Tom Hendricks
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 Posted: Mon Oct 06, 2008 11:15 pm Post subject: What about life under the see and UV |
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We are now finding life not at the bottom of the sea, but way underneath the sea. It may be a sizable percentage of all life.
I ask the SBE group this question. Does anyone know if the genomes of these undersea bacteria, have UV repair mechanisms.
I ask that to see if they are land life that has gone underground, or perhaps they never were connected to surface life. Though bacteria has a way of swapping genes, and some gene evolutions lead to by products that have nothing to do with their main advantage, which makes it all more murky.
Tom Hendricks
http://www.daviddarling.info/encyclopedia/U/UV_origin_of_life.html (UV paper) |
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Tom Hendricks
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| Posted: Fri Oct 10, 2008 4:57 pm Post subject: Re: What about life under the see and UV |
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On Oct 6, 6:15=A0pm, Tom Hendricks <tom-hendri...@att.net> wrote:
[quote]We are now finding life not at the bottom of the sea, but way underneath =
the sea. It may be a sizable percentage of all life.
I ask the SBE group this question. Does anyone know if the genomes of the=
se undersea bacteria, have UV repair mechanisms.
I ask that to see if they are land life that has gone underground, or per=
haps they never were connected to surface life. Though bacteria has a way o=[/quote]
f swapping genes, and some gene evolutions lead to by products that have no=
thing to do with their main advantage, which makes it all more murky.
[quote]
Tom Hendrickshttp://www.daviddarling.info/encyclopedia/U/UV_origin_of_lif=
e.html(UV paper)[/quote]
Friend sent me this about undersea life that virtually lives
completely and solely by itself.
http://www.eurekalert.org/pub_releases/2008-10/dbnl-btj100708.php |
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Lorentz
Guest
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| Posted: Fri Oct 10, 2008 4:57 pm Post subject: Re: What about life under the see and UV |
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On Oct 6, 7:15=A0pm, Tom Hendricks <tom-hendri...@att.net> wrote:
[quote]We are now finding life not at the bottom of the sea, but way underneath =
the sea. It may be a sizable percentage of all life.
I ask the SBE group this question. Does anyone know if the genomes of the=
se undersea bacteria, have UV repair mechanisms.
I don>t think any bacterium repairs UV photons |:-) Seriously, you[/quote]
asked a leading question. I>ll answer you anyway to show what is
wrong.
The answer to your literal question is definitely "no." If an
organism lives deep under the sea, ultraviolet light can>t penetrate
to where it lives. Therefore, there is no way the organism can even
experience UV damage. So no repair mechanism, no matter how similar it
was to the ones used by our skin cells, could possibly repair damage
done by UV radiation. This would be true even for the first organism
that lived deep undersea. So the question is totally irrelevant to the
origin of life.
To put it another way:
I am pretty sure that deep sea organisms need a DNA repair
mechanism. There are all sorts of things that damage DNA other than UV
radiation. For one thing, deep sea organisms live in a very hot,
highly acidic environment. For sure this type of environment would
damage DNA. Therefore, the organism would greatly increase its chances
of survival by developing a DNA repair mechanism. Some enzyme and some
protocol is necessary to repair the DNA. However, there is no way a
priori this enzyme could know that the DNA was damaged by acid rather
than UV photons. So if this organism was tossed by some storm to the
surface, the same enzyme could be used to repair the DNA damaged by UV
photons. Therefore, finding a DNA repair mechanism is not the same as
finding a "UV repair mechanism." Almost any repair mechanism can also
be a "UV repair mechanism."
So another answer to your question is " definitelyyes"! Bacteria
on the bottom of the sea have ways to correct the DNA in their bodies.
Even lateral gene transfer can be considered a way to repair DNA,
because by absorbing a dominant gene it can suppress the expression of
a recessive gene that resulted from DNA damage. Any repair mechanism,
any at all, can be called a "UV repair mechanism." Even if its only
use is to repair the damage caused by hot acid environments.
To make your question meaningful, you have to specify how a "UV
repair mechanism" would chemically differ from any genome repair
mechanism. Anywhere you find DNA, you will find DNA damage. Anywhere
you find genomes, you will find processes that damage the genome.
Anywhere organisms present damaged genomes or damaged DNA, one will
find genome repair mechanisms.
Before I go farther in answering your question, you have to answer
another two questions for me:
1) On what specific time and date did you stop beating your wife?
2) When did I stop beating my boyfriend? |
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