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PETBioNewsNewsChild abuse alters expression of stress gene

BioNews

Child abuse alters expression of stress gene

Published 9 June 2009 posted in News and appears in BioNews 497

Author

Lorna Stewart

Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
CC BY 4.0
Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the sequencing output from an automated DNA sequencing machine.

Research published in Nature Neuroscience last week shows that child abuse can alter the expression of a gene that regulates the way the brain controls the stress response. The study was conducted by researchers at the Douglas Mental Health University Institute and McGill University in Montreal, Canada...

Research published in Nature Neuroscience last week shows that child abuse can alter the expression of a gene that regulates the way the brain controls the stress response. The study was conducted by researchers at the Douglas Mental Health University Institute and McGill University in Montreal, Canada, and the Singapore Institute for Clinical Sciences. Lead author Dr Patrick McGowan and his colleagues came to their conclusions after comparisons between samples collected posthumously from the hippocampi of brains of abused suicide victims, suicide victims who had not been abused, and people who had died in accidents and had no history of abuse.


The team found reduced activity of the gene for the glucocorticoid receptor - NC3R1 - in victims of child abuse. And they showed this reduced activity leads to fewer glucocorticoid receptors. Under stress the body produces the hormone cortisol which prepares us for fight-or-flight action. But extended exposure to cortisol can have damaging effects and so receptors to absorb the hormone are necessary to protect the brain. The researchers found that the genes that code for these receptors were about 40 per cent less active in people who had been abused as children than in those who had not. This is likely to explain a feeling of permanent stress, or anxiety, even when no stressors are present in the environment and people showing this gene expression would have had an abnormally heightened response to stress.


The differences seen were 'epigenetic' meaning that the DNA was not altered but instead this particular gene is marked with chemicals that determine how it functions. How long-lasting these alterations are in expression is unknown but could be permanent. This study is one of the first to show epigenetic evidence for a link between childhood abuse and long term psychological problems.


Co-author Dr Gustavo Turecki said 'we know from clinical experience that a difficult childhood can have an impact on the course of a person's life.' His colleague Moshe Szyf added, 'now we are starting to understand the biological implications of such psychological abuse.'

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CC0 1.0
Image by Alan Handyside via the Wellcome Collection. Depicts a human egg soon after fertilisation, with the two parental pronuclei clearly visible.
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Image by Peter Artymiuk via the Wellcome Collection. Depicts the shadow of a DNA double helix, on a background that shows the fluorescent banding of the output from a DNA sequencing machine.
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9 November 2009 • 4 minutes read

What role might epigenetics have in shaping a person's development?

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Epigenetics is about the when and where of gene activity and about shaping development in response to early experience - from internal cues in the growing embryo to the prevailing physical and the social environment. So it is not surprising that discoveries in epigenetics are being enthusiastically embraced by those who find the fatalism often associated with classical genetics rather soul-destroying. But it is important not to overstate the case for epigenetics. DNA sequence, its vari

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