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Convergence and Gaia

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  • Mike Doran
    Diversity and evolution of mitochondrial RNA editing systems. Gray MW. Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova
    Message 1 of 1 , Oct 11, 2003
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      Diversity and evolution of mitochondrial RNA editing systems.
      Gray MW.
      Department of Biochemistry and Molecular Biology, Dalhousie
      University, Halifax, Nova Scotia, B3H 1X5, Canada. M.W.Gray@...

      'RNA editing' describes the programmed alteration of the nucleotide
      sequence of an RNA species, relative to the sequence of the encoding
      DNA. The phenomenon encompasses two generic patterns of nucleotide
      change, 'insertion/deletion' and 'substitution', defined on the basis
      of whether the sequence of the edited RNA is colinear with the DNA
      sequence that encodes it. RNA editing is mediated by a variety of
      pathways that are mechanistically and evolutionarily unrelated.
      Messenger, ribosomal, transfer and viral RNAs all undergo editing in
      different systems, but well-documented cases of this phenomenon have
      so far been described only in eukaryotes, and most often in
      mitochondria. Editing of mRNA changes the identity of encoded amino
      acids and may create translation initiation and termination codons.
      The existence of RNA editing violates one of the long-accepted tenets
      of genetic information flow, namely, that the amino acid sequence of
      a protein can be directly predicted from the corresponding gene
      sequence. Particular RNA editing systems display a narrow
      phylogenetic distribution, which argues that such systems are derived
      within specific eukaryotic lineages, rather than representing traits
      that ultimately trace to a common ancestor of eukaryotes, or even
      further back in evolution. The derived nature of RNA editing raises
      intriguing questions about how and why RNA editing systems arise, and
      how they become fixed as additional, essential steps in genetic
      information transfer.


      Intelligent design creationists claim this kind of paper provides
      strong arguments for them.

      They claim that the article properly describes `RNA editing' as a
      programmed alteration presents a problem that such code can not
      evolve through small, incremental steps.

      They claim that the authors note that "particular RNA editing systems
      display a narrow phylogenetic distribution, which argues that such
      systems are derived within specific eukaryotic lineages, rather than
      representing traits that ultimately trace to a common ancestor of
      eukaryotes, or even further back in evolution." since they can't find
      a common ancestry thread so they have to rely on the independent
      evolution of these complex RNA editing systems, which is is called
      convergence, something that is prevalent in nature and by its very
      definition is anti-evolutionary.
      because it is used to describe traits that cannot be attributed to
      common decent. Intelligent designers argue that convergence is yet
      another signature God has left in his creation to thwart attempts to
      explain things via naturalistic processes.

      However, this article supports a living earth, which is pre cellular.
      In short, nucleotides in cirrus are sorted by electro mechanical
      movements between conductive ionosphere and cloud tops. The charge of
      the nucleotide allows cirrus to be ordered in bands in the
      atmosphere, just like electrophoresis bands the nucleotides. The
      banding then provides a biological feedback of temperature and rain
      back down on a earth, and the nucleotides rain, sorted by electrical
      and genetic conditio INDEPENDANT OF FUNCTIONING. This sorting was the
      start of life, and was precellular and would have caused an
      assortment of like ion behaving sequences. These sequences then
      converged as they became more efficient at various replicating
      processes, or became FUNCTIONAL. To make an arguement that this
      process supports some means that is not naturalistic is absurd and
      supported by no evidence or science or theory.
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