Brain white matter abnormalities associated with copy number variants

Nitzan Vigdorovich, Liat Ben-Sira, Lubov Blumkin, Ronit Precel, Ifat Nezer, Keren Yosovich, Zachary Cross, Adeline Vanderver, Dorit Lev, Tally Lerman-Sagie, Ayelet Zerem*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

White matter (WM) signal abnormalities are demonstrated in various neurodevelopmental disorders on brain magnetic resonance imaging (MRI). The pattern of WM abnormalities can aid in the diagnostic process. This study aims to characterize the WM changes found in microdeletion/microduplication syndromes. Thirteen patients with neurodevelopmental disorders due to copy number variations were collected from a cohort of children with evidence of WM abnormalities on brain MRI, in two medical centers. A pediatric neuroradiologist blindly interpreted the MRI scans. Clinical and genetic findings were retrospectively extracted from the medical records. WM changes included: multifocal (10/13) periventricular (12/13) and subcortical (5/13) signal abnormalities and WM volume loss (6/13). Dysgenesis of the corpus callosum was depicted in 12/13. The main clinical features were: global developmental delay (13/13), hypotonia (11/13), epilepsy (10/13), dysmorphic features (9/13), microcephaly (6/13), short stature (6/13), and systemic involvement (6/13). We showed that different chromosomal micro-rearrangement syndromes share similar MRI patterns of nonspecific multifocal predominantly periventricular WM changes associated with corpus callosum dysgenesis with or without WM and gray matter loss. Hence, the association of these features in a patient evaluated for global developmental delay/intellectual disability suggests a chromosomal micro-rearrangement syndrome, and a chromosomal microarray analysis should be performed.

Original languageEnglish
Pages (from-to)93-103
Number of pages11
JournalAmerican Journal of Medical Genetics, Part A
Volume182
Issue number1
DOIs
StatePublished - 1 Jan 2020

Funding

FundersFunder number
Jacob Kamens Chair for Translational Neurotherapeutics

    Keywords

    • copy number variation
    • corpus callosum
    • magnetic resonance imaging
    • microdeletion/microduplication syndromes
    • white matter

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