TEDGlobal 2011
Lee Cronin: Making matter come alive
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Before life existed on Earth, there was just matter, inorganic dead "stuff." How improbable is it that life arose? And -- could it use a different type of chemistry? Using an elegant definition of life (anything that can evolve), chemist Lee Cronin is exploring this question by attempting to create a fully inorganic cell using a "Lego kit" of inorganic molecules -- no carbon -- that can assemble, replicate and compete.
Lee Cronin - Chemist
A professor of chemistry, nanoscience and chemical complexity, Lee Cronin and his research group investigate how chemistry can revolutionize modern technology and even create life. Full bio
A professor of chemistry, nanoscience and chemical complexity, Lee Cronin and his research group investigate how chemistry can revolutionize modern technology and even create life. Full bio
Double-click the English transcript below to play the video.
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What I'm going to try and do in the next 15 minutes or so
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is tell you about an idea
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of how we're going to make matter come alive.
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Now this may seem a bit ambitious,
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but when you look at yourself, you look at your hands,
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you realize that you're alive.
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So this is a start.
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Now this quest started four billion years ago on planet Earth.
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There's been four billion years
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of organic, biological life.
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And as an inorganic chemist,
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my friends and colleagues make this distinction
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between the organic, living world
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and the inorganic, dead world.
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And what I'm going to try and do is plant some ideas
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about how we can transform inorganic, dead matter
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into living matter, into inorganic biology.
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Before we do that,
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I want to kind of put biology in its place.
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And I'm absolutely enthralled by biology.
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I love to do synthetic biology.
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I love things that are alive.
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I love manipulating the infrastructure of biology.
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But within that infrastructure,
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we have to remember
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that the driving force of biology
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is really coming from evolution.
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And evolution,
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although it was established well over 100 years ago by Charles Darwin
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and a vast number of other people,
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evolution still is a little bit intangible.
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And when I talk about Darwinian evolution,
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I mean one thing and one thing only,
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and that is survival of the fittest.
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And so forget about evolution
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in a kind of metaphysical way.
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Think about evolution
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in terms of offspring competing,
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and some winning.
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So bearing that in mind,
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as a chemist, I wanted to ask myself
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the question frustrated by biology:
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What is the minimal unit of matter
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that can undergo Darwinian evolution?
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And this seems quite a profound question.
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And as a chemist,
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we're not used to profound questions every day.
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So when I thought about it,
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then suddenly I realized
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that biology gave us the answer.
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And in fact, the smallest unit of matter
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that can evolve independently
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is, in fact, a single cell --
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a bacteria.
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So this raises three really important questions:
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What is life?
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Is biology special?
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Biologists seem to think so.
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Is matter evolvable?
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Now if we answer those questions in reverse order,
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the third question -- is matter evolvable? --
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if we can answer that,
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then we're going to know how special biology is,
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and maybe, just maybe,
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we'll have some idea of what life really is.
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So here's some inorganic life.
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This is a dead crystal,
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and I'm going to do something to it,
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and it's going to become alive.
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And you can see,
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it's kind of pollinating, germinating, growing.
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This is an inorganic tube.
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And all these crystals here under the microscope
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were dead a few minutes ago, and they look alive.
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Of course, they're not alive.
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It's a chemistry experiment where I've made a crystal garden.
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But when I saw this, I was really fascinated,
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because it seemed lifelike.
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And as I pause for a few seconds, have a look at the screen.
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You can see there's architecture growing, filling the void.
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And this is dead.
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So I was positive that,
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if somehow we can make things mimic life,
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let's go one step further.
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Let's see if we can actually make life.
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But there's a problem,
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because up until maybe a decade ago,
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we were told that life was impossible
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and that we were the most incredible miracle in the universe.
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In fact, we were the only people
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in the universe.
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Now, that's a bit boring.
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So as a chemist,
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I wanted to say, "Hang on. What is going on here?
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Is life that improbable?"
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And this is really the question.
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I think that perhaps the emergence of the first cells
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was as probable as the emergence of the stars.
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And in fact, let's take that one step further.
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Let's say
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that if the physics of fusion
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is encoded into the universe,
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maybe the physics of life is as well.
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And so the problem with chemists --
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and this is a massive advantage as well --
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is we like to focus on our elements.
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In biology, carbon takes center stage.
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And in a universe where carbon exists
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and organic biology,
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then we have all this wonderful diversity of life.
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In fact, we have such amazing lifeforms that we can manipulate.
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We're awfully careful in the lab
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to try and avoid various biohazards.
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Well what about matter?
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If we can make matter alive, would we have a matterhazard?
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So think, this is a serious question.
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If your pen could replicate,
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that would be a bit of a problem.
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So we have to think differently
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if we're going to make stuff come alive.
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And we also have to be aware of the issues.
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But before we can make life,
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let's think for a second
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what life really is characterized by.
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And forgive the complicated diagram.
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This is just a collection of pathways in the cell.
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And the cell is obviously for us
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a fascinating thing.
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Synthetic biologists are manipulating it.
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Chemists are trying to study the molecules to look at disease.
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And you have all these pathways going on at the same time.
