Free D-aspartate modulates the expression of proteins linked to schizophrenia and autism spectrum disorder during early postnatal life.

Scientists studied a natural brain chemical called D-aspartate that is important during early brain development. They found that this chemical affects many proteins in the developing brain, including some linked to autism and schizophrenia. This research helps us better understand how brain chemistry during early development might influence conditions like autism.

This study investigated how D-aspartate, a natural brain compound that peaks during early development, affects protein expression in the developing brain. Researchers used genetically modified mice that lack D-aspartate from birth and analyzed brain proteins using advanced mass spectrometry techniques. The findings revealed that D-aspartate influences proteins involved in glutamate neurotransmission, brain development, and cellular structure. Importantly, some of the affected proteins are associated with molecular pathways linked to autism spectrum disorder and schizophrenia, suggesting D-aspartate metabolism may play a role in neurodevelopmental conditions.

This research provides new insights into how early brain chemistry affects development and potential psychiatric disorders.

Provides preliminary evidence for D-aspartate's role in early neurodevelopment and potential links to autism and schizophrenia. May inform future research into early biomarkers or therapeutic targets, though translation to human clinical applications requires further investigation.

Study conducted in mouse models only; sample size not reported; mechanisms remain unclear; proteomic findings need functional validation; unclear how findings translate to human neurodevelopment or clinical applications.

D-aspartate is an endogenous agonist of NMDA and mGlu5 receptors, with a distinctive spatiotemporal expression profile that peaks in the prenatal and early postnatal brain. This suggests a critical role for D-aspartate metabolism in modulating neurodevelopmental processes linked to glutamatergic neurotransmission. However, the precise mechanisms through which D-aspartate exerts its effects remain unclear. To elucidate the molecular pathways orchestrated by early D-aspartate signalling, we employed a knock-in mouse model characterized by constitutive D-aspartate depletion due to the prenatal expression of its degradative enzyme, D-aspartate oxidase.

Using an advanced quantitative proteomic approach based on Tandem Mass Tag isobaric labelling and nano-liquid chromatography coupled with high-resolution tandem mass spectrometry, we investigated the proteomic variations induced by D-aspartate depletion during postnatal brain development, comparing Ddo knock-in mice with their wild-type littermates. Our findings reveal that D-aspartate modulates the neonatal expression of proteins involved in glutamatergic neurotransmission, nervous system development, and cytoskeleton organization. Moreover, proteomic analysis identified a subset of D-aspartate-regulated proteins mapping molecular pathways associated with autism spectrum disorder and schizophrenia. These findings offer new perspectives on the complex protein networks influenced by D-aspartate metabolism in the developing brain and highlight its potential impact on cerebral function in health and psychiatric disorders.