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SynGAP is a postsynaptic density (PSD) protein that binds to PDZ domains of the scaffold protein PSD-95. We previously reported that heterozygous deletion of  Syngap1  in mice is correlated with increased steady-state levels of other key PSD proteins that bind PSD-95, although the level of PSD-95 remains constant (Walkup et al., 2016). For example, the ratio to PSD-95 of Transmembrane AMPA-Receptor-associated Proteins (TARPs), which mediate binding of AMPA-type glutamate receptors to PSD-95, was increased in young  Syngap1 +/-  mice. Here we show that only females and not males show a highly significant correlation between an increase in TARP and a decrease in synGAP in the PSDs of  Syngap1 +/-  rodents. The data reveal a sex difference in the adaptation of the PSD scaffold to synGAP haploinsufficiency.

A sex difference in the response of the rodent postsynaptic density to synGAP haploinsufficiency