"Déjà vu" in an autism gene mouse model modifies social mores.

Genetic and environmental factors during development are involved in autism, and in this issue of Neuron Krüttner et al. (2022) find environment may play a more acute role in modulating autism behavior in a Shank3 exon 21 deletion mutant mouse (Shank3ΔC/ΔC). The authors explore the underlying circuit mechanisms in detail.