Sleep Fragmentation in TcMAC21 Mouse Model of Down Syndrome.
Jacob Tusk1, Marina Antonia Salinas Canas1, Tarik F Haydar1,2
1Center for Neuroscience Research, Children's National Hospital, Washington, DC, 20010, USA.
Nature and Science of Sleep
|October 27, 2025
Summary
Transchromosomic TcMAC21 mice exhibit fragmented sleep and reduced sleep duration, mirroring sleep disturbances seen in Down syndrome (DS). This mouse model offers new insights into the mechanisms of sleep dysfunction in DS.
Area of Science:
- Genetics
- Neuroscience
- Sleep Medicine
Background:
- Down syndrome (DS) is the most common chromosomal disorder, with a high prevalence of sleep disturbances.
- Mouse models are crucial for understanding the complex genetic mechanisms underlying DS-related sleep issues.
- The TcMAC21 mouse model closely mimics human DS genetics but its sleep architecture was previously unstudied.
Purpose of the Study:
- To investigate the sleep-wake architecture of the TcMAC21 mouse model.
- To determine if TcMAC21 mice display sleep fragmentation and disruption similar to individuals with Down syndrome.
Main Methods:
- Utilized a non-invasive piezo-electric sleep recording system in male TcMAC21 (TS) and euploid (EU) mice.
- Analyzed sleep-wake architecture under a 12-hour light/dark cycle.
- Key metrics included total sleep percentage, bout frequency, and bout length.
Main Results:
- TS mice showed significantly reduced sleep bout duration during the dark phase (-29.0%, p=0.02).
- A significant decrease in total sleep percentage was observed in TS mice during the dark phase (-24.2%, p=0.04).
- No significant changes in sleep architecture were noted during the light phase.
Conclusions:
- TcMAC21 mice exhibit significant sleep fragmentation during the dark phase, potentially modeling Down syndrome sleep disruption.
- Findings differ from other DS animal models, suggesting the TcMAC21 model offers unique insights.
- This model may elucidate the neurologic and anatomic underpinnings of sleep dysfunction in Down syndrome.
