Re: Problems with fish to human evolution

From: r norman (rsn__at__comcast.net)
Date: 01/24/05 

Date: Mon, 24 Jan 2005 11:55:49 -0500 (EST)

On Sun, 23 Jan 2005 22:55:02 -0500 (EST), kwicher@yahoo.com
(Krzysztof) wrote:

>Hi.
>I don't usually deal with evolutionary problems, rather molecular
>biology, but recently I looked at the evolution of a protein I am
>interested in. Since several vertebrats genomes have been sequenced it
>became possible for me to check the presence of this protein in: fish
>(3 species), Xenopus, chicken, and mammals (10 species). What I found
>is that my protein is present in all mammals including opossum, and in
>all fish. However it is absent in chicken and in frog. Now, if one
>considers the evolutionary tree of vertebrates, sees that mammals
>have a common ancestor with reptiles (birds), amphibians and fish. So
>why I do not see the protein in chicken and fish? Ok, one can answer
>it has been lost in these two lineages. I accept that answer but when
>I look closer at the genomic neighbourhood of the gene (let say X) I
>see:
> in mammals: A - X - B - C
> in frog: A - C (gene B in completely different genomic
>localisation)
> in chicken: A - C (gene B in completely different genomic
>localisation)
> in fish A - X ... (genes B and C in completely different genomic
>localisation).
>
>Additionaly A and C in frog and chicken are so close to each other
>(few kb) that it is apparent that a deletion of X (assuming it has
>occured) must have happeaned before the emergence of these lineages.
>
>I am of course speculating now but is it possible that mammals evolved
>from fish without having common ancestors with modern amphibians,
>reptiles and birds?
>I know that all evolutionary books show a tree we are thought in
>schools but have you heard about some evolutionary problems that could
>support my hypothesis ?
>
>sorry for such a long post
>Thanks in advance
>Krzysztof

What is the protein and how are you searching?

Relevant Pages

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