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Epigenomic analysis of Parkinson’s disease neurons identifies TET2 loss as neuroprotective [TET2_LPS_RNA_Seq]

ABSTRACT: Epigenetic control of enhancers is centrally involved in modifying neuronal functions and may contribute to Parkinson's disease (PD) pathogenesis. Here, we comprehensively profile DNA methylation at enhancers genome-wide in neurons of 57 PD patients and 48 healthy individuals. There is a widespread increase in cytosine modifications at enhancers in PD neurons, which is partly due to elevated hydroxymethylation levels. Epigenetic dysregulation of enhancers in PD converge on transcriptional abnormalities affecting neuronal signaling and immune activation pathways. In particular, PD patients exhibit an epigenetic and transcriptional upregulation of TET2, a master-regulator of cytosine modification status. TET2 inactivation in a neuronal cell line enriches for cytosine modification changes that are reciprocal to those observed in PD neurons. Furthermore, Tet2 inactivation in mice fully prevents dopaminergic neuronal loss in the substantia nigra induced by prior inflammation. Tet2 loss in mice also attenuates transcriptional immune responses to an inflammatory trigger. Thus, widespread epigenetic dysregulation of enhancers in PD neurons may, in part, be mediated by increased TET2 expression. Decreased Tet2 activity is neuroprotective, in vivo, and may be a novel therapeutic target for PD.

ORGANISM(S): Mus musculus

PROVIDER: GSE135334 | GEO | 2020/06/19

REPOSITORIES: GEO

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Epigenomic analysis of Parkinson’s disease neurons identifies TET2 loss as neuroprotective [PD_TET2_Bisulfite_Padlock_Seq]

Project description:Epigenetic control of enhancers is centrally involved in modifying neuronal functions and may contribute to Parkinson's disease (PD) pathogenesis. Here, we comprehensively profile DNA methylation at enhancers genome-wide in neurons of 57 PD patients and 48 healthy individuals. There is a widespread increase in cytosine modifications at enhancers in PD neurons, which is partly due to elevated hydroxymethylation levels. Epigenetic dysregulation of enhancers in PD converge on transcriptional abnormalities affecting neuronal signaling and immune activation pathways. In particular, PD patients exhibit an epigenetic and transcriptional upregulation of TET2, a master-regulator of cytosine modification status. TET2 inactivation in a neuronal cell line enriches for cytosine modification changes that are reciprocal to those observed in PD neurons. Furthermore, Tet2 inactivation in mice fully prevents dopaminergic neuronal loss in the substantia nigra induced by prior inflammation. Tet2 loss in mice also attenuates transcriptional immune responses to an inflammatory trigger. Thus, widespread epigenetic dysregulation of enhancers in PD neurons may, in part, be mediated by increased TET2 expression. Decreased Tet2 activity is neuroprotective, in vivo, and may be a novel therapeutic target for PD.

2020-06-19 | GSE135332 | GEO

Epigenomic analysis of Parkinson’s disease neurons identifies TET2 loss as neuroprotective [PD_hMeDIP_Seq]

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Epigenomic analysis of Parkinson’s disease neurons identifies TET2 loss as neuroprotective [TET2i_Bisulfite_Padlock_seq]

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Distinct and stage-specific contributions of TET1 and TET2 to stepwise cytosine oxidation in the transition from naive to primed pluripotency

