00:01
Post transcriptional processing.
00:11
So this is a method or this is a process in which the mrna that is produced after transcription is modified or processed to form the mrna which can be used for translation.
00:35
So the pre -mrna is converted into functional mrna by the process of post -transcriptional processing.
00:55
Now this post -transcriptional processing only takes place in eukaryotic mrna.
01:05
Now this is because the eukaryotic mrna has sequences known as introns present in the mri.
01:16
Now these introns are actually non -coding sequences which do not code for any proteins and therefore they need to be removed from the mrna.
01:32
So the pre -mrna has several introns present in them and these introns need to be removed and this removal of introns is known as splicing.
01:44
So the first post -transcriptional processing that takes place is the splicing of introns where the introns from the pre -mrna is removed for the conversion of the pre -mrna into a functional mrna.
02:04
Now, entrons are absent in procarriers and therefore post -transcriptional processing does not take place in procarriots.
02:11
Now, what happens in splicing of entrons? so, if we consider this as the mrna and this as the exon, so the exon, so the exon is the region of the mrna which codes for a protein.
02:30
So it is the coding region of the mrna and this is the intron and then again we have an exon.
02:38
So the two exons are separated by the presence of an intron.
02:44
So by the splicing mechanism, now with the help of the splicing mechanism, that is the spliceo zones, then removes this introns or excises, this introns.
03:03
Endrons out of the mrna and then the exons are joined together.
03:10
So in this way the mrna is processed where all the endrons is removed from the mrn.
03:20
Now the other types of post -transcriptional processing that takes place is the 5 prime capping...