On Sat, 19 Aug 2023 08:31:38 -0500, the following appeared
in talk.origins, posted by RonO <
rokimoto@cox.net>:
https://www.cell.com/action/showPdf?pii=S2211-1247%2823%2900966-X
https://news.mit.edu/2023/study-explains-how-part-nucleolus-evolved-scaffold-0815
The nucleolus is an organelle where most of the ribosomal RNA is
produced inside the eukaryotic nucleus. Long after the Cambrian
explosion terrestrial vertebrates evolved a novel structure in the
nucleolus. Amniotes have a third compartment added to the nucleolus.
These researchers found that one gene seems to be responsible for the >creation of this third compartment.
What is interesting is that if they put the TCOF1 gene into fish they
can develop an additional compartment in their nucleolus and go from 2 >compartments to 3. It looks like the addition of this gene was able to >utilize what already existed to form the third compartment that amniotes >evolved. Single gene evolution resulting in the production of a novel >complex structure.
Interesting article (what I understood of it); thanks.
Sounds like they're still working out the details, including
the utility of the third section.
--
Bob C.
"The most exciting phrase to hear in science,
the one that heralds new discoveries, is not
'Eureka!' but 'That's funny...'"
- Isaac Asimov
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