Crazy Rabbit

Over at his blog, Steve Matheson has an interesting response to my essays on introns and design.  It’s a good read, so you should check it out.  I’ll ask da bunny what he thinks and get his reply up sometime this week.

Silly Rabbit!  Introns are for Ducks!

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6 responses to “Crazy Rabbit

  1. My first impression, regarding the relative “success” of metazoans, it is true that metazoans opened up new ecological niches as a result of the evolution of multicellularity. And this is important. The choanoflagellates themselves have remained much more restricted in their ecological range , they are all bacteriovores and mostly sessile. They also appear to have colonized freshwater once during evolution, whereas metazoa have done so many times.

  2. Regarding Arthur Hunt’s comment,(regarding introns in Chlamy and higher plants) not sure how relevant it is, haven’t finished digesting this all. But I would say they are not the same exactly. The plant ones might be bigger in some lineages, I seem to recall it is pretty variable, but a lot of the positions are conserved (this is actually surprising if true).

    Other green algae are different however, like the tiny genomes of Ostreococcus. I am
    not sure what they are like exactly (not like nucleomorph ones anyway). I will add more comments this week.

  3. Anyway, very much enjoying your series here, keep it up Mr Rabbit :)

  4. Wow- they are trying to let you have it over there Mike.

    They are in full attack mode.

    However they do not seem to be able to find positive evidence that demonstrates introns and exons, editing and splicing, can “evolve” via an accumulation of genetic accidents.

    Introns and exons make sense in a design scenario only.

    Althernative (gene) splicing only makes sense in a design scenario.

    But hey let’s see if they can actually support their position or will they just attack me too?

  5. Some more specific info on Chlamydomonas. Over 85% of it’s protein coding genes have introns. Their average length is larger than those in angiosperms. The average number of intron per gene is larger than that of Physcomitrella and Arabidopsis. However, it is comparable to that of humans. IMO, this is unsuprising given that many other key factors important in the evolution of multicelluarity are also found in Chlamy. (see here )

  6. Hi Guts,

    Good the hear from ya again. That Chlamydomonas contain so many introns does not in anyway argue against my hypothesis once you consider that green algae are closely related to vascular plants and plants are also complex, multicellular organisms (see the cell type numbers in my post, “Where are the prokaryotic mice?”).. In other words, it is effectively analogous to the situation with choanoflagellates and metazoa.

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