Viral Neural Progenitor Cytopathy Module

Infectious disease Neuroscience Developmental biology Module viral_neural_progenitor_cytopathy 1 disorder Pathograph 5

Conserved non-genetic cortical malformation mechanism in which prenatal neurotropic viral infection targets neural stem cells, neural progenitors, or radial glia during corticogenesis. The shared skeleton is fetal-brain viral exposure and progenitor infection followed by antiviral innate immune activation, mitotic or centrosome stress, apoptosis or cytopathy, depletion or premature differentiation of the progenitor pool, impaired neurogenesis, and congenital cortical malformation. Zika virus is the prototype evidence base, but conforming disease entries should substitute the virus-specific receptor, immune-evasion, placental, diagnostic, and systemic branches.

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Pathophysiology Nodes

5 shared nodes are defined in this module.

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Cell Types

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Biological Processes

viral entry into host cell GO:0046718 ↑ INCREASED viral genome replication GO:0019079 ↑ INCREASED innate immune response GO:0045087 ↑ INCREASED defense response to virus GO:0051607 ↕ DYSREGULATED toll-like receptor signaling pathway GO:0002224 ↑ INCREASED type I interferon-mediated signaling pathway GO:0060337 ↕ DYSREGULATED cell cycle GO:0007049 ↕ DYSREGULATED mitotic cell cycle GO:0000278 ↕ DYSREGULATED mitotic spindle organization GO:0007052 ↕ DYSREGULATED apoptotic process GO:0006915 ↑ INCREASED cell population proliferation GO:0008283 ↓ DECREASED neurogenesis GO:0022008 ↓ DECREASED cerebral cortex development GO:0021987 ⚠ ABNORMAL

Notes

This is a mechanism module, not a broad TORCH, microcephaly, or congenital Zika syndrome disease entry. Use conforms_to only when the entry has evidence that a prenatal viral infection directly perturbs neural stem/progenitor or radial-glial biology. ZIKV-specific features such as AXL candidate entry receptor status, NS5/TBK1 immune evasion, calcifications, fetal diagnostic findings, ocular/systemic congenital findings, and antiviral response belong in the congenital Zika disease entry unless a later curator demonstrates that the branch is reusable across multiple congenital viral infections. This module intentionally overlaps downstream with neural_progenitor_centrosome_spindle_dysfunction for mitotic/centrosome and progenitor-pool branches; conforming disease entries can cite both modules when the evidence supports both the viral upstream lesion and the conserved progenitor-spindle/progenitor-pool skeleton.

Mechanistic Hypotheses

Viral Neural Progenitor Cytopathy Model

viral_progenitor_cytopathy_model CANONICAL Evidence: 3

Evidence balance 3 support

Prenatal neurotropic virus reaches the developing fetal brain and infects neural stem cells, neural progenitors, or radial glia. Infection activates antiviral innate immune pathways and can directly disrupt cell-cycle, mitotic, centrosome, or phospho-TBK1 localization machinery. The combined viral replication, innate immune, and mitotic stress state increases apoptosis or premature differentiation, depletes the progenitor pool, and impairs neurogenesis, producing cortical thinning, microcephaly, simplified gyration, or other congenital cortical malformations.

Discussions and Knowledge Gaps

Which viral entry receptors or attachment factors determine susceptibility of human radial glia, outer radial glia, neural progenitors, endothelium, and fetal barrier tissues to congenital viral infection?

KNOWLEDGE GAP OPEN gap_viral_entry_receptor_tropism

Attached to: Fetal Brain Viral Exposure and Progenitor Infection

AXL expression highlights a plausible ZIKV susceptibility branch in human radial glia and organoids, but AXL is not established here as a required generic viral-module feature. Disease entries should decide whether their virus uses AXL, another TAM receptor, a distinct attachment factor, or a receptor-independent route, and whether receptor expression alone explains fetal-brain tropism.

Proposed experiments: Isogenic fetal-brain receptor and viral-strain tropism panel

Which congenital viral cortical-malformation mechanisms are faithfully captured by mouse, non-human primate organoid, human organoid, fetal slice, and postmortem human tissue systems, and which are model- or strain-specific?

HUMAN MODEL MISMATCH OPEN gap_viral_mcd_human_model_translatability

Attached to: Fetal Brain Viral Exposure and Progenitor Infection Neural Progenitor Apoptosis and Pool Depletion Impaired Neurogenesis and Congenital Cortical Malformation

The ZIKV evidence base spans hNPC culture, brain organoids, organotypic fetal slices, mouse models, and infected human fetal brain, but each system captures different aspects of gestational timing, placental crossing, immune competence, OSVZ/oRG biology, and strain-specific viral adaptation. Conforming disease entries should not treat one model as complete proof of the human congenital cortical malformation skeleton.

