{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.heterokaryon","code":"thing-q441313","url":"https://ver.cy/models/thing/q441313/","name":"heterokaryon","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.OBJ"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A heterokaryon is a cell or continuous cytoplasmic compartment containing two or more genetically distinct nuclei that remain unfused.","purpose":"Enable an agent to recognize a heterokaryon, record the distinct nuclei sharing its cytoplasm, assess persistence of that state, and judge which observations or uses its evidence supports.","scope":{"in":["Evidence that distinct nuclear genotypes coexist within shared cytoplasm","Nuclear number, genotype proportions, ploidy and spatial arrangement","Contributing lineages and evidence for how heterokaryosis arose","Persistence, segregation, nuclear fusion and loss of the heterokaryotic state","Observed interactions between nuclear populations and their shared cellular phenotype"],"out":["Complete organism taxonomy, ecology and life history","Standalone models of donor strains, cell lines or isolated nuclei","Cell fusion procedures, equipment and experimental protocols","Complete sexual or parasexual life cycles","Mixed cultures or chimeric tissues whose different genotypes occupy separate cells","Single-nucleus hybrids as entities after the heterokaryotic state has ended"],"boundaries":[]},"distinguishingFeatures":["Demonstrate at least two genetically distinguishable nuclear populations; multiple nuclei alone do not distinguish a heterokaryon from a homokaryon.","Demonstrate shared cytoplasm rather than proximity of differently labeled cells in a mixed culture.","Resolve distinct nuclei rather than infer heterokaryosis from a heterozygous or polyploid single nucleus.","Record a dikaryotic organization separately: a paired two-nucleus arrangement is more specific than heterokaryosis and must not be assumed for every heterokaryon.","Require evidence of nuclear genetic difference rather than treating different nuclear sizes, expression states or organellar genomes as sufficient."],"structure":{"bundles":[{"id":"heterokaryon-identity","name":"Heterokaryon identity","description":"Establish whether the observed entity meets the nuclear and cytoplasmic criteria for heterokaryosis.","layers":[{"id":"distinct-nuclear-genotypes","name":"Distinct nuclear genotypes","description":"Assess evidence of genetic differences between separate nuclei.","findings":[{"id":"nuclear-genetic-distinction","name":"Nuclear genetic distinction","description":"Record the markers or sequence evidence assigning nuclei to distinguishable genotypes, including ambiguous assignments.","questions":[{"text":"Which evidence establishes that at least two separate nuclei differ genetically?","id":"nuclear-genetic-distinction-q01","kind":"definition"},{"text":"Could the observed difference instead reflect nuclear size, cell-cycle state, expression or labeling artifacts?","id":"nuclear-genetic-distinction-q02","kind":"boundary"}]}]},{"id":"shared-cytoplasmic-boundary","name":"Shared cytoplasmic boundary","description":"Identify the biological unit in which nuclear populations coexist.","findings":[{"id":"cytoplasmic-coexistence","name":"Cytoplasmic coexistence","description":"Record evidence of shared cytoplasm and the cell, compartment or network boundary to which the classification applies.","questions":[{"text":"What observation demonstrates shared cytoplasm rather than adjacent or overlapping cells?","id":"cytoplasmic-coexistence-q01","kind":"measurement"},{"text":"Does the heterokaryon designation apply to one compartment or a connected network, and what supports that boundary?","id":"cytoplasmic-coexistence-q02","kind":"boundary"}]}]}]},{"id":"nuclear-population-architecture","name":"Nuclear population architecture","description":"Represent the abundance, chromosome complement and distribution of constituent nuclei.","layers":[{"id":"nuclear-composition","name":"Nuclear composition","description":"Resolve numbers and genetic composition at the nuclear level.","findings":[{"id":"counts-ratios-and-ploidy","name":"Counts, ratios and ploidy","description":"Record total nuclei, genotype assignments and ploidy estimates with denominators, methods and uncertainty.","questions":[{"text":"How many nuclei were counted, and what fraction belongs to each distinguishable genotype?","id":"counts-ratios-and-ploidy-q01","kind":"measurement"},{"text":"What supports the ploidy assignment of each nuclear population independently of whole-cell DNA content?","id":"counts-ratios-and-ploidy-q02","kind":"measurement"}]}]},{"id":"nuclear-distribution","name":"Nuclear distribution","description":"Capture organization within the shared cytoplasmic unit.","findings":[{"id":"local-nuclear-arrangement","name":"Local nuclear arrangement","description":"Record pairing, intermingling or regional segregation without assuming uniform composition throughout a fungal network.","questions":[{"text":"How do nuclear genotype proportions and arrangements vary between sampled regions?","id":"local-nuclear-arrangement-q01","kind":"measurement"},{"text":"Is a dikaryotic organization demonstrated, or is only the broader heterokaryotic condition