Mutagenesis Screen for Prepulse Inhibition Regulators
Objective: Perform an unbiased genetic screen to isolate mutant zebrafish lines with reduced prepulse inhibition (PPI) and identify genes regulating sensorimotor gating
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Equipment1
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Protocol Steps
Establish baseline acoustic startle response
Measure the acoustic startle response in zebrafish larvae to establish baseline sensorimotor gating parameters
Note: This establishes the normal response pattern against which mutants will be compared
View evidence from paper
“the acoustic startle response in zebrafish larvae is modulated by weak prepulses in a manner similar to mammalian PPI”
Perform mutagenesis screen
Conduct an unbiased genetic screen to isolate mutant lines with altered prepulse inhibition responses
Note: Screen is described as unbiased, designed to identify genes regulating sensorimotor gating
View evidence from paper
“we performed a screen and isolated mutant lines with reduced PPI”
Test prepulse inhibition in mutant lines
Measure prepulse inhibition responses in isolated mutant lines using weak prepulses before acoustic startle stimuli
Note: Mutants are identified by reduced PPI compared to wild-type controls
View evidence from paper
“isolated mutant lines with reduced PPI”
Characterize sensory acuity in mutants
Test sensory acuity of mutant lines to determine if reduced PPI is due to sensory deficits
Note: Used to distinguish between sensory and central processing defects
View evidence from paper
“they have normal sensory acuity and startle performance, but reduced PPI”
Assess startle performance in mutants
Measure baseline startle response performance in mutant lines to confirm normal motor function
Note: Confirms that reduced PPI is not due to impaired startle response capability
View evidence from paper
“they have normal sensory acuity and startle performance, but reduced PPI”
Test antipsychotic drug effects on PPI
Administer antipsychotic drugs to assess their ability to suppress dopamine agonist-induced PPI disruptions
Note: Validates that zebrafish PPI responds to pharmacological manipulation similar to mammals
View evidence from paper
“like in mammals, antipsychotic drugs can suppress disruptions in zebrafish PPI induced by dopamine agonists”
Test dopamine agonist effects on PPI
Administer dopamine agonists to induce PPI disruptions and test antipsychotic drug rescue
Note: Demonstrates pharmacological validity of the zebrafish PPI model
View evidence from paper
“antipsychotic drugs can suppress disruptions in zebrafish PPI induced by dopamine agonists”