Gait as a quantitative translational outcome measure in Angelman syndrome.
Stela P Petkova, Anna Adhikari, Elizabeth L Berg and 3 others
PMID 35274462WHAT IT FOUND
Angelman syndrome mice walked with wider stances and longer, slower steps than controls, patterns that appeared at weaning and worsened with age.
These gait metrics mirror human Angelman symptoms, suggesting a reliable way to track motor decline in future drug trials.
Key findings
01Angelman syndrome mice exhibited global motor deficits, traveling 25% less distance and moving at 80% of the velocity of wildtype mice in an open field.
02Adult Angelman mice showed abnormal gait with wider stance widths, 20% longer step lengths, and decreased stride frequency compared to controls.
03Gait abnormalities were detectable as early as weaning (postnatal day 22) and progressed throughout development, with stride time and step length continuing to worsen into adulthood.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
This is an animal study using mice, so findings cannot be directly applied to human patients without further clinical validation. The study did not test multiple treadmill speeds, so it is unclear if the observed gait patterns (like reduced double support) are a compensatory strategy for a fixed speed or a true deficit. The authors note that detailed temporal gait metrics have not been commonly reported in other neurodevelopmental disorder models, limiting comparison. The study focused on motor outcomes only; it did not assess communication, cognition, or social behaviors, so the link between gait and other domains remains theoretical.
Declared interests
Funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the National Institute of Neurological Disorders and Stroke, the Intellectual and Developmental Disabilities Research Center, and the Foundation for Angelman Syndrome Therapeutics.
The easy way to misread this
Do not interpret these gait findings as evidence that a specific therapy works. This study describes the natural progression of motor deficits in mice to establish baseline metrics for future trials; it did not test any treatment.