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You have regulation;
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information is transcribed;
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catalysts are made; stuff is happening.
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But what does a cell do?
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Well it divides, it competes,
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it survives.
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And I think that is where we have to start
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in terms of thinking about
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building from our ideas in life.
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But what else is life characterized by?
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Well, I like think of it
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as a flame in a bottle.
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And so what we have here
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is a description of single cells
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replicating, metabolizing,
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burning through chemistries.
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And so we have to understand
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that if we're going to make artificial life or understand the origin of life,
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we need to power it somehow.
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So before we can really start to make life,
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we have to really think about where it came from.
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And Darwin himself mused in a letter to a colleague
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that he thought that life probably emerged
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in some warm little pond somewhere --
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maybe not in Scotland, maybe in Africa,
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maybe somewhere else.
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But the real honest answer is, we just don't know,
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because there is a problem with the origin.
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Imagine way back, four and a half billion years ago,
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there is a vast chemical soup of stuff.
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And from this stuff we came.
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So when you think about the improbable nature
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of what I'm going to tell you in the next few minutes,
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just remember,
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we came from stuff on planet Earth.
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And we went through a variety of worlds.
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The RNA people would talk about the RNA world.
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We somehow got to proteins and DNA.
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We then got to the last ancestor.
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Evolution kicked in -- and that's the cool bit.
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And here we are.
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But there's a roadblock that you can't get past.
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You can decode the genome, you can look back,
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you can link us all together by a mitochondrial DNA,
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but we can't get further than the last ancestor,
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the last visible cell
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that we could sequence or think back in history.
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So we don't know how we got here.
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So there are two options:
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intelligent design, direct and indirect --
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so God,
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or my friend.
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Now talking about E.T. putting us there, or some other life,
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just pushes the problem further on.
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I'm not a politician, I'm a scientist.
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The other thing we need to think about
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is the emergence of chemical complexity.
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This seems most likely.
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So we have some kind of primordial soup.
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And this one happens to be
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a good source of all 20 amino acids.
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And somehow
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these amino acids are combined,
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and life begins.
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But life begins, what does that mean?
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What is life? What is this stuff of life?
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So in the 1950s,
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Miller-Urey did their fantastic chemical Frankenstein experiment,
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where they did the equivalent in the chemical world.
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They took the basic ingredients, put them in a single jar
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and ignited them
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and put a lot of voltage through.
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And they had a look at what was in the soup,
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and they found amino acids,
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but nothing came out, there was no cell.
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So the whole area's been stuck for a while,
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and it got reignited in the '80s
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when analytical technologies and computer technologies were coming on.
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In my own laboratory,
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the way we're trying to create inorganic life
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is by using many different reaction formats.
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So what we're trying to do is do reactions --
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not in one flask, but in tens of flasks,
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and connect them together,
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as you can see with this flow system, all these pipes.
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We can do it microfluidically, we can do it lithographically,
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we can do it in a 3D printer,
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we can do it in droplets for colleagues.
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And the key thing is to have lots of complex chemistry
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just bubbling away.
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But that's probably going to end in failure,
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so we need to be a bit more focused.
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And the answer, of course, lies with mice.
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This is how I remember what I need as a chemist.
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I say, "Well I want molecules."
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But I need a metabolism, I need some energy.
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I need some information, and I need a container.
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Because if I want evolution,
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I need containers to compete.
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So if you have a container,
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it's like getting in your car.
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"This is my car,
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and I'm going to drive around and show off my car."
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And I imagine you have a similar thing
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in cellular biology
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with the emergence of life.
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So these things together give us evolution, perhaps.
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And the way to test it in the laboratory
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is to make it minimal.
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So what we're going to try and do
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is come up with an inorganic Lego kit of molecules.
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And so forgive the molecules on the screen,
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but these are a very simple kit.
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There's only maybe three or four different types of building blocks present.
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And we can aggregate them together
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and make literally thousands and thousands
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of really big nano-molecular molecules
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the same size of DNA and proteins,
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but there's no carbon in sight.
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Carbon is banned.
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And so with this Lego kit,
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we have the diversity required
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for complex information storage
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without DNA.
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But we need to make some containers.
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And just a few months ago in my lab,
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we were able to take these very same molecules and make cells with them.
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And you can see on the screen a cell being made.
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And we're now going to put some chemistry inside and do some chemistry in this cell.
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And all I wanted to show you
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is we can set up molecules
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in membranes, in real cells,
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and then it sets up a kind of molecular Darwinism,
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a molecular survival of the fittest.
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And this movie here
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shows this competition between molecules.
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Molecules are competing for stuff.
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They're all made of the same stuff,
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but they want their shape to win.
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They want their shape to persist.
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And that is the key.
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If we can somehow encourage these molecules
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to talk to each other and make the right shapes and compete,
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they will start to form cells
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that will replicate and compete.
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If we manage to do that,
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forget the molecular detail.
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Let's zoom out to what that could mean.
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So we have this special theory of evolution
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that applies only to organic biology, to us.
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If we could get evolution into the material world,
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then I propose we should have a general theory of evolution.
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And that's really worth thinking about.
