Wednesday, August 29, 2012

Big Agriculture Bankrolling RNAi Therapeutics


After years of pouring millions, if not billions into RNAi-related intellectual property (IP) and the development of double-strand RNA delivery, the RNAi Therapeutics industry is now harvesting returns from an unlikely source: agricultural companies.

Most notably, Alnylam reported yesterday an IP license and collaboration agreement with Monsanto which is widely known for its transgenic seed business.  Particularly eye-catching was the $29.2M in upfront monies, an amount not seen in RNAi Therapeutics for a long time.

However, Alnylam is not the only RNAi company that has been approached by Big Ag.  Admittedly somewhat flying under my radar, Devgenclosed a similarly upfronted RNAi collaboration with Syngenta in May of this year.  Interestingly, that deal came after Devgen’s 4-5 year RNAi partnership with Monsanto had ended in 2011, earning the Belgian (ag) company tens of millions.  This suggests that there is an RNAi scramble in the Ag space reminiscent of what happened in RNAi Therapeutics in 2006-8.  Moreover, Marina Biotech, also in May, exclusively licensed RNAi IP to Monsanto, and Tekmira mentioned in their last two conference calls that it was undertaking evaluative work with a large agricultural company: Monsanto or Syngenta?

The fact that Tekmira is involved in this business development opportunity for RNAi Therapeutics companies suggest that general RNAi IP is only one reason for Big Ag’s approach.

At first, this left me scratching my head: how would you apply double-strand RNA delivery by LNP in a commercially meaningful way in agriculture?  After some research though, it became obvious that Monsanto, Devgen and Syngenta are interested in using orally ingested dsRNA to fight insect pests such as the Western corn rootworm (WCR).  The need of finding new solutions for WCR has dramatically increased as the long-standing transgenic Bacillus thurigiensis toxin-incorporating crop by Monsanto has been plagued by resistance.

Another compelling reason for using non-transgenic approaches in agriculture is the fact that it should speed up the regulatory process as RNA is Generally Regarded as Safe (GRAS) by the FDA. This much reduces the hurdles compared to transgenic plants which might spread in the environment and further express biologically active proteins.  Moreover, unlike a toxin like Bt, the RNAi trigger can be highly specific to the targeted pest species.

The question, of course, is whether this approach, despite its attractions is technically and financially feasible in the first place.  The seminal work by Devgen and Monsanto (Baum et al., Nature Biotech2007) suggests that this is in fact the case: sub-nanogram per cm2 amounts of relatively cheap T7 in vitro transcribed RNA were sufficient to specifically and effectively silence essential genes in the entire body (!!!).  As a result, the growth inhibition caused by the pest was much reduced after ingesting the RNA.  I guess that the delivery work is aimed at even further reducing the required amount of RNA by a log or two.

The mechanism of this amazingly efficient gene silencing is likely the same as the early finding in nematode worms (another group of agriculturally important pests no less) that feeding them with E. coli bacteria expressing dsRNAs can cause potent and long-lasting silencing.  This phenomenon is referred to as ‘systemic RNAi’ and involves RNA amplification.  Although such systemic RNAi is unlikely to operate at the same high efficiency in all pest species, harnessing it in a species like WCR would already be highly commercially lucrative.  Monsanto apparently is close to commercializing such an RNAi-based insectizide.


Transkingdom RNAi and ddRNAi

When thinking about RNAi in plants, DNA-directed RNAi (ddRNAi) usually comes to mind, the type of RNAi where long hairpin RNAs are expressed from a transgene inserted into the host genome.  Certainly, a ddRNAi approach e.g. in corn against the same transgenes is also possible and indeed this has proven to be equally effective when compared to sprayable RNAi in the 2007 Nature Biotech paper.  It should also be added that unlike in your typical protein-expressing transgenic crop, ddRNAi per se does not involve transgenic protein expression, thereby lowering the regulatory hurdles.

When thinking about oral RNAi, especially in light of the RNAi history of feeding dsRNA-expressing bacteria to nematode worms (the first ‘transkingdom RNAi’ example), one may also consider the ‘Transkingdom’ RNAi technology by Marina Biotech (originally from Cequent).  One can speculate that Monsanto’s interest in Marina Biotech is related to this as part of a wider RNAi initiative by the Ag giant. An issue of feeding pests with such bacteria, however, is that again you release transgenic organisms into the wild.  While this may not be so much an environmental or health problem, you know that there are many out there that are religiously against anything ‘GM’, smashed windows and all.


Has Tekmira vs Alnylam been settled?

If we assume that LNP delivery is part of the package in the Alnylam-Monsanto deal and that Monsanto is the Ag company that has been working with Tekmira (until at least just two weeks ago), one can come up with at least three hypotheses for how the deal reflects on the Alnylam-Tekmira litigation:

1)     Tekmira and Alnylam competed, and Alnylam won;
2)     Monsanto will also tap Tekmira to cover all bases;
3)     There is an understanding that Alnylam will use the $30M to settle the lawsuit, and as part of the settlement/M&A, Monsanto will gain access to Tekmira technology.  Announcing the Monsanto deal before settlement is beneficial as it further bolsters Alnylam’s reputation and balance sheet. In that line of reasoning, the Regulus IPO should come SRTL.

The next weeks will tell.

2 comments:

@BioDueDiligence said...

Quick correction - the GRAS process is not governed by the FDA

Dirk Haussecker said...

BioDD...have a look at the following website: http://www.fda.gov/Food/FoodIngredientsPackaging/GenerallyRecognizedasSafeGRAS/default.htm

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