You are going to create a human activator (eA1) that...

You are going to create a human activator (eA1) that controls a set of genes responsible for academic success. You aim to create an activator that includes the components deemed essential through the study of other activators. What is the composition of your activator? In the process you also create two additional distinct activators (eA2, eA3). What experiments would you run to determine which activator works best? Suppose you wanted the activator to work in women students but not in men. How might you arrange that? What kind of activator would you have to design to make that work?

You are going to create a human activator (eA1) that controls a set of genes responsible for academic success. You aim to create an activator that includes the components deemed essential through the study of other activators.
What is the composition of your activator? In the process you also create two additional distinct activators (eA2, eA3). What experiments would you run to determine which activator works best? Suppose you wanted the activator to work in women students but not in men. How might you arrange that? What kind of activator would you have to design to make that work?

Key Concepts

Modular Design of Transcription Factors

Synthetic activators are typically built using modular components: a DNA-binding domain to target specific gene promoters, a transactivation domain to recruit the transcriptional machinery, and sometimes additional domains like a ligand-binding domain or nuclear localization signal. This modular approach allows flexibility in design, enabling the tailoring of activator properties to achieve specific gene expression profiles.

Comparative Functional Assays

Determining the best activator among multiple constructs requires systematic evaluation using functional assays. Reporter assays, such as luciferase or fluorescent reporters, allow quantification of transcriptional activation. These assays are performed in controlled experimental conditions, often with replicates and appropriate controls, to compare the potency and specificity of each activator construct.

Conditional Gene Regulation

To implement sex-specific gene activation, the activator can be designed to respond to certain physiological cues, such as hormones. Incorporating ligand-binding domains from hormone receptors (for example, estrogen receptors for women) allows the activator to function only in the presence of specific ligands. This strategy takes advantage of the hormonal differences between sexes to achieve targeted gene expression.

Experimental Design in Synthetic Biology

A rigorous experimental design is crucial when testing synthetic constructs. This includes creating multiple distinct activators, setting up proper controls, and employing quantitative measurements to assess performance. Techniques such as quantitative PCR, Western blotting, or chromatin immunoprecipitation can complement reporter assays to provide detailed insight into the activator's function and specificity.

Transcript

00:01 Hi everyone.

00:02 My name is eric and let's answer problem 11.

00:05 So in this problem, we are presented a figure that is showing us five different genes.

00:12 So there's gene one, two, three, four, and five.

00:18 Okay.

00:19 And these genes are shown on the right hand side of the figure.

00:25 Okay, so the genes are the regions of the dna that are going to code and correspond.

00:32 For our protein, whatever kind of protein that is going to be made.

00:37 And right before the genes, there is what is called a promoter region.

00:42 Now, the promoter region is where the promoter binds so that it can promote that polymerase binding to the dna sequence so that it can be transcribed.

00:53 And on the left -hand side, before the promoter region, what we find is we have enhancers.

01:01 So we have an enhancer region that corresponds to each different kind of gene.

01:12 Two, three, four, and five.

01:15 Okay.

01:16 So in each enhancer region, we have different corresponding colors.

01:22 Okay.

01:23 So the colors represent regions where activator proteins can bind.

01:29 And when activator proteins bind to the enhancer, when we have all the enhancers, it will help promote and activate the gene.

01:38 So that means that it will promote the polymerase to bind, and our gene will be turned on and transcribed.

01:45 So the way it works is that we must have all the colors activated with activators to actually turn on the gene.

01:56 Okay? and when i mean turn on the gene, that means so that the gene can be transcribed into a protein.

02:02 So the first question is part a, and it's asking us to draw an x above all the enhancer elements for activators that would bind to only gene 5.

02:15 So in gene 5, we have three different colors.

02:20 Okay.

02:20 So it would be the purple, the blue, and the red.

02:25 So in purple, blue, and red, looking through all of the figures, and for each gene, we're going to be the purple, we're going to be...

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