BMAL1 loss in oligodendroglia contributes to abnormal myelination and sleep
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA999672 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR25451851_1.fastq.gz | Fastqsanger.gz | |||
| SRR25451851_2.fastq.gz | Fastqsanger.gz | |||
| SRR25451852_1.fastq.gz | Fastqsanger.gz | |||
| SRR25451852_2.fastq.gz | Fastqsanger.gz | |||
| SRR25451853_1.fastq.gz | Fastqsanger.gz |
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Project description:Myelination depends on maintenance of oligodendrocytes that arise from oligodendrocyte precursor cells (OPCs). We show that OPC-specific proliferation, morphology, and BMAL1 are time-of-day dependent. Knock out of Bmal1 in OPCs during development disrupts expression of genes associated with circadian rhythms, proliferation, density, morphology, and migration, leading to changes in OPC dynamics in a spatio-temporal manner. Furthermore, these deficits translate into thinner myelin, dysregulated cognitive and motor function, and increased sleep fragmentation. OPC-specificBmal1loss in adulthood does not alter OPC density at baseline but impairs remyelination of a demyelinated lesion driven by changes in OPC morphology and migration. Lastly, we show sleep fragmentation is associated with increased prevalence of the demyelinating disorder multiple sclerosis (MS), suggesting a link between MS and sleep that requires further investigation. These findings have broad mechanistic and therapeutic implications for brain disorders that include both myelin and sleep phenotypes.
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Project description:Myelination depends on the maintenance of oligodendrocytes that arise from oligodendrocyte precursor cells (OPCs). We show that OPC-specific proliferation, morphology, and BMAL1 are time-of-day dependent. Knockout of Bmal1 in mouse OPCs during development disrupts the expression of genes associated with circadian rhythms, proliferation, density, morphology, and migration, leading to changes in OPC dynamics in a spatiotemporal manner. Furthermore, these deficits translate into thinner myelin, dysregulated cognitive and motor functions, and sleep fragmentation. OPC-specific Bmal1 loss in adulthood does not alter OPC density at baseline but impairs the remyelination of a demyelinated lesion driven by changes in OPC morphology and migration. Lastly, we show that sleep fragmentation is associated with increased prevalence of the demyelinating disorder multiple sclerosis (MS), suggesting a link between MS and sleep that requires further investigation. These findings have broad mechanistic and therapeutic implications for brain disorders that include both myelin and sleep phenotypes.
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Project description:The timing and quality of sleep is regulated by circadian- and sleep–wake-driven processes. The core clock gene Bmal1 not only affects the circadian timing of sleep, but also the response to sleep deprivation (SD), which, in turn, causes long-term changes in cortical Bmal1 expression. We aimed at separating the circadian- and sleep–wake-driven contributions to BMAL1 binding to its target genes in the cerebral cortex by scheduling 6 SDs at 4 h intervals across the daily 12 h light/12 h dark cycle. We show that BMAL1 rhythmically bound its tissue-specific targets with tissue-specific dynamics, reaching peak binding 2 to 4 h later in the cortex than in the liver, while trough times did not differ. The SDs affected BMAL1 binding most significantly in the cortex, causing 80% of rhythmically bound regions to lose rhythmicity, suggesting BMAL1 binding has a prominent sleep–wake-driven component in this tissue. Analyses of the promoters of other core clock-genes indicate that BMAL1 binding to Bhlhe41 and Nr2d1 have a strong sleep–wake-driven component, while for Per2 two binding regions were identified one with circadian- and the other with sleep–wake-driven binding dynamics. Our results attest to a nonadditive interaction of time-of-day and time-spent-awake affecting the core molecular circadian circuitry. It further highlights that rhythms in gene expression in peripheral tissues are an emergent property of molecular interactions beyond that of the core molecular clock circuitry.
