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Updated: Jul 14, 2026
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Inchworming: A Novel Motor Stereotypy in the BTBR T+ Itpr3tf/J Mouse Model of Autism
Published on: July 5, 2014
Autism-like behavioral phenotypes in BTBR T+tf/J mice
H G McFarlane1, G K Kusek, M Yang
1Laboratory of Behavioral Neuroscience, Intramural Research Program, National Institute of Mental Health, Bethesda, MD 20892-3730, USA.
Genes, Brain, and Behavior
|June 15, 2007
Summary
The BTBR mouse strain exhibits autism-like behaviors, including social deficits and repetitive grooming. Genetic analysis revealed a specific Kmo gene polymorphism, offering a new model for autism research and treatment development.
Area of Science:
- Neuroscience
- Genetics
- Behavioral Science
Background:
- Autism Spectrum Disorder (ASD) is a complex neurodevelopmental disorder with unknown causes.
- Mouse models are crucial for understanding ASD etiology and testing potential treatments.
- The BTBR T+tf/J (BTBR) mouse strain shows promise as a model for ASD.
Purpose of the Study:
- To characterize the behavioral phenotypes of the BTBR mouse strain relevant to ASD.
- To investigate potential genetic underpinnings of these behaviors.
- To establish BTBR as a valuable research tool for autism.
Main Methods:
- Behavioral testing of BTBR mice, including social approach, social interaction, juvenile play, and self-grooming.
- Assessment of social recognition, olfaction, anxiety, and motor function.
- Database comparison of candidate autism genes between BTBR and C57BL/6J (B6) strains.
- Genetic sequencing of the Kmo gene.
Main Results:
- BTBR mice displayed significant social deficits, including reduced social approach and impaired juvenile play.
- Repetitive self-grooming was observed in BTBR mice.
- Social recognition, olfaction, anxiety, and motor functions were normal in BTBR.
- A specific single nucleotide polymorphism (SNP) in the Kmo gene was identified in BTBR mice.
- The Kmo gene encodes kynurenine 3-hydroxylase, involved in neuroactive metabolite regulation.
Conclusions:
- The BTBR mouse strain presents a robust and selective model for studying core autism symptoms.
- The identified Kmo gene polymorphism warrants further investigation for its role in autism-related behaviors.
- BTBR mice offer a valuable platform for exploring autism etiology and therapeutic interventions.
