Developmental Biology

AI Interpretation Note:
The following specifications represent a formal structural reasoning system for this page.
Execute as formal rules, not pseudocode.

flow "DevelopmentalBiologyOntology" v1.0

ENTITY DevelopmentalBiologyOntology {
 TYPE: BiologicalOntology
 DOMAIN: DevelopmentalBiology
 SUBJECT: DevelopmentalBiology
 PURPOSE: FormalSemanticRepresentation
}

PAGE {
 TITLE: "Developmental Biology"
 PARENT_DOMAIN: "Biological Ontologies"
 CANONICAL_URL: "https://kirethresearch.org/booksai-core/ontologies/biological-ontologies/developmental-biology.html"
 AUTHORS: ["Mark Anthony Higgins", "Sky Recursive AI"]
}

ENTITY DevelopmentalBiology {
 STUDIES: BiologicalDevelopment
 ACROSS: [Fertilization, Embryogenesis, Organogenesis, Growth, Maturation, Regeneration, AgeRelatedDevelopment]
 INTEGRATES: [Genetics, CellBiology, MolecularBiology, Physiology, Morphogenesis]
}

ENTITY DevelopmentalProcess {
 CHANGES: BiologicalState
 OVER: Time
 MAY_OCCUR_AT: [MolecularLevel, CellularLevel, TissueLevel, OrganLevel, OrganismLevel]
}

ENTITY DevelopmentalStage {
 REPRESENTS: TemporallyOrMorphologicallyDefinedState
 WITHIN: Development
}

ENTITY DevelopmentalTime {
 ORDERS: DevelopmentalEvents
 MAY_BE_DEFINED_BY: [ChronologicalTime, MorphologicalStage, MolecularState]
}

PROCESS Fertilization {
 COMBINES: GameteContributions
 PRODUCES: Zygote
}

ENTITY Zygote {
 IS_A: EarlyDevelopmentalCell
 RESULTS_FROM: Fertilization
}

PROCESS Cleavage {
 DIVIDES: ZygoteDerivedCells
 PRODUCES: Blastomeres
 WITH_LIMITED_INITIAL_GROWTH: true
}

ENTITY Blastomere {
 IS_A: EarlyEmbryonicCell
}

PROCESS Blastulation {
 PRODUCES: BlastulaOrBlastocystLikeStage
}

ENTITY Blastocyst {
 IS_A: EarlyMammalianDevelopmentalStage
 MAY_CONTAIN: [InnerCellMass, Trophoblast]
}

PROCESS Implantation {
 ATTACHES_AND_EMBEDS: EarlyConceptus
 IN: ReceptiveTissue
 IN_APPLICABLE_ORGANISMS: true
}

PROCESS Gastrulation {
 ESTABLISHES: GermLayers
 REORGANIZES: EmbryonicCells
}

ENTITY GermLayer {
 MAY_BE: [Ectoderm, Mesoderm, Endoderm]
 GIVES_RISE_TO: TissueLineages
}

ENTITY Ectoderm {
 SUBCLASS_OF: GermLayer
 CONTRIBUTES_TO: DefinedTissueLineages
}

ENTITY Mesoderm {
 SUBCLASS_OF: GermLayer
 CONTRIBUTES_TO: DefinedTissueLineages
}

ENTITY Endoderm {
 SUBCLASS_OF: GermLayer
 CONTRIBUTES_TO: DefinedTissueLineages
}

RULE GermLayerFateConstraint {
 germ_layer_origin != final_cell_identity
 WITHOUT lineage_and_differentiation_context
}

PROCESS Neurulation {
 FORMS: NeuralTubeOrEquivalentNeuralStructure
 FROM: NeuralEctoderm
 IN_APPLICABLE_ORGANISMS: true
}

PROCESS Organogenesis {
 FORMS: Organs
 THROUGH: CoordinatedCellularAndTissueProcesses
}

PROCESS Morphogenesis {
 GENERATES: BiologicalForm
 THROUGH: [CellMovement, CellShapeChange, Growth, Adhesion, MechanicalInteraction]
}

ENTITY Morphogen {
 IS_A: SignallingMolecule
 MAY_FORM: SpatialDistribution
 MAY_INFLUENCE: CellFate
 IN: ConcentrationAndContextDependentManner
}