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Used By Disorder Entries

Congenital Zika Syndrome via Neurotropic Entry into Fetal Neural Progenitors → Fetal Brain Viral Exposure and Progenitor Infection , Antiviral Innate Immune Activation , Viral Mitotic and Centrosome Cytopathy , Neural Progenitor Apoptosis and Pool Depletion , Impaired Neurogenesis and Congenital Cortical Malformation

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Pathograph

Use the checkboxes to hide or show graph categories. Hover nodes for evidence-backed metadata.

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Pathophysiology

Fetal Brain Viral Exposure and Progenitor Infection

trigger

A prenatal neurotropic virus crosses maternal-fetal or fetal-brain barriers and infects neural stem cells, neural progenitors, radial glia, or related fetal neuroepithelial cells. ZIKV data support this node through human iPSC-derived neural progenitor infection, human cortical progenitor and organoid infection, and fetal tissue/radial-glial susceptibility evidence. Virus-specific receptor and placental entry details belong in conforming disease entries.

neural stem cell CL:0000047 neural progenitor cell CL:0011020 radial glial cell CL:0000681

viral entry into host cell GO:0046718 ↑ INCREASED viral genome replication GO:0019079 ↑ INCREASED

Used by disorders

Congenital Zika Syndrome as Neurotropic Entry into Fetal Neural Progenitors

Downstream

Antiviral Innate Immune Activation Infection exposes viral RNA or replication intermediates that activate pattern-recognition and interferon-related pathways in neural progenitor systems.
Viral Mitotic and Centrosome Cytopathy Viral infection can directly perturb mitosis, centrosomes, and radial glial cell-cycle machinery.

Show evidence (3 references)

PMID:26952870 SUPPORT In Vitro

"Our results identify hNPCs as a direct ZIKV target."

Human iPSC-derived cortical neural progenitors are direct ZIKV targets, supporting the trigger node.

PMID:27038591 SUPPORT Computational

"Here we report that the candidate ZIKV receptor, AXL, is highly enriched in radial glia, the neural stem cells of the human fetal cerebral cortex, providing a hypothesis for why these cells are particularly vulnerable to ZIKV infection, and providing a candidate mechanism for ZIKV-induced microcephaly."

Supports radial glia and AXL-enriched fetal cortical cells as a susceptibility branch for the ZIKV prototype of this module.

PMID:27279226 SUPPORT In Vitro

"the virus infects human cortical progenitor cells, leading to an increase in cell death."

ZIKV(BR) infection of human cortical progenitors supports the generic fetal-brain progenitor infection trigger.

Antiviral Innate Immune Activation

amplifier

Viral infection activates innate immune pathways in neural progenitor systems. In the ZIKV prototype, cerebral organoid studies support a TLR3-linked branch in which antiviral signaling intersects with neurogenesis, axon guidance, and apoptosis pathways. This node should be specialized in disease entries for the relevant pattern-recognition receptor, interferon pathway, viral immune-evasion factor, or host restriction mechanism.

neural progenitor cell CL:0011020 radial glial cell CL:0000681

innate immune response GO:0045087 ↑ INCREASED defense response to virus GO:0051607 ↕ DYSREGULATED toll-like receptor signaling pathway GO:0002224 ↑ INCREASED type I interferon-mediated signaling pathway GO:0060337 ↕ DYSREGULATED

Used by disorders

Congenital Zika Syndrome

Downstream

Neural Progenitor Apoptosis and Pool Depletion Innate immune signaling and viral stress can promote apoptosis, premature differentiation, or survival loss in the progenitor pool.

Show evidence (3 references)

PMID:27162029 SUPPORT In Vitro

"Here we show that cerebral organoids generated from human embryonic stem cells mimic the developing fetal brain and develop malformations and severely inhibited growth following ZIKV inoculation."

Human cerebral organoids model fetal-brain malformation and growth inhibition after viral exposure.

PMID:27162029 SUPPORT In Vitro

"Altogether, these data suggest that ZIKV perturbs a TLR3 regulated network controlling neurogenesis and apoptotic pathways (Figure 4H)."

Supports TLR3-linked innate immune signaling as an amplifier of progenitor cytopathy and neurogenesis defects.

PMID:27568284 SUPPORT In Vitro

"ZIKV infection of NES cells and RGCs causes centrosomal depletion and mitochondrial sequestration of phospho-TBK1 during mitosis."

Links viral infection to TBK1 relocalization at the interface of innate immune signaling and mitotic disruption in human neuroepithelial stem cells and radial glia.

