From the same paper:
“While the idea that mRNAs might have functions that are independent of their translation may be surprising, there are published precedents for related trans-acting functions of UTRs.”
Get it? They are finding that UTRs have functions that are INDEPENDENT of translation. Care to revise your categorical statement that DNA is ONLY used for protein producation?
There is gene transcription and regulation of gene transcription.
affinity for the Ribosome and localization to the proper Ribosomes.
mRNA stability.
Etc, etc.
You may notice (or in your ignorance perhaps you do not) that ALL of these functions have to do with protein production.
You still have not named a single DNA function not associated with protein production.
EPIC FAIL.