Transcription and RNA Processing

ID #2402

So is removal of introns/RNA splicing done completely after the entire process of transcription or is it considered like the end part of transcription? I know it's branded as post-transcriptionally but doesn't splicing technically start after the primary transcript is conceived meaning transcription technically isn't over yet?


Removal of the introns happens concurrently with transcription. It's post-transcriptional in that you can't splice something that hasn't been transcribed yet. 
The snRNPs do not wait until the entire mRNA is finished to start splicing. Instead, as soon as the RNA polymerase has made enough of the transcript for the snRNPs to recognize the intron, they begin splicing it out. 
So yes, the splicing will take place while transcription is still going on. 

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