistema de determinación de sexo haplodiploide1,2,la biología de los cromosomas B3,4,5,6,y la base genética para la regulación circadiana y estacional7,8. Algunas de las características que hacen que N. vitripennis sea susceptible de trabajar incluyen un corto tiempo de generación (~ 2 semanas a 25 ° C), altas tasas de reproducción, fácil separación sexual en la etapa pupal y la capacidad de diapausa y almacenar cepas a 4 ° C. El ciclo de vida comienza con las avispas hembras parasitando las pupas de la luciérnga, Sarcophaga bullata. A través de su ovipositor, las hembras ponen hasta 50 huevos en el caso pupal de la 8ra. Los huevos se convierten en larvas que se alimentan de la pupa de S. bullata, continúan desarrollándose durante los próximos días, y luego pupan, seguidos de eclosión adulta y la aparición del pupario huésped9.
Se dispone de herramientas moleculares para realizar estudios genéticos funcionales en N. vitripennis,tales como la interferencia de ARN (ARNi)10 y CRISPR/Cas911,12,pero son limitadas, principalmente debido a las dificultades en la realización de microinyecciones embrionarias13. Como los huevos de N. vitripennis requieren un huésped pupal para el desarrollo, la manipulación de huevos es muy difícil. Los embriones en etapa pre-blastodermo deben ser recolectados de las pupas de la luciérnga del huésped, microinyectados rápidamente y transferidos inmediatamente de vuelta al huésped para su desarrollo13. Estos pasos requieren precisión y entrenamiento especializado para evitar dañar los embriones microinyectados o los hospedadores pupales13. Además, los óvulos son muy pequeños y frágiles, especialmente después de microinyecciones, con un citoplasma muy viscoso que provoca una obstrucción continua de la aguja de inyección13. Estas características hacen que las microinyecciones embrionarias sean excepcionalmente desafiantes, requiriendo operadores altamente capacitados y equipos especializados que están ausentes en la mayoría de los laboratorios de N. vitripennis.
La optimización de métodos alternativos de inyección para la administración de reactivos CRISPR contribuiría a la consolidación de N. vitripennis como organismo modelo. La manipulación de pupas y adultos es menos difícil que la manipulación de embriones y se puede lograr con una configuración básica de inyección. Aquí, dos protocolos se describen para la inyección de pupas y adultos: uno que implica el equipo especializado para las inyecciones, y el otro que implica el uso de un conjunto del tubo del aspirador cabido con una aguja capilar de cristal. El uso de un tubo aspirador es particularmente adecuado para laboratorios que no tienen acceso a equipos especializados para microinyecciones de embriones. Se demuestran inyecciones eficientes de diferentes etapas de desarrollo de N. vitripennis,incluyendo pupas blancas o negras y avispas adultas. Las avispas en la etapa de pupa blanca son particularmente adecuadas para experimentos de derribo mediados por RNAi. Aunque RNAi en Nasonia fue descrito por primera vez por Lynch y Desplan en 200610, no hay ningún procedimiento visual disponible para cómo se realizan las inyecciones de RNAi. RNAi fue utilizado recientemente para descubrir el gen haploidizador del cromosoma B PSR (Paternal Sex Ratio)3 y para estudiar la implicación del gen reloj, período,en los ritmos biológicos de N. vitripennis 7.
Las pupas negras y las avispas adultas se pueden utilizar para inducir la edición de genes de línea germinal CRISPR/Cas9 utilizando los protocolos ReMOT Control (Receptor-Mediated Ovary Transduction of Cargo) y BAPC (Branched Amphiphilic Peptide Capsules). Estos dos métodos de administración de ovarios se han descrito recientemente como eficaces en Nasonia para generar mutaciones en la línea germinal en el gen diana, el cinabrio7,12. Aquí, se proporciona un protocolo simplificado para las inyecciones que incluye un procedimiento visual de una metodología paso a paso para inyecciones pupales y adultas que se pueden utilizar para generar estudios de genética funcional en Nasonia y probablemente en otras avispas parasitoides, sin requerir equipo especializado y evitando microinyecciones embrionarias.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>100 x 15 mm Stackable Petri Dishes, Polystyrene, Mono, Sterile</td>
			<td>Sigma</td>
			<td>960-97693-083</td>
			<td></td>
		</tr>
		<tr>
			<td>Aluminosilicate glass capillary tubing 1 mm(outside diameter) x 0.58 mm (inner diameter)</td>
			<td>Sutter Instruments</td>
			<td>BF100-58-10</td>
			<td>Can also use Borosilicate or Quartz</td>
		</tr>
		<tr>
			<td>Aspirator tube assemblies for calibrated microcapillary pipettes</td>
			<td>Sigma</td>
			<td>A5177-5EA</td>
			<td></td>
		</tr>
		<tr>
			<td>BAPC</td>
			<td>phoreus biotech</td>
			<td>BAPtofect-25 0.5 mg Kit</td>
			<td></td>
		</tr>
		<tr>
			<td>Cas9 Protein with NLS</td>
			<td>PNABio</td>
			<td>CP01</td>
			<td></td>
		</tr>
		<tr>
			<td>Dissecting needle</td>
			<td>VWR</td>
			<td>10806-330</td>
			<td></td>
		</tr>
		<tr>
			<td>DNase/RNase-Free distilled Water</td>
			<td>Invitrogen</td>
			<td>10977-015</td>
			<td></td>
		</tr>
		<tr>
			<td>Femtojet Express programmable microinjector</td>
			<td>Eppendorf</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Femtotips Microloader tips</td>
			<td>Fisher Scientific</td>
			<td>E5242956003</td>
			<td></td>
		</tr>
		<tr>
			<td>Fine-tip paintbrush</td>
			<td>ZEM</td>
			<td>2595</td>
			<td></td>
		</tr>
		<tr>
			<td>Flesh fly pupae,&#160;Sarcophaga bullata</td>
			<td>Ward&#39;s Science</td>
			<td>470180-392</td>
			<td></td>
		</tr>
		<tr>
			<td>Food colorant dye</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Glass Test Tubes</td>
			<td>Fisher Scientific</td>
			<td>982010</td>
			<td></td>
		</tr>
		<tr>
			<td>Glue</td>
			<td>Elmer&#39;s</td>
			<td></td>
			<td>washable, no toxic school glue</td>
		</tr>
		<tr>
			<td>Micropipette Puller</td>
			<td>Sutter Instruments</td>
			<td>P-1000 or P-2000</td>
			<td></td>
		</tr>
		<tr>
			<td>Microscope Slides</td>
			<td>Fisherbrand</td>
			<td>12-550-A3</td>
			<td></td>
		</tr>
		<tr>
			<td>Stereo Microscope</td>
			<td>Olympus</td>
			<td>SZ51</td>
			<td></td>
		</tr>
	</tbody>
</table>

