An intelligence team for CRISPR warrior proteins

doudna_crispr_wide-cb9478286d39615ed64291ea95d4cfe022596aa2-s900-c85The University of Berkeley has opened a glimpse into the way bacteria use CRISPR, the microbial immune system that inspired the invention of the method for genetic modification also known as CRISPR. The paper published in Science by Jennifer Doudna’s team is a fascinating piece of basic research and scientists are hopeful they will be able to turn the discovery into a new biotech tool. Continue reading

Run, CRISPR, run

A few artists are already interested in using CRISPR to explore the border between biology and art, but scientists have so far been able to develop the artistic potential of genetics more elegantly and surprisingly. In this Nature paper, George Church’s group recalls the beginnings of cinematography by introducing old images of a galloping horse into a dividing bacterial population. Harvard researchers have chosen a historical sequence captured by British photographer Eadweard Muybridge in 1887, using a code based on nucleotide triplets to specify pixels tonalities. The exploit is technically astonishing, and it is not just a divertissement. It represents a proof of concept that one day perhaps we will be able to build cellular recorders, that can collect and store what is going on inside cells. But enthusiasm for futuristic research applications is joined here by an ancient sense of wonder. That galloping horse turns upside down proportion and hierarchy: it is the great in the small, the elegant in the primitive, the mammal in bacteria. Science has become magic. Art indeed.


Clearing CRISPR of off-target suspicion

mathcrisprFaster, better, cheaper is a motto adopted by Nasa that perfectly fits CRISPR as well. The most popular technique for genetic modification, in fact, has the reputation of being quick, affordable and precise. This deserved good name was unexpectedly tarnished by a study questioning the technology precision, published in the June issue of Nature Methods. However, reports about CRISPR’s demise have been greatly exaggerated, to paraphrase Mark Twain. Just over a month later, three analyses challenging the controversial study are already available in the pre-publication archive bioRxiv, and Nature Methods has alerted its readers about the criticisms received by publishing an editorial note which could turn into a retraction. Continue reading

Craig Venter fills up with CRISPR biodiesel

credit Synthetic Genomics alghe coltivate in bioreattori

Our greatest chance to win the biofuels bet is now called Nannochloropsis gaditana. These marine micro-algae do not need fresh water and produce large amounts of fat easy to convert into biodiesel. But even the best natural talent must be cultivated with hard work. Imad Ajjawi and colleagues did just that in the lab, doubling the lipid content of their algae with the help of CRISPR, the celebrated gene-editing technique. Continue reading

Everything you always wanted to know about gene drives

OLYMPUS DIGITAL CAMERAMosquito nets are not enough, vaccines are late to come, land reclamation in Africa is a challenge. But there is a new hope for defeating malaria, coming directly from the most advanced CRISPR frontier. The trick is a kind of genetic chain reaction fuelled by genetic elements called “gene drives”. Researchers are experimenting their power with the aim of crashing the number of mosquitoes responsible for Plasmodium transmission, by spreading genes that are bad for Anopheles gambiae. A gene behaving in Mendelian way has a 50% chance of being passed on from parent to offspring, but it can virtually reach 100% with a little help from a drive. Thus a gene designed to damage a harmful species can propagate within a few generations with a domino effect, until the population collapses. One of the founders of this futuristic strategy is an Italian molecular parasitologist: Andrea Crisanti, of the London Imperial College. We asked him to explain times and ways, strengths and risks of this approach. Continue reading

CRISPRing future harvests at DuPont

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CRISPR is set to make its commercial debut in maize fields in 2020. The honor (and burden) of probing the market, as the first product developed with the revolutionary technique for genome editing, is up to a kind of corn called waxy for the appearance of its kernels. Its starch is almost entirely amylopectin and almost zero amylose. Conventional waxy varieties already available to farmers have some yield drag due to the undesirable genetic baggage introduced by breeding. Conversely, DuPont Pioneer researchers created a waxy version of their best corn without yield drag or foreign DNA by editing out a gene for an enzyme that produces amylose. Amylopectin is used for the production of goods such as paper adhesives and food thickeners. What remains after its extraction is a protein flour that can be employed as feed. It may sound like a low-profile debut for the celebrated genome editing technology that is asked to succeed where GMOs have failed: gaining consumer confidence. But this is a deliberate strategy, as explained below by Neal Gutterson, DuPont Pioneer’s vice president of R&D. Continue reading