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Does evolution control
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the sophistication of matter in the universe?
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Is there some driving force through evolution
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that allows matter to compete?
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So that means we could then start
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to develop different platforms
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for exploring this evolution.
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So you imagine,
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if we're able to create a self-sustaining artificial life form,
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not only will this tell us about the origin of life --
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that it's possible that the universe doesn't need carbon to be alive;
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it can use anything --
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we can then take [it] one step further and develop new technologies,
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because we can then use software control
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for evolution to code in.
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So imagine we make a little cell.
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We want to put it out in the environment,
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and we want it to be powered by the Sun.
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What we do is we evolve it in a box with a light on.
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And we don't use design anymore. We find what works.
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We should take our inspiration from biology.
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Biology doesn't care about the design
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unless it works.
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So this will reorganize
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the way we design things.
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But not only just that,
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we will start to think about
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how we can start to develop a symbiotic relationship with biology.
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Wouldn't it be great
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if you could take these artificial biological cells
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and fuse them with biological ones
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to correct problems that we couldn't really deal with?
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The real issue in cellular biology
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is we are never going to understand everything,
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because it's a multidimensional problem put there by evolution.
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Evolution cannot be cut apart.
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You need to somehow find the fitness function.
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And the profound realization for me
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is that, if this works,
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the concept of the selfish gene gets kicked up a level,
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and we really start talking about selfish matter.
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And what does that mean in a universe
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where we are right now the highest form of stuff?
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You're sitting on chairs.
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They're inanimate, they're not alive.
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But you are made of stuff, and you are using stuff,
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and you enslave stuff.
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So using evolution
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in biology,
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and in inorganic biology,
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for me is quite appealing, quite exciting.
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And we're really becoming very close
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to understanding the key steps
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that makes dead stuff come alive.
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And again, when you're thinking about how improbable this is,
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remember, five billion years ago,
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we were not here, and there was no life.
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So what will that tell us
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about the origin of life and the meaning of life?
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But perhaps, for me as a chemist,
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I want to keep away from general terms;
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I want to think about specifics.
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So what does it mean about defining life?
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We really struggle to do this.
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And I think, if we can make inorganic biology,
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and we can make matter become evolvable,
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that will in fact define life.
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I propose to you
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that matter that can evolve is alive,
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and this gives us the idea of making evolvable matter.
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Thank you very much.
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(Applause)
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Chris Anderson: Just a quick question on timeline.
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You believe you're going to be successful in this project?
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When?
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Lee Cronin: So many people think
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that life took millions of years to kick in.
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We're proposing to do it in just a few hours,
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once we've set up
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the right chemistry.
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CA: And when do you think that will happen?
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LC: Hopefully within the next two years.
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CA: That would be a big story.
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(Laughter)
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In your own mind, what do you believe the chances are
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that walking around on some other planet
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is non-carbon-based life,
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walking or oozing or something?
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LC: I think it's 100 percent.
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Because the thing is, we are so chauvinistic to biology,
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if you take away carbon, there's other things that can happen.
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So the other thing
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that if we were able to create life that's not based on carbon,
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maybe we can tell NASA what really to look for.
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Don't go and look for carbon, go and look for evolvable stuff.
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CA: Lee Cronin, good luck. (LC: Thank you very much.)
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(Applause)
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ABOUT THE SPEAKER
Lee Cronin - ChemistA professor of chemistry, nanoscience and chemical complexity, Lee Cronin and his research group investigate how chemistry can revolutionize modern technology and even create life.
Why you should listen
Lee Cronin's lab at the University of Glasgow does cutting-edge research into how complex chemical systems, created from non-biological building blocks, can have real-world applications with wide impact. At TEDGlobal 2012, Cronin shared some of the lab's latest work: creating a 3D printer for molecules. This device -- which has been prototyped -- can download plans for molecules and print them, in the same way that a 3D printer creates objects. In the future, Cronin says this technology could potentially be used to print medicine -- cheaply and wherever it is needed. As Cronin says: "What Apple did for music, I'd like to do for the discovery and distribution of prescription drugs."
At TEDGlobal 2011, Cronin shared his lab's bold plan to create life. At the moment, bacteria is the minimum unit of life -- the smallest chemical unit that can undergo evolution. But in Cronin's emerging field, he's thinking about forms of life that won't be biological. To explore this, and to try to understand how life itself originated from chemicals, Cronin and others are attempting to create truly artificial life from completely non-biological chemistries that mimic the behavior of natural cells. They call these chemical cells, or Chells.
Cronin's research interests also encompass self-assembly and self-growing structures -- the better to assemble life at nanoscale. At the University of Glasgow, this work on crystal structures is producing a raft of papers from his research group. He says: "Basically one of my longstanding research goals is to understand how life emerged on planet Earth and re-create the process."
Read the papers referenced in his TEDGlobal 2102 talk:
Integrated 3D-printed reactionware for chemical synthesis and analysis, Nature Chemistry
Configurable 3D-Printed millifluidic and microfluidic ‘lab on a chip’ reactionware devices, Lab on a Chip
Lee Cronin | Speaker | TED.com