We would like to thank the Canadian Foundation for Innovation, the British Columbia Knowledge Development Fund and the National Sciences and Engineering Research Council (NSERC) of Canada for supporting ongoing studies on low oxygen regions of coastal and open ocean waters. M.T. and S.L were supported by fellowships from the TULA foundation funded Centre for Microbial Diversity and Evolution (CMDE). M.T. also received fellowship support from the Deutsche Forschungsgemeinschaft (DFG).

Fosmid library construction has been divided into four main steps and sub-divided into several parts (see Fig.1 for an overview).
Step I (see protocol "DNA extraction from 0.22 &mu;M Sterivex filters" [3])
Part 1: Enzyme-catalyzed cell lysis
Part 2: Purification of environmental DNA by CsCl density gradient centrifugation and DNA recovery
Part 3: Quality control of extracted DNA by gel electrophoresis...

<ol>
	<li>Zaikova, E., Hawley, A., Walsh, D. A., Hallam, S. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Seawater+sampling+and.">Seawater sampling and.</a> J Vis Exp. , (2009).</li><li>Walsh, D. A., Zaikova, E., Hallam, S. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Large+volume+(20L+)+filtration+of+coastal+seawater+samples.">Large volume (20L+) filtration of coastal seawater samples.</a> J Vis Exp. 28, (2009).</li><li>Wright, J. J., Lee, S., Zaikova, E., Walsh, D. A., Hallam, S. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=DNA+Extraction+from+0.22+&#956;M+Sterivex+Filters+and+Cesium+Chloride+Density+Gradient+Centrifugation.">DNA Extraction from 0.22 &#956;M Sterivex Filters and Cesium Chloride Density Gradient Centrifugation.</a> J Vis Exp. 31, 10-3791 (2009).</li><li>Stein, J. L., Marsh, T. L., Wu, K. Y., Shizuya, H., DeLong, E. F. <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+uncultivated+prokaryotes:+isolation+and+analysis+of+a+40-kilobase-pair+genome+fragment+from+a+planktonic+marine+archaeon.">Characterization of uncultivated prokaryotes: isolation and analysis of a 40-kilobase-pair genome fragment from a planktonic marine archaeon.</a> J. Bacteriol. 178, 591-599 (1996).</li><li>B&#233;j&#224;, O., Suzuki, O., Koonin, M. T., Aravind, E. V., Hadd, L., Nguyen, L. P. A., Villacorta, R., Amjadi, M., Garrigues, C., Jovanovich, S. B., Feldman, R. A., DeLong, E. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Construction+and+analysis+of+bacterial+artificial+chromosome+libraries+from+a+marine+microbial+assemblage.">Construction and analysis of bacterial artificial chromosome libraries from a marine microbial assemblage.</a> Environ. Microbiol. 2, 516-529 (2000).</li><li>DeLong, E. F., Preston, C. M., Mincer, T., Rich, V., Hallam, S. J., Frigaard, N. -. U., Martinez, A., Sullivan, M. B., Edwards, R., Brito, B. R., Chisholm, S. W., Karl, D. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Community+genomics+among+stratified+microbial+assemblages+in+the+Ocean's+interior.">Community genomics among stratified microbial assemblages in the Ocean's interior.</a> Science. 311, 496-503 (2006).</li><li>Hallam, S. J., Putnam, N., Preston, C. M., Detter, J. C., Rokhsar, D., Richardson, P. M., DeLong, E. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reverse+methanogenesis:+testing+the+hypothesis+with+environmental+genomics.">Reverse methanogenesis: testing the hypothesis with environmental genomics.</a> Science. 305, 1457-1462 (2004).</li></ol>

A procedure is described how to most efficiently generate a large-insert fosmid library with genomic DNA derived from a coastal water sample. Up-stream genomic DNA extraction is described in a separate protocol [3]. 
As the fosmid-library production is a multistep-process, plan at least two to three weeks in time for the whole procedure including all four presented steps. The extraction of genomic DNA is the most crucial step and all down-stream steps rely on the quality and quantity of extra...

