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Q9:
Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?
Solution :
1. Theoretical Foundation of Reporter Enzymes
A reporter enzyme is a protein encoded by a reporter gene that produces a detectable phenotypic change—such as fluorescence, luminescence, or color variation—when expressed in a host cell. While selectable markers (e.g., antibiotic resistance genes like $amp^R$) are used to eliminate non-transformants, reporter genes serve to verify the expression profile, spatial localization, or success of the transformation process without necessarily killing the host cell population [Per Central Dogma of Molecular Biology].
2. Comparative Mechanism: Selectable Markers vs. Reporter Enzymes
| Feature | Selectable Marker | Reporter Enzyme |
|---|---|---|
| Primary Function | Survival-based selection (binary: dead/alive) | Phenotypic visualization (qualitative/quantitative) |
| Analytical Scope | Eliminates non-transformants | Monitors expression level/tissue specificity |
3. Step-by-Step Mechanism of Reporter Monitoring
The implementation of a reporter enzyme involves the fusion of the reporter gene to the target gene or promoter of interest. The process follows these logical steps:
- Step 1: Genetic Fusion: The reporter gene (e.g., $lacZ$ or $GFP$) is placed under the control of the same promoter as the foreign DNA or fused to the target protein sequence [By Recombinant DNA Technology principles].
- Step 2: Transformation: The engineered plasmid vector is introduced into the host cell (e.g., E. coli) via transformation, electroporation, or microinjection.
- Step 3: Expression: The host cell transcribes the mRNA and translates the reporter protein alongside the foreign DNA [Per Genetic Code universality].
- Step 4: Detection: The host is exposed to a specific substrate. For $lacZ$ ($\beta$-galactosidase), the addition of X-gal yields a blue color, allowing visual identification of successful transformation.
4. Visual Representation of Reporter Gene Expression (LacZ System)
5. Practical Applications and Justifications
The use of reporter enzymes is justified by several analytical advantages:
- Non-Destructive Assay: Unlike antibiotic selection which is lethal, reporter enzymes like Green Fluorescent Protein (GFP) allow for real-time, non-invasive monitoring of living cells under UV light.
- Quantification: The intensity of light or color produced is directly proportional to the promoter activity or protein expression levels [Per Beer-Lambert Law application in Biochemistry].
- Spatial Localization: Reporters help researchers determine where within the cell or organism the foreign DNA is expressing the protein.
Final Solution: A reporter enzyme monitors transformation by providing a visible, measurable phenotype (color, fluorescence, or light) linked to the successfully integrated foreign DNA. Unlike selectable markers, which only serve to isolate transformants via survival pressure, reporter enzymes allow for the dynamic quantification and spatial mapping of gene expression within the host cell population.
More Questions from Class 12 Biology Biotechnology: Principles and Processes EXERCISES
- Q1: Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
- Q1: Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet).
- Q2: Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.
- Q2: Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.
- Q3: From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?
- Q3: From what you have learnt, can you tell whether enzymes are bigger or DNA is bigger in molecular size? How did you know?
- Q4: What would be the molar concentration of human DNA in a human cell? Consult your teacher.
- Q4: What would be the molar concentration of human DNA in a human cell? Consult your teacher.
- Q5: Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q5: Do eukaryotic cells have restriction endonucleases? Justify your answer.
- Q6: Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?
- Q6: Besides better aeration and mixing properties, what other advantages do stirred tank bioreactors have over shake flasks?
- Q7: Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules.
- Q7: Collect 5 examples of palindromic DNA sequences by consulting your teacher. Better try to create a palindromic sequence by following base-pair rules.
- Q8: Can you recall meiosis and indicate at what stage a recombinant DNA is made?
- Q8: Can you recall meiosis and indicate at what stage a recombinant DNA is made?
- Q9: Can you think and answer how a reporter enzyme can be used to monitor transformation of host cells by foreign DNA in addition to a selectable marker?
- Q10(a): Describe briefly the following: (a) Origin of replication
- Q10(a): Describe briefly the following: (a) Origin of replication
- Q10(b): Describe briefly the following: (b) Bioreactors
- Q10(b): Describe briefly the following: (b) Bioreactors
- Q10(c): Describe briefly the following: (c) Downstream processing
- Q10(c): Describe briefly the following: (c) Downstream processing
- Q11(a): Explain briefly (a) PCR
- Q11(a): Explain briefly (a) PCR
- Q11(b): Explain briefly (b) Restriction enzymes and DNA
- Q11(b): Explain briefly (b) Restriction enzymes and DNA
- Q11(c): Explain briefly (c) Chitinase
- Q11(c): Explain briefly (c) Chitinase
- Q12(a): Discuss with your teacher and find out how to distinguish between (a) Plasmid DNA and Chromosomal DNA
- Q12(a): Discuss with your teacher and find out how to distinguish between (a) Plasmid DNA and Chromosomal DNA
- Q12(b): Discuss with your teacher and find out how to distinguish between (b) RNA and DNA
- Q12(b): Discuss with your teacher and find out how to distinguish between (b) RNA and DNA
- Q12(c): Discuss with your teacher and find out how to distinguish between (c) Exonuclease and Endonuclease
- Q12(c): Discuss with your teacher and find out how to distinguish between (c) Exonuclease and Endonuclease
CBSE Solutions for Class 12 Biology Biotechnology: Principles and Processes
Chapters in CBSE - Class 12 Biology
- Reproduction in Organisms
- Human Reproduction
- Reproductive Health
- Principles of Inheritance and Variation
- Molecular Basis of Inheritance
- Evolution
- Human Health and Disease
- Strategies for Enhancement in Food Production
- Microbes in Human Welfare
- Biotechnology and Its Applications
- Organisms and Populations
- Ecosystem
- Biodiversity and Conservation
- Environmental Issues
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