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Glaucomatous Optic Neuropathy Module

Neuroscience Module glaucoma_optic_neuropathy 6 disorders Pathograph 5
A conserved neurodegenerative module representing the final common pathway of glaucoma: impaired aqueous humor outflow raises intraocular pressure, which imposes mechanical and oxidative stress on the optic nerve head and drives progressive retinal ganglion cell apoptosis and optic nerve degeneration. Primary open-angle, angle-closure, exfoliation, and secondary glaucomas differ in the upstream cause of outflow obstruction but converge on this pressure-related retinal ganglion cell loss. Individual disorder entries declare conformance via conforms_to on their pathophysiology nodes, substituting the disorder-specific outflow lesion (trabecular ECM accumulation, exfoliation material deposition, angle closure, neovascular membrane) while preserving the conserved IOP-to-neurodegeneration chain.
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Pathophysiology Nodes

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5 shared nodes are defined in this module.
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Cell Types

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Retinal Ganglion Cell CL:0000740 Cell Ontology (CL) Relation: this mechanism module involves this cell type This mechanism module involves Retinal Ganglion Cell (CL:0000740). CL:0000740 is a cell type from the Cell Ontology.
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Biological Processes

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Trabecular ECM Organization GO:0030198 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves dysregulated Trabecular ECM Organization (GO:0030198). GO:0030198 is a biological process from the Gene Ontology. DYSREGULATED Neuron Apoptotic Process GO:0051402 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased Neuron Apoptotic Process (GO:0051402). GO:0051402 is a biological process from the Gene Ontology. INCREASED Neuroinflammatory Response GO:0150076 Gene Ontology (GO) Relation: this mechanism module involves this biological process This mechanism module involves increased Neuroinflammatory Response (GO:0150076). GO:0150076 is a biological process from the Gene Ontology. INCREASED
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Notes

This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "glaucoma_optic_neuropathy#Retinal Ganglion Cell Apoptosis"). Conforming nodes should substitute the disorder-specific cause of raised outflow resistance (juxtacanalicular ECM accumulation in POAG, pupillary block/angle closure in angle-closure glaucoma, fibrillar exfoliation material in exfoliation glaucoma, MYOC/trabecular gene defects in juvenile glaucoma). Normal-tension glaucoma is a partial exception in which RGC loss occurs at statistically normal IOP.
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Used By Disorder Entries

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Congenital Glaucoma via Trabeculodysgenesis and Congenital Outflow Obstruction → Trabecular Meshwork Outflow Dysfunction , Secondary Angle Obstruction in Anterior Segment Dysgenesis → Trabecular Meshwork Outflow Dysfunction , Congenital Intraocular Pressure Elevation → Elevated Intraocular Pressure , Retinal Ganglion Cell Loss → Retinal Ganglion Cell Apoptosis , Optic Nerve Head Degeneration and Glaucomatous Cupping → Optic Nerve Degeneration and Neuroinflammation , Childhood Visual Impairment and Blindness → Progressive Glaucomatous Optic Neuropathy
Glaucoma via Retinal Ganglion Cell Death → Retinal Ganglion Cell Apoptosis
Juvenile Open Angle Glaucoma via Trabecular Meshwork Immaturity and Outflow Obstruction → Trabecular Meshwork Outflow Dysfunction , Mutant Myocilin Misfolding and Trabecular Cell Stress → Trabecular Meshwork Outflow Dysfunction , Anterior-Segment / Trabecular Dysgenesis in CYP1B1-related Disease → Trabecular Meshwork Outflow Dysfunction , Pressure-Induced Glaucomatous Optic Neuropathy → Retinal Ganglion Cell Apoptosis
OPTN-related Open Angle Glaucoma via Retinal Ganglion Cell Apoptosis , Progressive Glaucomatous Optic Neuropathy at Normal Intraocular Pressure → Progressive Glaucomatous Optic Neuropathy
Pigment Dispersion Syndrome via Trabecular Meshwork Pigment Loading and Outflow Dysfunction → Trabecular Meshwork Outflow Dysfunction , Elevated Intraocular Pressure , Glaucomatous Optic Neuropathy → Progressive Glaucomatous Optic Neuropathy
Weill-Marchesani syndrome via Elevated Intraocular Pressure , Retinal Ganglion Cell Apoptosis , Optic Nerve Degeneration and Neuroinflammation , Progressive Glaucomatous Optic Neuropathy and Vision Loss → Progressive Glaucomatous Optic Neuropathy
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Pathograph

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Pathograph: causal mechanism network for Glaucomatous Optic Neuropathy Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