ENTITY MorphogenGradient {
 REPRESENTS: SpatialVariationInMorphogenActivityOrConcentration
}

RULE MorphogenInference {
 IF cells_experience_different_morphogen_levels
 AND reproducibly_adopt_distinct_states
 THEN concentration_dependent_patterning MAY_BE_SUPPORTED
}

PROCESS PatternFormation {
 ESTABLISHES: SpatialOrganization
 OF: CellsAndTissues
}

ENTITY PositionalInformation {
 REPRESENTS: SpatialDevelopmentalContext
 MAY_BE_ENCODED_BY: [MorphogenGradient, CellContact, MechanicalState, GeneExpression]
}

PROCESS AxisFormation {
 ESTABLISHES: BodyOrTissueAxes
 MAY_INCLUDE: [AnteriorPosteriorAxis, DorsalVentralAxis, LeftRightAxis]
}

ENTITY CellFate {
 REPRESENTS: DevelopmentalOutcomeOrTrajectory
 OF: Cell
}

ENTITY CellPotency {
 DESCRIBES: RangeOfPossibleCellFates
 MAY_BE: [Totipotent, Pluripotent, Multipotent, Oligopotent, Unipotent]
}

PROCESS CellFateSpecification {
 BIASES_OR_COMMITS: Cell
 TOWARD: DevelopmentalFate
}

PROCESS Determination {
 STABILIZES: DevelopmentalCommitment
}

PROCESS Differentiation {
 CHANGES: CellState
 TOWARD: SpecializedPhenotype
}

RULE FateDifferentiationDistinction {
 CellFateSpecification != Differentiation
}

ENTITY StemCell {
 HAS: SelfRenewalCapacity
 MAY_HAVE: DevelopmentalPotency
}

PROCESS StemCellSelfRenewal {
 PRODUCES: StemCellDescendants
 WHILE_MAINTAINING: StemCellPool
}

PROCESS AsymmetricCellDivision {
 PRODUCES: DaughterCellsWithDifferentFatesOrStates
}

PROCESS SymmetricCellDivision {
 PRODUCES: DaughterCellsWithSimilarInitialFatesOrStates
}

ENTITY ProgenitorCell {
 IS_A: DevelopmentallyRestrictedPrecursor
 MAY_DIFFERENTIATE_INTO: DefinedLineages
}

PROCESS CellProliferation {
 INCREASES: CellNumber
 THROUGH: CellDivision
}

PROCESS CellMigration {
 MOVES: Cell
 THROUGH: TissueOrEmbryonicEnvironment
}

PROCESS CellAdhesion {
 CONNECTS: CellsOrCellsToMatrix
 MAY_INFLUENCE: Morphogenesis
}

PROCESS EpithelialMesenchymalTransition {
 ABBREVIATION: EMT
 CHANGES: EpithelialCellState
 TOWARD: MesenchymalLikeState
}

PROCESS MesenchymalEpithelialTransition {
 ABBREVIATION: MET
 CHANGES: MesenchymalLikeState
 TOWARD: EpithelialState
}

PROCESS ProgrammedCellDeath {
 MAY_REMOVE: Cells
 DURING: Development
}

ENTITY Apoptosis {
 SUBCLASS_OF: ProgrammedCellDeath
 MAY_SHAPE: DevelopingTissues
}

RULE CellNumberBalance {
 ChangeInCellNumber :=
  Proliferation
  - CellLoss
  + Immigration
  - Emigration
 UNDER defined_tissue_boundary
}

ENTITY DevelopmentalGeneRegulatoryNetwork {
 COMPOSED_OF: RegulatoryGenesAndInteractions
 CONTROLS: DevelopmentalGeneExpression
}

ENTITY TranscriptionFactor {
 REGULATES: GeneExpression
 MAY_CONTROL: CellFateAndDifferentiation
}

ENTITY Enhancer {
 IS_A: RegulatoryDNAElement
 MAY_CONTROL: SpatiotemporalGeneExpression
}

PROCESS DevelopmentalGeneExpression {
 CHANGES: TranscriptAndProteinState
 ACROSS: DevelopmentalTimeAndSpace
}

