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How that little amygdala makes a big difference in autism

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The amygdala has been shown to be differently sized in autistic people – at first it is too big then it becomes smaller than typically developing people. But how early are these differences seen and does it relate to a diagnosis? The Infant Brain Imaging Study tackled this question in a recent study which compared those who were likely to develop autism at 6 months to those with Fragile X to see if there were differences and if it was specific to autism. Their findings will surprise you and have implications for targeted supports and interventions.

https://pubmed.ncbi.nlm.nih.gov/35331012/

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Environmental factors as both causes and interventions?

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Environmental exposures, including toxic chemicals, can contribute to the causes of ASD. But how do other environmental factors, like behavioral supports, work in the brain to improve behaviors associated with ASD? For this, you need a broad interpretation of the term “environmental” and an animal model so you can see the mechanism involved. Studies show while environmental factors can contribute, they can also provide modifications in cellular and molecular function which support learning and improved developmental trajectory. Finally, on a different topic, are autistic adults more likely to be involved in a crime compared to other groups? No, they are not, but there are factors which affect the risk of being involved with the criminal justice system, at least in the UK. Read more in the studies below.

https://pubmed.ncbi.nlm.nih.gov/34972219/

https://pubmed.ncbi.nlm.nih.gov/35259351/

https://pubmed.ncbi.nlm.nih.gov/35261275/

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Is Autism Inflammation Nation?

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Several studies have linked the immune system to autism, but how are they connected? Two new studies this week illustrate differences in immune function in those with a diagnosis compared to those without, and also find differences in the blood of of pregnant mothers who go on to have an autistic child. Women who go on to have autistic girls show higher levels and more inflammatory markers than mothers who go on to have boys, the finding of elevated IL1 is now a finding that has been replicated across countries. However, it’s too early to tell if this information can be used to help with a diagnosis and it’s probably not specific to autism. But the message is the same as it was before: getting sick during pregnancy is not great. Get vaccinated! Stay away from sick people and wash your hands.

https://pubmed.ncbi.nlm.nih.gov/35110990/

https://pubmed.ncbi.nlm.nih.gov/34987169/

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Four problems and a solution: Is there a way to solve the heterogeneity problem in research?

While a diagnosis of autism spectrum disorder may encompass many strengths, challenges, features and conditions, it is becoming increasingly difficult for researchers to figure out what is autism, and how to help those on the full spectrum. This week’s ASF podcast summarizes the challenges and a possible solution to grouping people according to their behavioral features. However, not everyone agrees with this approach. What do you think? How can researchers best help people across the spectrum recognizing the unique needs of those with different symptoms? Share your thoughts in the comments.

https://onlinelibrary.wiley.com/doi/epdf/10.1002/aur.2494

https://onlinelibrary.wiley.com/doi/epdf/10.1002/aur.2529

https://onlinelibrary.wiley.com/doi/epdf/10.1002/aur.2547

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Help for those with minimal verbal ability

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On this week’s ASF weekly science podcast, we provide a recent review on influences of speech and language both in those with ASD who are verbally fluent, as those who have minimal verbal ability. What does the brain look like in those with minimal verbal ability and are there interventions to help improve social communication ability in those with not just minimal verbal ability but also cognitive disability? What are some early markers or behaviors that predict understanding and communicating? Listen to learn more.

https://pubmed.ncbi.nlm.nih.gov/32909382/

https://pubmed.ncbi.nlm.nih.gov/32881387/

https://pubmed.ncbi.nlm.nih.gov/32827357/

https://pubmed.ncbi.nlm.nih.gov/32812191/

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From being high to being aggressive

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There are many many potential factors that influence a diagnosis of ASD that have been underexplored, and recreational drugs are one of them. Of course it would never explain all the cases of ASD, not one singular thing does, but does cannabis consumption during pregnancy lead to an increased probability of having a child with ASD? As it turns out, yes, a small increase, meaning it isn’t the only thing causing ASD but: JUST SAY NO if you are pregnant. On the other end of the spectrum is aggression, a completely horrible feature of some people with ASD. About 30% of people who are aggressive and have an ASD diagnosis are not responsive to any medications or therapies, which is horrifying. Researchers in Canada and Brazil have studied the brains of this group, with what is called “refractory aggression” to try to get to the mechanism.

https://pubmed.ncbi.nlm.nih.gov/32778828/

https://pubmed.ncbi.nlm.nih.gov/32762791/

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The autism brain at 3 months old

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Biological features of ASD can be seen long before behavioral impairments in children are seen. Researchers are now studying the activity of the brain at 3 months in infants that go on to develop autism and those that do not. There are distinct features in the brain seen in a 3 month old that goes on to develop ASD. In addition, excessive brain activity resulting in seizures can increase the probability of a later ASD diagnosis in infants with a rare genetic disorder called Tuberous Sclerosis. This podcast will explain how connectivity and activity in a 3 month old can influence a later diagnosis. What we don’t know more about is those intervening months, and what can be done to mitigate symptoms.

https://www.sciencedirect.com/science/article/abs/pii/S2451902220301403?via%3Dihub

https://onlinelibrary.wiley.com/doi/epdf/10.1002/acn3.51128

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Guys, we all need exercise

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People with autism are less likely to be physically active and more likely to be sedentary.    A number of studies have looked into different physical activities, both group based and individually, on improvements in health as well as core features of autism, and most have had positive results.  New animal model research demonstrates a benefit of exercise using the maternal immune activation model of ASD, pruning back the excess of connections and cell fibers.  As people with autism also have too many connections in the brain, this may have a direct therapeutic benefit.  But besides all the scientific conjecture, we all need more exercise, physical activity interventions seem to only help, not hurt, people across the spectrum, and should be used to complement, not replace existing therapies.

 

 

https://www.ncbi.nlm.nih.gov/pubmed/29693781

 

https://www.ncbi.nlm.nih.gov/pubmed/31102193

 

https://link.springer.com/article/10.1007%2Fs10803-019-04050-9

 

https://www.cell.com/cell-reports/retrieve/pii/S2211124719306266?_returnURL=https%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS2211124719306266%3Fshowall%3Dtrue

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Yeah, another study about autistic poop

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This week’s podcast includes a summary of the new study, this time in an animal model, looking at microbiome transplantation.  Because this was more of an experimental model, the researchers could be more rigorous in their design and look at things like behavior, brain activity, and specific biological pathways.  While a mouse does not have autism, transplantation of the autism microbiome resulted in autistic-like behaviors.   Second, a hopeful message of the value of participating in research on outcomes – those infants that were tracked prospectively showed improved outcomes later on, suggesting that all of the extra attention they get leads to a reduction in symptoms and an improvement in adaptive behavior.  Even if you do not have a family history of autism – participate in research.  It’s good for your child, and it’s good for other people’s children.

 

https://www.cell.com/cell/fulltext/S0092-8674(19)30502-1 

https://www.ncbi.nlm.nih.gov/pubmed/31032937

 

 

 

 

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An update on females with autism, on the double

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Females with autism are different than males with autism in a lot of ways.  This week, researchers used twins to examine the differences between males and females with autism in their brain structure and how it’s associated with autism traits, not a diagnosis.  To do this, researchers in Sweden turned to twins.  As it turns out, females have more of a diversity of differences in brain changes compared to boys, supporting the female protective effect.  But how to females with autism feel?  As them!  A group in the UK interviewed over 20 women on the spectrum or their parents to find out what concerns them most and what they find most challenging.

Both articles cited this week are open access:

https://link.springer.com/article/10.1007%2Fs10803-019-03906-4     https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6373677/