supported?","id":"local-nuclear-arrangement-q02","kind":"boundary"}]}]}]},{"id":"formation-and-lineage","name":"Formation and lineage","description":"Connect the observed nuclear populations to their origins and formation history.","layers":[{"id":"contributing-lineages","name":"Contributing lineages","description":"Associate recovered nuclear genotypes with documented biological contributors.","findings":[{"id":"nuclear-origin-attribution","name":"Nuclear origin attribution","description":"Link nuclear populations to strains, organisms or cell lines while preserving uncertain ancestry.","questions":[{"text":"Which contributor is supported for each nuclear genotype, and by what evidence?","id":"nuclear-origin-attribution-q01","kind":"provenance"},{"text":"Which recovered genotypes remain unassigned or inconsistent with the recorded contributors?","id":"nuclear-origin-attribution-q02","kind":"provenance"}]}]},{"id":"formation-evidence","name":"Formation evidence","description":"Separate observed formation events from inferred history.","findings":[{"id":"route-to-heterokaryosis","name":"Route to heterokaryosis","description":"Record the supported formation route and the earliest observation confirming distinct nuclei in shared cytoplasm.","questions":[{"text":"Was formation directly observed, experimentally induced or inferred from an already heterokaryotic specimen?","id":"route-to-heterokaryosis-q01","kind":"provenance"},{"text":"What distinguishes evidence of cytoplasmic fusion from evidence of subsequent nuclear fusion?","id":"route-to-heterokaryosis-q02","kind":"boundary"}]}]}]},{"id":"persistence-and-state-transitions","name":"Persistence and state transitions","description":"Track viability and retention or loss of distinct nuclear populations.","layers":[{"id":"coexistence-and-compatibility","name":"Coexistence and compatibility","description":"Record whether the combined entity remains viable under observed conditions.","findings":[{"id":"observed-coexistence-outcome","name":"Observed coexistence outcome","description":"Record viability, growth impairment and localized death without assigning incompatibility solely from failed growth.","questions":[{"text":"What viability or growth evidence is available for compartments containing both nuclear types?","id":"observed-coexistence-outcome-q01","kind":"measurement"},{"text":"What controls distinguish an incompatibility response from handling damage or unsuitable conditions?","id":"observed-coexistence-outcome-q02","kind":"boundary"}]}]},{"id":"retention-and-exit","name":"Retention and exit","description":"Identify temporal changes in nuclear composition and the end of the qualifying state.","findings":[{"id":"heterokaryotic-state-trajectory","name":"Heterokaryotic state trajectory","description":"Track persistence, loss of a nuclear type, nuclear fusion and descendants at the same explicitly defined spatial scale.","questions":[{"text":"Over what interval and conditions were distinct nuclear genotypes repeatedly demonstrated?","id":"heterokaryotic-state-trajectory-q01","kind":"measurement"},{"text":"What observation warrants reclassifying the entity or a descendant as no longer heterokaryotic?","id":"heterokaryotic-state-trajectory-q02","kind":"action"}]}]}]},{"id":"shared-cytoplasm-function","name":"Shared cytoplasm function","description":"Connect nuclear coexistence to measured cellular behavior and justified experimental interpretation.","layers":[{"id":"nuclear-contributions","name":"Nuclear contributions","description":"Distinguish cellular outcomes from activity attributable to individual nuclear populations.","findings":[{"id":"genotype-resolved-functional-evidence","name":"Genotype-resolved functional evidence","description":"Record expression or functional measurements with their nuclear attribution and contemporaneous nuclear proportions.","questions":[{"text":"Which measured activities can be assigned to a nuclear genotype rather than only to the combined entity?","id":"genotype-resolved-functional-evidence-q01","kind":"measurement"},{"text":"Could an apparent expression change be explained by a shift in nuclear proportions?","id":"genotype-resolved-functional-evidence-q02","kind":"boundary"}]}]},{"id":"interpretation-and-use","name":"Interpretation and use","description":"Determine which conclusions and applications the observed state supports.","findings":[{"id":"supported-functional-use","name":"Supported functional use","description":"Record evidence and controls needed to use the entity for complementation or nuclear regulation studies. Context: [heterokaryons in gene regulation](https://pubmed.ncbi.nlm.nih.gov/168148/).","questions":[{"text":"Which controls distinguish a shared-cytoplasm effect from donor carryover, selection or formation of a single-nucleus hybrid?","id":"supported-functional-use-q01","kind":"boundary"},{"text":"Which proposed observation or use remains justified by the current nuclear composition, viability and persistence evidence?","id":"supported-functional-use-q02","kind":"action"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of heterokaryon this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Describe a heterokaryon and how it differs from a dikaryon or hybrid cell, citing sources.","Report evidence, such as markers or microscopy, that a culture contains distinct unfused nuclei."],"mustNot":["Claim a culture is a heterokaryon without genetic or microscopic evidence.","Release engineered or pathogenic fungal heterokaryons outside containment.","Present cell-fusion experiments on human cells without stating ethical approvals.","Confuse heterokaryons with stable hybrids in reports."],"requiresHuman":["Releasing strains outside the laboratory.","Starting experiments that fuse human cells."]