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A genetic screen for mouse mutations with defects in serotonin responsiveness.
Karin C Weiss1, Dennis Y Kim, Catherine T Pawson
1Samuel Lunenfeld Research Institute, Mt. Sinai Hospital, 600 University Avenue, Toronto, Ontario, Canada M5G 1X5.
Brain Research. Molecular Brain Research
|July 25, 2003
Summary
Researchers optimized a head twitch response (HTR) assay in mice to study serotonin system genes. They identified a mutation affecting serotonin responsiveness, potentially aiding research into depression and schizophrenia.
Area of Science:
- Neuroscience
- Genetics
- Pharmacology
Background:
- The serotonergic system is crucial for regulating behavior.
- Dysregulation of serotonin neurotransmission is linked to psychiatric disorders like schizophrenia and depression.
Purpose of the Study:
- To optimize a behavioral screen for identifying genes involved in serotonin responsiveness in mice.
- To conduct a genetic screen to uncover novel genes influencing serotonin signaling.
Main Methods:
- Developed and optimized a head twitch response (HTR) assay in C57Bl/6J mice.
- Administered serotonin agonists (DOI) to assess dose and age-dependent HTR.
- Performed a genetic screen using ethylnitrososurea (ENU) mutagenesis on 247 G1 mice.
Main Results:
- Established a quantifiable, dosage-dependent HTR assay influenced by the 5-HT2A receptor system.
- Identified distinct inbred mouse strains with varying HTR levels.
- Recovered one provisional heritable mutation exhibiting hyper-responsiveness to serotonin agonists.
Conclusions:
- The optimized HTR assay is effective for identifying genetic variations in serotonin responsiveness.
- The identified mutation offers a potential model for studying psychiatric disorders.
- This research may contribute to developing improved therapeutic strategies for depression and schizophrenia.