identifier: traitmech:000214 label: abortive infection system definition: A genomics trait describing possession of a bacteriophage abortive-infection defense system in which phage infection activates a host-encoded growth-arrest or cell-death program that prevents completion of phage replication and protects nearby bacterial cells. definition_source: DOI:10.1146/annurev-virology-011620-040628 trait_category: GENOMICS term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000209 synonyms: - synonym_text: Abi system synonym_type: EXACT_SYNONYM source: DOI:10.1093/nar/gkt1419 evidence: - reference: DOI:10.1146/annurev-virology-011620-040628 snippet: A commonly used phage resistance strategy is abortive infection (Abi), in which the infected cell commits suicide before the phage can complete its replication cycle notes: Lopatina et al. support abortive infection as a phage resistance strategy that blocks completion of the phage replication cycle. - reference: DOI:10.1146/annurev-virology-011620-040628 snippet: The Abi strategy is manifested by a plethora of mechanistically diverse defense systems that are abundant in bacterial genomes notes: Lopatina et al. support defining the trait at the broad Abi system level rather than as one toxin-antitoxin family. - reference: DOI:10.1073/pnas.0808832106 snippet: Resistance strategies include the abortive infection (Abi) systems, which promote cell death and limit phage replication within a bacterial population notes: Fineran et al. summarize the cell-death and phage-limitation outputs of abortive infection systems. - reference: DOI:10.1093/nar/gkt1419 snippet: AbiE systems are encoded by bicistronic operons and function via a non-interacting (Type IV) bacteriostatic TA mechanism notes: Dy et al. support AbiE as a bacteriostatic toxin-antitoxin Abi family, one reason the parent record should cover growth arrest as well as cell death. canonical_examples: - taxon_id: NCBITaxon:29471 taxon_label: Pectobacterium atrosepticum note: Fineran et al. identified the native toxIN locus from Erwinia carotovora subspecies atroseptica 1039 and demonstrated ToxIN-mediated phage resistance. reference: DOI:10.1073/pnas.0808832106 causal_graphs: - graph_id: abortive_infection_population_level_defense title: Abortive infection halts infected cells to limit phage spread description: Evidence-backed process sketch linking phage-triggered Abi activation to infected-host growth arrest or death, restricted phage replication, and protection of nearby bacterial cells. scope_status: NONMECHANISTIC scope_notes: The graph captures the shared Abi strategy without claiming that other abortive-infection families use one exact sensor, effector, toxin-antitoxin architecture, or cell-death mechanism. nodes: - node_id: phage_infection label: phage infection node_type: BIOLOGICAL_PROCESS description: Entry and intracellular replication attempt by a bacteriophage infecting a host bacterium. - node_id: abortive_infection_system_activation label: abortive infection system activation node_type: BIOLOGICAL_PROCESS description: Phage-infection-triggered activation of a host Abi system. - node_id: host_growth_arrest_or_cell_death label: host growth arrest or cell death node_type: BIOLOGICAL_PROCESS description: Abi-system output in which an infected host cell undergoes growth arrest or dies before productive phage replication is completed. - node_id: phage_replication label: phage replication node_type: BIOLOGICAL_PROCESS description: Replication and completion of a bacteriophage infection cycle inside a host cell. - node_id: bacterial_population_protection label: bacterial population protection node_type: BIOLOGICAL_PROCESS description: Reduced phage spread that protects nearby bacterial cells in the same population. - node_id: abortive_infection_system_trait label: abortive infection system node_type: TRAIT grounding: traitmech:000214 description: Possession of a genome-encoded abortive-infection phage defense system. - node_id: phage_defense_system label: phage defense system node_type: TRAIT grounding: traitmech:000209 description: Possession of one or more genome-encoded immune systems that inhibit bacteriophage infection. edges: - subject: phage_infection predicate: activates predicate_id: RO:0002213 object: abortive_infection_system_activation description: Phage infection triggers Abi defense-system activation. evidence: - reference: DOI:10.1093/nar/gkt1419 snippet: Bacterial abortive infection (Abi) systems are ‘altruistic’ cell death systems that are activated by phage infection and limit viral replication, thereby providing protection to the bacterial population notes: Dy et al. support phage-triggered activation as a defining Abi-system behavior. - subject: abortive_infection_system_activation predicate: activates predicate_id: RO:0002213 object: host_growth_arrest_or_cell_death description: Abi activation produces growth-arrest or cell-death outputs through family-specific effectors. evidence: - reference: DOI:10.1073/pnas.0808832106 snippet: Resistance strategies include the abortive infection (Abi) systems, which promote cell death and limit phage replication within a bacterial population notes: Fineran et al. support cell death as an abortive-infection output. - reference: DOI:10.1093/nar/gkt1419 snippet: AbiE systems are encoded by bicistronic operons and function via a non-interacting (Type IV) bacteriostatic TA mechanism notes: Dy et al. support bacteriostasis as an AbiE output, distinct from obligate cell death. - subject: host_growth_arrest_or_cell_death predicate: mitigates predicate_id: METPO:2007407 object: phage_replication description: Arrest or death of the infected host cell limits completion of phage replication. evidence: - reference: DOI:10.1146/annurev-virology-011620-040628 snippet: A commonly used phage resistance strategy is abortive infection (Abi), in which the infected cell commits suicide before the phage can complete its replication cycle notes: Lopatina et al. connect infected-cell death to premature phage-cycle termination. - subject: host_growth_arrest_or_cell_death predicate: contributes to predicate_id: RO:0002326 object: bacterial_population_protection description: The local cost of infected-cell arrest or death protects neighboring bacteria by limiting onward phage spread. evidence: - reference: DOI:10.1146/annurev-virology-011620-040628 snippet: Abi prevents the phage epidemic from spreading to nearby cells, thus protecting the bacterial colony notes: Lopatina et al. support the population-level benefit of abortive infection. - subject: host_growth_arrest_or_cell_death predicate: confers predicate_id: METPO:2007700 object: abortive_infection_system_trait description: Phage-triggered infected-host arrest or death realizes the abortive-infection defense phenotype. evidence: - reference: DOI:10.1073/pnas.0808832106 snippet: abortive infection (Abi) systems, which promote cell death and limit phage replication within a bacterial population notes: Fineran et al. support cell death coupled to limited phage replication as the Abi defense output. - subject: abortive_infection_system_trait predicate: is a predicate_id: rdfs:subClassOf object: phage_defense_system description: Abortive-infection-system possession is a phage-defense-system trait. evidence: - reference: DOI:10.1146/annurev-virology-011620-040628 snippet: The Abi strategy is manifested by a plethora of mechanistically diverse defense systems that are abundant in bacterial genomes notes: Lopatina et al. place abortive infection among bacterial antiviral defense systems. discussions: - discussion_id: abortive-infection-subfamily-split-gap prompt: Resolve other abortive-infection families before minting narrower children under the broad abortive infection system parent. kind: KNOWLEDGE_GAP status: OPEN rationale: ToxIN, AbiQ, AbiE, AbiF, AbiZ, AbiK, AbiT, AbiV, BstA, Stk2, AbiH, AbiG, AbiI, AbiR, AbiD, AbiB, AbiC, AbiU, AbiAlpha, Pif, RexAB, SpbK, CmdTAC, Abi2, AbiJ, AbiL, AbiN, AbiO, AbiP2, AbiA, and PD-T4-10 are split out as traitmech:000226, traitmech:000225, traitmech:000227, traitmech:000504, traitmech:000228, traitmech:000229, traitmech:000230, traitmech:000300, traitmech:000301, traitmech:000303, traitmech:000304, traitmech:000306, traitmech:000316, traitmech:000317, traitmech:000318, traitmech:000319, traitmech:000320, traitmech:000321, traitmech:000322, traitmech:000323, traitmech:000324, traitmech:000325, traitmech:000335, traitmech:000338, traitmech:000339, traitmech:000340, traitmech:000341, traitmech:000342, traitmech:000343, traitmech:000344, and traitmech:000394, respectively. Lopatina et al., Fineran et al., Dy et al., Garvey et al., Durmaz and Klaenhammer, Wang et al., Bouchard et al., Haaber et al., Owen et al., Depardieu et al., Prevots et al., O'Connor et al., Su et al., Twomey et al., McLandsborough et al., Parreira et al., Durmaz et al., Dai et al., Lossouarn et al., Cram et al., Parma et al., Johnson et al., Vassallo et al., Chopin et al., Anba et al., Deng et al., Prevots et al., Prevots and Ritzenthaler, Odegrip et al., Dinsmore and Klaenhammer, and Dinsmore et al. still support abortive infection as a genomically encoded phage defense strategy that spans mechanistically diverse toxin-antitoxin, pNP40-derived lactococcal AbiF DNA-replication-inhibition, premature-lysis, RT-related polymerase, two-component, translation-inhibition, prophage-encoded DNA-replication-inhibition, staphylococcal-kinase-triggered cell death, lactococcal AbiH phage resistance, two-gene lactococcal AbiG RNA-synthesis interference, single-ORF lactococcal AbiI burst-size reduction, two-separated-locus lactococcal AbiR DNA-replication impediment, pBF61-derived lactococcal AbiD burst-size reduction, lactococcal AbiB phage-transcript decay, lactococcal AbiC Prf infected-cell death, lactococcal AbiU phage-transcription delay, enterococcal AbiAlpha premature lysis, F-plasmid pif-region T7 abortive infection, lambda Rex two-component phage exclusion, ICEBs1 SpbK abortive SPβ defense, CmdTAC mRNA ADP-ribosyltransferase abortive infection, DefenseFinder Abi2/PF07751 Abi-like loci, single-profile lactococcal AbiJ loci, two-component lactococcal AbiL ATPase/TOPRIM-family loci, single-gene lactococcal AbiN loci, single-profile lactococcal AbiO loci, single-profile coliphage AbiP2 reverse-transcriptase-like loci, lactococcal AbiA loci represented by DefenseFinder AbiA-large and AbiA-small subrules, DefenseFinder PD-T4-10 two-profile loci, and other families. Additional narrower TraitRecords need separate review to ground each subfamily's trigger, effector, growth-arrest or cell-death mechanism, and phage escape routes. posed_by: codex posed_date: '2026-09-15' curation_history: - timestamp: '2026-09-15T11:47:52Z' curator: codex action: MINTED_TRAITMECH_ID changes: Minted abortive infection system as a DOI-backed GENOMICS TraitRecord under the phage defense system parent after an ignored-and-hidden duplicate review found no exact live TraitMech, METPO, or prior proposal record; the replacement placeholder is reserved in proposals/metpo_traitmech_v91. llm_assisted: true - timestamp: '2026-09-15T18:45:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Removed AbiQ from the open abortive-infection subfamily split-gap discussion after minting traitmech:000225 for the AbiQ system; ToxIN, AbiE, and other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-15T19:25:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Removed ToxIN from the open abortive-infection subfamily split-gap discussion after minting traitmech:000226 for the ToxIN system; AbiE and other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-15T19:46:31Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Removed AbiE from the open abortive-infection subfamily split-gap discussion after minting traitmech:000227 for the AbiE system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-15T20:35:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiZ as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000228 for the AbiZ system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-15T21:30:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiK as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000229 for the AbiK system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-15T22:05:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiT as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000230 for the AbiT system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T03:07:26Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiV as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000300 for the AbiV system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T04:10:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Reframed AbiV in the open abortive-infection subfamily split-gap discussion as a translation-inhibition family after adding the Haaber et al. AbiV-SaV follow-up evidence. llm_assisted: true - timestamp: '2026-09-20T04:37:49Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented BstA as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000301 for the BstA system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T07:41:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented Stk2 as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000303 for the Stk2 system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T08:12:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiH as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000304 for the AbiH system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T09:16:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiG as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000306 for the AbiG system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T18:33:35Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiI as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000316 for the AbiI system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T19:30:11Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiR as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000317 for the AbiR system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T20:30:21Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiD as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000318 for the AbiD system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T21:21:13Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiB as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000319 for the AbiB system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T22:01:25Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiC as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000320 for the AbiC system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T22:48:13Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiU as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000321 for the AbiU system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-20T23:47:18Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiAlpha as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000322 for the AbiAlpha system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T01:30:13Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented Pif as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000323 for the Pif system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T02:17:08Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented RexAB as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000324 for the RexAB system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T03:22:01Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented SpbK as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000325 for the SpbK system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T03:45:00Z' curator: codex action: REVISED_TEXT changes: Standardized curator-written SPβ phage mentions to the canonical Greek beta spelling while preserving Johnson et al. evidence snippets exactly as exposed by the PLOS XML. llm_assisted: true - timestamp: '2026-09-21T12:07:14Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented CmdTAC as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000335 for the CmdTAC system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T12:26:31Z' curator: codex action: ADDRESS_PR_REVIEW changes: Corrected the CmdTAC split-gap source attribution from Goesswein et al. to Vassallo et al. after verifying DOI:10.1038/s41586-024-08102-8 against Crossref and Europe PMC metadata. llm_assisted: true - timestamp: '2026-09-21T14:52:54Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented Abi2 as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000338 for the Abi2 system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T16:24:10Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiJ as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000339 for the AbiJ system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T17:17:23Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiL as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000340 for the AbiL system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T17:52:23Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiN as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000341 for the AbiN system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T18:34:42Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiO as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000342 for the AbiO system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T19:10:27Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiP2 as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000343 for the AbiP2 system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-21T20:16:03Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiA as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000344 for the AbiA system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-09-26T21:25:00Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: 'Addressed review issue #1298 by documenting PD-T4-10 as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000394 for the PD-T4-10 system; other abortive-infection families remain open.' llm_assisted: true - timestamp: '2026-10-01T01:32:45Z' curator: codex action: RESOLVE_DISCUSSION_SCOPE changes: Documented AbiF as split out in the open abortive-infection subfamily split-gap discussion after minting traitmech:000504 for the AbiF system; other abortive-infection families remain open. llm_assisted: true - timestamp: '2026-10-01T03:14:00Z' curator: codex action: ADDRESS_ABIF_REVIEW_FINDING changes: 'Addressed adversarial review issue #1505 by clarifying that pNP40 is the AbiF determinant source context and that pCG1 is the recombinant plasmid clone used in the Garvey et al. subcloning experiment.' llm_assisted: true