The Secrets Of Intelligence Lie Within A Single Cell

FourtySecondRip · 04-27-2010, 08:46 PM

Quote:

The microscopic world of the single, living cell mirrors our own in so many ways: cells are essentially autonomous, sentient and ingenious. In the lives of single cells we can perceive the roots of our own intelligence.

Molecular biology and genetics have driven the biosciences, but have not given us the miraculous new insights we were led to expect. From professional biologists to schoolchildren, people are concentrating on the minutiae of what goes on in the deepest recesses of the cell. For me, however, this misses out on life in the round: it is only when we look at the living cell as a whole organism that wonderful realities emerge that will alter our perception not only of how single cells enact their intricate lives but what we humans truly are.

The problem is that whole-cell biology is not popular. Microscopy is hell-bent on increased resolution and ever higher magnification, as though we could learn more about animal behaviour by putting a bacon sandwich under lenses of increasing power. We know much about what goes on within parts of a cell, but so much less about how whole cells conduct their lives.

Currently, cell biology deals largely with the components within cells, and systems biology with how the components interact. There is nothing to counterbalance this reductionism with a focus on how whole cells behave. Molecular biology and genetics are the wrong sciences to tackle the task.

Let's take a look at some of the evidence for ingenuity and intelligence in cells that is missing from the curriculum. Take the red algae Rhodophyta, in which many species carry out remarkable repairs to damaged cells. Cut a filament of Antithamnion cells so the cell is cut across and the cytoplasm escapes into the surrounding aquatic medium. All that remains are two fragments of empty, disrupted cell wall lying adjacent to, but separate from, each other. Within 24 hours, however, the adjacent cells have made good the damage, the empty cell space has been restored to full activity, and the cell walls meticulously realigned and seamlessly repaired.

The only place where this can happen is in the lab. In nature, the broken ends of the severed cell would nearly always end up remote from each other, so selection in favour of an automatic repair mechanism through Darwinian evolution would be impossible. Yet something amazing is happening here: because the damage to the Antithamnion filament is unforeseeable, the organism faces a situation for which it has not been able to adapt, and is therefore unable to call upon inbuilt responses. It has to use some sort of problem-solving ingenuity instead.

We regard amoebas as simple and crude. Yet many types of amoeba construct glassy shells by picking up sand grains from the mud in which they live. The typical Difflugia shell, for example, is shaped like a vase, and has a remarkable symmetry.

Compare this with the better known behaviour of a caddis fly larva. This maggot hunts around the bottom of the pond for suitable scraps of detritus with which to construct a home. Waterlogged wood is cemented together with pondweed until the larva has formed a protective covering for its nakedness. You might think this comparable to the home built by the testate amoeba, yet the amoeba lacks the jaws, eyes, muscles, limbs, cement glands and brain the caddis fly larva relies on for its skills. We just don't know how this single-celled organism builds its shell, and molecular biology can never tell us why. While the home of the caddis fly larva is crude and roughly assembled, that of the testate amoeba is meticulously crafted - and it's all made by a single cell.

The products of the caddis fly larva and the amoeba, and the powers of red algae, are about more than ingenuity: they pose important questions about cell intelligence. After all, whole living cells are primarily autonomous, and carry out their daily tasks with little external mediation. They are not subservient nanobots, they create and regulate activity, respond to current conditions and, crucially, take decisions to deal with unforeseen difficulties.

Whole living cells are not subservient nanobots, they respond and take decisions

Just how far this conceptual revolution about cells could take us becomes clearer with more complex animals, such as humans. Here, conventional wisdom is that everything is ultimately controlled by the brain. But cells in the liver, for example, reproduce at just the right rate to replace cells lost through attrition; follicular cells create new hair; bone marrow cells produce new circulating blood cells at a rate of millions per minute. And so on and on. In fact, around 90 per cent of this kind of cell activity is invisible to the brain, and the cells are indifferent to its actions. The brain is an irrelevance to most somatic cells.

So where does that leave the neuron, the most highly evolved cell we know? It ought to be in an interesting and privileged place. After all, neurons are so specialised that they have virtually abandoned division and reproduction. Yet we model this cell as little more than an organic transistor, an on/off switch. But if a red alga can "work out" how to solve problems, or an amoeba construct a stone home with all the "ingenuity" of a master builder, how can the human neuron be so lowly?

Unravelling brain structure and function has come to mean understanding the interrelationship between neurons, rather than understanding the neurons themselves. My hunch is that the brain's power will turn out to derive from data processing within the neuron rather than activity between neurons. And networks of neurons enhance the effect of those neurons "thinking" between themselves. I think the neuron's action potentials are rather like a language neurons use to transmit processed data from one to the next.

Back in 2004, we set out to record these potentials, from neurons cultured in the lab. They emit electrical signals of around 40 hertz, which sound like a buzzing, irritating noise played back as audio files. I used some specialist software to distinguish the signal within the noise - and to produce sound from within each peak that is closer to the frequency of a human voice and therefore more revealing to the ear.

Listening to the results reprocessed at around 300 Hz, the audio files have the hypnotic quality of sea birds calling. There is a sense that each spike is modulated subtly within itself, and it sounds as if there are discrete signals in which one neuron in some sense "addresses" another. Could we be eavesdropping on the language of the brain?

For me, the brain is not a supercomputer in which the neurons are transistors; rather it is as if each individual neuron is itself a computer, and the brain a vast community of microscopic computers. But even this model is probably too simplistic since the neuron processes data flexibly and on disparate levels, and is therefore far superior to any digital system. If I am right, the human brain may be a trillion times more capable than we imagine, and "artificial intelligence" a grandiose misnomer.

