identifier: traitmech:000344 label: AbiA system definition: An abortive infection system in which an organism possesses an AbiA-family locus whose copy number or expression modulates Lactococcus lactis resistance to multiple phages and that DefenseFinder represents with AbiA_large or AbiA_small model subrules. definition_source: DOI:10.1128/aem.60.4.1129-1136.1994 trait_category: GENOMICS term_kind: CLASS mapping_status: PROPOSED parent_traits: - traitmech:000214 synonyms: - synonym_text: AbiA synonym_type: RELATED_SYNONYM source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md - synonym_text: AbiA_large synonym_type: RELATED_SYNONYM source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md - synonym_text: AbiA_small synonym_type: RELATED_SYNONYM source: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md - synonym_text: hsp synonym_type: RELATED_SYNONYM source: DOI:10.1128/aem.60.4.1129-1136.1994 evidence: - reference: PMID:16349225 snippet: The abiA gene (formerly hsp) encodes an abortive phage infection mechanism which inhibits phage DNA replication. notes: Dinsmore and Klaenhammer describe abiA as the former hsp abortive-infection determinant and connect AbiA activity to inhibition of phage DNA replication. - reference: PMID:16349225 snippet: Three abiA-containing plasmids of various copy numbers were introduced into both strains, and the recombinants were evaluated for resistance to phages c2, p2, sk1, and phi31. notes: Dinsmore and Klaenhammer tested AbiA across two Lactococcus lactis strains and four lactococcal phages. - reference: PMID:16349225 snippet: Altering the gene dosage or expression level of abiA significantly affects the phage resistance levels. notes: Dinsmore and Klaenhammer show that AbiA dosage or expression modulates the strength of lactococcal phage resistance. - reference: PMID:9661658 snippet: The abiA gene encodes an abortive bacteriophage infection mechanism that can protect Lactococcus species from infection by a variety of bacteriophages including three unrelated phage species. notes: Dinsmore and Klaenhammer support AbiA as a broad lactococcal abortive-infection mechanism. - reference: PMID:9661658 snippet: the leucine repeat structure is essential for conferring phage resistance against three species of lactococcal bacteriophages. notes: Dinsmore and Klaenhammer connect residues in AbiA's leucine-repeat region to resistance against c2, sk1, and phi31. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md snippet: 'AbiA | 10\.1016/j\.mib\.2005\.06\.006 | Phage abortive infection in lactococci: variations on a theme' notes: The DefenseFinder article registry maps the named AbiA model namespace to a lactococcal abortive-infection review. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_large\t1\t1\tAbiA_large__AbiA_large" notes: The DefenseFinder rules table models one AbiA subrule as the single-profile AbiA_large subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_small\t2\t2\tAbiA_small__AbiA_SLATT, AbiA_small__AbiA_small" notes: The DefenseFinder rules table models one AbiA subrule as a two-profile AbiA_small subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_large__AbiA_large | AbiA_large__AbiA_large | AbiA_large | Custom | 250 |' notes: The DefenseFinder HMM inventory records AbiA_large__AbiA_large under the AbiA_large model namespace. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_small__AbiA_SLATT | AbiA_small__AbiA_SLATT | AbiA_small | Custom | 20 |' notes: The DefenseFinder HMM inventory records AbiA_small__AbiA_SLATT under the AbiA_small model namespace. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_small__AbiA_small | AbiA_small__AbiA_small | AbiA_small | Custom | 300 |' notes: The DefenseFinder HMM inventory records AbiA_small__AbiA_small under the AbiA_small model namespace. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_small__SLATT | | AbiA_small | Custom | 40 |' notes: The DefenseFinder HMM inventory also records AbiA_small__SLATT under the AbiA_small model namespace. canonical_examples: - taxon_id: NCBITaxon:1358 taxon_label: Lactococcus lactis note: Dinsmore and Klaenhammer varied abiA copy number in Lactococcus lactis MG1363 and NCK203 and assayed resistance to phages c2, p2, sk1, and phi31. reference: DOI:10.1128/aem.60.4.1129-1136.1994 causal_graphs: - graph_id: abia_locus_inhibits_phage_dna_replication title: AbiA activity inhibits lactococcal phage DNA replication description: Conservative system-level sketch linking an AbiA-family locus to phage-DNA-replication inhibition, reduced lactococcal phage propagation, and AbiA-system possession without asserting the unresolved direct phage trigger or molecular target. scope_status: NONMECHANISTIC scope_notes: The graph captures AbiA as a named DefenseFinder abortive-infection system with AbiA_large and AbiA_small subrules. It leaves the direct phage trigger, the natural boundaries of the DefenseFinder subrules, the molecular effector activity, the DNA-replication target, and phage escape routes unresolved. nodes: - node_id: abia_locus label: AbiA locus node_type: GENETIC_ELEMENT description: An AbiA-family abortive-infection locus represented by the DefenseFinder AbiA_large or AbiA_small subrules. - node_id: phage_dna_replication_inhibition label: phage DNA replication inhibition node_type: BIOLOGICAL_PROCESS description: Inhibition of bacteriophage DNA replication in AbiA-containing Lactococcus lactis. - node_id: reduced_lactococcal_phage_propagation label: reduced lactococcal phage propagation node_type: BIOLOGICAL_PROCESS description: Reduced propagation of lactococcal phages in cells carrying an AbiA-family abortive-infection system. - node_id: abia_system_trait label: AbiA system node_type: TRAIT grounding: traitmech:000344 description: Possession of a genome-encoded AbiA 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: abia_locus predicate: contributes to predicate_id: RO:0002326 object: phage_dna_replication_inhibition description: AbiA activity inhibits phage DNA replication, and DefenseFinder represents AbiA with AbiA_large and AbiA_small model subrules. evidence: - reference: PMID:16349225 snippet: The abiA gene (formerly hsp) encodes an abortive phage infection mechanism which inhibits phage DNA replication. notes: Dinsmore and Klaenhammer describe abiA as the former hsp abortive-infection determinant and connect AbiA activity to inhibition of phage DNA replication. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_large\t1\t1\tAbiA_large__AbiA_large" notes: The DefenseFinder rules table models one AbiA subrule as the single-profile AbiA_large subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_small\t2\t2\tAbiA_small__AbiA_SLATT, AbiA_small__AbiA_small" notes: The DefenseFinder rules table models one AbiA subrule as a two-profile AbiA_small subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_large__AbiA_large | AbiA_large__AbiA_large | AbiA_large | Custom | 250 |' notes: The DefenseFinder HMM inventory records AbiA_large__AbiA_large under the AbiA_large model namespace. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_small__AbiA_small | AbiA_small__AbiA_small | AbiA_small | Custom | 300 |' notes: The DefenseFinder HMM inventory records AbiA_small__AbiA_small under the AbiA_small model namespace. - subject: abia_locus predicate: contributes to predicate_id: RO:0002326 object: reduced_lactococcal_phage_propagation description: Changing abiA dosage or expression changes Lactococcus lactis resistance to c2, p2, sk1, and phi31. evidence: - reference: PMID:16349225 snippet: Altering the gene dosage or expression level of abiA significantly affects the phage resistance levels. notes: Dinsmore and Klaenhammer connected abiA dosage and expression to lactococcal phage resistance level. - subject: reduced_lactococcal_phage_propagation predicate: confers predicate_id: METPO:2007700 object: abia_system_trait description: AbiA-mediated reduction of lactococcal phage propagation realizes the AbiA system trait. evidence: - reference: PMID:9661658 snippet: can protect Lactococcus species from infection by a variety of bacteriophages including three unrelated phage species notes: Dinsmore and Klaenhammer describe the AbiA system as protecting Lactococcus from multiple phage species. - subject: abia_system_trait predicate: is a predicate_id: rdfs:subClassOf object: abortive_infection_system_trait description: AbiA system possession is an abortive-infection-system trait. evidence: - reference: PMID:16349225 snippet: The abiA gene (formerly hsp) encodes an abortive phage infection mechanism which inhibits phage DNA replication. notes: Dinsmore and Klaenhammer describe abiA as the former hsp abortive-infection determinant and connect AbiA activity to inhibition of phage DNA replication. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md snippet: 'AbiA | 10\.1016/j\.mib\.2005\.06\.006 | Phage abortive infection in lactococci: variations on a theme' notes: The DefenseFinder article registry maps the named AbiA model namespace to a lactococcal abortive-infection review. discussions: - discussion_id: abia-defensefinder-subrule-gap prompt: Resolve the AbiA_large and AbiA_small system boundaries, phage trigger, direct DNA-replication target, and molecular effector output before minting narrower AbiA mechanism children. kind: KNOWLEDGE_GAP status: OPEN rationale: Dinsmore and Klaenhammer support AbiA as a lactococcal abortive-infection determinant whose copy number or expression changes phage resistance and whose leucine-repeat region is required for activity against multiple phage species. DefenseFinder models AbiA through AbiA_large and AbiA_small subrules, but this first system-level record leaves those subrules' natural locus boundaries, the direct phage trigger, the molecular effector output, the exact phage-DNA-replication target, and phage escape routes unresolved. evidence: - reference: PMID:16349225 snippet: The abiA gene (formerly hsp) encodes an abortive phage infection mechanism which inhibits phage DNA replication. notes: Dinsmore and Klaenhammer describe abiA as the former hsp abortive-infection determinant and connect AbiA activity to inhibition of phage DNA replication. - reference: PMID:9661658 snippet: the leucine repeat structure is essential for conferring phage resistance against three species of lactococcal bacteriophages. notes: Dinsmore and Klaenhammer identify an AbiA leucine-repeat region needed for phage resistance. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_large\t1\t1\tAbiA_large__AbiA_large" notes: The DefenseFinder rules table models one AbiA subrule as the single-profile AbiA_large subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv snippet: "AbiA\tAbiA_small\t2\t2\tAbiA_small__AbiA_SLATT, AbiA_small__AbiA_small" notes: The DefenseFinder rules table models one AbiA subrule as a two-profile AbiA_small subsystem. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_large__AbiA_large | AbiA_large__AbiA_large | AbiA_large | Custom | 250 |' notes: The DefenseFinder HMM inventory records AbiA_large__AbiA_large under the AbiA_large model namespace. - reference: https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md snippet: '| AbiA_small__AbiA_small | AbiA_small__AbiA_small | AbiA_small | Custom | 300 |' notes: The DefenseFinder HMM inventory records AbiA_small__AbiA_small under the AbiA_small model namespace. attaches_to: - causal_graphs#abia_locus_inhibits_phage_dna_replication posed_by: codex posed_date: '2026-09-21' curation_history: - timestamp: '2026-09-21T20:16:02Z' curator: codex action: MINTED_TRAITMECH_ID changes: Minted AbiA 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_v221. llm_assisted: true - timestamp: '2026-09-21T20:44:00Z' curator: codex action: ADDRESS_PR_REVIEW changes: 'Addressed PR #1218 review issues #1219 and #1220 by aligning the v221 METPO ROBOT TSV definition with this TraitRecord and moving the AbiA dosage and expression evidence onto a direct AbiA locus edge.' llm_assisted: true