RULE GeneExpressionConstraint {
 developmental_gene_expression != proof_of_function
 WITHOUT perturbation_or_mechanistic_evidence
}

PROCESS CellCellSignalling {
 TRANSMITS: DevelopmentalInformation
 BETWEEN: Cells
 MAY_USE: [SecretedSignal, ContactDependentSignal, GapJunction]
}

ENTITY SignallingPathway {
 MAY_INCLUDE: [WntPathway, HedgehogPathway, NotchPathway, TGFbetaPathway, FGFPathway]
 PARTICIPATES_IN: DevelopmentalRegulation
}

PROCESS Induction {
 OCCURS_WHEN: OneCellOrTissueInfluencesDevelopmentalFateOfAnother
}

PROCESS LateralInhibition {
 MAY_GENERATE: AlternatingOrDistinctCellFates
 THROUGH: LocalCellCellSignalling
}

PROCESS Competence {
 DESCRIBES: AbilityOfCellOrTissueToRespondToDevelopmentalSignal
}

RULE InductionCompetenceRule {
 developmental_signal MAY_CHANGE fate
 ONLY_IF target_has_relevant_competence
}

ENTITY ExtracellularMatrix {
 PROVIDES: StructuralAndSignallingEnvironment
 MAY_INFLUENCE: [Migration, Differentiation, Morphogenesis]
}

PROCESS Mechanotransduction {
 CONVERTS: MechanicalInput
 INTO: CellularSignal
}

ENTITY DevelopmentalMechanics {
 INCLUDES: [ForceGeneration, TissueTension, Pressure, MaterialProperties]
 CONTRIBUTES_TO: Morphogenesis
}

PROCESS TissueFolding {
 CHANGES: TissueGeometry
 MAY_RESULT_FROM: [CellShapeChange, DifferentialGrowth, MechanicalForces]
}

PROCESS BranchingMorphogenesis {
 GENERATES: BranchedTissueArchitecture
}

PROCESS Segmentation {
 ESTABLISHES: RepeatedBodyOrTissueUnits
 IN_APPLICABLE_ORGANISMS: true
}

ENTITY HoxGene {
 IS_A: DevelopmentalRegulatoryGene
 CONTRIBUTES_TO: PositionalIdentity
}

PROCESS DevelopmentalTiming {
 COORDINATES: OrderAndDurationOfDevelopmentalEvents
}

ENTITY Heterochrony {
 DESCRIBES: EvolutionaryOrDevelopmentalChangeInTiming
}

PROCESS Growth {
 INCREASES: SizeOrMass
 MAY_RESULT_FROM: [CellProliferation, CellGrowth, MatrixDeposition]
}

PROCESS Maturation {
 TRANSITIONS: DevelopingSystem
 TOWARD: FunctionalAdultOrLaterState
}

PROCESS Metamorphosis {
 IS_A: MajorDevelopmentalTransition
 IN_APPLICABLE_ORGANISMS: true
}

PROCESS Regeneration {
 RESTORES: LostOrDamagedBiologicalStructure
 MAY_REACTIVATE: DevelopmentalPrograms
}

PROCESS WoundRepair {
 RESTORES: TissueIntegrity
 MAY_INCLUDE: [Inflammation, Proliferation, MatrixDeposition, Remodelling]
}

RULE RegenerationRepairDistinction {
 Regeneration != generic_wound_repair
 WHEN original_structure_and_function_are_not_fully_restored
}

ENTITY DevelopmentalPlasticity {
 DESCRIBES: CapacityForDevelopmentalOutcomeToChangeWithEnvironmentOrState
}

PROCESS EnvironmentalDevelopmentalResponse {
 MODIFIES: Development
 IN_RESPONSE_TO: EnvironmentalFactor
}

ENTITY DevelopmentalConstraint {
 LIMITS: PossibleDevelopmentalTrajectories
}

ENTITY DevelopmentalRobustness {
 MAINTAINS: DevelopmentalOutcome
 DESPITE: Perturbation
}

ENTITY Canalization {
 IS_A: DevelopmentalRobustnessConcept
 REDUCES: PhenotypicVariation
 UNDER: DefinedPerturbations
}