pupal and adult injections for rnai and crispr gene editing in nasonia vitripennis

La avispa joya, Nasonia vitripennis,se ha convertido en un sistema modelo eficiente para estudiar la epigenética de la determinación del sexo haplo-diploide, la biología del cromosoma B, las interacciones huésped-simbionte, la especiación y la síntesis de veneno. A pesar de la disponibilidad de varias herramientas moleculares, incluyendo CRISPR/Cas9, los estudios genéticos funcionales todavía son limitados en este organismo. La principal limitación de la aplicación de la tecnología CRISPR/Cas9 en N. vitripennis se deriva de los desafíos de las microinyecciones embrionarias. Las inyecciones de embriones son particularmente difíciles en este organismo y en general en muchas avispas parasitoides, debido al pequeño tamaño del embrión y el requisito de una pupa huésped para el desarrollo embrionario. Para abordar estos desafíos, se optimizó la entrega del complejo de ribonucleoproteína Cas9 en los ovarios femeninos por inyección adulta, en lugar de microinyección embrionaria, lo que resultó en ediciones de línea germinal somáticas y heredables. Los procedimientos de inyección se optimizaron en pupas y avispas hembras utilizando ReMOT Control (Receptor-Mediated Ovary Transduction of Cargo) o BAPC (Branched Amphiphilic Peptide Capsules). Estos métodos han demostrado ser alternativas eficaces a la inyección de embriones, lo que permite mutaciones de la línea germinal hereditarias y específicas del sitio.

Este papel presenta dos métodos fáciles para la microinyección pupal y adulta, usando un femtojet o un tubo del aspirador. El primer método permite una inyección más precisa de líquido, que es importante para la consistencia de RNAi, mientras que el segundo permite la inyección de mayores cantidades de líquido en pupas nasonia o adultos.
Los resultados representativos presentados en la Tabla 1 ...

Watch this Scientific Journal Video about Pupal and Adult Injections for RNAi and CRISPR Gene Editing in Nasonia vitripennis at JoVE.com

Pupal and Adult Injections for RNAi and CRISPR Gene Editing in Nasonia vitripennis

Aquí, se describen los métodos para las inyecciones pupales y adultos eficientes en Nasonia vitripennis como alternativas accesibles a la microinyección embrionaria, lo que permite el análisis funcional de los genes de interés utilizando ya sea arn-silenciamiento a través de la interferencia de ARN (RNAi) o knockout gen a través de CRISPR / Cas9 edición del genoma.

Inyecciones pupales y para adultos para RNAi y edición de genes CRISPR en Nasonia vitripennis

The jewel wasp, Nasonia vitripennis, has become an efficient model system to study epigenetics of haplo-diploid sex determination, B-chromosome biology, ...

