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Link Between Brain Cell Development and Risk of Schizophrenia Discovered

by Mozhgan Jamshidi Eyni
January 15, 2022
in Uncategorized
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Link Between Brain Cell Development and Risk of Schizophrenia Discovered

This research is the first time that genetic disruption of specific cell processes crucial to brain development has been linked to disease risk in a wide range of psychiatric disorders.

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Summary: The genetic disruption of specific cell processes crucial to brain development was linked to disease risk in a wide range of mental health disorders including schizophrenia.

Source: Cardiff University

Scientists from Cardiff University have discovered new links between the breakdown in brain cell development and the risk of schizophrenia and other psychiatric disorders.

Genetic risk factors are known to disrupt brain development in a number of these disorders, but little is known about which aspects of this process are affected.

This research is the first time that genetic disruption of specific cell processes crucial to brain development has been linked to disease risk in a wide range of psychiatric disorders.

The findings are published today in the journal Nature Communications.

The study was jointly led by Dr. Andrew Pocklington from the Division of Psychological Medicine and Clinical Neurosciences at Cardiff University and Dr. Eunju Jenny Shin from the Neuroscience and Mental Health Research Institute at Cardiff University and now at Keele University.

Dr. Pocklington said: “Genetic factors play a significant role in determining a person’s risk of developing psychiatric disorders. Uncovering biological processes impacted by these genetic risk factors is a major step towards understanding the causes of disease.”

Dr. Shin said: “To truly understand the root causes of psychiatric disorders, we focused on studying the development of brain cells. The knowledge gained through this approach may ultimately help guide the development of novel therapies or help explain why some individuals respond to some treatments but not others.”

The scientists studied the birth and early development of human brain cells—a process known as neurogenesis—in vitro using human pluripotent stem cells.

They identified several sets of genes that are switched on during neurogenesis—bothin vitro and in human foetal brain—with each set appearing to play a distinct functional role. The researchers showed that genetic risk factors contributing to schizophrenia and other psychiatric disorders were highly concentrated in these sets.

Dr. Shin said: “In vitro experiments showed that when activation of these sets is disrupted, the shape, movement and electrical activity of developing brain cells is altered, linking changes in these properties to disease.”

Disorders linked to disruption of these genes included both early onset conditions (developmental delay, autism and ADHD) and, more surprisingly, conditions with a later onset (bipolar disorder, major depression) for which disruption of early brain development is not generally thought to play a large role.

This raises the question of whether some of these genes—which are first switched on long before birth—remain active later in life and contribute to mature brain function, where they can potentially be targeted therapeutically.

Dr. Pocklington said: “Previous studies have shown that genes active in mature brain cells are enriched for common genetic variants contributing to schizophrenia. Much of this enrichment was captured by the early developmental gene sets, which seem to contain a greater burden of common genetic risk factors.

“This suggests that some biological pathways first switched on in the early pre-natal brain may remain active in later life, with genetic variation in these pathways contributing to disease by disrupting both development and mature brain function.”

Further work is needed to map out the full range of developmental processes disrupted in different psychiatric disorders and explore their longer-term effects on the brain.

Dr. Shin said: “Although much remains to be uncovered, our findings provide valuable insight into the developmental origins of psychiatric disorders such as schizophrenia.”

Abstract

Transcriptional programs regulating neuronal differentiation are disrupted in DLG2 knockout human embryonic stem cells and enriched for schizophrenia and related disorders risk variants

Coordinated programs of gene expression drive brain development. It is unclear which transcriptional programs, in which cell-types, are affected in neuropsychiatric disorders such as schizophrenia.

Here we integrate human genetics with transcriptomic data from differentiation of human embryonic stem cells into cortical excitatory neurons. We identify transcriptional programs expressed during early neurogenesis in vitro and in human foetal cortex that are down-regulated in DLG2−/− lines. Down-regulation impacted neuronal differentiation and maturation, impairing migration, morphology and action potential generation.

Genetic variation in these programs is associated with neuropsychiatric disorders and cognitive function, with associated variants predominantly concentrated in loss-of-function intolerant genes. Neurogenic programs also overlap schizophrenia GWAS enrichment previously identified in mature excitatory neurons, suggesting that pathways active during prenatal cortical development may also be associated with mature neuronal dysfunction.

Our data from human embryonic stem cells, when combined with analysis of available foetal cortical gene expression data, de novo rare variants and GWAS statistics for neuropsychiatric disorders and cognition, reveal a convergence on transcriptional programs regulating excitatory cortical neurogenesis.

About this mental health research news

Author: Press Office
Source: Cardiff University
Contact: Press Office – Cardiff University

Original Research: Open access.
“Transcriptional programs regulating neuronal differentiation are disrupted in DLG2 knockout human embryonic stem cells and enriched for schizophrenia and related disorders risk variants” by Bret Sanders, Daniel D’Andrea, Mark O. Collins, Elliott Rees, Tom G. J. Steward, Ying Zhu, Gareth Chapman, Sophie E. Legge, Antonio F. Pardiñas, Adrian J. Harwood, William P. Gray, Michael C. O’Donovan, Michael J. Owen, Adam C. Errington, Derek J. Blake, Daniel J. Whitcomb, Andrew J. Pocklington & Eunju Shin. Nature Communications

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