Distinction Between Functional RNA (fRNA) and NcRNA
Several publications have started using the term functional RNA (fRNA), as opposed to ncRNA, to describe regions functional at the RNA level that may or may not be stand-alone RNA transcripts. Therefore, every ncRNA is a fRNA, but there exist fRNA (such as riboswitches, SECIS elements, and other cis-regulatory regions) that are not ncRNA. Yet the term fRNA could also include mRNA as this is RNA coding for protein and hence is functional. Additionally artificially evolved RNAs also fall under the fRNA umbrella term. Some publications state that the terms ncRNA and fRNA are nearly synonymous.
Read more about this topic: Non-coding RNA
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