Article ; Online: Effects of gene dosage and development on subcortical nuclei volumes in individuals with 22q11.2 copy number variations.
Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology
2024 Volume 49, Issue 6, Page(s) 1024–1032
Abstract: The 22q11.2 locus contains genes critical for brain development. Reciprocal Copy Number Variations (CNVs) at this locus impact risk for neurodevelopmental and psychiatric disorders. Both 22q11.2 deletions (22qDel) and duplications (22qDup) are associated ...
Abstract | The 22q11.2 locus contains genes critical for brain development. Reciprocal Copy Number Variations (CNVs) at this locus impact risk for neurodevelopmental and psychiatric disorders. Both 22q11.2 deletions (22qDel) and duplications (22qDup) are associated with autism, but 22qDel uniquely elevates schizophrenia risk. Understanding brain phenotypes associated with these highly penetrant CNVs can provide insights into genetic pathways underlying neuropsychiatric disorders. Human neuroimaging and animal models indicate subcortical brain alterations in 22qDel, yet little is known about developmental differences across specific nuclei between reciprocal 22q11.2 CNV carriers and typically developing (TD) controls. We conducted a longitudinal MRI study in a total of 385 scans from 22qDel (n = 96, scans = 191, 53.1% female), 22qDup (n = 37, scans = 64, 45.9% female), and TD controls (n = 80, scans = 130, 51.2% female), across a wide age range (5.5-49.5 years). Volumes of the thalamus, hippocampus, amygdala, and anatomical subregions were estimated using FreeSurfer, and the linear effects of 22q11.2 gene dosage and non-linear effects of age were characterized with generalized additive mixed models (GAMMs). Positive gene dosage effects (volume increasing with copy number) were observed for total intracranial and whole hippocampus volumes, but not whole thalamus or amygdala volumes. Several amygdala subregions exhibited similar positive effects, with bi-directional effects found across thalamic nuclei. Distinct age-related trajectories were observed across the three groups. Notably, both 22qDel and 22qDup carriers exhibited flattened development of hippocampal CA2/3 subfields relative to TD controls. This study provides novel insights into the impact of 22q11.2 CNVs on subcortical brain structures and their developmental trajectories. |
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MeSH term(s) | Humans ; Female ; Male ; DNA Copy Number Variations/genetics ; Adult ; Gene Dosage ; Adolescent ; Child ; Young Adult ; Middle Aged ; Magnetic Resonance Imaging ; Child, Preschool ; DiGeorge Syndrome/genetics ; DiGeorge Syndrome/pathology ; DiGeorge Syndrome/diagnostic imaging ; Longitudinal Studies ; Hippocampus/diagnostic imaging ; Hippocampus/pathology ; Hippocampus/growth & development ; Brain/diagnostic imaging ; Brain/pathology ; Brain/growth & development ; Amygdala/diagnostic imaging ; Amygdala/pathology ; Thalamus/diagnostic imaging ; Thalamus/growth & development ; Thalamus/pathology ; Organ Size |
Language | English |
Publishing date | 2024-03-02 |
Publishing country | England |
Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't |
ZDB-ID | 639471-1 |
ISSN | 1740-634X ; 0893-133X |
ISSN (online) | 1740-634X |
ISSN | 0893-133X |
DOI | 10.1038/s41386-024-01832-3 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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