Editing Team:Oxford/Practices

Practices

Introduction

Our project relies on a three way conversation between the team, the public and experts. It touches every aspect of the project, from our choice of application to the details of our delivery system. We promoted Synthetic Biology and iGEM through outreach programs to inspire the next generation.

Urinary tract infections are a huge problem globally with millions of cases reported each year. We’re producing a guide for everything you need to know about urinary tract infections, as well as a treatment to replace antibiotics, which are rapidly becoming ineffective.

We want to make our website as accessible as possible to all readers, regardless of their level of expertise. Words with a dotted blue underline will show a definition when you hover over them.

Project Choice

Approaching the Public

To decide on our project idea, we sent out an initial questionnaire to the public to hear about what they thought about synthetic biology. We asked what big problems they wanted solving. We took the questionnaire to schools, to the streets and to our friends.

Examples of their suggestions for the applications of synthetic biology included bacteria which:

  • Remove carbon dioxide from the atmosphere
  • Target and kill cancerous cells
  • Help treat Alzheimer's disease
  • Produce energy
  • Sew up holes in clothes
  • Produce teeth glue
  • Indicate how long someone has been dead for
  • Combat antibiotic resistance

Of our responses, around 40 were related to Medicine and Health [1]. This led us to choose that track for our project. However, it was our team member George Driscoll’s work at the UTI clinic in London which helped us to select antibiotic resistance as the problem we needed to tackle. We found that focusing on treatment for catheter-associated UTIs would be a more manageable goal for the summer, as opposed to trying to find a blanket UTI treatment! Due to the unaesthetic nature of the infection, it often receives less attention with regard to research.

Our Inspiration

Having honed in on a possible project choice, we visited two hospitals in our area to find out more about the current treatment for CAUTIs, and what medical professionals thought of our project idea.

Churchill Hospital, Oxford

Our first visit to the hospital was to the outpatient clinic during which we spoke with Jan, one of the nurses on the ward. Jan told us about a case of a person getting septicaemia as a result of a urinary infection. The patient had received antibiotics for seven days and had come back for a check up. Their urine sample was clear and all seemed fine but then the patient had started to shake. The bacteria were now in their blood as it had travelled back up the ureter to the kidney. Even though this was a rare case, it was shocking to hear about such a serious case and made our project feel very relevant.

Jan also made the following points:

  • People with infections have a catheter because they need a way to empty the bladder; else the urine travels up the ureter and back into the bladder
  • If a patient becomes septic the catheter has to be removed or CAUTI can be fatal
  • UTIs are not just contracted through catheterisation, and it is important to also consider community based UTIs
  • A key quote which stuck with us: “UTIs are very common and can be quite painful”
  • There is no ward solely for UTI sufferers
  • The protocol for treatment is to take a urine sample, see if there is an infection, and prescribe antibiotics that the bacteria are most sensitive to
  • Elderly hospital wards are likely to have many cases of UTIs

We took a lot from this initial conversation. We went on to investigate the pros and cons of the current methods of CAUTI treatment, and compare these to what Solution could offer. Following this meeting, the Design of the catheter became an integral part of our project.

John Radcliffe Hospital, Oxford

We still wanted to learn more about urinary infections as well as to get some feedback from nurses about our idea. We organized a trip to the Adams Ward (Geratology) to learn more about how UTIs affect elderly people.

First interview with Laura Evans, Adams Ward

What is the procedure for treating UTIs?

  1. Dip urine to test for the presence of bacterial colonies
  2. If the test comes back as positive, the patient is treated with a wide spectrum antibiotic
  3. Whether or not the catheter is inserted with prophylactic antibiotic treatment is the doctor’s decision

What happens when a catheterised patient tests positive for a UTI?

Whether or not the catheter is removed if a patient tests positive for a UTI depends largely on the reason that the catheter has been fitted. In most cases, the catheter remains fitted and the patient is treated with a large dose of antibiotics.

Is antibiotic resistance a problem?