},"ethics":{"considerations":["Fusion experiments involving human cells raise questions of consent for donated material.","Fungal strains that combine traits can affect crops if released."],"affectedParties":["Cell donors","Farmers and ecosystems","Researchers"]},"owners":{"steward":"The laboratory or culture collection that holds the culture.","roles":[],"masterSystems":["Culture collection catalogues"]},"relations":[{"target":"Q5796041","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.heterokaryon","Wikidata: Q441313 (https://www.wikidata.org/wiki/Q441313)"]},"properties":{"applicability":"required","items":["Biological context: fungal cell or network; experimentally fused cell; other supported context","Cytoplasmic unit: identified cell, hyphal compartment or connected network with observation time","Nuclear genotype identities: links to genotype evidence and contributing lineages, with assignment confidence","Nuclear count: nuclei per defined cell, compartment or sampled volume","Nuclear genotype proportions: fraction or percentage of assigned nuclei per genotype, with denominator and uncertainty","Ploidy by nuclear population: haploid; diploid; polyploid; aneuploid; unresolved","Nuclear spatial organization: paired; intermingled; regionally segregated; other observed arrangement; unresolved","Heterokaryotic state: suspected; confirmed at observation; persistent over measured interval; lost; unresolved","Compatibility outcome: viable coexistence; growth impaired; compartment death; unresolved; not assessed","Observation interval: hours or days, or counted generations or passages with their definitions"]},"recognition":{"applicability":"required","items":["Seen under a microscope as cells or hyphae with nuclei of two or more types.","Distinct nuclei are told apart by genetic markers or fluorescent labels, not by shape."]},"capabilities":{"applicability":"required","items":["Classify a candidate as confirmed, suspected or unsupported heterokaryosis using nuclear identity and cytoplasmic continuity evidence.","Map nuclear genotypes and their proportions within a defined cell or fungal network.","Track whether distinct nuclear populations persist, segregate or undergo nuclear fusion.","Assess whether observed viability supports continued observation or use under an established organism-specific protocol.","Evaluate whether complementation or expression changes can be attributed to shared cytoplasm.","Link descendants or later hybrid states to the observed heterokaryon without assuming that they retain heterokaryosis."]},"hazards":{"applicability":"required","items":["Loss of one nucleus type over time giving misleading results.","Escape of strains with combined traits."]},"interfaces":{"applicability":"not-applicable","items":[]},"context":{"applicability":"required","items":["Heterokaryons occur in fungal biology and in research involving cells whose genetically distinct nuclei share a common cytoplasm.","Researchers study them to investigate interactions between nuclear genomes, cytoplasmic influences and gene expression.","Identifying the state requires evidence that the nuclei differ genetically and remain unfused within the same cytoplasmic compartment."]}},"sources":[{"title":"Wikidata item Q441313: heterokaryon","url":"https://www.wikidata.org/wiki/Q441313","note":"identity and sense of the item"},{"title":"Wikipedia: Heterokaryon","url":"https://en.wikipedia.org/wiki/Heterokaryon","note":"general description of the item"}],"openQuestions":["Does the registry intend the conventional genetically distinct-nuclei definition exclusively, or also specialized uses involving differentiated nuclear types such as ciliate nuclear dimorphism?","For septate fungal networks, what evidence of cytoplasmic connectivity is sufficient to assign heterokaryosis to the entire network rather than individual compartments?","What organism-specific duration and sampling criteria justify describing a heterokaryon as persistent or stable?","Which assays can distinguish nuclear genotype proportions from DNA-content, copy-number and cell-cycle effects in each intended biological context?","Does an existing Vercy model already own heterokaryon identity or the relevant dikaryon specialization, requiring a catalogue link instead of a separate publication?"],"resources":{"spec":"/models/things/publications/thing-q441313/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q441313/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:14:55Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"not-applicable","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:31+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.interfaces":"No universal standard or regulation applies specifically to the heterokaryon state independently of the organism and research context."},"score":1.0}}