I think it is time to acknowledge fully that living cells make us what we are, and to abandon reductionist thinking in favour of the study of whole cells. Reductionism has us peering ever closer at the fibres in the paper of a musical score, and analysing the printer's ink. I want us to experience the symphony.Profile

Brian J. Ford is a research biologist based at Gonville and Caius College, University of Cambridge. He is a fellow of Cardiff University in the UK. His books include Sensitive Souls. This article is based on his paper in Interdisciplinary Science Reviews (vol 34, p 350)

Top image by Dan Webber. This post by Brian J. Ford originally appeared at New Scientist.

The Secrets Of Intelligence Lie Within A Single Cell - Science - io9

msicidron · 04-28-2010, 04:48 AM

**Mafoo** · 04-30-2010, 10:49 AM

we would never have gotten to the evolutionary form that we are in currently if our cells couldnt take care of ourselfs.

i look at the body in a similar fashion as a colony of bees or ants. they're 100% altruistic. every action from birth to death is performed for the benefit of the colony, i feel like there is STRONG selection for this type of behavior in nature. our cells do it but we as a species cant seem to work together toward anything.

really interesting article, thanks!

FourtySecondRip · 04-30-2010, 12:09 PM

good point mafoo we got this amazing ability to be the one thing in charge of all these billions of cells in our body but now we are like lotto winners who go bankrupt in 5 years

i wonder if the carbon in my elbow or shoulder had grown to be my brain instead as a baby if i would be a different person. like i wonder if the specific cells that make up our brains have any direct connection to our consciousness or if its like plug and play where any cells woulda ended up the same way because of dna.

**Mafoo** · 04-30-2010, 12:19 PM

well i kinda know the answer to that. sperm and egg meet, a zygote is formed. its basically a clump of cells all of which contain your entire genetic code. as they divide they form whats known as a gastrula. at this point the cells begin to differentiate, they become specialized. the exact mechanism isnt known, but somehow the DNA is altered so that it only expresses the genes necessary for that cell type. the cells form 3 germ layers, endoderm, mesoderm, and ectoderm. all the tissues in your body are derived from 1 of these layers, muscles from the mesoderm etc. so its not really possible to say how things would be if your elbow became your brain because the cells that make up your brain and elbow were "transformed" into those cell types long before your body resembled its current form.

04-28-2010, 04:48 AM	#2 (permalink)
msicidron vibing Join Date: May 2007 Location: North America Posts: 959 Thanks: 229 Thanked 157 Times in 122 Posts	<object width="480" height="385"><param name="movie" value="http://www.youtube.com/v/oWLpWmiHzIc&hl=en_US &fs=1&rel=0&color1=0 x234900&color2=0x4e9 e00"></param><param name="allowFullScree n" value="true"></param><param name="allowscriptacc ess" value="always"></param><embed src="http://www.youtube.com/v/oWLpWmiHzIc&hl=en_US &fs=1&rel=0&color1=0 x234900&color2=0x4e9 e00" type="application/x-shockwave-flash" allowscriptaccess="a lways" allowfullscreen="tru e" width="480" height="385"></embed></object> __________________ \|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|\|

04-30-2010, 10:49 AM	#3 (permalink)
Mafoo nice daze Join Date: Nov 2005 Location: the anguish of anticipated transformation Posts: 5,975 Thanks: 3,776 Thanked 2,652 Times in 1,698 Posts	we would never have gotten to the evolutionary form that we are in currently if our cells couldnt take care of ourselfs. i look at the body in a similar fashion as a colony of bees or ants. they're 100% altruistic. every action from birth to death is performed for the benefit of the colony, i feel like there is STRONG selection for this type of behavior in nature. our cells do it but we as a species cant seem to work together toward anything. really interesting article, thanks! __________________ PLUR For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return

04-30-2010, 12:09 PM	#4 (permalink)
FourtySecondRip ECS Join Date: May 2002 Location: Emerald City Posts: 820 Thanks: 25 Thanked 107 Times in 87 Posts	good point mafoo we got this amazing ability to be the one thing in charge of all these billions of cells in our body but now we are like lotto winners who go bankrupt in 5 years i wonder if the carbon in my elbow or shoulder had grown to be my brain instead as a baby if i would be a different person. like i wonder if the specific cells that make up our brains have any direct connection to our consciousness or if its like plug and play where any cells woulda ended up the same way because of dna. __________________ ..,,,O,,,.. <\FSR/> .,._/\_.,

04-30-2010, 12:19 PM	#5 (permalink)
Mafoo nice daze Join Date: Nov 2005 Location: the anguish of anticipated transformation Posts: 5,975 Thanks: 3,776 Thanked 2,652 Times in 1,698 Posts	well i kinda know the answer to that. sperm and egg meet, a zygote is formed. its basically a clump of cells all of which contain your entire genetic code. as they divide they form whats known as a gastrula. at this point the cells begin to differentiate, they become specialized. the exact mechanism isnt known, but somehow the DNA is altered so that it only expresses the genes necessary for that cell type. the cells form 3 germ layers, endoderm, mesoderm, and ectoderm. all the tissues in your body are derived from 1 of these layers, muscles from the mesoderm etc. so its not really possible to say how things would be if your elbow became your brain because the cells that make up your brain and elbow were "transformed" into those cell types long before your body resembled its current form. __________________ PLUR For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return

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