Viral Mitotic and Centrosome Cytopathy

central effector

Viral infection perturbs cell-cycle progression, mitosis, centrosome integrity, spindle geometry, or centrosome-associated antiviral signaling in infected neural stem/progenitor cells and radial glia. This node is the point of convergence with the neural progenitor centrosome/spindle dysfunction module.

neural progenitor cell CL:0011020 radial glial cell CL:0000681

cell cycle GO:0007049 ↕ DYSREGULATED mitotic cell cycle GO:0000278 ↕ DYSREGULATED mitotic spindle organization GO:0007052 ↕ DYSREGULATED

Used by disorders

Congenital Zika Syndrome

Downstream

Neural Progenitor Apoptosis and Pool Depletion Cell-cycle, mitotic, and centrosome disruption promotes apoptosis, premature differentiation, or loss of the neural progenitor pool.

Show evidence (3 references)

PMID:26952870 SUPPORT In Vitro

"ZIKV infection increases cell death and dysregulates cell-cycle progression, resulting in attenuated hNPC growth."

Directly supports cell-cycle dysregulation and growth attenuation in infected human neural progenitor cells.

PMID:27568284 SUPPORT In Vitro

"we show that ZIKV infects both neocortical and spinal NES cells as well as their fetal homolog, radial glial cells (RGCs), causing disrupted mitoses, supernumerary centrosomes, structural disorganization, and cell death."

Supports mitotic and centrosome cytopathy in human neuroepithelial stem cells and radial glia.

PMID:28132835 SUPPORT In Vitro

"The main phenotypic effect was premature differentiation of neural progenitors associated with centrosome perturbation, even during early stages of infection, leading to progenitor depletion, disruption of the VZ, impaired neurogenesis, and cortical thinning."

Human brain organoid evidence supports centrosome perturbation as an early viral cytopathy mechanism that depletes progenitors.

Neural Progenitor Apoptosis and Pool Depletion

effector

Viral replication, innate immune activation, and mitotic stress converge on increased apoptosis, cell death, premature differentiation, or reduced viability of neural progenitors and radial glia. The resulting depletion or distortion of the progenitor pool reduces cortical neuron output and disrupts the ventricular-zone scaffold.

neural stem cell CL:0000047 neural progenitor cell CL:0011020 radial glial cell CL:0000681

apoptotic process GO:0006915 ↑ INCREASED cell population proliferation GO:0008283 ↓ DECREASED neurogenesis GO:0022008 ↓ DECREASED

Used by disorders

Congenital Zika Syndrome

Downstream

Impaired Neurogenesis and Congenital Cortical Malformation Progenitor loss and premature differentiation reduce cortical neuron output and disrupt early cortical architecture.

Show evidence (3 references)

PMID:27064148 SUPPORT In Vitro

"Using immunocytochemistry and electron microscopy, we showed that ZIKV targets human brain cells, reducing their viability and growth as neurospheres and brain organoids."

Supports reduced viability and growth in human neurosphere and brain organoid models after ZIKV infection.

PMID:27279226 SUPPORT In Vitro

"the number of apoptotic cells (cleavage Caspase 3- and TUNEL-positive cells) was increased in organoids infected with ZIKVBR, possibly explaining the decrease in the NPC population (Fig. 3i and Extended Data Fig. 5g–h)."

ZIKV(BR)-infected human brain organoids show increased apoptosis and a reduced NPC population, supporting this effector node.

PMID:27162029 SUPPORT In Vitro

"Taken together, these results demonstrate that ZIKV abrogates neurodevelopment by targeting the neural progenitor population."

Supports neural progenitor targeting as a contributor to viral neurodevelopmental disruption in human cerebral organoids.

Impaired Neurogenesis and Congenital Cortical Malformation

outcome

Reduced progenitor survival, premature progenitor differentiation, disrupted ventricular-zone organization, and impaired neurogenesis produce congenital cortical malformations. ZIKV prototype outcomes include cortical thinning, microcephaly, simplified gyration or agyria-like malformation, and disrupted cortical layers; virus-specific imaging findings and extracortical/systemic congenital features belong in conforming disease entries.

neuron CL:0000540

neurogenesis GO:0022008 ↓ DECREASED cerebral cortex development GO:0021987 ⚠ ABNORMAL

Used by disorders

Congenital Zika Syndrome

Show evidence (3 references)

PMID:27064148 SUPPORT In Vitro

"These results suggest that ZIKV abrogates neurogenesis during human brain development."

Human neurosphere and brain organoid evidence supports impaired neurogenesis as the downstream developmental output.

PMID:27279226 SUPPORT Model Organism

"Here we demonstrate that ZIKV(BR) infects fetuses, causing intrauterine growth restriction, including signs of microcephaly, in mice."

Mouse fetal exposure evidence supports congenital growth and microcephaly outcomes, while the human/model limitations remain captured in the module's HUMAN_MODEL_MISMATCH discussion.

PMID:27279226 SUPPORT In Vitro

"We also report that the infection of human brain organoids results in a reduction of proliferative zones and disrupted cortical layers."

Human brain organoid evidence connects viral infection to reduced proliferative zones and disrupted cortical layer organization.