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2015 ; 23
(6
): 781-9
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MBD5 haploinsufficiency is associated with sleep disturbance and disrupts
circadian pathways common to Smith-Magenis and fragile X syndromes
#MMPMID25271084
Mullegama SV
; Pugliesi L
; Burns B
; Shah Z
; Tahir R
; Gu Y
; Nelson DL
; Elsea SH
Eur J Hum Genet
2015[Jun]; 23
(6
): 781-9
PMID25271084
show ga
Individuals with autism spectrum disorders (ASD) who have an identifiable
single-gene neurodevelopmental disorder (NDD), such as fragile X syndrome (FXS,
FMR1), Smith-Magenis syndrome (SMS, RAI1), or 2q23.1 deletion syndrome (del
2q23.1, MBD5) share phenotypic features, including a high prevalence of sleep
disturbance. We describe the circadian deficits in del 2q23.1 through caregiver
surveys in which we identify several frequent sleep anomalies, including
night/early awakenings, coughing/snoring loudly, and difficulty falling asleep.
We couple these findings with studies on the molecular analysis of the circadian
deficits associated with haploinsufficiency of MBD5 in which circadian gene mRNA
levels of NR1D2, PER1, PER2, and PER3 were altered in del 2q23.1 lymphoblastoid
cell lines (LCLs), signifying that haploinsufficiency of MBD5 can result in
dysregulation of circadian rhythm gene expression. These findings were further
supported by expression microarrays of MBD5 siRNA knockdown cells that showed
significantly altered expression of additional circadian rhythm signaling pathway
genes. Based on the common sleep phenotypes observed in del 2q23.1, SMS, and FXS
patients, we explored the possibility that MBD5, RAI1, and FMR1 function in
overlapping circadian rhythm pathways. Bioinformatic analysis identified
conserved putative E boxes in MBD5 and RAI1, and expression levels of NR1D2 and
CRY2 were significantly reduced in patient LCLs. Circadian and mTOR signaling
pathways, both associated with sleep disturbance, were altered in both MBD5 and
RAI1 knockdown microarray data, overlapping with findings associated with FMR1.
These data support phenotypic and molecular overlaps across these syndromes that
may be exploited to provide therapeutic intervention for multiple disorders.
|*Haploinsufficiency
[MESH]
|Cell Line
[MESH]
|Child
[MESH]
|Child, Preschool
[MESH]
|Circadian Rhythm/*genetics
[MESH]
|Cryptochromes/genetics/metabolism
[MESH]
|DNA-Binding Proteins/*genetics
[MESH]
|Female
[MESH]
|Fragile X Mental Retardation Protein/genetics/metabolism
[MESH]