Justmehere
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People have referenced trauma causing alterations in genes during this discussion. I'm kind of curious about that. Can anyone give me a link or 2 so I can read more about it? Do you means turning genes on or off within cells, or the kind of genetic changes that can actually be transmitted?
This might help address your question – from: http://science.howstuffworks.com/ptsd2.htm (where further links to original sources can be found)
“There is also some emerging evidence that PTSD may occur on a genetic level. One gene being looked at is the serotonin transporter gene. A paper indicated that mutations in this gene can have an impact on attention to environmental threats, suggesting that if certain people have a hard time modulating attention to threat in the environment (for instance through hypervigilance) they may be more prone to PTSD [source: Wald et al].”
“Another study suggests that PTSD may be the result of epigenetics – changes to the function of genes that can happen in a lifetime. A 2009 study of Detroit residents showed that those who fit the criteria for a PTSD diagnosis had six to seven times the regular amount of epigenetic changes to their genes of those in the control group. Most of the genes that had undergone epigenetic change were responsible for immune system function [source: Uddin, et al].”
That all being said, the article continues on to point out,
“However, the most important factor in the development (or not) of PTSD is the existence of a strong social support network. Time and again, people who have close relationships with those around them have been shown to be much less likely to develop PTSD and more likely to recover from it.”
As for if the trauma can affect genes passed to the next generation, there is some interesting studies coming out on that. The simple answer is not really a yes or no, but kind of.
This study was done in mice: Dead Link Removed
Basically, traumatized mice developed changes in microRNA expression and this was passed on even the third generation, and the affected generations of mice showed behavioral changes to avoid traumatic triggers, even though they were never traumatized.
There have been human studies as well:
Dead Link Removed
“Dr. Isabelle Mansuy and colleagues provide new evidence in the current issue of Biological Psychiatry that some aspects of the impact of trauma cross generations and are associated with epigenetic changes, i.e., the regulation of the pattern of gene expression, without changing the DNA sequence.”
I have a list of other studies and articles done on this subject – but these two articles above touch on the subject pretty well without getting super bogged down in technical details that get really muddled and confusing.
The intergenerational impact of PTSD and trauma is something I have looked into quite a bit. I am the product of three generations of people with PTSD in my family. Both my living grandparents on both sides of my family were diagnosed with PTSD later in life, and both of my own parents as well, and now myself. All three generations have experience trauma first hand, but there are also things that were passed on behaviorally - - i.e. my parents learned certain behaviors from their grandparents - - and I also wonder if the epigenetic effects (the degree to which certain genes are expressed or not expressed) of trauma has been passed on as well through the generations too. These studies seem to indicate that this is possible.
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