Asking Darrel Falk to Pick a Number, Any Number
I have long questioned the assumption that most genomic DNA sequences are “nonsensical” or “junk.” And given the data that have emerged over the past seven or so years, a functionalist view of genome has robust empirical support. It is for this reason that I think many of the arguments presented by the Biologos Foundation are “wrong on many counts,” to borrow a phrase from Darrel Falk.
Here is an example. While reading the “critique” of Steve Meyer’s book, Signature in the Cell, by Francisco Ayala, a number struck me that I know to be incorrect. The integer that I am referring to is “25,000” and it is claimed to be the known tally of genes in our chromosomes:
The human genome includes about twenty-five thousand genes and lots of other (mostly short) switch sequences…
Now, the problem with such a statement is this: While there are ~25,000 protein-coding genes in our DNA, the number of RNA-coding genes is predicted to be much higher, >450,000.1 Some of the latter range in length from being quite short–only 20 or so genetic letters–to being millions of letters long. Since 2004 we have learned that over 90% of our DNA is transcribed into RNA sequences at some developmental stage, in different cell and tissue types.2, 3, 4 (Our brain cells are unusually rich in these non-translated RNAs.) These RNAs are then processed into regulatory and structural sequences of all sizes.2, 3, 4
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