Anthony (Counter Culture Labs)
We need an Open Source Insulin! We need a team to be able to start investigating methods that could be used to increase the yield, and decrease the post-expression processing steps currently required to produce insulin.
Meow
I've got a team in mind.
Nick
USYD iGEMers- what do you think?
Team DISCO
We can do that! iGEM is an international competition where teams across the world create and deposit genetic sequences into an open source registry, so that the global community can follow on from a single team’s work.
Meow
That’s fantastic! Keep me updated throughout the project, I’m more than happy to help with this process if I can. Also, good luck with the competition!
After researching insulin a little further, we’ve come to realise that there are a few issues we’d like to address.
Firstly, Human insulin purification takes a long time and, depending on the method used, can be very expensive. We investigated alternatives to this process, and we came up with a few expression systems that could be used to improve the folding of insulin inside Escherichia coli and Bacillus subtilis.
Secondly, insulin is currently stored at 4°C to preserve its activity. Keeping insulin at this temperature in cold storage chains while it’s being transported is incredibly difficult. This is especially so in lower economic countries, where we hope our insulin will be able to be sold.
So we thought, what if we designed our own, single chain, open source insulin that is also thermostable?
Neil
Hi! As a part of the not-for-profit group
Insulin for Life, I currently work to export insulin from Australia to all corners of the globe. We haven’t had any issues with the activity of the insulin we distribute, even though we don’t use any cold chain transportation. I think that any insulin you design, just like the human insulin you’re looking to produce, will be thermostable enough for global transportation without cold storage.
Team DISCO
Oh wow! Thanks Neil for your input. That gives us a lot of confidence to say that our insulins should be able to be distributed without cold chain transportation!
Jeri
Also, just be careful with how much you adapt the insulin you design. Endocrinologists are hesitant to put their patients on biosimilars because they can never be taken off that specific biosimilar. Generally, if a person is taken off one insulin biosimilar and put on a different analogue, they will suffer from an allergic reaction to the new insulin!
Team DISCO
Well we’d better make sure that our insulin is classified as an analogue, not a biosimilar. Unfortunately, Human Insulin will be classified as a biosimilar, but we have designed it to be exactly the same as the human form. Since there aren’t any ‘other’ bits on Human insulin like His-tags or TEV digestion sites, we hypothesise that there will be no adverse reactions or allergies brought on by Human Insulin.
Len
Would you like some quick tips on how to figure out if the insulin you’ve designed is ‘new to market,’ or whether you’re unintentionally infringing an active patent?
Team DISCO
Yes please! We have designed a single chain insulin with a 12 amino acid length linker between the A and B chains, and have made no changes to the human insulin A chain. We have added a glycine to the B chain, as this immensely increases stability.
Len
After checking whether or not your patient is currently active and, if so, where it is active, the main thing you need to read is the claims. If your product fits 100% of the key criteria outlined in a single claim, then you are infringing the patent and could be open to a law suit. However, if your product differs from that claim at all, then you are outside the scope of that claim and are not infringing on it.
Team DISCO
Which patents should we be looking at to figure out whether we are infringing or not?
Len
If I were you, I’d consider all the insulins on the market, particularly focusing on single chain Insulins. We already know that human insulin itself is off patent, but you may want to check that subsequent patents on insulin production methodology weren’t filed and are still active today. Checking method patents in general, especially for your Bacillus expression system, would be important too. Inventive steps in methods are generally patented.
Team DISCO
We definitely need to design our insulin after we check all of the relevant patents for single chain insulins. Expression systems and methodology should then follow. How long would it take, and about how much would it cost for your firm to investigate this for us?
Len
Investigating whether or not a product is “new” would generally take a full year, and cost about AU$100,000.
Team DISCO
Ah, that’s a lot of money and time!
Edwina
Also, if I had to choose between short or long acting, I would probably go for a short acting insulin for someone living in a developing country. Long acting insulins wouldn’t stabilise blood sugar levels in people who only eat sparse meals.
Team DISCO
Wow, that’s so helpful! Since you can’t have the same insulin being short AND long acting, its good to aim to create an insulin that’s one or the other. Ruby will be able to do some cool
modelling to predict whether our Winsulin will be short-acting or long-acting!!
Ultimately, we have two insulin products. Our first insulin, Human Insulin, will be exactly the same as the one we produce in our human beta cells. Our other insulin, our newly designed insulin Winsulin, will have the same A and B chains as Human Insulin, but contains a smaller, 12 amino acid length C peptide linker.
From our predictive modelling, we predict the Winsulin will be a short acting insulin, as advised. We also believe that our Winsulin will not fall into the ‘biosimilar’ category, as it is not simply an adaptation on a current market therapy, but an entirely new design altogether.