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Trabecular Meshwork Outflow Dysfunction
trigger
The trabecular meshwork in the iridocorneal angle is the principal drainage pathway for aqueous humor. Accumulation and reorganization of extracellular matrix in the juxtacanalicular tissue, loss of trabecular cellularity, and cytoskeletal stiffening increase resistance to aqueous outflow. This outflow dysfunction is the conserved initiating lesion across most glaucomas.
Trabecular ECM Organization GO:0030198 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves dysregulated Trabecular ECM Organization, annotated with extracellular matrix organization (GO:0030198). GO:0030198 is a biological process from the Gene Ontology. DYSREGULATED
Used by disorders
Congenital Glaucoma as Secondary Angle Obstruction in Anterior Segment Dysgenesis
Congenital Glaucoma as Trabeculodysgenesis and Congenital Outflow Obstruction
Juvenile Open Angle Glaucoma as Anterior-Segment / Trabecular Dysgenesis in CYP1B1-related Disease
Juvenile Open Angle Glaucoma as Mutant Myocilin Misfolding and Trabecular Cell Stress
Juvenile Open Angle Glaucoma as Trabecular Meshwork Immaturity and Outflow Obstruction
Pigment Dispersion Syndrome as Trabecular Meshwork Pigment Loading and Outflow Dysfunction
Downstream
  • Elevated Intraocular Pressure
Elevated Intraocular Pressure
amplifier
Increased resistance to aqueous humor drainage raises intraocular pressure. Elevated IOP is the principal modifiable risk factor for glaucoma and the proximate mechanical stressor transmitted to the optic nerve head and lamina cribrosa, where the retinal ganglion cell axons exit the eye.
Used by disorders
Congenital Glaucoma as Congenital Intraocular Pressure Elevation
Pigment Dispersion Syndrome
Weill-Marchesani syndrome
Downstream
  • Retinal Ganglion Cell Apoptosis
Retinal Ganglion Cell Apoptosis
central effector
Pressure-related mechanical stress at the optic nerve head, combined with oxidative stress, impaired axonal transport, and neurotrophin deprivation, triggers apoptosis of retinal ganglion cells. This is the central effector step of glaucomatous neurodegeneration and is shared across glaucoma subtypes.
Retinal Ganglion Cell CL:0000740 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves Retinal Ganglion Cell (CL:0000740). CL:0000740 is a cell type from the Cell Ontology.
Neuron Apoptotic Process GO:0051402 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased Neuron Apoptotic Process (GO:0051402). GO:0051402 is a biological process from the Gene Ontology. INCREASED
Used by disorders
Congenital Glaucoma as Retinal Ganglion Cell Loss
Glaucoma as Retinal Ganglion Cell Death
Juvenile Open Angle Glaucoma as Pressure-Induced Glaucomatous Optic Neuropathy
OPTN-related Open Angle Glaucoma
Weill-Marchesani syndrome
Downstream
  • Optic Nerve Degeneration and Neuroinflammation
Optic Nerve Degeneration and Neuroinflammation
effector
Progressive retinal ganglion cell loss is accompanied by optic nerve axon degeneration and a glial neuroinflammatory response that further accelerates neurodegeneration. Oxidative DNA damage accumulating in the degenerating tissue amplifies this neuroinflammatory drive.
Neuroinflammatory Response GO:0150076 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased Neuroinflammatory Response (GO:0150076). GO:0150076 is a biological process from the Gene Ontology. INCREASED
Used by disorders
Congenital Glaucoma as Optic Nerve Head Degeneration and Glaucomatous Cupping
Weill-Marchesani syndrome
Downstream
  • Progressive Glaucomatous Optic Neuropathy
Progressive Glaucomatous Optic Neuropathy
consequence
Cumulative retinal ganglion cell and axon loss produces the characteristic optic disc cupping, retinal nerve fiber layer thinning, and progressive, irreversible visual field loss that define glaucoma as a clinical entity.
Retinal Ganglion Cell CL:0000740 Cell Ontology (CL) Relation: this pathophysiological event involves this cell type This pathophysiological event involves Retinal Ganglion Cell (CL:0000740). CL:0000740 is a cell type from the Cell Ontology.
Neuron Apoptotic Process GO:0051402 Gene Ontology (GO) Relation: this pathophysiological event involves this biological process This pathophysiological event involves increased Neuron Apoptotic Process (GO:0051402). GO:0051402 is a biological process from the Gene Ontology. INCREASED
Used by disorders
Congenital Glaucoma as Childhood Visual Impairment and Blindness
OPTN-related Open Angle Glaucoma as Progressive Glaucomatous Optic Neuropathy at Normal Intraocular Pressure
Pigment Dispersion Syndrome as Glaucomatous Optic Neuropathy
Weill-Marchesani syndrome as Progressive Glaucomatous Optic Neuropathy and Vision Loss