Program: PROJECT STRANDSHIFT
Classification: Viral-Origin Attribution and Biological Signal Differentiation Framework
Primary Objective:
To accurately distinguish:
- Exogenous viral infection
- Endogenous retroviral activation (HERVs)
- Retrotransposon activation
- Viral mimicry biology
- DNA injury-induced antiviral signaling
- Laboratory contamination and artifact
within HTT-associated neurodegenerative disease, neuroimmune activation, and genomic instability states.
1. EXECUTIVE SUMMARY
One of the central scientific questions within PROJECT STRANDSHIFT is whether viral-like signatures detected in diseased tissues originate from:
- active viral infection
- latent viral reactivation
- endogenous retroelements
- DNA injury responses
- interferon signaling
- retrotransposon derepression
- apoptotic nucleic-acid release
The Viral-Origin Classifier (VOC) establishes a standardized evidence hierarchy to separate these biological states.
The classifier is specifically designed to prevent misclassification of:
- injured human DNA
- endogenous retroviral sequences
- viral mimicry signals
as true viral infection.
2. CLASSIFICATION ARCHITECTURE
Viral-Origin Categories
Category | Classification |
VOC-I | Confirmed Exogenous Virus |
VOC-II | Latent Viral Reactivation |
VOC-III | Endogenous Retroviral Activation |
VOC-IV | Retrotransposon Activation |
VOC-V | Viral Mimicry Biology |
VOC-VI | DNA Injury-Induced Antiviral State |
VOC-VII | Apoptotic Nucleic Acid Release |
VOC-VIII | Experimental Artifact / Contamination |
3. VOC-I — CONFIRMED EXOGENOUS VIRUS
Definition
Presence of an independently replicating viral organism.
Required Evidence
Viral Genome
Detected by:
- metagenomic sequencing
- viral capture sequencing
- PCR confirmation
AND
Replication Evidence
Detected by:
- viral transcripts
- viral proteins
- replication intermediates
AND
Independent Validation
Detected in:
- replicate samples
- orthogonal assay platforms
Examples
- HSV-1
- HSV-2
- EBV
- CMV
- HHV-6
- Influenza
- SARS-CoV-2
Classification Confidence
Highest
4. VOC-II — LATENT VIRAL REACTIVATION
Definition
Previously acquired virus reactivates from latency.
Evidence
Viral Genome Present
Viral Reactivation Transcripts
Episodic Viral Protein Expression
Examples
- EBV
- HSV
- CMV
- HHV-6
Biological Significance
Potential neuroimmune amplifier.
5. VOC-III — ENDOGENOUS RETROVIRAL ACTIVATION
Definition
Activation of endogenous retroviral elements encoded within the human genome.
Key Elements
HERV-K
HERV-W
HERV-H
HERV-Fc
Evidence
HERV RNA Expression
Detected by:
- RNA sequencing
- qPCR
HERV Protein Detection
Where applicable.
Epigenetic Derepression
Detected by:
- methylation profiling
- chromatin accessibility
Classification
Human-genome derived.
Not infectious virus.
6. VOC-IV — RETROTRANSPOSON ACTIVATION
Definition
Activation of mobile genetic elements.
Primary Targets
LINE-1
Alu Elements
SVA Elements
Evidence
- LINE-1 transcripts
- ORF1p expression
- ORF2p expression
- insertion signatures
Biological Interpretation
Genome instability marker.
Not viral infection.
7. VOC-V — VIRAL MIMICRY BIOLOGY
Definition
Cellular state resembling antiviral infection despite absence of virus.
Mechanisms
dsRNA Accumulation
Repeat RNA Expression
HERV Activation
Cytosolic DNA
Chromatin Derepression
Biomarkers
IFN-I Signature
OAS1
MX1
ISG15
IFIT1
IFIT3
Classification
Pseudo-viral state.
No virus required.
8. VOC-VI — DNA INJURY–INDUCED ANTIVIRAL STATE
Definition
DNA damage activates innate immune sensing pathways.
Triggers
Double-Strand Breaks
Micronuclei
Chromosomal Instability
Cytosolic DNA Leakage
Key Sensors
cGAS
STING
TBK1
IRF3
Evidence
DNA Damage Markers:
- γH2AX
- 53BP1
- ATM activation
Combined With:
- IFN activation
Without:
- detectable viral genome
Interpretation
Genome-stress response.
