What Is ASTN2 and Why Does It Matter?

Astrotactin-2 (ASTN2) is a transmembrane glycoprotein encoded by the ASTN2 gene on human chromosome 9q33.1. It is a paralog of Astrotactin-1 (ASTN1) and belongs to the astrotactin family of neuronal migration proteins. ASTN2 is predominantly expressed in the developing and mature central nervous system, where it localizes to the neuronal cell surface and plays a pivotal role in glial-guided neuronal migration—a fundamental process for the proper laminar organization of the cerebral cortex and cerebellum.

Beyond its developmental role, ASTN2 has been implicated in the regulation of surface expression of other neuronal membrane proteins, including ASTN1, through an endosomal trafficking and lysosomal degradation mechanism. Dysregulation of ASTN2 has been associated with neurodevelopmental and neuropsychiatric conditions, including autism spectrum disorder (ASD), schizophrenia, and attention deficit hyperactivity disorder (ADHD), making it a protein of significant translational interest.

Biochemical Properties of Recombinant Human ASTN2 Protein

Recombinant Human ASTN2 Protein (rp369103) is produced using recombinant expression systems to yield a high-purity protein suitable for in vitro research applications. As a glycoprotein, ASTN2 carries post-translational modifications including N-linked glycosylation, which are important for its proper folding, stability, and interaction with binding partners on neuronal and glial cell surfaces.

The native human ASTN2 protein contains fibronectin type III (FNIII) repeats and epidermal growth factor (EGF)-like domains within its extracellular region, structural features shared with its paralog ASTN1. These domains are thought to mediate protein–protein and cell–cell interactions relevant to neuronal adhesion and migration. Researchers should consult the product datasheet for lot-specific details including purity grade, formulation buffer, endotoxin levels, and recommended storage conditions.

Research Applications

Recombinant Human ASTN2 Protein is suitable for a range of in vitro research applications, including but not limited to:

• Binding and interaction assays: Used to study protein–protein interactions between ASTN2 and its binding partners, such as ASTN1 and other neuronal membrane proteins, via co-immunoprecipitation, pull-down assays, or surface plasmon resonance (SPR).
• Cell adhesion and migration studies: Employed as a substrate or soluble factor to investigate its role in neuronal cell adhesion and glial-guided migration in vitro.
• Antibody validation: Serves as a positive control antigen for validating ASTN2-specific antibodies in ELISA, Western blot, and immunofluorescence assays.
• Functional and mechanistic studies: Supports research into the endosomal trafficking of ASTN1 and ASTN2, and their roles in regulating synaptic protein surface expression.
• Disease model research: Supports studies investigating the molecular basis of ASTN2-associated neurodevelopmental disorders, including ASD and schizophrenia.

Handling, Storage, and Quality Considerations

To maintain the activity and integrity of Recombinant Human ASTN2 Protein, adhere to the following general best practices:

• Storage: Store lyophilized or liquid protein at the temperature specified on the product datasheet, typically −20 °C or −80 °C. Avoid repeated freeze–thaw cycles by preparing single-use aliquots upon first reconstitution.
• Reconstitution: Reconstitute lyophilized protein in the recommended buffer as stated on the datasheet. Allow the vial to equilibrate to room temperature before opening, and centrifuge briefly before use.
• Handling: Use low-binding tubes and pipette tips to minimize protein adsorption losses, particularly when working at low concentrations.
• Quality control: Aladdin Scientific's recombinant proteins undergo standard quality control testing. Researchers should review the certificate of analysis (CoA) for lot-specific purity, biological activity data, and endotoxin levels before use.

Always consult the product-specific datasheet for authoritative handling instructions, as formulations may vary between lots.

ASTN2 in Neuropsychiatric Disease Research

Copy number variations (CNVs) and rare deletions affecting the ASTN2 gene locus have been identified in genome-wide association studies and patient cohort analyses as risk factors for several neurodevelopmental and neuropsychiatric conditions. These include autism spectrum disorder (ASD), schizophrenia, bipolar disorder, and ADHD. The mechanistic link is thought to involve disrupted neuronal migration and aberrant synaptic development resulting from ASTN2 haploinsufficiency or loss of function.

Recombinant Human ASTN2 Protein provides researchers with a defined, high-quality tool to dissect these mechanisms in cell-based and biochemical assays. By combining recombinant ASTN2 with patient-derived neuronal models (e.g., iPSC-derived neurons) or established cell lines, investigators can examine how altered ASTN2 dosage or function affects downstream cellular phenotypes relevant to psychiatric disease pathology.