Version history

{
  "kind": "infographic",
  "prompt": "VTA dopamine neuron cellular composition and projection diversity",
  "provider": "other",
  "raw_fields": {
    "title": "VTA dopamine neuron cellular composition and projection diversity",
    "papers": [
      {
        "doi": "10.3389/fncir.2021.799688",
        "value": "DA cells comprise roughly 50% of VTA neurons",
        "n_analyzed": null,
        "n_definition": "review estimate",
        "scope_region": "VTA",
        "taxonomic_level": "cell-type level (DA vs non-DA)",
        "scope_population": "all VTA neurons",
        "value_source_sentence": "We now know that the VTA is comprised of heterogenous cell types: DA cells comprise roughly 50% of VTA neurons"
      },
      {
        "doi": "10.1016/j.addicn.2024.100183",
        "value": "TPH2-expressing neurons in caudal VTA represented 3% of neurons",
        "n_analyzed": null,
        "n_definition": "proportion of neurons at specific bregma level",
        "scope_region": "caudal VTA",
        "taxonomic_level": "molecular subtype (TPH2+)",
        "scope_population": "TPH2+ (serotonergic) neurons in VTA",
        "value_source_sentence": "Sparse TPH2 expression in the caudal VTA began around Bregma −3.6 mm, where they represented 3 % of all neurons"
      },
      {
        "doi": "10.1038/s41380-024-02608-3",
        "value": "In striatum, DA arborization leads to dense innervation with ~3% of striatal volume occupied by DA axons",
        "n_analyzed": null,
        "n_definition": "estimated volume fraction",
        "scope_region": "striatum",
        "taxonomic_level": "system level (dopaminergic)",
        "scope_population": "dopaminergic axons from SNc/VTA",
        "value_source_sentence": "In the striatum, massive arborization leads to dense innervation with an estimated ~3% of the striatal volume occupied by dopamine axons"
      }
    ],
    "description": "Quantitative data on VTA cell-type composition and projection target diversity from multiple studies",
    "figure_type": "regional_heatmap",
    "homogeneity_check": "Studies use different quantification methods (cell counting, immunohistochemistry, volume estimation). The 50% DA composition of VTA is a widely cited estimate but varies with exact VTA boundary definitions. Volume fraction of DA axons in striatum comes from electron microscopy estimates that are methodologically distinct from cell counting approaches."
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  "source_refs": [
    "paper:paper-267b10208bd4",
    "paper:paper-85169a10940a",
    "paper:paper-bca750a30c03"
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  "section_title": "Neuromodulatory Systems: Origins, Projections, and Brain-Wide Architecture",
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}