00:01
One person have the same dna, but there are over 200 different type of cell with different structure and functions.
00:10
This is what we call gene expression regulation.
00:23
So the idea of gene expression regulation is that although the dna genes are always there, not every single gene is being expressed the same way in the cell.
00:35
Let's give you an example.
00:37
Let's say you have kidney cell and then you have a skin cell.
00:48
Now they all start out with same kind of dna.
00:51
So i use two black bar or line to represent double -stranded dna.
00:58
So these dna obviously they have same kind of gene on it.
01:03
So let's say red represent the kidney gene and green represent skin gene.
01:16
So they are both present in the genomic dna.
01:21
But in kidney cell, only the kidney gene is being expressed.
01:32
So a specific transcription factor is available, which only binds to the upstream of the kidney gene.
01:42
So in this case, you'll have a specific transcription factor here, bind to the promoter region and transcribe the red one.
01:52
So as a result, you'll have the gene product, rna, and then you'll have protein, number one.
02:13
Now, because they're missing the specific transcription factor, the green gene, there's no expression.
02:28
So as a result, there's no gene product of rna2 and protein 2...
