CYFIP1 overexpression increases fear response in mice but does not affect social or repetitive behavioral phenotypes.
Catherine Fricano-Kugler, Aaron Gordon, Grace Shin and 5 others
PMID 31198525WHAT IT FOUND
Overexpressing the CYFIP1 gene in mice did not cause social deficits or repetitive behaviors, the core symptoms of autism.
However, the mice showed heightened fear responses and subtle learning difficulties. This suggests CYFIP1 alone does not drive core autistic traits but may influence anxiety and memory.
Key findings
01CYFIP1-overexpressing mice showed no deficits in social interaction or repetitive behaviors, indicating the gene alone does not cause core autism-like symptoms in this model.
02The mice displayed significant increases in conditioned fear and generalized fear, alongside subtle spatial learning deficits, without showing general anxiety or hyperactivity.
03RNA sequencing of the brain's fear center revealed changes in genes related to GABA signaling and myelination, suggesting molecular pathways linked to the observed fear response.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study uses a mouse model, so behavioral findings may not directly translate to human autism spectrum disorder. The effects varied between the two transgenic lines, with one line showing learning deficits and stronger fear responses than the other, suggesting the specific genetic background or expression levels matter. The study focused on CYFIP1 in isolation, whereas human Dup15q syndrome involves the duplication of several genes in the same region, so the combined effect may be different. The authors note that CYFIP1 duplication alone is rare and often neurotypical in humans, implying other genetic factors are needed to produce the full syndrome.
Declared interests
The work was supported by N.I.H. and non-U.S. government grants. The authors declare no competing interests.
The easy way to misread this
Do not interpret these mouse behaviors as evidence that CYFIP1 duplication causes autism in humans. The study explicitly concludes that CYFIP1 overexpression does not produce core social or repetitive behaviors in mice, and human carriers of this specific duplication are often neurotypical.