Yes, particularly on this ward. As we treat elderly patients with recurring infections, the uropathogens they succumb to are often resistant to antibiotic treatment. As a result, we have to try different combinations of antibiotics, but in many cases this does not stop recurrences of the infection.

Our project involves designing a catheter that prevents the formation of a biofilm on its surface. What do you think of this idea?

A catheter like that would be useful, but it depends on how long your catheter would work for. Patients can have a single catheter fitted for 3 months or longer. Catheters are also removed for other reasons, for example if they become blocked. Catheter blockage is a common issue for patients suffering from UTIs.

Laura’s response regarding how long a catheter remains in place inspired us to research how we could keep our Solution bacteria alive.

The Problem

Following our inspiring visits to the Churchill and John Radcliffe hospitals, we wanted to find out the public thought about the problem of antibiotic resistance. We posed the question: To what extent do you feel that antibiotic resistance is a problem that needs addressing in society today?

Our survey clearly shows that, according to the general public, antibiotic resistance is an important problem that needs solving. Therefore we felt it was a useful area to direct our project towards. One of our team members, George, worked in a UTI clinic over the summer of 2014, so he knows first-hand that UTIs are a big problem for a lot of people and that, in severe cases, current methods of treatment are inadequate. When he brought this to our attention, we thought it was worthwile trying to find a solution to this problem.

Feedback from Oxford Experts

To gain a further insight into the feasibility of Solution, we gave two talks during the summer, one at the termly Corpus Christi College Biochemistry talks and another to a group of alumni from the Oxford Biochemistry department. Two important questions arose from these talks:

  • Have you considered whether the proteins you planning on secreting are immunogenic?
  • If you are to kill all of the pathogenic bacteria in the urinary tract, will that make fungal infections more likely?

Our Solution

Given these data, we decided to develop a new treatment for CAUTIs, using antimicrobials instead of antibiotics, which would be an important step in combatting antibiotic resistance.

Project Viability

Now that we had decided on our project choice, we needed to find out if it would be feasible and, if so, what obstacles we would need to overcome.

Bacterial Sustainability

We made our first steps in the right direction after visiting the Bedford Ward at the John Radcliffe Hospital. We spoke with one of the catheterised patients there called Mavis. She admitted to having had urinary infections in the past, but said she had not contracted a UTI since having a catheter fitted.

We found that Mavis would possibly use the same catheter for up to 10 weeks. This enforced the importance of being able to keep our bacteria alive for a sustained period of time. When we asked her about treating infection with bacteria she said she would be happy to if it had been recommended to her by a doctor and told us that it is not dissimilar to using antibiotics.

Ethics

To find out the public opinion on our project, we sent out a questionnaire to over 150 people, asking: If your doctor recommended a treatment for an infection, which involved the use of bacteria that had been engineered to treat the infection, would you use it? We also asked this question to a number of medical professionals during our visits to hospitals and clinics.

Whilst the majority of feedback was very positive, we did encounter some valuable criticism, as shown in the graph below. Most medical professionals we spoke to had positive responses, though one nurse did have certain reservations about our idea.

This proportion of negative feedback, although small, highlighted to us that our dialogue with the public needed to be improved. We believe that, through improving people's understanding of our project, we can convince pessimists that genetic engineering is now a force for good. This also led us onto holding talks to student groups, which you can find in the Increasing Awareness section below.

Nevertheless, this is very encouraging data for our project, and again highlights the importance of gaining support from doctors, because without their backing, this project is likely never to become as common a treatment as antibiotics.

The UTI Clinic

Delivery Method

Now that we had focused our project towards treatment of CAUTIs, we needed a suitable catheter design. We needed some method by which we could expose the catheter, and bladder, to our anti-microbial proteins, and in a safe manner.

First, we considered the idea of having our bacteria implanted within the patient, in the confines of the catheter. It was of paramount importance that we make sure the bacteria would be safely contained, and not be able to escape into the bladder to cause further infection.

Our team member Ria Dinsdale made the suggestion of using sol-gel as a possible method of containment. Despite being a very convincing idea, we found that it would be too difficult to design under the time restraints of the summer.