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Project description:Sleep is regulated by intricate homeostatic and circadian systems and is influenced by genetic, environmental, and lifestyle factors. However, the roles of the epitranscriptome in sleep-wake regulation remain to be clarified. Here, we find that mice lacking the rRNA methyltransferase Nsun5 exhibit prolonged wakefulness. The absence of Nsun5 decreases 28S rRNA m5C levels, impairing the translational efficiency of nascent proteins associated with myelination, microtubule-based movement, and ribosome binding. This leads to a decreased number of oligodendrocytes and hypomyelination. These deficits result in increased excitability, particularly within the cortex. Notably, restoring myelination properties with clemastine or blocking the abnormally exposed voltage-gated potassium channels rescues the sleep phenotype, suggesting that reduced sleep is associated with hypomyelination. These findings highlight the significant role of epigenetic modifications in sleep regulation and offer broad mechanistic and therapeutic implications for brain disorders involving both myelin and sleep disturbances.
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Project description:Skeletal mandibular hypoplasia (SMH), one of the common types of craniofacial deformities, seriously affects appearance, chewing, pronunciation, and breathing. Moreover, SMH is prone to inducing obstructive sleep apnea syndrome. We found that brain and muscle ARNT-like 1 (BMAL1), the core component of the molecular circadian oscillator, was significantly decreased in mandibles of juvenile SMH patients. Accordingly, SMH was observed in circadian rhythm-disrupted or BMAL1-deficiency mice. RNA sequencing and protein chip analyses suggested that matrix metallopeptidase 3 (MMP3) is the potential target of BMAL1 during the mandibular developmental process. Interestingly, in juvenile SMH patients, we observed that MMP3 level was increased obviously. Consistently, MMP3 was upregulated during the whole growth period of 3 to 10 weeks in Bmal1-/- mice. Given these findings, we set to characterize the underlying mechanism and found that BMAL1-deficiency enhanced Mmp3 transcription through activating p65 phosphorylation. Together our results provide new insight into the mechanism by which BMAL1 is implicated in the pathogenesis of SMH
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Project description:Sleep is regulated by intricate homeostatic and circadian systems and is influenced by genetic, environmental, and lifestyle factors. However, the roles of the epitranscriptome in sleep-wake regulation remain to be clarified. Here, we find that mice lacking the rRNA methyltransferase Nsun5 exhibit prolonged wakefulness. The absence of Nsun5 decreases 28S rRNA m5C levels, impairing the translational efficiency of nascent proteins associated with myelination, microtubule-based movement, and ribosome binding. This leads to a decreased number of oligodendrocytes and hypomyelination. These deficits result in increased excitability, particularly within the cortex. Notably, restoring myelination properties with clemastine or blocking the abnormally exposed voltage-gated potassium channels rescues the sleep phenotype, suggesting that reduced sleep is associated with hypomyelination. These findings highlight the significant role of epigenetic modifications in sleep regulation and offer broad mechanistic and therapeutic implications for brain disorders involving both myelin and sleep disturbances.
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Project description:Autism spectrum disorder (ASD) is characterized by a complex etiology, with genetic determinants significantly influencing its manifestation. Among these, the Scn2a gene emerges as a pivotal player, crucially involved in oligodendrocyte (OL) function. The present study elucidates the underexplored roles of Scn2a in OL functionality, subsequently affecting myelination and auditory neural processes. The results reveal a nuanced interplay between OLs and axons, where Scn2a deletion causes alterations in OL differentiation and myelination. This disruption, in turn, instigates changes in axonal properties and neuronal activities at the single cell level. Furthermore, OL-specific Scn2a deletion compromises the integrity of neural circuitry within auditory pathways, leading to auditory hypersensitivity—a common sensory abnormality observed in ASD. Through transcriptional profiling, we identified alterations in the expression of myelin-associated genes, highlighting the cellular consequences engendered by Scn2a deletion. In summary, the findings of this study provide unprecedented insights into the pathway from Scn2a deletion in OL to sensory abnormalities in ASD, underscoring the integral role of Scn2a-mediated OL myelination in auditory responses. This research thereby provides novel insights into the intricate tapestry of genetic and cellular interactions inherent in ASD.
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