DNA and identifications
rcourtec at PHARE.UNIV-LILLE2.FR
Sat Jan 16 12:08:53 CST 1999
The necessity of having a complete set of DNA sequences for compariso=
of course one important problem (far from being solved as Thomas suggests=
But the accuracy of the identifications made to create this DNA seque=
database is another crucial point. For such a purpose, taxonomists (in th=
traditionnal meaning) are definitely necessary to make the job. (Who els=
I know actual cases where DNA-based identification came to a wrong
conclusion because the reference material was erroneously determined by a
non-specialist. Of course, molecularists are unable to judge the accuracy=
taxonomical identification and are quite confident in their molecular met=
What they find while comparing the DNA of an unknown specimen with the
reference data set MUST be the correct name. The problem is that we still=
a preliminary correct identification to make the method simply credible.
The present balance between the number of reliable taxonomists and th=
legions of molecularists make me very pessimistic about the very future o=
molecular biology. When taxonomists will become extinct (if the tendency =
runs to this misfortunate issue), molecularists will really feel alone...
"Thomas G. Lammers" wrote:
> At 11:28 AM 01-15-99 CST, you wrote:
> >To the gene jocks out there,
> >Question that came up recently and is beyond my
> >expertise... if you had a piece of plant could you
> >identify it to species just by DNA-type analyses?
> >The only information you would have is that the
> >piece was from a plant but you had nothing further, no
> >locality, no data on genus or family or even if gymnosperm
> >of angiosperm. (I am fully aware that once you know what
> >species you can identify the indivudual from whence the
> >piece came.) I was told there is a lab in Arizona that can
> >do this type of ground zero identification but haven't found
> >anything on the web. Anyone know about this lab?
> I'm no molecular johnny, but identification such as this would seem to=
> predicated on having known sequences to compare against. I would suspe=
> very tiny fraction of the world's species have been sequenced for any o=
> gene and the results communicated to GENBANK. Better results could be
> obtained much quicker and much more cheaply with a good herbarium speci=
> : - P
> Thomas G. Lammers
> Classification, Nomenclature, Phylogeny and Biogeography
> of the Campanulaceae, s. lat.
> Department of Botany
> Field Museum of Natural History
> Roosevelt Road at Lake Shore Drive
> Chicago, Illinois 60605-2496 USA
> e-mail: tlammers at fmnh.org
> office: 312-922-9410 ext. 317 (voice-mail)
> fax: 312-427-2530
> "The most important thing to learn is how
> to teach yourself. Everything else ...
> is just detail."
> -- Patrick Gibson
D=E9partement de Botanique
Facult=E9 des Sciences Pharmaceutiques et Biologiques
BP 83 ; F-59006 Lille Cedex
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