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Complete Chemical Synthesis, Assembly, and Cloning of a Mycoplasma genitalium Genome
Daniel G. Gibson,Gwynedd A. Benders,Cynthia Andrews-Pfannkoch,Evgeniya A. Denisova,Holly Baden-Tillson,Jayshree Zaveri,Timothy B. Stockwell,Anushka Brownley,David W. Thomas,Mikkel A. Algire,Chuck Merryman,Lei Young,Vladimir N. Noskov,John I. Glass,J. Craig Venter,Clyde A. Hutchison, III,Hamilton O. Smith*
We have synthesized a 582,970–base pair Mycoplasma genitaliumgenome. This synthetic genome, named M. genitalium JCVI-1.0,contains all the genes of wild-type M. genitalium G37 exceptMG408, which was disrupted by an antibiotic marker to blockpathogenicity and to allow for selection. To identify the genomeas synthetic, we inserted "watermarks" at intergenic sites knownto tolerate transposon insertions. Overlapping "cassettes" of5 to 7 kilobases (kb), assembled from chemically synthesizedoligonucleotides, were joined by in vitro recombination to produceintermediate assemblies of approximately 24 kb, 72 kb ("1/8genome"), and 144 kb ("1/4 genome"), which were all cloned asbacterial artificial chromosomes in Escherichia coli. Most ofthese intermediate clones were sequenced, and clones of allfour 1/4 genomes with the correct sequence were identified.The complete synthetic genome was assembled by transformation-associatedrecombination cloning in the yeast Saccharomyces cerevisiae,then isolated and sequenced. A clone with the correct sequencewas identified. The methods described here will be generallyuseful for constructing large DNA molecules from chemicallysynthesized pieces and also from combinations of natural andsynthetic DNA segments.
The J. Craig Venter Institute, Rockville, MD 20850, USA.
* To whom correspondence should be addressed. E-mail: hsmith{at}jcvi.org
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