Research on non-canonical insect model, like parasitoid wasp, is limited because embryonic microinjection is very challenging. Our method bypasses this problem, enabling site-specific and heritable germline mutations. Injecting pupae or adult females is fast and removes the requirement for expensive equipment or specialized training required to achieve successful embryonic microinjections.This technique will allow no specialized labs that do not have access to expensive equipment to do functional studies in any insect species they are using as a model. After the optimization, this method can be used to study functional genetics of many other genes in Nasonia. We also think this method may be used to deliver nucleic acids for genetic transformation of Nasonia or other insects.Begin by setting up approximately 20 mated females singularly in small glass test tubes plugged with cotton. Add two S.bullata hosts per tube and maintain the wasps at 25 degrees Celsius and 30%relative humidity with a 12:12 light dark cycle for two to three days. After two to three days, gently remove the females using a fine tipped brush to avoid continuous over position and a synchrony in offspring development.Removed females can optionally be re-hosted or stored at five degrees Celsius for up to a month. Maintain the parasitized host at 25 degrees Celsius and 30%relative humidity with a 12:12 light dark cycle for seven days if the desired injection stage requires white pupae, for 13 days, if the required developmental stage is black pupae, or 14 days for young, newly emerged adults. When the desired stage is reached, crack open the host puparium with a dissecting needle to recover N.vitripennis pupae and adults.Prepare a glass slide by applying a line of school glue at the center. Spread the glue with the dissecting needle to obtain a thick layer, which will be used to align the pupae. Let the glue dry for approximately two minutes before transferring the pupae.Under a dissecting microscope, use a dissecting needle to apply glue on the back of the head of the pupa. Attach the pupa to the glue layer on the slide with its abdomen facing up. Align 20 to 30 pupae side-by-side on the slide.Place the slide with the pupae and a Petri dish to let the glue drive for approximately 10 minutes. Before starting the injections, test the adherence of the pupae to the glue by pushing them gently with the dissecting needle. If most of the pupae are loosened, prepare a new slide.Alternatively, remove all loose pupae and proceed to inject those that are properly attached to the slide. Load one capillary glass tube into a needle puller and pull needles following the manufacturer's instructions. Load the needle with five microliters of the prepared injection mixture using microloader pipette tips.Open the needle, sliding the tip on a surface made from two overlapping slides. Alternatively, open the tip of the needle with a pair of fine forceps to create a sharp edge. Place the slide with the aligned pupae under a dissecting microscope, then insert the needle into the femtojet's injection tube and tighten the grip head.Looking at the needle under the microscope, turn on the femtojet and set the compensation pressure and injection pressure parameters by rotating the rotary knobs. Carefully insert the needle between the second and third visible abdominal segments with a vertical angle of about 30 degrees. Inject with a continuous flow until the whole abdomen turns green in the case of white stage pupae or until the abdomen increases in size in the case of black pupae.Stop injecting when it is clear that the abdomen cannot take any more liquid or when the liquid starts flowing out of the body. Move carefully to the next pupa and repeat these steps. Transfer the slide with the injected pupae to a Petri dish.Cover the dish with its lid and place it at 25 degrees Celsius until wasp emergence. For adult preparation, separate groups of 20 virgin females in a clean small test tube with a fine paint brush. Place a glass slide on top of ice and align the female side by side on the cold slide with abdomens facing up under a dissecting scope.Load one needle with the ribonucleoprotein solution using a microloading tip and insert the needle into the connector pack of the aspirator tube assembly. Support the females from the opposite side with blunted dissecting needles, while injecting slowly into the abdomen. Avoid touching the ovipositor.This will severely damage this critical reproductive structure. Carefully insert the needle between the second and third visible abdominal segments with a vertical angle of about 30 degrees. Inject the solution into the female abdomen, stopping when no more liquid can enter or when leaking of surplus solution is observed.Move carefully to the next female and repeat these steps. When finished, gently transfer a single injected females to a new tube with one host using a paintbrush. Leave them to recover at room temperature for approximately one hour, confirm survival, and return the tubes to the rearing incubator.After adult eclosion from the injected pupae, place single wasps into a glass to plugged with cotton and insert one S.bullata host. For CRISPR/Cas9 knockout experiments, allow females to parasitize the host for one day and replace the host each day for three consecutive days. Place the parasitized host, set 25 degrees Celsius until emergence of the G0 male offspring, approximately 13 to 14 days.Under a dissecting microscope, screen G0 males for the mutated phenotypes. The cinnabar gene is responsible for eye pigmentation. Wasps with brown eyes are wild-type and wasps with bright red eyes or variations between red and brown eyes are mutants.This protocol can be used for either pupal or adult microinjection. Survival rates of this procedure range from 15 to 100%The efficiency of achieving the desired phenotype via RNAi or CRISPR without requiring laborious egg injections is shown here. When injecting pupae or adult females, the needle should be sharp and be introduced in a way that liquid should not leak immediately after injecting.If this happens, remove the needle, ensure that the tip is fine and sharp, change it if necessary or inject in a different location. Function analysis can be performed on the gene of interest targeted from this procedure. This will answer a question about the gene function and if the gene is necessary for the specific phenotype studied.

Research

JoVE Journal

Biology

Pupal and Adult Injections for RNAi and CRISPR Gene Editing in Nasonia vitripennis

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