However, we subseqently found an alternative containment method, which we resurrected from the Oxford iGEM 2014 project 'DCMation'. Our predecessors' project also had to find a method of bacterial containment.

BioBeads

First attempt at making the beads using Sodium Alginate

The 2014 team encapsulated their bacteria in agarose to form BioBeads. These BioBeads were then given an outer coating of cellulose acetate, to allow flow of molecules into and out of the bead, whilst preventing the escape of their bacteria.

This year, we have been able to significantly improve the BioBead concept, by changing our inner material to sodium alginate, and our outer material to polystyrene; something which is still a work in progress. For full details on our developements on BioBeads, check out our Design page!

Catheter design

Currently catheters are very cheap to produce, find out how much, therefore as part of our project we decided to look into how we could introduce the beads into the pipe during the manufacturing process.

Manufacturing idea from mechanical engineer Steven Dinsdale

We spoken to a mechanical engineer, Steven Dinsdale, and he help us with a design for a machine that could do this. The machine would use the technique of extrusion to make the tube and then a second cooled inflow tube would introduce the beads.

This would hopefully keep the bacteria cool enough so they are not killed yet the polymer would be hot enough to melt and then form the tube.

Potential problems:

  • If this design were used for catheter production the bacteria would potentially not survive the sterilisation process at the end of the manufacturing.
  • Steps further down in the manufacturing process could harm out bacteria.
  • The bacteria may not survive in storage due to the length of time stored, temperature, etc

Increasing Awareness

In an attempt to improve the general public's understanding of Synthetic Biology, we used a variety of approaches. We hope these events helped people, perhaps who represent the 6% of pessimists we found in an earlier survey, to fully understand the concepts of genetic engineering, and realise the incredible gains that can be made from projects like ours in the field of synthetic biology.

UNIQ Workshop

Duke discusses the central dogma with UNIQ Summer School

We met with 40 prospective Oxford students to teach them about Synthetic Biology. The students had in interest in Biochemistry but knew nothing about iGEM.

We hammered home the key message of Synthetic Biology - that we achieve more progress by expanding a registry of standardised biological parts - through a 15 minute introductory presentation on BioBricks.

We then split them into groups and gave each one a mentor from our iGEM team. We worked through questions to test their understanding in a tutorial style and asked them to explain the constructs of previous iGEM teams. They finished by presenting their findings to each other.

UTC Oxfordshire

A couple of us gave a presentation on antibiotic resistance to a class of GCSE students from UTC Oxfordshire (a local school specialising in science) at the Natural History Museum in Oxford, The Pitt Rivers Museum.

Our talk covered the discovery of antibiotics, the advantages of them (including their use in laboratory work), how they work, and how bacteria can evolve to gain resistance to them, as well as concepts such as horizontal gene transfer and the consequences of antibiotic resistance on our everyday lives. It also covered our project outline, and pros and cons of Solution, showing how it should help combat antibiotic resistance.

At the end, we held a discussion between the students and our team about antibiotic resistance, and their perception of the concern. We also asked how they would feel about using our engineered bacteria, and the response was positive, with most of the students saying that if their doctor recommended the treatment, they would be open to using it.

BBC Radio Oxford

We were invited to talk about antibiotic resistance on BBC Radio Oxford. We went on the Kat Orman's morning show, alongside Monty Python's Michael Palin, and spoke about the increasing threat that antibiotic resistance poses, and what we're doing to combat it. We were asked questions about why we chose this area to pursue, whether our project was likely to be lincensed, and about the basics of synthetic biology.

Mabel and Helen in the studio with Kat Orman!

We answered this by using the analogy of computer hardware: if your computer hard drive is broken, you can buy a new model from the shop without worrying about whether it will fit or not, and it's the same with stretches of DNA sequence that you can stick together. We were also asked about our outreach and the efforts we were making to change the mindset of a society that demands to be prescribed antibiotics.

Finally, Kat ended by asking we thought we could change the world with our project. After a little nervous laughter, we gave her an answer: "hopefully!". Our section begins 1hr 6mins into the 3 hour show. Click here to have a listen!