Retinal Pigment Epithelium is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Retinal Pigment Epithelium is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
Mermaid diagram (expand to render)
Retinal Pigment Epithelium (RPE) are a specialized cell type classified within the Glial > Retinal pigment epithelium lineage. These cells are primarily found in Retina (choroid side) and are characterized by expression of marker genes including RPE65, BEST1, CRALBP (RLBP1), MERTK. They are selectively vulnerable in Age-related macular degeneration, Retinitis pigmentosa.
Morphology and Markers
Retinal Pigment Epithelium (RPE) are identified by the expression of the following key marker genes:
RPE65
BEST1
CRALBP (RLBP1)
MERTK
TYR
These markers are used for immunohistochemical identification and single-cell RNA sequencing classification, as catalogued in the [Allen Cell Type Atlas](https://portal.brain-map.org/atlases-and-data/rnaseq).
Normal Function
Retinal Pigment Epithelium (RPE) play essential roles in neural circuits and brain function. They are found in the following brain regions:
Retina (choroid side)
Their normal functions include maintaining neural circuit integrity, signal processing, and contributing to the homeostasis of their local microenvironment.
Vulnerability in Disease
Retinal Pigment Epithelium (RPE) show selective vulnerability in the following neurodegenerative conditions:
Age-related macular degeneration
Retinitis pigmentosa
The selective vulnerability of these cells is an active area of research, with factors including metabolic demands, calcium handling, exposure to toxic protein aggregates, and cell-autonomous gene expression programs contributing to their susceptibility.
Transcriptomic Profile
Single-cell and single-nucleus RNA sequencing studies have revealed the transcriptomic signature of Retinal Pigment Epithelium (RPE). Key differentially expressed genes from the Allen Cell Type Atlas and related datasets include the marker genes listed above. These transcriptomic profiles help identify subtypes and disease-associated gene expression changes.
Key Publications
[RPE dysfunction in age-related macular degeneration](https://doi.org/10.1038/s41583-021-00453-7). Nat Rev Neurosci, 2021.
External Links
Allen Cell Type Atlas: [https://portal.brain-map.org/atlases-and-data/rnaseq](https://portal.brain-map.org/atlases-and-data/rnaseq)
Allen Human Brain Atlas: [https://human.brain-map.org/](https://human.brain-map.org/)
[Cell Types Index](/cell-types)
[Genes Index](/genes)
[Diseases Index](/diseases)
[Mechanisms Index](/mechanisms)
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Background
The study of Retinal Pigment Epithelium has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
Structure
Cellular Features
Single layer of hexagonal cells: Tight junctions between cells
Melanin granules: Light absorption and photoprotection