Comparative profiling of white matter development in the human and mouse brain reveals volumetric deficits and delayed myelination in Angelman syndrome.
Siddhi S Ozarkar, Ridthi K-R Patel, Tasmai Vulli and 9 others
PMID 39726042WHAT IT FOUND
Children with Angelman syndrome have significantly smaller brain volumes from age 1, with white matter reduced by 26.5% between ages 6 and 12.
Mouse models show this is driven by a delay in myelination onset that normalizes later, suggesting a window for early intervention.
Key findings
01White matter volume is decreased by 26.5% and gray matter by 21.6% in children with Angelman syndrome compared to controls between ages 6 and 12.
02In mouse models, myelination onset is delayed but normalizes by adulthood, with no permanent defect in the myelination process itself.
03The delay in myelination in mice is associated with the absence of UBE3A in neurons rather than oligodendrocytes.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study cannot directly measure myelination in humans; the link to the mouse data is inferential. Translating mouse developmental timelines to humans is difficult, as a delay of days in mice may correspond to months or years in humans. The mouse model used (Ube3a knockout) does not fully replicate the larger chromosomal deletions seen in most human AS cases. The study focused on children and mice; adult human data was not included to assess long-term persistence of deficits.
Declared interests
The authors declared no conflicts of interest. The work was supported by NIH and the Simons Foundation.
The easy way to misread this
Do not assume the white matter deficits seen in children are permanent or structurally abnormal. The mouse data suggests a delay in myelination onset that eventually normalizes, implying that the timing of intervention may be more critical than the structural integrity of the myelin itself.