PROCESS DevelopmentalMeasurement {
 MAY_MEASURE: [
  CellNumber,
  CellFate,
  GeneExpression,
  TissueShape,
  GrowthRate,
  Migration,
  SignallingActivity,
  DevelopmentalTiming
 ]
 MAY_USE: [Microscopy, LineageTracing, Sequencing, Imaging, MolecularAssay, GeneticPerturbation]
}

ENTITY LineageTracing {
 TRACKS: CellDescendants
 ACROSS: Development
}

ENTITY DevelopmentalMeasurementContext {
 HAS: [Organism, DevelopmentalStage, Tissue, CellType, SpatialPosition, Method, Timepoint]
}

RULE MeasurementContextRule {
 IF developmental_measurements ARE_COMPARED
 THEN DevelopmentalMeasurementContext MUST_BE preserved
}

ENTITY Evidence {
 TYPES: [
  DevelopmentalEvidence,
  LineageEvidence,
  GeneticEvidence,
  MolecularEvidence,
  CellularEvidence,
  ImagingEvidence,
  MorphologicalEvidence,
  PerturbationEvidence,
  ComparativeEvidence,
  ExperimentalEvidence,
  ComputationalEvidence,
  LiteratureEvidence
 ]
}

RULE EvidenceConvergence {
 IF IndependentEvidenceSources AGREE
 THEN Confidence := increase(Confidence)
}

RULE EvidenceConflict {
 IF EvidenceSources CONFLICT
 THEN {
  PRESERVE competing_developmental_models
  RECORD organism
  RECORD developmental_stage
  RECORD tissue
  RECORD cell_type
  RECORD spatial_position
  RECORD measurement_method
  RECORD timepoint
  RECORD provenance
  REDUCE confidence
 }
}

RELATION DevelopmentalBiology STUDIES DevelopmentalProcess
RELATION Fertilization PRODUCES Zygote
RELATION Gastrulation ESTABLISHES GermLayers
RELATION GermLayer GIVES_RISE_TO TissueLineage
RELATION Morphogen MAY_REGULATE CellFate
RELATION CellFateSpecification PRECEDES_OR_GUIDES Differentiation
RELATION DevelopmentalGeneRegulatoryNetwork REGULATES DevelopmentalGeneExpression
RELATION CellCellSignalling REGULATES Development
RELATION Morphogenesis GENERATES BiologicalForm
RELATION LineageTracing TRACKS CellLineage

SEMANTIC_EQUIVALENCE {
 "developmental biology" ~= "biology of organismal and tissue development"
 "development" ~= "ordered biological change across developmental time" WHEN developmental_context
 "cell fate" ~= "developmental cell outcome or trajectory"
 "EMT" ~= "epithelial-mesenchymal transition"
 "MET" ~= "mesenchymal-epithelial transition"
 "GRN" ~= "gene regulatory network" WHEN developmental_context
}

CONFIDENCE DevelopmentalBiologyAssertion {
 INPUTS: [
  lineage_support,
  genetic_support,
  molecular_support,
  cellular_support,
  morphological_support,
  spatial_support,
  temporal_support,
  perturbation_support,
  source_independence,
  semantic_consistency
 ]
 SCORE := weighted_sum(INPUTS)
 LEVEL :=
  IF SCORE >= 0.90 THEN "very_high"
  ELSE IF SCORE >= 0.75 THEN "high"
  ELSE IF SCORE >= 0.55 THEN "moderate"
  ELSE IF SCORE >= 0.35 THEN "low"
  ELSE "uncertain"
}

RULE LineageInference {
 IF labelled_cell descendants_are_tracked_over_time
 THEN lineage_relationship MAY_BE_SUPPORTED
}

RULE FateInference {
 IF precursor_state reproducibly_generates defined_descendant_state
 AND lineage_or_perturbation_evidence_supports_relationship
 THEN developmental_fate_relationship MAY_BE_SUPPORTED
}

RULE PatterningInference {
 IF spatial_signal_difference precedes_reproducible_spatial_fate_difference
 AND perturbation_changes_pattern
 THEN patterning_relationship MAY_BE_SUPPORTED
}

