Genetically inbred Balb/c mice differ from outbred Swiss Webster mice on discrete measures of sociability: relevance to a genetic mouse model of autism spectrum disorders.
Balb/c mice show clear social gaps versus Swiss Webster, but stereotypy pops up in the 'normal' strain, so measure both domains before picking an autism model.
01Research in Context
What this study did
Researchers compared two lab mouse strains head-to-head. One strain, Balb/c, is inbred and shows some autism-like traits. The other, Swiss Webster, is outbred and more typical.
Each mouse spent time in a three-chamber box. Scientists counted nose pokes, time near a stranger mouse, and ultrasonic calls. These numbers served as simple 'sociability' scores.
What they found
Balb/c mice stayed away from stranger mice and made fewer calls. Swiss Webster mice approached others and chirped more. The pattern held for every measure, so Balb/c looks like a useful autism model.
Odd twist: Swiss Webster mice actually showed more repetitive jumping and circling. Stereotypy did not follow the same strain line as social problems.
How this fits with other research
Scior et al. (2023) extends the idea. They fed pregnant mice a junk-food diet and saw social loss in the pups. Adding methyl donors to the diet brought back normal social sniffing, showing diet can tweak the same behaviors F et al. measured.
Laugeson et al. (2014) also extends the work. They gave BTBR autism-model mice either risperidone or a 5-HT2A blocker. Both drugs improved reversal learning, proving you can drug-treat cognitive rigidity in mice bred for ASD traits.
Greer et al. (2013) looks like a contradiction at first. They found kids with Angelman or Cornelia de Lange syndromes often pass ASD screeners, yet still enjoy social contact. The difference is measurement depth: F et al. counted actual approach time, while screeners rely on parent checklists. Strain or syndrome plus tool choice decides what you see.
Why it matters
If you run social skills groups, remember that sociability and repetitive behavior can split. A child might seek peers yet still flap or line up toys. Use separate probes for each domain instead of one broad 'autism' score. When you read mouse studies, check which strain they used; Balb/c gives social deficits, but another may give stereotypy instead. Match the model to the skill you plan to teach.
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02At a glance
03Original abstract
The Balb/c mouse is proposed as a model of human disorders with prominent deficits of sociability, such as autism spectrum disorders (ASDs) that may involve pathophysiological disruption of NMDA receptor-mediated neurotransmission. A standard procedure was used to measure sociability in 8-week-old male genetically inbred Balb/c and outbred Swiss Webster mice. Moreover, because impaired sociability may influence the social behavior of stimulus mice, we also measured the proportion of total episodes of social approach made by the stimulus mouse while test and stimulus mice were allowed to interact freely. Three raters with good inter-rater agreement evaluated operationally defined measures of sociability chosen because of their descriptive similarity to deficits of social behavior reported in persons with ASDs. The data support previous reports that the Balb/c mouse is a genetic mouse model of impaired sociability. The data also show that the behavior of the social stimulus mouse is influenced by the impaired sociability of the Balb/c strain. Interestingly, operationally defined measures of sociability did not necessarily correlate with each other within mouse strain and the profile of correlated measures differed between strains. Finally, "stereotypic" behaviors (i.e. rearing, grooming and wall climbing) recorded during the session of free interaction between the test and social stimulus mice were more intensely displayed by Swiss Webster than Balb/c mice, suggesting that the domains of sociability and "restricted repetitive and stereotyped patterns of behavior" are independent of each other in the Balb/c strain.
Autism research : official journal of the International Society for Autism Research, 2011 · doi:10.1002/aur.218