Signalling Pathway: Which pathway is correct?

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SUMMARY

The correct signaling pathway in the discussion is identified as Option 2, based on the observation that Let1 is essential for activating Let2. If Let1 is knocked out, the expression of X ceases, confirming that Let2's over-expression disrupts normal regulatory controls. The conclusion drawn is that the final stage of the pathway involves Let2 activating X, aligning with the characteristics of Option 2.

PREREQUISITES
  • Understanding of signaling pathways in molecular biology
  • Knowledge of gene expression regulation
  • Familiarity with the roles of Let1 and Let2 in cellular processes
  • Ability to interpret experimental observations in the context of genetic pathways
NEXT STEPS
  • Research the role of Let1 in activating downstream signaling molecules
  • Study the mechanisms of gene expression regulation in signaling pathways
  • Explore the implications of over-expression in cellular signaling
  • Investigate alternative pathways that may be influenced by Let1 and Let2
USEFUL FOR

This discussion is beneficial for molecular biologists, geneticists, and researchers focused on cellular signaling mechanisms and gene regulation. It provides insights into the complexities of pathway interactions and the consequences of gene knockout experiments.

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Homework Statement
In an organism, expression of gene ‘X’ is induced in the presence of a hormone. Genetic analysis showed that the hormonal signal is transduced through two proteins Let1 and Let2. The expression of gene ‘X’ was studied in lines over-expressing (OE) the active Let proteins, knock out (KO) of the Let proteins or combination of both.
Relevant Equations
Results of expression of gene ‘X’ in the presence of the hormone is summarized below:
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Based on the above, which one of the following pathways best fits the observation made?

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Correct ans is 2.
pg-315, sum-56

Attempt:

I think all the options are wrong, and the pathway should be
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Option 2 is incorrect because if Let 1 is knocked out, the expression of X will stop as Let1 is needed to activate Let2.
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Am I right?
 
Last edited:
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Let2 "over-expression" mean the normal (WT) expression controls of Let2 are broken, and Let2 is expressed regardless of control signals. Therefore, last stage of pathway is "Let2 activates X", to which only answer (2) is matching.
 
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