tbx6 Antibody

Introduction to TBX6 Antibody

TBX6 antibodies are immunological reagents designed to detect and study the TBX6 protein, which regulates mesoderm lineage commitment and somite segmentation. These antibodies are widely used in techniques such as Western blot (WB), immunoprecipitation (IP), immunohistochemistry (IHC), and immunofluorescence (IF) .

Key Features:

• Molecular Weight:

  • Calculated: 47 kDa (436 amino acids)

  • Observed: ~58 kDa (due to post-translational modifications) .

• Domains: Contains a conserved T-box DNA-binding domain critical for transcriptional regulation .

• Localization: Nuclear, with roles in axial stem cell fate determination (neural vs. mesodermal) .

Biological Roles:

• Induces nascent mesoderm from pluripotent stem cells (PSCs) .

• Regulates Mesp1 and Eomes expression, essential for cardiovascular and somite lineage specification .

• Inhibits premature differentiation of dermomyotome cells, linking myogenesis to somite boundary formation .

Performance Across Species and Cell Lines

Western Blot Specificity

• R&D Systems: Detects a ~40 kDa band in HT1080 and HL-60 lysates under reducing conditions .

• Proteintech: Identifies a 58 kDa band in human lung and placenta tissues .

Role in Mesoderm Induction

• CRISPR/Cas9 Knockout Studies:

  • Tbx6 KO mouse ESCs show suppressed Mesp1, Eomes, and cardiovascular gene expression (e.g., Tnnt2, Nkx2.5) .

  • Loss of TBX6 reduces Flk1+/PDGFRα+ cardiac mesoderm by >50% .

Temporal Regulation of Lineage Commitment

• Transient vs. Prolonged Expression:

  • Transient Tbx6 induces cardiovascular lineages via BMP/Nodal/Wnt signaling .

  • Prolonged Tbx6 shifts differentiation to somite derivatives (skeletal muscle, chondrocytes) .

Interaction with Regulatory Networks

• Directly regulates mesp-b and ripply1 to coordinate somite boundary formation .

• Competes with transcription factor T (Brachyury) at enhancers like Dll1, altering transcriptional outcomes .

Comparative Analysis of Antibody Performance

Technical Considerations

• Fixation: Optimal detection in immersion-fixed frozen sections (e.g., E9.5 mouse mesoderm) .

• Cross-Reactivity: No reported cross-reactivity with other T-box proteins .

• Storage: Stable at -20°C in PBS with 0.02% sodium azide .

Emerging Insights from Single-Cell RNA-Seq

• TBX6 marks nascent mesoderm populations co-expressing T (Brachyury) and Mesp1 in mouse embryos .

• Downregulated in somites (S-I to S-III), correlating with somite maturation .

Limitations and Future Directions

• Discrepancies in Observed MW: Variability (40–58 kDa) may reflect isoform-specific detection or post-translational modifications .

• In Vivo Functional Replacement: Tbx6 cannot rescue T (Brachyury) deficiency in mice, highlighting functional divergence .