Transcription and RNA Processing

ID #1174

Are the introns being spliced made up of DNA or RNA? i know that they are initially regions of DNA which do not code for RNA..but what happens after transcription?

The introns are in the genes themselves, so they're part of the DNA, but since RNA polymerase II doesn't "know" intron DNA from exon DNA, the introns are part of the transcript (RNA). They DO code for RNA, they just don't have information in them that will wind up being used to make part of a protein. After transcription, they are spliced out in a spliceosome by snRNPs.

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