9. VOC-VII — APOPTOTIC NUCLEIC ACID RELEASE
Definition
Apoptosis generates extracellular DNA/RNA fragments.
Sources
Neuronal Death
Cellular Fragmentation
Apoptotic Bodies
Biomarkers
TUNEL
Caspase-3
Caspase-7
Cell-Free DNA
Cell-Free RNA
Interpretation
Cell death process.
Not viral replication.
10. VOC-VIII — EXPERIMENTAL ARTIFACT
Definition
False-positive viral signal.
Causes
Environmental Contamination
PCR Artifacts
Index Hopping
Sequencing Contamination
Alignment Errors
Reference Database Errors
Required Exclusion Criteria
Replicate validation.
Orthogonal confirmation.
Independent laboratory verification.
11. CLASSIFICATION DECISION TREE
Step 1
Is a viral genome present?
No
Proceed to Step 4.
Yes
Proceed to Step 2.
Step 2
Are replication markers present?
Yes
VOC-I
Confirmed Virus
No
Proceed to Step 3.
Step 3
Known latent virus?
Yes
VOC-II
Latent Reactivation
No
Further investigation required.
Step 4
HERV transcripts detected?
Yes
VOC-III
Endogenous Retroviral Activation
No
Proceed to Step 5.
Step 5
LINE-1 activation present?
Yes
VOC-IV
Retrotransposon Activation
No
Proceed to Step 6.
Step 6
Interferon signature present?
Yes
Proceed to Step 7.
No
Not viral-associated.
Step 7
DNA injury markers elevated?
Yes
VOC-VI
DNA Injury Antiviral State
No
VOC-V
Viral Mimicry Biology
12. STRANDSHIFT PRIORITY ASSAYS
Virome Detection
- Shotgun metagenomics
- Viral capture sequencing
- Long-read viral profiling
HERV Detection
- HERV RNA sequencing
- HERV qPCR
- HERV proteomics
Retrotransposon Detection
- LINE-1 RNA profiling
- ORF1p immunostaining
- ORF2p quantification
Viral Mimicry Panel
- IFN-I signature
- OAS1
- MX1
- ISG15
- IFIT family
DNA Injury Panel
- γH2AX
- 53BP1
- ATM
- ATR
- Comet assay
Apoptosis Panel
- Caspase-3
- Caspase-7
- Caspase-9
- TUNEL
- Cell-free DNA
13. STRANDSHIFT INTEGRATED VIRAL-ORIGIN SCORING SYSTEM
Exogenous Viral Score (EVS)
Measures:
- viral genome burden
- replication burden
- viral protein burden
HERV Activation Score (HAS)
Measures:
- HERV transcription
- HERV protein expression
- derepression state
Retrotransposon Activation Score (RAS)
Measures:
- LINE-1 activity
- insertion burden
- ORF expression
Viral Mimicry Score (VMS)
Measures:
- IFN activation
- dsRNA sensing
- antiviral-state markers
DNA Injury Antiviral Score (DIAS)
Measures:
- DNA breaks
- micronuclei
- cGAS-STING activation
14. STRANDSHIFT SCIENTIFIC POSITION
The Viral-Origin Classifier adopts the following interpretation hierarchy:
- Exogenous viruses require direct viral evidence.
- HERV activation is human-genome derived and not equivalent to viral infection.
- Retrotransposons represent endogenous genome mobility.
- Viral mimicry represents antiviral-like signaling without virus.
- DNA injury can generate antiviral-state biology through innate immune sensing.
- Injured HTT DNA is not classified as a virus.
- Apoptotic DNA fragments are not classified as viruses.
15. CONCLUSION
The Viral-Origin Classifier establishes a rigorous framework for distinguishing infectious viral biology from endogenous retroviral activation, retrotransposon activity, viral mimicry, DNA injury responses, and apoptotic nucleic-acid release.
Within PROJECT STRANDSHIFT, this classifier serves as the central analytical engine for determining whether viral-like signals originate from true pathogens, endogenous genomic elements, or genome-stress pathways associated with Huntington disease progression.