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© Research
Publication : Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology

Associations of the Intellectual Disability Gene MYT1L with Helix-Loop-Helix Gene Expression, Hippocampus Volume and Hippocampus Activation During Memory Retrieval.

Scientific Fields
Diseases
Organisms
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Published in Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology - 01 Dec 2017

Kepa A, Martinez Medina L, Erk S, Srivastava DP, Fernandes A, Toro R, Lévi S, Ruggeri B, Fernandes C, Degenhardt F, Witt SH, Meyer-Lindenberg A, Poncer JC, Martinot JL, Paillère Martinot ML, Müller CP, Heinz A, Walter H, Schumann G, Desrivières S,

Link to Pubmed [PMID] – 28470180

Link to DOI – 10.1038/npp.2017.91

Neuropsychopharmacology 2017 Dec; 42(13): 2516-2526

The fundamental role of the brain-specific myelin transcription factor 1-like (MYT1L) gene in cases of intellectual disability and in the etiology of neurodevelopmental disorders is increasingly recognized. Yet, its function remains under-investigated. Here, we identify a network of helix-loop-helix (HLH) transcriptional regulators controlled by MYT1L, as indicated by our analyses in human neural stem cells and in the human brain. Using cell-based knockdown approaches and microarray analyses we found that (1) MYT1L is required for neuronal differentiation and identified ID1, a HLH inhibitor of premature neurogenesis, as a target. (2) Although MYT1L prevented expression of ID1, it induced expression of a large number of terminal differentiation genes. (3) Consistently, expression of MYT1L in the human brain coincided with neuronal maturation and inversely correlated with that of ID1 and ID3 throughout the lifespan. (4) Genetic polymorphisms that reduced expression of MYT1L in the hippocampus resulted in increased expression of ID1 and ID3, decreased levels of the proneural basic HLH (bHLH) transcriptional regulators TCF4 and NEUROD6 and decreased expression of genes involved in long-term potentiation and synaptic transmission, cancer and neurodegeneration. Furthermore, our neuroimaging analyses indicated that MYT1L expression associated with hippocampal volume and activation during episodic memory recall, as measured by blood-oxygen-level-dependent (BOLD) signals. Overall, our findings suggest that MYT1L influences memory-related processes by controlling a neuronal proliferation/differentiation switch of ID-bHLH factors.

https://pubmed.ncbi.nlm.nih.gov/28470180