Human-brain-cell-types

Brain organoid and iPSC-derived cell type characterization and comparison to primary human brain cell types. Includes organoid atlases, fidelity assessment, and maturation state analysis. | Gap: Organoid cell types diverge from in vivo counterparts in maturity and diversity; standardized organoid-to-primary comparison frameworks are missing.

Linking cell type identity (transcriptomic) to electrophysiological properties, morphology, and connectivity patterns. Includes Patch-seq, EM-connectomics, and functional characterization of cell-type-specific circuits. | Gap: Human Patch-seq data is extremely scarce; most connectivity-transcriptomics linking is from mouse; in vivo functional characterization of human cell types is nearly absent.

Mapping genetic disease risk (GWAS loci) to specific brain cell types using single-cell expression data. Includes MAGMA-cell, LDSC-SEG, and single-cell Mendelian randomization approaches for neuropsychiatric and neurodegenerative diseases. | Gap: Cell-type enrichment results vary across methods; fine-mapping to causal cell types is inconclusive; rare variant cell-type effects are largely unexplored.

Cell type-specific chromatin accessibility (scATAC-seq), DNA methylation, histone modifications, and 3D genome organization in human brain cell types. Includes regulatory element annotation and cell-type-specific enhancer-gene linking. | Gap: Cell-type-specific cis-regulatory element atlases are incomplete for human brain; variant-to-cell-type mapping for non-coding GWAS loci is sparse.

Detailed cell-type atlases for individual human brain regions: hippocampus, striatum, cerebellum, substantia nigra, thalamus, amygdala, hypothalamus. Includes region-specific cell types not found in neocortex. | Gap: Many subcortical regions (thalamus, hypothalamus, amygdala) lack comprehensive single-cell atlases in human; most data is from cortex and hippocampus.

Mapping cell types in their native spatial context using MERFISH, Slide-seq, Visium, STARmap, and other spatial platforms. Includes computational deconvolution and cell-type localization in brain tissue sections. | Gap: Whole-brain spatial coverage at single-cell resolution is missing for human; integration across spatial platforms is immature.

Identification of cell types selectively vulnerable in neurodegenerative (AD, PD, ALS, FTD) and neuropsychiatric diseases using single-cell approaches. Includes SEA-AD, cell-type-specific transcriptomic changes, and selective neuronal loss patterns. | Gap: Causal direction between cell-type vulnerability and disease onset is unclear; early-stage disease cell-type changes are undersampled.

Subclassification and functional characterization of astrocytes, oligodendrocytes, oligodendrocyte precursor cells (OPCs/NG2), and microglia in human brain. Includes region-specific glial diversity and disease-associated glial states. | Gap: Disease-associated microglia (DAM) vs homeostatic microglia states are debated; astrocyte functional subtypes are poorly mapped in humans.