Identification of amygdala-expressed genes associated with autism spectrum disorder.
Maria Jesus Herrero, Dmitry Velmeshev, David Hernandez-Pineda and 7 others
PMID 32460837WHAT IT FOUND
Most high-confidence autism genes are active in the amygdala during early brain development.
In adult autistic brains, these genes show altered activity in excitatory neurons and astrocytes, suggesting these cells are key sites where genetic risk translates to social difficulties.
Key findings
01271 of the 295 high-confidence autism genes tested were expressed in the developing human amygdala.
02In postmortem tissue from adults with autism, 183 genes were found to have altered expression in the amygdala compared to controls.
03The genes with altered expression in the autistic amygdala were enriched in excitatory neurons and fibrous astrocytes.
STILL TO COME
How it was doneWhat they found
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What it does not show
The human tissue analysis used a very small sample size of only ten people (five with autism, five controls). The tissue came from adults and children aged 4 to 20 years, so it is unclear if the gene changes observed were the cause of autism or a result of the brain adapting to the condition over time. The study did not include any clinical outcomes, behavioral measures, or therapy data. Many of the identified genes are expressed in multiple brain regions, not just the amygdala, so the specificity of these findings to social behavior is not proven.
Declared interests
The work was supported by the National Institutes of Health, the Simons Foundation Autism Research Initiative, and the California Institute for Quantitative Biosciences.
The easy way to misread this
Do not interpret these gene expression changes as a diagnostic tool or a target for immediate therapy. The study is based on postmortem tissue from only ten individuals and describes biological mechanisms without linking them to specific behavioral outcomes or treatment responses.