Posted: Apr 18, 2019 1:15 am
by Wortfish
Rumraket wrote:
None of which contradicts what I said.

IT DOES. The authors are referring to Stage C, and not Stage F, when they write the following:

"In short, the emergence of a functional AFGP polyprotein cds required only a single nucleotide change in the ancestral 9-nt GCA(Ala)-rich element for it to become the founder codons for one Thr-Ala-Ala tripeptide. Following this, microsatellitelike tandem duplications of the tripeptide cds unit would be required, but both processes could occur with relative ease."

They write later on the following:

Forming proper coding regions of the AFGP gene alone would not lead to a gene product unless a minimal promoter was acquired to activate transcription thereby functionalizing the gene..

In other words, the microsatellite-like repeats of the 3-codon element (Thr-Ala-Ala) preceded the gain on the promoter and the onset of transcriptional activity. And, yet, they still claim that these repeats happened under "selective pressure."

We hypothesize that, upon the onset of selective pressure from cold polar marine conditions, duplications of a 9-nt ancestral element in the midst of the four GCA-rich duplicates occurred.

That is clearly wrong.