Gao-Ppl system

traitmech:000356 · CLASS · PROPOSED

A phage defense system in which an organism possesses a Gao_Ppl locus represented by DefenseFinder as a single-profile model requiring Gao_Ppl__PplA.

Trait evidence (4)

PMID:32855333
By systematic defense gene prediction and heterologous reconstitution, here we discover 29 widespread antiviral gene cassettes, collectively present in 32% of all sequenced bacterial and archaeal genomes, that mediate protection against specific bacteriophages.

Gao et al. support a systematic defense-gene prediction and heterologous reconstitution campaign that discovered widespread antiviral gene cassettes.
https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md
Gao_Ppl | 10\.1126/science\.aba0372 | Diverse enzymatic activities mediate antiviral immunity in prokaryotes

The DefenseFinder article registry maps the named Gao_Ppl system to the Gao et al. prokaryotic antiviral-immunity paper.
https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv
Gao_Ppl Gao_Ppl 1 1 Gao_Ppl__PplA

The DefenseFinder rules table models Gao_Ppl as a single-mandatory-profile system with the Gao_Ppl__PplA profile.
https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md
| Gao_Ppl__PplA | Gao_Ppl__PplA | Gao_Ppl | Custom | 100 |

The DefenseFinder HMM inventory records Gao_Ppl__PplA under Gao_Ppl.

Gao-Ppl loci confer bacterial phage defense

Conservative system-level sketch linking possession of a Gao_Ppl locus to Gao et al. antiviral cassette defense without asserting the unresolved PplA component activity.

NONMECHANISTIC · The graph captures Gao-Ppl as a named DefenseFinder single-profile Gao-family system while leaving natural hosts, PplA protein function, phage triggers, and direct effector activity unresolved.

Edge evidence

Gao_Ppl locus contributes to Gao 2020 antiviral cassette defense RO:0002326
DefenseFinder maps Gao_Ppl to the Gao et al. systematic antiphage-system discovery paper and models it as a single-profile system requiring PplA.
- PMID:32855333 By systematic defense gene prediction and heterologous reconstitution, here we discover 29 widespread antiviral gene cassettes, collectively present in 32% of all sequenced bacterial and archaeal genomes, that mediate protection against specific bacteriophages. Gao et al. support bacteriophage protection by widespread antiviral gene cassettes.
- https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md Gao_Ppl | 10\.1126/science\.aba0372 | Diverse enzymatic activities mediate antiviral immunity in prokaryotes The DefenseFinder article registry maps the named Gao_Ppl system to the Gao et al. prokaryotic antiviral-immunity paper.
- https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv Gao_Ppl Gao_Ppl 1 1 Gao_Ppl__PplA The DefenseFinder rules table models Gao_Ppl as a single-mandatory-profile system with the Gao_Ppl__PplA profile.
- https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md | Gao_Ppl__PplA | Gao_Ppl__PplA | Gao_Ppl | Custom | 100 | The DefenseFinder HMM inventory records Gao_Ppl__PplA under Gao_Ppl.
Gao 2020 antiviral cassette defense confers Gao-Ppl system METPO:2007700
Gao_Ppl-associated antiviral cassette defense realizes the Gao-Ppl system trait.
- PMID:32855333 By systematic defense gene prediction and heterologous reconstitution, here we discover 29 widespread antiviral gene cassettes, collectively present in 32% of all sequenced bacterial and archaeal genomes, that mediate protection against specific bacteriophages. Gao et al. support bacteriophage protection by widespread antiviral gene cassettes.
Gao-Ppl system is a phage defense system rdfs:subClassOf
Gao-Ppl system possession is a phage-defense-system trait.
- https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md Gao_Ppl | 10\.1126/science\.aba0372 | Diverse enzymatic activities mediate antiviral immunity in prokaryotes The DefenseFinder article registry maps the named Gao_Ppl system to the Gao et al. prokaryotic antiviral-immunity paper.
- https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/DefenseFinder_rules.tsv Gao_Ppl Gao_Ppl 1 1 Gao_Ppl__PplA The DefenseFinder rules table models Gao_Ppl as a single-mandatory-profile system with the Gao_Ppl__PplA profile.

Provenance

Identifier source: TraitMech local identifier
Definition source: DOI:10.1126/science.aba0372

Parent traits (1)

phage defense system traitmech:000209

Synonyms (2)

Gao_Ppl RELATED_SYNONYM · https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/List_system_article.md
Gao_Ppl__PplA RELATED_SYNONYM · https://raw.githubusercontent.com/mdmparis/defense-finder-models/afb0e5a8b466be53586b13266f5d38d98c3ac268/Liste_hmm_system.md

kg-microbe context

No kg-microbe node embedding matched this record in the 2026-04-25 deepwalk.

Discussions and Knowledge Gaps (1)

Open questions attached to this trait. Seeded by just knowledge-gap-scan and curated; see the corpus-wide index.

Resolve Gao_Ppl natural hosts, PplA component function, phage triggers, and effector activity before minting narrower Gao_Ppl mechanism children.

KNOWLEDGE GAP OPEN gao-ppl-mechanism-gap · raised by codex · 2026-09-22

Attached to causal_graphs#gao_ppl_locus_restricts_phage

Gao et al. support widespread antiviral gene cassettes that mediate protection against specific bacteriophages, and DefenseFinder models Gao_Ppl as a single-profile system. The exact natural host breadth, PplA component identity, phage trigger, and profile-to-activity mapping remain unresolved.

Curation history

2026-09-22T06:23:08Z · MINTED_TRAITMECH_ID · codex
Minted Gao-Ppl system as a DOI-backed GENOMICS TraitRecord under phage defense system 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_v233.