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David Manly
Journalism
Freelance Science Journalist
Toronto Ontario CAN

David Manly is a freelance journalist who will blog about a wide range of topics that all fall under the umbrella of zoology and ecology. While his expertise lies with reptiles and amphibians, he has a wide array of knowledge and interest in all animal species - from the sponge to the great ape. He hopes you will enjoy his blog, as he plans to make it both entertaining and enjoyable (as well as fill it with interesting facts, tidbits, photos and videos).

My posts are presented as opinion and commentary and do not represent the views of LabSpaces Productions, LLC, my employer, or my educational institution.

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Saturday, December 4, 2010

Are there aliens among us?

Short answer – No, at least not yet.

Despite the journalistic frenzy that was the NASA press conference held a few days ago, the paper published in the journal Science about a rather unique organism that was hailed as “extraterrestrial” by the news media fell short of its promise.

Sadly, the organism they discuss is clearly terrestrial, albeit an odd one.

In the paper, the author’s discuss a bacterium that was able to use the element arsenic instead of phosphorus, but I’m getting ahead of myself. First, a little information is needed regarding DNA.

DNA possesses a backbone of a phosphate bound to a sugar molecule. The phosphate is a phosphorous atom bound to four oxygen atoms. Now remember this, it is important.

Arsenic, which is directly below phosphorus on the periodic table, shares many of the same properties with phosphorous. In fact, arsenic can bind with four oxygen atoms to create arsenate, which behaves in a very similar way to phosphate.

Now, what the researchers did in the science paper was go to Mono Lake in California and find an “extremophile” bacteria, which is a bacteria that can survive in extremely harsh conditions (such as very high salt, temperature, high concentrations of acid, etc…). The scientists then isolated a strain of the bacteria in the lab and began to examine it.

In the lab, the researchers fed the bacteria essential nutrients, including phosphate, with little arsenic. Then, they gradually removed phosphate and replaced it with increasing concentrations of arsenic.

Over time, there was no phosphate left in the nutrients and only arsenic. By probing the DNA and proteins of the bacteria, they found that the organisms were using arsenate instead of phosphate.

Basically, they had created arsenic-based life. They did not find arsenic-based life, but had experimentally created it.

This is where the news media got it wrong.

It’s just like my mom when she got me to eat spinach. She would place a few leaves of spinach into a salad, saying it was a different type of lettuce, and I would eat it all together and not be able to tell the difference. Gradually, the salads became more and more spinach and less lettuce, until there was no lettuce left.

When asked if I liked the ‘salad’ and I replied with a big yes, did my mother admit that there was no lettuce in the salad - just spinach. From then on, I began to eat spinach.

See, the bacteria uses phosphate just like us. They prefer it!

But, they are adapted to live in Mono Lake, which has high concentrations of arsenic (the ability to survive there is amazing in and of itself), and can incorporate it into their biological mechanisms when absolutely necessary.

Also, by taking a look at a diagram from the paper below, you can see that all was not well with the arsenate bacteria. In fact, the arsenic bacteria (C) took longer to grow than their phosphate counterparts (D), despite their increased size.

 


Credit: Science

 

 

As well, the arsenic-reared bacteria had huge vacuoles (fluid filled sacs) within them. What those sacs mean is up to interpretation, as arsenic-based compounds are not very durable in water. Perhaps it was to segregate water from the fragile compounds?

Suffice to say, the discovery was cool, but it is not extraterrestrial life. It was alien, but not unlike a genetically altered E. coli or Drosophila.

Other questions also rise up regarding a phosphate-free existence:

-       What about ATP/ADP/AMP?

-       Were there traces amounts of phosphorous used in such low amounts that they were undetectable?

-       What about all other DNA replication, translation and transcription?

This research is interesting, and has some great potential, but is lightyears away from proof of extraterrestrial life.

Here is the paper from Science:

Wolfe-Simon, F., Blum, J., Kulp, T., Gordon, G., Hoeft, S., Pett-Ridge, J., Stolz, J., Webb, S., Weber, P., Davies, P., Anbar, A., & Oremland, R. (2010). A Bacterium That Can Grow by Using Arsenic Instead of Phosphorus Science DOI: 10.1126/science.1197258

Also, here is a great article written by Carl Zimmer about the discovery, where he actually interviewed the lead author and researcher in the paper:

http://blogs.discovermagazine.com/loom/

This post has been viewed: 937 time(s)

Blog Comments

Suzy
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David- thanks so much for this very clear explanation of the work and how it was done. I'd been seeing all the press releases, but as you say, they focus on the potential meaning instead of giving any real info.

You really broke it down - and better than any other article on the subject.

Thanks! You are brilliant!


CK
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Rosemary Redfield did a great critical analysis of the paper as well:

http://rrresearch.blogspot.com/2010/12/arsenic-associated-bacteria-nasas.html

Alan Boyle

Guest Comment

I could be wrong, but I think the descriptions of Figures C and D are reversed ... C shows the arsenic-rich bacteria, and D shows the phosphate-rich counterparts. The researchers suggest that the vacuoles may be one reason that the arsenic-rich bacteria are bigger.


Evie
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Great post David


David Manly
Freelance Science Journalist
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Thank you Alan, you are correct.

I just double-checked the paper with my post, and I have made the changes.

Thank you Jade, CK, Evie and Alan for the kind comments (especially you, Jade). This research was important, but just not as important and vital as the press made it seem.


Thomas Joseph
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Seems that there are some fatal flaws with this work that are now coming out. These organisms may not be using arsenic at all, and the media they used may have had phosphate contamination which allowed them to grow.


Suzy
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That's too bad. I hope they can prove the validity of their work!


David Manly
Freelance Science Journalist
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I've been keeping a close eye on this work, as more and more stuff has been revealed about the materials and methods used in this experiment.

Apparently, according to some people, the medium still has some phosphate in it, but only a small amount. As well as their inability to prove that arsenic was only sequestered, not integrated into the DNA and proteins as initially reported.

That's a shame, and I hope that this work is not complteely invalidated by overzealous reporting.


Thomas Joseph
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Well if it is invalidated it won't be because of overzealous reporting ... rather it'll be invalidated by poor experimental rigor.


genegeek
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Nicely done. I've been trying to think of best way to discuss - but you did it so well, I'll just point people here.


Evie
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Yea, I def agree w GeneGeek :)


David Manly
Freelance Science Journalist
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Awww, thanks Genegeek and Evie!!! :)

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