Project description:Cytosine DNA bases can be methylated by DNA methyltransferases and subsequently oxidized by TET proteins. The resulting 5-hydroxymethylcytosine (5hmC), 5-formylcytosine (5fC), and 5-carboxylcytosine (5caC) are considered demethylation intermediates as well as stable epigenetic marks. To dissect the contribution of these cytosine modifying enzymes, we generated combinations of Tet knockout (KO) embryonic stem cells (ESCs) and systematically measured protein and DNA modification levels at the transition from naive to primed pluripotency. Whereas the increase of genomic 5-methylcytosine (5mC) levels during exit from pluripotency correlated with an upregulation of the de novo DNA methyltransferases DNMT3A and DNMT3B, the subsequent oxidation steps turned out to be far more complex. The strong increase of oxidized cytosine bases (5hmC, 5fC, and 5caC) was accompanied by a drop in TET2 levels, yet the analysis of KO cells suggested that TET2 is responsible for most 5fC formation. The comparison of modified cytosine and enzyme levels in Tet KO cells revealed distinct and differentiation-dependent contributions of TET1 and TET2 to 5hmC and 5fC formation arguing against a processive mechanism of 5mC oxidation. The apparent independent steps of 5hmC and 5fC formation suggest yet to be identified mechanisms regulating TET activity and may constitute another layer of epigenetic regulation.

2020-07-24 | PXD019514 | Pride

Epigenetic contributions to hemisphere asymmetry in healthy brain, aging, and Parkinson’s disease

Project description:Hemispheric asymmetry in neuronal processes is a fundamental feature of the human brain and drives symptom lateralization in Parkinson's disease (PD), but its molecular determinants are unknown. Here, we determine epigenetic changes and genes involved in hemispheric asymmetry in the healthy and PD brain. Neurons of healthy individuals exhibit numerous hemispheric differences in DNA methylation, affecting genes implicated in neurodegenerative diseases. In PD patients, hemispheric asymmetry in DNA methylation is even greater and involves many PD risk genes. Moreover, the lateralization of clinical PD symptoms involves epigenetic, transcriptional, and proteomic differences across hemispheres that affect neurodevelopment, immune activation, and synaptic transmission. In aging, healthy neurons demonstrate a progressive loss of hemisphere asymmetry in epigenomes that is amplified in PD. For PD patients, a long disease course is associated with retaining more hemispheric asymmetry in neuronal epigenomes. Hemispheric differences in epigenetic gene regulation are prevalent in neurons and may affect the progression and symptoms of PD.

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Hemispheric asymmetry in the human brain and in Parkinson’s disease is linked to divergent epigenetic patterns in neurons [RNA-seq]

Project description:Background Hemispheric asymmetry in neuronal processes is a fundamental feature of the human brain and drives symptom lateralization in Parkinson's disease (PD), but its molecular determinants are unknown. Here, we identify divergent epigenetic patterns involved in hemispheric asymmetry by profiling DNA methylation in isolated prefrontal cortex neurons from control and PD brain hemispheres. DNA methylation is fine-mapped at enhancers and promoters, genome-wide, by targeted bisulfite sequencing in two independent sample cohorts. Results We find that neurons of the human prefrontal cortex exhibit hemispheric differences in DNA methylation. Hemispheric asymmetry in neuronal DNA methylation patterns is largely mediated by differential CpH methylation, and chromatin conformation analysis finds that it targets thousands of genes. With aging, there is a loss of hemispheric asymmetry in neuronal epigenomes, such that hemispheres epigenetically converge in late life. In neurons of PD patients, hemispheric asymmetry in DNA methylation is greater than in controls and involves many PD risk genes. Epigenetic, transcriptomic, and proteomic differences between PD hemispheres correspond to the lateralization of PD symptoms, with abnormalities being most prevalent in the hemisphere matched to side of symptom predominance. Hemispheric asymmetry and symptom lateralization in PD is linked to genes affecting neurodevelopment, immune activation, and synaptic transmission. PD patients with a long disease course have greater hemispheric asymmetry in neuronal epigenomes than those with a short disease course. Conclusions Hemispheric differences in epigenetic gene regulation are prevalent in neurons and may affect the progression and symptoms of PD.

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Hemispheric asymmetry in the human brain and in Parkinson’s disease is linked to divergent epigenetic patterns in neurons

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Hemispheric asymmetry in the human brain and in Parkinson’s disease is linked to divergent epigenetic patterns in neurons [Bisulfite_Seq_replication_cohort]

2020-02-12 | GSE135035 | GEO

PU.1-dependent enhancer inhibition separates clonal hematopoiesis from malignant transformation (ATAC-Seq)

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