Is it possible that a reason for the large non-coding regions of the DNA are and evolutionary protection against mutations to the coding regions?
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It has been discovered that the non-coding DNA, formally thought of as junk DNA, is in fact not junk at all. Some of the non-coding DNA has been discovered to regulate the behavior of genes. There is still much to learn about DNA, and new information is being discovered all the time.

It has been reported that the sequences of this unknown DNA are inherited and that some repetitive patterns in it seem to be associated with increased risk for cancer. Also, the DNA has been found to mutate rapidly for example in response to cancer. It has been speculated that this DNA may contribute to the regulation of cellular processes.

What function all this non-coding DNA performs, as the regulatory activity observed thus far, is in just a tiny proportion of the total amount of non-coding DNA? Ultimately, significantly more evidence needs to be gathered.

In June 2004 a team at Harvard Medical School (HMS) reported, that they have, in a yeast, found a "Junk DNA" gene that regulates the activity of nearby genes. While common genes work by giving rise to proteins, this gene works by just being switched on. Then it blocks the activity of an adjacent gene.

So perhaps your answer would be yes...but???

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