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		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>Step II</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>CopyControl&trade; Fosmid Library Production Kit</td>
<td>&nbsp;</td>
<td>EPICENTRE</td>
<td>CCFOS110</td>
<td>sufficient to generate 9-10 fosmid libraries</td>
</tr>
<tr>
<td>SeaPlaque Agarose</td>
<td>&nbsp;</td>
<td>Cambrex</td>
<td>50100</td>
<td>&nbsp;</td>
<tr>
<td>stirring hot plate</td>
<td>&nbsp;</td>
<td>Corning</td>
<td>PC-420D</td>
<td>&nbsp;</td>
<tr>
<td>1.0X TAE running buffer</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>CHEF Mapper XA pulsed field electrophoresis system including cooling module and variable speed pump</td>
<td>&nbsp;</td>
<td>Bio-Rad</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>&lambda; DNA-HindIII Digest</td>
<td>&nbsp;</td>
<td>NEB</td>
<td>N3012S</td>
<td>&nbsp;</td>
<tr>
<td>MidRange I PFG Marker</td>
<td>&nbsp;</td>
<td>NEB</td>
<td>N3551S</td>
<td>&nbsp;</td>
<tr>
<td>10,000X SYBR Gold</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>S11494</td>
<td>&nbsp;</td>
<tr>
<td>microwavable plastic wrap</td>
<td>&nbsp;</td>
<td>Saran premium wrap</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Safe Imager transilluminator</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>S37102</td>
<td>&nbsp;</td>
<tr>
<td>GELase Agarose Gel-Digesting Preparation</td>
<td>&nbsp;</td>
<td>EPICENTRE</td>
<td>G09100</td>
<td>&nbsp;</td>
<tr>
<td>scalpel</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>08-927-5D</td>
<td>&nbsp;</td>
<tr>
<td>Amicon Ultra-4 Centrifugal Filter Unit with Ultracel-10 membrane</td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>UFC801024</td>
<td>&nbsp;</td>
<tr>
<td>Microcon YM-30 Centrifugal Filter Unit </td>
<td>&nbsp;</td>
<td>Millipore</td>
<td>42410</td>
<td>&nbsp;</td>
<tr>
<td>nuclease free water</td>
<td>&nbsp;</td>
<td>Ambion</td>
<td>AM9932</td>
<td>&nbsp;</td>
<tr>
<td>Quant-iT PicoGreen dsDNA Assay Kit *2000 assays*#</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>P7589</td>
<td>&nbsp;</td>
<tr>
<td>digital dry block heater</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>12621-088</td>
<td>&nbsp;</td>
<tr>
<td>water bath</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>14231-854</td>
<td>&nbsp;</td>
<tr>
<td>centrifuge</td>
<td>&nbsp;</td>
<td>Beckman Coulter</td>
<td>Avanti J-E</td>
<td>&nbsp;</td>
<tr>
<td>centrifuge rotor</td>
<td>&nbsp;</td>
<td>Beckman Coulter</td>
<td>JA 5.3</td>
<td>&nbsp;</td>
<tr>
<td>table top centrifuge</td>
<td>&nbsp;</td>
<td>Eppendorf</td>
<td>5415D</td>
<td>&nbsp;</td>
<tr>
<td>microcentrifuge tubes, 1.7 mL, clear</td>
<td>&nbsp;</td>
<td>Axygen</td>
<td>MCT-175-C</td>
<td>&nbsp;</td>
<tr>
<td>15 mL centrifuge tubes </td>
<td>&nbsp;</td>
<td>Fisher-Corning</td>
<td>430052</td>
<td>&nbsp;</td>
<tr>
<td>Step III</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>LB broth</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>BP 1426-2</td>
<td>&nbsp;</td>
<tr>
<td>MgSO4</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>M2643</td>
<td>&nbsp;</td>
<tr>
<td>phage dilution buffer</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>10 mM Tris-HCl [pH 8.3], 100 mM NaCl, 10 mM MgCl2</td>
</tr>
<tr>
<td>cryogenic vials</td>
<td>&nbsp;</td>
<td>Fisher-Corning</td>
<td>430488</td>
<td>&nbsp;</td>
<tr>
<td>Step IV</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>96 well plate with lid</td>
<td>&nbsp;</td>
<td>Fisher-Corning</td>
<td>CS003370(3370)</td>
<td>&nbsp;</td>
<tr>
<td>384 well plate with lid</td>
<td>&nbsp;</td>
<td>Fisher-Corning</td>
<td>07201157(3680)</td>
<td>&nbsp;</td>
<tr>
<td>Petri dishes 100 O.D. x 15mm H</td>
<td>&nbsp;</td>
<td>Fisher</td>
<td>08-757-12</td>
<td>&nbsp;</td>
<tr>
<td>Petri dishes 150 Dia. x 15mmH</td>
<td>&nbsp;</td>
<td>Fisher</td>
<td>08-757-14</td>
<td>&nbsp;</td>
<tr>
<td>BD Falcon BioDish XL 245 X 245 mm</td>
<td>&nbsp;</td>
<td>VWR</td>
<td>CABD351040</td>
<td>&nbsp;</td>
<tr>
<td>glycerol</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>G5516</td>
<td>&nbsp;</td>
<tr>
<td>chloramphenicol</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>C0378</td>
<td>&nbsp;</td>
<tr>
<td>LB broth</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>BP 1426-2</td>
<td>&nbsp;</td>
<tr>
<td>Difco Agar</td>
<td>&nbsp;</td>
<td>BD</td>
<td>214530</td>
<td>&nbsp;</td>
<tr>
<td>glass beads</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>10-310-1</td>
<td>&nbsp;</td>
<tr>
<td>QFill3</td>
<td>&nbsp;</td>
<td>Genetix</td>
<td>X3050</td>
<td>&nbsp;</td>
<tr>
<td>Bleach</td>
<td>&nbsp;</td>
<td>Javex</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Ethanol</td>
<td>&nbsp;</td>
<td>Sigma-Aldrich</td>
<td>E7023</td>
<td>&nbsp;</td>
<tr>
<td>15 mL centrifuge tubes</td>
<td>&nbsp;</td>
<td>Fisher-Corning</td>
<td>430052</td>
<td>&nbsp;</td>
<tr>
<td>QPix colony picker</td>
<td>&nbsp;</td>
<td>Genetix</td>
<td>QPix2</td>
<td>&nbsp;</td>
<tr>
<td>picking head (E. coli) </td>
<td>&nbsp;</td>
<td>Genetix</td>
<td>X4006</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