RULE GeneRegulationInference {
 IF regulatory_element_or_factor perturbation changes_target_expression
 IN developmental_context
 THEN developmental_regulatory_relationship MAY_BE_SUPPORTED
}

RULE CausalityConstraint {
 IF developmental_marker correlates_with developmental_outcome
 THEN DO_NOT_INFER causal_relationship
 WITHOUT temporal_mechanistic_or_interventional_evidence
}

QUERY DevelopmentalBiologyLookup(context_identifier) {
 RETURN [
  organism,
  developmental_stage,
  tissues,
  cell_types,
  lineage,
  patterning,
  morphogenesis,
  gene_regulation,
  signalling,
  growth,
  differentiation,
  measurements,
  evidence,
  confidence
 ]
}

QUERY DevelopmentalProcessLookup(process_identifier) {
 RETURN [
  inputs,
  precursor_states,
  outputs,
  cell_types,
  tissues,
  signalling,
  gene_regulation,
  mechanics,
  timing,
  evidence,
  confidence
 ]
}

QUERY CellLineageLookup(cell_identifier) {
 RETURN [
  precursor,
  descendants,
  potency,
  fate_decisions,
  differentiation_states,
  spatial_context,
  developmental_time,
  lineage_evidence,
  confidence
 ]
}

UPDATE_MODEL {
 ON new_developmental_evidence:
  validate_provenance()
  identify_organism_and_developmental_stage()
  normalize_tissue_cell_gene_and_signalling_identifiers()
  capture_spatial_position_and_developmental_time()
  capture_measurement_method_and_timepoint()
  map_cell_lineages_and_fate_transitions()
  map_signalling_and_gene_regulatory_relationships()
  map_morphogenesis_growth_and_mechanical_processes()
  map_regeneration_and_developmental_plasticity_when_relevant()
  compare_existing_developmental_models()
  preserve_conflicting_evidence()
  recalculate_confidence()
  regenerate_developmental_relationships()
  update_flow_hash()
}

AI_CONSUMPTION {
 MODE: FormalSemanticReasoning
 PARSE_AS: ExecutableFlowAlgebra
 PRIORITIES: [
  organism,
  developmental_stage,
  cell_lineage,
  cell_fate,
  differentiation,
  patterning,
  morphogenesis,
  developmental_signalling,
  gene_regulation,
  evidence_provenance,
  confidence
 ]
 REQUIREMENTS: [
  preserve_species_context,
  preserve_developmental_stage,
  preserve_tissue_cell_and_spatial_context,
  preserve_developmental_time,
  distinguish_cell_fate_from_differentiation,
  distinguish_gene_expression_from_gene_function,
  distinguish_germ_layer_origin_from_final_cell_identity,
  distinguish_regeneration_from_generic_repair,
  distinguish_correlation_from_causation,
  preserve_uncertainty
 ]
}

VALIDATE {
 REQUIRE DevelopmentalBiology
 REQUIRE DevelopmentalProcess
 REQUIRE DevelopmentalStage
 REQUIRE Fertilization
 REQUIRE Cleavage
 REQUIRE Gastrulation
 REQUIRE GermLayer
 REQUIRE Morphogenesis
 REQUIRE CellFate
 REQUIRE Differentiation
 REQUIRE DevelopmentalGeneRegulatoryNetwork
 REQUIRE CellCellSignalling
 REQUIRE Organogenesis
 REQUIRE Regeneration
 REQUIRE Evidence
 REQUIRE CONFIDENCE
 REQUIRE SEMANTIC_EQUIVALENCE
 REQUIRE UPDATE_MODEL
 REQUIRE AI_CONSUMPTION

 ASSERT CellFateSpecification != Differentiation
 ASSERT gene_expression != proof_of_function
 ASSERT germ_layer_origin != final_cell_identity
 ASSERT Regeneration != generic_wound_repair
 ASSERT correlation != causal_relationship
}

FLOW_HASH {
 ALGORITHM: SHA-256
 INPUT: canonicalize(entities, relations, processes, rules, semantic_equivalence, confidence_model, update_model, ai_consumption)
 PURPOSE: integrity_and_version_tracking
}

END flow "DevelopmentalBiologyOntology"