hyphal septin ring

GO:0032168 · Cytoskeleton · Filament · Proposed

A tight ring-shaped structure that forms in the division plane within hyphae of filamentous fungi at sites where a septum will form; composed of septins as well as septin-associated proteins. [GO:0032168]

UniProt location names: UniProt Consortium, CC BY 4.0. Reference label and route sources.

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
septin proteins	Protein	part of	Reviewed label only (reviewed name; no accession asserted)			ESSENTIAL	Septin GTPases that assemble into the ring-shaped structure at future septation sites in filamentous fungal hyphae. `GO:0032168` GO:0032168 defines the hyphal septin ring as composed of septins and septin-associated proteins. `GO:0005940` GO:0005940 defines the broader septin ring as a septin- and septin-associated-protein structure.

Mechanism graphs

Hyphal septin-ring topology (ASSEMBLY)

Septin proteins form a ring-shaped structure at future septation sites in filamentous fungal hyphae.

Subject	Predicate	Object	Evidence
septin proteins	assemble into	hyphal septin ring	`GO:0032168` GO:0032168 defines the structure as a hyphal septin ring.
hyphal septin ring	forms at	hyphal septation site	`GO:0032168` GO:0032168 places the hyphal septin ring within hyphae of filamentous fungi at future septation sites.

Discussions

INTERPRETATION (RESOLVED): Keep the hyphal septin ring distinct from other localized fungal septin-ring states. GO:0032168 denotes the septin ring within filamentous fungal hyphae at future septation sites, while GO:0005940 denotes the broader septin ring class spanning bud-neck, pseudohyphal, prospore, hyphal, and medial-cortex examples. This record models only the hyphal septation-site subtype.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings and boundary status for hyphal septin-ring septins and septin-associated proteins. The first hyphal septin-ring record keeps only the reviewed-label-only septin protein cohort rather than guessing fungal-paralog family groundings or adding septin-associated proteins before their exact constituent boundary has been reviewed.

Evidence

GO:0032168 Gene Ontology cellular-component term for the hyphal septin ring.
GO:0005940 Gene Ontology cellular-component parent term for the septin ring.

Curation history

2026-09-29T00:12:01Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T00:12:44Z codex · EXPANDED_RECORD — Added septin-ring parentage, a reviewed-label-only septin constituent, a hyphal septation-site function, GO evidence, a nonmechanistic hyphal-septation topology graph, and boundary and component-grounding discussions.
2026-09-29T00:28:43Z codex · ADDRESSED_REVIEW — Resolved #1750 by removing the location-only function while keeping the future hyphal septation-site claim in the topology graph.

Source: data/structures/cytoskeleton/hyphal_septin_ring.yaml