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Re: Soft tissue: what can we expect to learn?
Fragments of DNA are not out of the question BTW. DNA directs protein
synthesis so at a minimum, some DNA structure may be inferred. Any
cellular structures preserved would be a bonus in the study. Since
none of us has seen the material, it would be impossible to speculate
on what can be learned. Many secondary cellular mechanisms of the
creature such as what amino acids (in affiliation with those proteins)
are present from the breakdown of those proteins. That being said.
There are common proteins produced by many mechanisms and there are
those more rarely expressed by unique metabolic processes. Based on
antibody reaction to protein presence, one can infer (based on what
occurs of course) what processes were involved in the production of the
particular protein. Metabolic pathways often produce specific
proteins. (I suspect that even most of these proteins will be
fragmentary as well.) Presence or absence of a particular molecule may
denote these processes and thusly an analogue can be made to modern
equivalent metabolic activity. Perhaps even rare exotic protein
occurrences may show even phylogenetic affinities and relationships.
Anything might come out of the study.
Regarding thermophysiological affinities, certainly a basis for such
conclusions could be reached if the proteins identified have modern
relationships to temperature regulatory mechanisms. Most reporters I
have met would have to ask how to spell thermophysiological let alone
make conjecture about it. Things we may not expect like thermally
regulatory related thyroid hormones such as thyroxine et al may be
present or even catacholamines which may shed light on thermo balance.
Sugars may be found as well which may shed light on many cellular
processes. How about some complete mitochondria just for good measure.
Heck, someone might be able to figure out the entire cellular
metabolism with the right preservation. I don't think anyone can
accurately speculate what WILL be found until the proteins (and other
metabolites) are identified specifically if at all. Remember your
biochemistry, it is not just proteins, there are lipids, esters,
anhydrides, sugars, enzymes and a host of others that could pop out of
the soup. A little molecular biology will go a long way here. Even
some old viruses, bacteria and fungi might reanimate.
A good cell biology team needs to be assembled to work the specimen and
perhaps more of the same creature should be sacrificed to acquire more
material. Most of the bones that I have collected from Hell Creek have
been penetrated by modern groundwater/roots/bacteria etc. It is sure a
On Mar 26, 2005, at 12:52 PM, Jura wrote:
Okay, so we know that DNA is out of the question, and
that protein, or protein fragments are our best bet.
With that in mind, what can we expect to learn from
I didn't hear the Don Lessem interview, so I don't
know what he mentioned, but I do see a lot of the news
reports saying that this could help identify the
thermophysiological affinities of _T.rex_. Is that
just typical, journalistic conjecture, or is there any
truth to this?
Offhand, I can't think of anything in a basic protein,
that would indicate one metabolic preference over the
other. The only thing that comes to mind, is finding a
protein with an analogue/homologue which has a very
narrow temperature tolerance. But given the efficiency
of active thermoregulation, combined with thermal
inertia, and the generally warm Mesozoic environment,
I can see, even that, going both ways.
Perhaps these proteins could hint at immunological
capacity, or digestive efficiency (though, given that
they came from a femur, I'm doubtful of the latter).
Anyway, I'm curious to see what other listmembers
think these proteins could shed light on. You know,
other than the fact that _T.rex_ had proteins. :)
"I am impressed by the fact that we know less about many modern
[reptile] types than we do of many fossil groups." - Alfred S. Romer
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