large insert environmental genomic library production

The vast majority of microbes in nature currently remain inaccessible to traditional cultivation methods. Over the past decade, culture-independent environmental genomic (i.e. metagenomic) approaches have emerged, enabling researchers to bridge this cultivation gap by capturing the genetic content of indigenous microbial communities directly from the environment. To this end, genomic DNA libraries are constructed using standard albeit artful laboratory cloning techniques. Here we describe the construction of a large insert environmental genomic fosmid library with DNA derived from the vertical depth continuum of a seasonally hypoxic fjord. This protocol is directly linked to a series of connected protocols including coastal marine water sampling [1], large volume filtration of microbial biomass [2] and a DNA extraction and purification protocol [3]. At the outset, high quality genomic DNA is end-repaired with the creation of 5 -phosphorylated blunt ends. End-repaired DNA is subjected to pulsed-field gel electrophoresis (PFGE) for size selection and gel extraction is performed to recover DNA fragments between 30 and 60 thousand base pairs (Kb) in length. Size selected DNA is purified away from the PFGE gel matrix and ligated to the phosphatase-treated blunt-end fosmid CopyControl vector pCC1 (EPICENTRE <a href="http://www.epibio.com/item.asp?ID=385">http://www.epibio.com/item.asp?ID=385</a>). Linear concatemers of pCC1 and insert DNA are subsequently headfull packaged into phage particles by lambda terminase, with subsequent infection of phage-resistant E. coli cells. Successfully transduced clones are recovered on LB agar plates under antibiotic selection and archived in 384-well plate format using an automated colony picking robot (Qpix2, GENETIX). The current protocol draws from various sources including the CopyControl Fosmid Library Production Kit from EPICENTRE and the published works of multiple research groups [4-7]. Each step is presented with best practice in mind. Whenever possible we highlight subtleties in execution to improve overall quality and efficiency of library production. The whole process of fosmid library production and automated colony picking takes at least 7-10 days as there are many incubation steps included. However, there are several stopping points possible which are mentioned within the protocol.

Watch this Scientific Journal Video about Large Insert Environmental Genomic Library Production at JoVE.com

Large Insert Environmental Genomic Library Production

Construction of a fosmid library with environmental genomic DNA isolated from the vertical depth continuum of a seasonally hypoxic fjord is described. The resulting clone library is picked into 384-well plates and archived for downstream sequencing and functional screening by the application of an automated colony picking system.

The vast majority of microbes in nature currently remain inaccessible to traditional cultivation methods. Over the past decade, culture-independent ...

large-insert-environmental-genomic-library-production

Research

JoVE Journal

Biology

15.7K Aufrufe.  University of British Columbia - UBC. Bau eines Fosmid Bibliothek mit Umwelt-genomischer DNA aus der vertikalen Tiefe Kontinuum einer saisonal hypoxischen Fjord isoliert beschrieben. Der resultierende Klon-Bibliothek ist in 384-Well-Platten aufgenommen und archiviert für Downstream-Sequenzierung und funktionelle Screening durch die Anwendung eines automatisierten Kolonie Kommissioniersystem.