Immature neuron markers are widely used to study cell genesis and proliferation in neurogenic regions of the adult human, mouse, and rat brains.

What are immature neurons and IPC?

Radial glia divides asymmetrically to produce one radial glial cell and one intermediate progenitor cell (IPC). These precursor cells represent distinct cell types involved in neurogenesis within the adult brain. IPCs differentiate into post-mitotic immature neurons, which migrate to their final destination in the nervous system and integrate into the neuronal network.

T-box brain protein 1 (TBR1)

T-box brain protein 1 (TBR1) is a transcription factor and a well-known marker of immature postmitotic neurons in the developing cerebral cortex. It is expressed in excitatory glutamatergic neurons derived from the pallium and is required for early neuronal differentiation, migration, and cortical layer formation. TBR1 expression follows a sequential pattern during neurogenesis, after Pax6 and TBR2, marking the transition from intermediate progenitor cells to early neurons. It is mainly expressed in layer VI of the neocortex, which regulates cortical identity and connectivity genes. TBR1 also interacts with other transcriptional regulators to guide axon pathfinding and synaptic development. Its expression is tightly regulated during embryonic development, and TBR1 dysfunction has been linked to neurodevelopmental disorders such as autism spectrum disorder and intellectual disability. TBR1 is both a marker and a functional regulator of immature cortical neurons.

Figure 1. Immunohistochemistry (Frozen sections) - Anti-TBR1 antibody [EPR8138(2)] (ab183032).

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T-box brain protein 2 (TBR2)/EOMES

A transcription factor whose expression marks the transition from radial glia to intermediate progenitors. TBR2 is widely used as a precursor cell marker to identify transit amplifying precursor cells and to assess precursor cell proliferation in neurogenic regions^1-4.

Figure 2. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-TBR2 / Eomes antibody [EPR21950-241] (ab216870).

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MASH1

A transcription factor essential for neural differentiation. ASCL1 is expressed in multipotent precursor cells and multipotent stem cells, serving as a key marker for neural precursor cells in neurogenic niches. Please note that it can also label active neural stem cells^5-7.

Figure 3. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-MASH1/Achaete-scute homolog 1 antibody [EPR19840] (ab211327)

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Doublecortin (DCX)

Doublecortin (DCX) is a microtubule-associated protein and a well-established marker of immature neurons. It is expressed in neuronal precursor cells and young postmitotic neurons during embryonic development and in specific neurogenic regions of the adult brain, such as the subventricular zone and hippocampal dentate gyrus. DCX is involved in neuronal migration and cytoskeletal organisation, guiding the positioning of developing neurons. It is expressed in actively dividing progenitor cells. It continues for about 2-3 weeks as these cells mature into neurons, after which DCX is downregulated and replaced by mature neuronal markers like NeuN. Because of its temporally restricted expression, DCX is widely used in neurodevelopmental studies and adult neurogenesis research. Identifying neurogenic responses to stimuli such as injury or exercise is also useful. The specificity and timing of DCX expression make it a great tool to track immature neurons and study brain plasticity.

Figure 4. Immunohistochemistry (PFA perfusion fixed frozen sections) - Anti-Doublecortin antibody (ab18723).

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Beta III tubulin (TUBB3)

A class of tubulin whose expression is limited to neurons and is used to label immature neurons. Beta III tubulin is commonly used alongside mature neuronal markers to distinguish immature neurons from mature neurons and mature astrocytes^8,9.

Figure 5. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-beta III Tubulin antibody [2G10] - Neuronal Marker (ab78078).

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NeuroD1

A transcription factor that promotes neuronal development. NeuroD1 gene expression is commonly measured using TaqMan gene expression assays to assess target gene expression in neurogenesis studies, allowing for precise quantification of gene expression changes related to neuronal differentiation.

Figure 6. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-NeuroD1 antibody [EPR20766] (ab213725).

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Stathmin 1

A cytoplasmic phosphoprotein that is involved in cytoskeletal regulation. Stathmin 1 is also involved in cell division and is used as a cell proliferation marker in studies of neurogenesis and aging cells¹⁰.

Figure 7. Immunohistochemistry (Formalin/PFA-fixed paraffin-embedded sections) - Anti-Stathmin 1 antibody [EP1573Y] (ab52630).

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References

1. Englund, C. et al. Pax6, Tbr2, and Tbr1 are expressed sequentially by radial glia, intermediate progenitor cells, and postmitotic neurons in developing neocortex.  J. Neurosci.  25, 247–251 (2005).

2. Martí-Mengual, U. et al. Cells expressing markers of immature neurons in the amygdala of adult humans.  Eur. J. Neurosci.  37, 10–22 (2013).

3. Pollen, A. A. et al. Molecular identity of human outer radial glia during cortical development.  Cell  163, 55–67 (2015).

4. Shin, J. et al. Single-cell RNA-Seq with Waterfall reveals molecular cascades underlying adult neurogenesis.  Cell Stem Cell  17, 360–372 (2015).

5. Kim, E. J. et al. Ascl1 (Mash1) defines cells with long-term neurogenic potential in subgranular and subventricular zones in adult mouse brain.  PLoS One  6, e18472 (2011).

6. Kwak, M. et al. Effects of neonatal hypoxic-ischemic injury and hypothermic neuroprotection on neural progenitor cells in the mouse hippocampus.  Dev. Neurosci.  37, 428–439 (2015).

7. Shin, J. et al. Single-cell RNA-Seq with Waterfall reveals molecular cascades underlying adult neurogenesis.  Cell Stem Cell  17, 360–372 (2015).

8. Katsetos, C. D. et al. Class III beta-tubulin isotype (βIII) in the adrenal medulla: I. Localization in the developing human adrenal medulla.  Anat. Rec.  250, 335–343 (1998).

9. Menezes, J. R. & Luskin, M. B. Expression of neuron-specific tubulin defines a novel population in the proliferative layers of the developing telencephalon.  J. Neurosci.  14, 5399–5416 (1994).

10. Rubin, C. I. & Atweh, G. F. The role of stathmin in the regulation of the cell cycle.  J. Cell Biochem.  93, 242–250 (2004).