ROFL. So your number was indeed made up, and you went scrambling for something else.
Thatâs not mutations, those are protein sequences with a particular enzymatic function, which generally arenât thought to arise de novo particularly often in evolution, but rather evolve incrementally from related ligand-binding proteins. Which is why they write:
Our estimate of the low frequency of protein catalysts in sequence space indicates that it will not be possible to isolate enzymes from unbiased random libraries in a single step. The required library sizes far exceed what is currently accessible by experiment, even with in vitro methods (31, 35). Instead, as in natural evolution, the design of new enzymes will require incremental strategies in which, for instance, a suitable scaffold is first generated, binding and catalytic groups are subsequently added, and the ensemble is optimized in an iterative fashion.
But hey, thatâs a functional enzyme sequence 53 orders of magnitude more frequent that what ID-creationists think Axeâs experiments have shown.
A shark fin and a whale flipper have essentially the same specific function but very different anatomyâs. They are examples of convergent evolution, but that tells us nothing about any comparative probabilities, which, given the aqueous environment, are virtually certain.
OMG⌠this figure is only regarding ONE specific function (AroQ mutases), not ANY specific function.
There is also this bit in the article that you sited:
The size of such a library is many orders of magnitude larger than that needed to identify noncatalytic ATP-binding proteins from random sequences (31).
Functional primordial proteins presumably originated from random sequences, but it is not known how frequently functional, or even folded, proteins occur in collections of random sequences. Here we have used in vitro selection of messenger RNA displayed proteins, in which each protein is covalently linked through its carboxy terminus to the 3Ⲡend of its encoding mRNA1, to sample a large number of distinct random sequences. Starting from a library of 6 à 10^12 proteins each containing 80 contiguous random amino acids, we selected functional proteins by enriching for those that bind to ATP. This selection yielded four new ATP-binding proteins that appear to be unrelated to each other or to anything found in the current databases of biological proteins. The frequency of occurrence of functional proteins in random-sequence libraries appears to be similar to that observed for equivalent RNA libraries2,3.
It is indeed fallacious reasoning to say: âit looks designed to me, therefore it is designedâ
âŚsince itâs appealing to subjective intuition.
Here you come along and say: âI can look at these watches. They look designed to me. We also know they are designed, so âlooks designed to meâ is an accurate inference.â
This also is faulty reasoning. Just because fallacious reasoning CAN lead to a correct conclusion, that doesnât mean it isnât fallacious reasoning. Itâs just that you can come to a correct conclusion IN SPITE of the fact that the reasoning you used was fallacious. This is rather like an âinverse fallacy fallacyâ.
The actual reason why we know these watches are designed is not because they âlook designedâ. Rather, it is because we are already aware of where they come from.
To hammer down the point of why âlooks designed to meâ is fallacious reasoning; instead of looking at watches, letâs apply it to this example below:
This âlooksâ designed, doesnât it? This structure is even called the âGiantâs causewayâ since celtic legends say this was build by actual giants. Well, is it designed?
assuming that the âspecificâ pair of converging organisms is the only pair that could have potentially converged. Evolution is contingent, and with a slightly different set of circumstances, we could have had a flying cousin of the Rodents, rather than the bat we know, that is a flying cousin of Carnivores and Ungulates, as the mammalian clade that converged on flight along with birds.
assuming that (for example) the âspecificâ series of mutations that historically caused the ancestors of the bat to gain flight are the only series of mutations that could possibly have done this. Just as thereâs âmore than one way to skin a catâ, it seems reasonable that thereâs âmore than one way to wing a batâ.
Is it me or is 1 in 1030 become the new 42 â the ultimate answer to Life, the Universe and Everything â i.e. the answer to all questions?
As we are talking about specifics, what is 1 in 1030 the specific probability of? What specific evidence is it based on? And what specific argument derives this number from this evidence?
Here is one that I think you should remember. You should also remember this discussion is about bacteria where this is the most likely possibility of seeing a protein sequence evolve in a population.
As you know it depends on the protein. Some vertebrate proteins may be orders of magnitude more difficult then what Axe has quoted. Proteins in the WNT beta catenin pathway are likely more challenging then beta lactamase.
Evolution is a limited explanation unless it can account for the worst case.
Back to making stuff up again you have no idea whether is true, and in any case evolution doesnât have to invent a particular function de novo, as they can evolve incrementally by combining parts of other proteins and so on.
âŚan average of 51.5 de novo genes per million years
Unless you think that every single species (including the domesticated rice species) within that genus were all uniquely created, then this would suffice.
I really have no idea. Itâs difficult to relate the idea of a function to the frequency by which a mutation would result in it. How does that work exactly?
In any case letâs play with that number. It is estimated a cubic meter of sea water contains approximately 1012 bacteria. The total volume of Earthâs oceans comes out at 1.335x1021 liters. Assume the typical bacterium divides once every 4 hours, and have been doing so for 4 billion years, and assume an average rate of mutation of 1 in 1000 cell divisions, I get ~8.76x1042 total mutations in the history of life on Earth.
That means that function that only occurs once in every 1030 mutations could have occurred ~8.76x1042/1030 = 8.72 trillion times.
true. but i will argue that its not that different. if we know that specific function is so rare in sequence space, then we can conclude that we do need a huge number of mutations in order to get a specific function twice by convergent evolution. now, since many biological systems needs at least few proteins, we can conclude that the chance to get a specific biological system twice (or even the same function with different structure) should be extremely small.
see above.
this refer to a different protein/function which can bind an ATP. which is very different from AroQ mutases. actually, its not even a functional protein, since there is no protein that only bind ATP. ATP binding by itself do nothing in the cell. so if we are talking about a protein that needs 3 binding sites (such as the aminoacyl-tRNA synthetase) we are talking here about one in 10^36 mutations to get that protein.
which is again also true for gears and motors.
not necessarily. Itâs just a simple structure in relation to say a watch.
i dont think so. if gears exist in nature, and we know that human didnt made nature- we can conclude that other designer was involve.
Hi Ness
I do think that plants maybe able to generate some de novo genes through recombination resulting in some exon changes based on Turf study. I have seen this and other examples. I have not seen anything like this for vertebrates. Have you?
The development of blood antifreeze opened a new niche for these fish, and that in turn altered the landscape of selection on other features. Sean Carroll is featured in this YouTube: