identifier: traitmech:000504 label: AbiF system definition: An abortive infection system in which an organism possesses a pNP40-derived abiF locus whose single complete open reading frame encodes a phage-insensitivity determinant that inhibits bacteriophage phi 712 DNA replication. definition_source: DOI:10.1128/AEM.61.12.4321-4328.1995 trait_category: GENOMICS term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000214 evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Subcloning and deletion analysis of the recombinant plasmid pCG1 defined a 3.7-kb EcoRV-XbaI fragment as encoding phage insensitivity notes: Garvey et al. localized the pNP40 AbiF determinant to the EcoRV-XbaI fragment carried by recombinant plasmid pCG1. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The introduction of a frameshift mutation at the unique BglII site within this ORF disrupted the phage resistance phenotype, confirming that this ORF is responsible for the observed phage insensitivity notes: Garvey et al. showed that the single complete ORF in the pNP40-derived EcoRV-XbaI fragment is required for AbiF-associated phage resistance. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The mechanisms encoded by pPG01 and pCG1 in L. lactis subsp. lactis MG1614 conformed to the criteria defining abortive infection and were designated AbiE and AbiF, respectively notes: Garvey et al. designated the pNP40 phage-insensitivity determinant cloned on pCG1 as AbiF. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Analysis of the phage DNA content of phi 712-infected hosts containing AbiF demonstrated that it inhibited the rate of phage DNA replication notes: Garvey et al. measured reduced phage phi 712 DNA-replication rate in infected hosts carrying AbiF. - reference: DOI:10.1093/femsre/fuag009 snippet: 13 are two-component systems (AbiD, AbiD1, AbiD-like, AbiE, AbiF, AbiG, AbiL, AbiQ, AbiT, AbiV, PARIS, type I CBASS, Septu notes: The FEMS review counts AbiF among the confirmed two-component lactococcal Abi-like systems. canonical_examples: - taxon_id: NCBITaxon:1358 taxon_label: Lactococcus lactis note: Garvey et al. cloned the pNP40 AbiF determinant into pCG1 and showed that the cloned pNP40 region conferred abortive-infection phage insensitivity in Lactococcus lactis subsp. lactis MG1614. reference: DOI:10.1128/AEM.61.12.4321-4328.1995 causal_graphs: - graph_id: abif_locus_inhibits_lactococcal_phage_dna_replication title: AbiF inhibits lactococcal phage DNA replication description: Conservative system-level sketch linking a pNP40-derived abiF locus to inhibited phage phi 712 DNA replication, restricted phage propagation, and AbiF abortive-infection system possession. scope_status: NONMECHANISTIC scope_notes: The graph captures the original AbiF determinant as a pNP40-derived abortive-infection locus cloned on pCG1 that inhibits the rate of phage phi 712 DNA replication while leaving the exact AbiF protein function, phage trigger, host target, possible AbiD/AbiD1 homology-derived family boundary, natural locus breadth, and phage escape routes unresolved. nodes: - node_id: abif_locus label: abiF locus node_type: GENETIC_ELEMENT description: A pNP40-derived abortive-infection locus containing the open reading frame required for AbiF phage resistance. - node_id: restricted_phage_dna_replication label: restricted phage DNA replication node_type: BIOLOGICAL_PROCESS description: Reduced bacteriophage phi 712 DNA-replication rate in an infected host carrying AbiF. - node_id: restricted_phage_propagation label: restricted phage propagation node_type: BIOLOGICAL_PROCESS description: Reduced completion of phage propagation in an AbiF-containing infected host cell. - node_id: abif_system_trait label: AbiF system node_type: TRAIT grounding: traitmech:000504 description: Possession of a genome-encoded AbiF abortive-infection phage-defense system. - 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. edges: - subject: abif_locus predicate: contributes to predicate_id: RO:0002326 object: restricted_phage_dna_replication description: The pNP40 AbiF open reading frame is responsible for the phage-insensitivity phenotype and inhibits the rate of phage phi 712 DNA replication. evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The introduction of a frameshift mutation at the unique BglII site within this ORF disrupted the phage resistance phenotype, confirming that this ORF is responsible for the observed phage insensitivity notes: Garvey et al. showed that the single complete ORF in the pNP40-derived EcoRV-XbaI fragment is required for AbiF-associated phage resistance. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Analysis of the phage DNA content of phi 712-infected hosts containing AbiF demonstrated that it inhibited the rate of phage DNA replication notes: Garvey et al. measured reduced phage phi 712 DNA-replication rate in infected hosts carrying AbiF. - subject: restricted_phage_dna_replication predicate: contributes to predicate_id: RO:0002326 object: restricted_phage_propagation description: Inhibition of phage phi 712 DNA replication contributes to AbiF phage insensitivity. evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Subcloning and deletion analysis of the recombinant plasmid pCG1 defined a 3.7-kb EcoRV-XbaI fragment as encoding phage insensitivity notes: Garvey et al. localized the pNP40 AbiF determinant to the EcoRV-XbaI fragment carried by recombinant plasmid pCG1. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Analysis of the phage DNA content of phi 712-infected hosts containing AbiF demonstrated that it inhibited the rate of phage DNA replication notes: Garvey et al. measured reduced phage phi 712 DNA-replication rate in infected hosts carrying AbiF. - subject: restricted_phage_propagation predicate: confers predicate_id: METPO:2007700 object: abif_system_trait description: Restricted phage propagation realizes the AbiF abortive-infection system possession trait. evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The mechanisms encoded by pPG01 and pCG1 in L. lactis subsp. lactis MG1614 conformed to the criteria defining abortive infection and were designated AbiE and AbiF, respectively notes: Garvey et al. designated the pNP40 phage-insensitivity determinant cloned on pCG1 as AbiF. - reference: DOI:10.1093/femsre/fuag009 snippet: 13 are two-component systems (AbiD, AbiD1, AbiD-like, AbiE, AbiF, AbiG, AbiL, AbiQ, AbiT, AbiV, PARIS, type I CBASS, Septu notes: The FEMS review counts AbiF among the confirmed two-component lactococcal Abi-like systems. - subject: abif_system_trait predicate: is a predicate_id: rdfs:subClassOf object: abortive_infection_system_trait description: AbiF system possession is an abortive-infection-system trait. evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The mechanisms encoded by pPG01 and pCG1 in L. lactis subsp. lactis MG1614 conformed to the criteria defining abortive infection and were designated AbiE and AbiF, respectively notes: Garvey et al. designated the pNP40 phage-insensitivity determinant cloned on pCG1 as AbiF. - reference: DOI:10.1093/femsre/fuag009 snippet: 13 are two-component systems (AbiD, AbiD1, AbiD-like, AbiE, AbiF, AbiG, AbiL, AbiQ, AbiT, AbiV, PARIS, type I CBASS, Septu notes: The FEMS review counts AbiF among the confirmed two-component lactococcal Abi-like systems. discussions: - discussion_id: abif-function-and-host-breadth-gap prompt: Resolve the exact AbiF protein function, phage trigger, host target, AbiD/AbiD1 homology-derived family boundary, and natural locus breadth before minting narrower AbiF mechanism children. kind: KNOWLEDGE_GAP status: OPEN rationale: Garvey et al. support AbiF as a pNP40 determinant cloned on pCG1 that conforms to abortive-infection criteria, depends on a single complete open reading frame, and inhibits the rate of phage phi 712 DNA replication; the FEMS review retains AbiF among confirmed two-component lactococcal Abi-like systems. This first system-level record therefore leaves the direct phage trigger, exact AbiF molecular activity, relevant host target, AbiD/AbiD1-related family boundary, natural locus breadth, cell-death or growth-arrest route, and phage escape routes unresolved. evidence: - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: The introduction of a frameshift mutation at the unique BglII site within this ORF disrupted the phage resistance phenotype, confirming that this ORF is responsible for the observed phage insensitivity notes: Garvey et al. showed that the single complete ORF in the pNP40-derived EcoRV-XbaI fragment is required for AbiF-associated phage resistance. - reference: DOI:10.1128/AEM.61.12.4321-4328.1995 snippet: Analysis of the phage DNA content of phi 712-infected hosts containing AbiF demonstrated that it inhibited the rate of phage DNA replication notes: Garvey et al. measured reduced phage phi 712 DNA-replication rate in infected hosts carrying AbiF. - reference: DOI:10.1093/femsre/fuag009 snippet: 13 are two-component systems (AbiD, AbiD1, AbiD-like, AbiE, AbiF, AbiG, AbiL, AbiQ, AbiT, AbiV, PARIS, type I CBASS, Septu notes: The FEMS review counts AbiF among the confirmed two-component lactococcal Abi-like systems. attaches_to: - causal_graphs#abif_locus_inhibits_lactococcal_phage_dna_replication posed_by: codex posed_date: '2026-10-01' curation_history: - timestamp: '2026-10-01T01:32:44Z' curator: codex action: MINTED_TRAITMECH_ID changes: Minted AbiF system as a DOI-backed GENOMICS TraitRecord under the abortive infection system parent after an ignored-and-hidden duplicate review found no exact live TraitMech, METPO, history, or prior proposal record; the replacement placeholder is reserved in proposals/metpo_traitmech_v381. 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