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Sensorineural Hair Cell Loss Module

Module sensorineural_hair_cell_loss 1 disorder Pathograph 5
A conserved cochlear pathophysiology module representing the final common pathway to sensorineural hearing loss (HP:0000407; MONDO:0005365). Diverse initiating insults — hereditary defects of hair-cell stereocilia and mechanotransduction (e.g., MYO7A, stereociliary actin-core genes), defects of cochlear ionic homeostasis and gap-junction potassium recycling (GJB2/connexin 26), age-related (presbycusis), noise-induced, and ototoxic injury — converge on disruption of cochlear ionic homeostasis and oxidative stress, failure of hair-cell mechanotransduction, and apoptotic death of the non-regenerating mammalian cochlear hair cells. Hair-cell loss removes cochlear amplification and is followed by degeneration of spiral ganglion neurons, producing progressive, irreversible sensorineural hearing loss. Conforming disorder nodes substitute the disorder-specific primary lesion (stereocilia/MET gene defect, connexin/potassium-recycling defect, oxidative/metabolic insult, or ototoxic exposure) while preserving the conserved downstream 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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cochlear hair cell CL:0000855 spiral ganglion neuron CL:0000540
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Biological Processes

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sensory perception of sound GO:0007605 ABNORMAL detection of mechanical stimulus involved in sensory perception of sound GO:0050910 ABNORMAL potassium ion homeostasis GO:0055075 DYSREGULATED response to oxidative stress GO:0006979 INCREASED apoptotic process GO:0006915 INCREASED neuron apoptotic process GO:0051402 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., "sensorineural_hair_cell_loss#Hair Cell Mechanotransduction Failure and Death"). Conforming nodes should specialize the trigger to the disorder's primary lesion: hereditary nonsyndromic deafness substitutes a specific stereocilia/mechanotransduction gene (MYO7A, DIAPH1, etc.) or the GJB2/connexin 26 potassium-recycling defect; presbycusis and noise-induced loss substitute oxidative/metabolic injury; ototoxic loss substitutes the cytotoxic drug (cisplatin, aminoglycoside). Cell-type substitutions: cochlear inner hair cell (CL:0000589) and cochlear outer hair cell (CL:0000601) where the affected hair-cell subtype is known; spiral ganglion / auditory neurons map to neuron (CL:0000540).
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Used By Disorder Entries

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MYO6_Hearing_Loss via Stereocilia Dysfunction in Cochlear Hair Cells → Hair Cell Mechanotransduction Failure and Death
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Pathograph

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Pathograph: causal mechanism network for Sensorineural Hair Cell Loss Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

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Cochlear Sensory Epithelium Insult
trigger
A primary lesion of the cochlear sensory epithelium initiates the pathway. Across disorders this is a hereditary defect of hair-cell stereocilia or the mechanotransduction apparatus (e.g., stereociliary F-actin core or tip-link/MET-complex genes), a defect of cochlear ionic homeostasis such as GJB2/connexin 26 gap-junction loss, or an acquired metabolic, noise, or ototoxic insult. The mechanosensitive cochlear hair cell is the vulnerable target, and the downstream response converges regardless of the specific trigger.
cochlear hair cell CL:0000855
sensory perception of sound GO:0007605 ABNORMAL detection of mechanical stimulus involved in sensory perception of sound GO:0050910 ABNORMAL
Downstream
  • Cochlear Ionic Homeostasis Disruption and Oxidative Stress
Cochlear Ionic Homeostasis Disruption and Oxidative Stress
amplifier
The primary insult perturbs the cochlea's tightly regulated ionic environment and redox balance. Gap-junction (connexin) defects interrupt the potassium recycling pathway that maintains the endocochlear potential, while noise, aging, and ototoxic injury drive excess generation of reactive oxygen species. Loss of potassium homeostasis and accumulating oxidative stress together amplify injury to the sensory hair cells before overt cell death.
sensory hair cell CL:0000855
potassium ion homeostasis GO:0055075 DYSREGULATED response to oxidative stress GO:0006979 INCREASED
Downstream
  • Hair Cell Mechanotransduction Failure and Death
Hair Cell Mechanotransduction Failure and Death
central effector
Disrupted ionic homeostasis, oxidative stress, and mitochondrial and DNA damage cause hair-cell mechanotransduction to fail and trigger programmed cell death of the cochlear hair cells. Because mammalian cochlear hair cells do not regenerate, their apoptotic loss is the central, irreversible effector step that converts upstream injury into permanent sensory deficit.
cochlear hair cell CL:0000855
apoptotic process GO:0006915 INCREASED
Used by disorders
MYO6_Hearing_Loss as Stereocilia Dysfunction in Cochlear Hair Cells
Downstream
  • Cochlear Amplification Loss and Spiral Ganglion Neuron Degeneration
Cochlear Amplification Loss and Spiral Ganglion Neuron Degeneration
effector
Loss of hair cells and reduced endocochlear potential abolish active cochlear amplification, while deafferentation and ongoing injury drive progressive degeneration and apoptosis of the afferent spiral ganglion neurons that form the auditory nerve. This couples sensory-cell loss to failure of neural transmission of the auditory signal.
spiral ganglion neuron CL:0000540
neuron apoptotic process GO:0051402 INCREASED
Downstream
  • Progressive Sensorineural Hearing Loss
Progressive Sensorineural Hearing Loss
consequence
The combined irreversible loss of cochlear hair cells, cochlear amplification, and spiral ganglion neurons produces progressive, bilateral sensorineural hearing loss. Because the damaged cochlea does not regenerate, the deficit is permanent and current interventions are limited to prosthetic devices; this is the defining clinical consequence of the module.