Neural stem cell differentiation is dictated by distinct actions of nuclear receptor corepressors and histone deacetylases.

Signaling factors including retinoic acid (RA) and thyroid hormone (T3) promote neuronal, oligodendrocyte, and astrocyte differentiation of cortical neural stem cells (NSCs). However, the functional specificity of transcriptional repressor checkpoints controlling these differentiation programs remains unclear. Here, we show by genome-wide analysis that histone deacetylase (HDAC)2 and HDAC3 show overlapping and distinct promoter occupancy at neuronal and oligodendrocyte-related genes in NSCs.

The non-coding snRNA 7SK controls transcriptional termination, poising, and bidirectionality in embryonic stem cells.

Background: Pluripotency is characterized by a unique transcriptional state, in which lineage-specification genes are poised for transcription upon exposure to appropriate stimuli, via a bivalency mechanism involving the simultaneous presence of activating and repressive methylation marks at promoter-associated histones. Recent evidence suggests that other mechanisms, such as RNA polymerase II pausing, might be operational in this process, but their regulation remains poorly understood.

Results: Here we identify the non-coding snRNA 7SK as a multifaceted regulator of transcription in embryonic stem cells.

Effect of α-synuclein on amyloid β-induced toxicity: relevance to Lewy body variant of Alzheimer disease.

Alzheimer's disease, the most prevalent age-related neurodegenerative disease, is characterized by the presence of extracellular senile plaques composed of amyloid-beta (Aβ) peptide and intracellular neurofibrillary tangles. More than 50 % of Alzheimer's disease (AD) patients also exhibit abundant accumulation of α-synuclein (α-Syn)-positive Lewy bodies. This Lewy body variant of AD (LBV-AD) is associated with accelerated cognitive dysfunction and progresses more rapidly than pure AD.

Epigenetics in neurodegeneration: a new layer of complexity.

Several diseases are known to have a multifactorial origin, depending not only on genetic but also on environmental factors. They are called "complex disorders" and include cardiovascular disease, cancer, diabetes, and neuropsychiatric and neurodegenerative diseases. In the latter class, Alzheimer's (AD) and Parkinson's diseases (PD) are by far the most common in the elderly and constitute a tremendous social and economical problem.

Alzheimer's disease: the quest to understand complexity.

Alzheimer's disease (AD) is a complex disorder of the central nervous system that affects an increasing number of people worldwide due to the overall aging of the human population. In addition to genetics, which accounts for a small fraction of all cases, the etiology is multifactorial with other currently unknown triggers. It is crucial to unravel the physiological mechanisms that, being disrupted, could lead to neurodegeneration, as this knowledge could ultimately lead to the identification of novel neuroprotective strategies that could be used as therapeutics.