We began by segmenting
synthetic genomes into 200 kb non-overlapping bins and tallying the total bp coverage of each type of gap annotation.
Obama called for the study in May after a team led by biologist J. Craig Venter reported that it had inserted
a synthetic genome into a self - replicating cell.
Not exact matches
They built up the
synthetic genome from 1078 units of approximately 1000 base pairs, assembling them
into larger and larger units by a factor of ten each time, until they created the complete
genome of about 1.08 million base pairs after three such stages.
Venter and his team have previously accomplished both feats — creating a
synthetic genome and transplanting a
genome from one bacterium
into another — but this time they have combined the two.
The cell
into which the
synthetic genome was then transplanted contained its own proteins, lipids and other molecules.
Synthetic biology enables researchers to tackle a huge and diverse range of applied problems: building a cell with the smallest possible
genome; synthesizing proteins with extra amino acids — more than the 20 found in nature; using bacteria to produce medicines previously too complex to synthesize; even decomposing living organisms
into standard, off - the - shelf «biobricks» that can be assembled on demand.
Unlike the first
synthetic cells made in 2010, in which Venter's team at the J. Craig Venter Institute in La Jolla, California, copied an existing bacterial
genome and transplanted it
into another cell, the
genome of the minimal cells is like nothing in nature.
The new study shows that the
synthetic compound is capable of inhibiting the activities of several DNA - processing enzymes, including the «integrase» used by the Human Immunodeficiency Virus (HIV) to insert its
genome into that of its host cell.
The NRC report comes less than three months after Craig Venter and his colleagues at the J. Craig Venter Institute in Rockville, Md., published their manufacture and insertion of a
synthetic bacterial
genome into a closely related bacterial cell which was then able to self - replicate.
He has coded everything from a Goethe poem to a map of the Milky Way
into synthetic DNA, which he then inserts
into the
genome of living bacteria like E. coli.
A
synthetic Mycoplasma mycoides
genome transplanted
into M. capricolum was able to control the host cell.
We report the design, synthesis, and assembly of the 1.08 — mega — base pair Mycoplasma mycoides JCVI - syn 1.0
genome starting from digitized
genome sequence information and its transplantation
into a M. capricolum recipient cell to create new M. mycoides cells that are controlled only by the
synthetic chromosome.
«A key prerequisite for using effective
synthetic bacteriophages is that their
genome is unable to integrate
into the host's
genome,» Kilcher emphasises.
The sequencing technology works by first chopping the
genome into single - stranded DNA fragments and combining them with snippets of known
synthetic DNA so that they form small circles of about 400 bases.
Incorporating a
synthetic phage
genome into Gram - positive bacteria has so far been very problematic, as their cell walls are so thick.
Finally, the
synthetic genomes were segmented at a window size of 200kb
into distinct genomic bins where the total size of each gap annotation was tallied.
To account for the placement of gaps from one
genome into another, we adjusted the genomic coordinates at the target loci, resulting in a
synthetic genome for both species (Methods).
In May 2010, the J. Craig Venter Institute announced that its lab had built the first
synthetic, self - replicating bacterial cell — that is, researchers inserted a
synthetic genome, which did not exactly match the DNA sequence of any natural
genome,
into an existing working cell; the cell accepted the
synthetic genome and reproduced.
There is an incredibly powerful new tool for
genome editing called CRISPR Cas 9 that can indeed swap
synthetic mammoth genes
into an elephant
genome, and this has been done by George Church and his team at Harvard.
Synthetic biologists may use computers to design gene sequences that don't exist in nature, have those sequences chemically synthesized, and then insert them
into the
genome of existing organisms.
The JCVI teams are focused on a variety of genomic research areas including continued work in
synthetic biology; sampling and analysis of the world's oceans, fresh water and soils to better understand the microbes living in these environments; and new analysis on the human
genome in the hopes of discovering new insights
into disease prevention and treatment.
And the final piece of the puzzle, according to Herman, dropped
into place last year, when the J. Craig Venter Institute and
Synthetic Genomics created a cell from scratch with the minimum
genome an organism needs to survive.
Synthetic biology combines chemical synthesis of DNA with growing knowledge of genomics to enable researchers to quickly manufacture catalogued DNA sequences andassemble them
into new
genomes.