hyphal septin band

GO:0032163 · Cytoskeleton · Filament · Proposed

A septin band, i.e. a diffuse ring composed of a series of septin bars running parallel to the long axis of the cell, located at the junction between the mother cell and the germ tube (hypha) of a fungal cell growing filamentously. [GO:0032163]

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 form the diffuse bar series in the band at the junction between the mother cell and germ tube. `GO:0032163` GO:0032163 defines the hyphal septin band as a septin band composed of a series of septin bars.

Mechanism graphs

Hyphal septin-band topology (ASSEMBLY)

Septin proteins form a diffuse band of septin bars at the junction between a filamentous fungal mother cell and its germ tube.

Subject	Predicate	Object	Evidence
septin proteins	form	hyphal septin band	`GO:0032163` GO:0032163 defines the structure as a septin band composed of a series of septin bars.
hyphal septin band	is localized at	mother cell-germ tube junction	`GO:0032163` GO:0032163 locates the hyphal septin band at the mother cell-germ tube junction.

Discussions

INTERPRETATION (RESOLVED): Keep the hyphal septin band distinct from the generic septin band and from localized septin-ring structures. GO:0032163 denotes only the diffuse septin-bar band at the junction between a filamentous fungal mother cell and germ tube. GO:0032158 is the broader noncytokinetic septin-band class, while GO:0032172 and GO:0032168 denote ring-shaped septin structures within germ tubes or hyphae.
CURATION_TODO (OPEN): Resolve an exact source-neutral grounding for hyphal-septin-band septin proteins. The initial hyphal septin-band record uses a reviewed-label-only septin protein cohort rather than guessing InterPro, Pfam, or NCBIfam accessions that may not exactly delimit all septins that form diffuse hyphal band assemblies.

Evidence

GO:0032163 Gene Ontology cellular-component term for the hyphal septin band.
GO:0032158 OLS reports GO:0032158 septin band as the direct GO:0032163 parent.

Curation history

2026-09-30T14:56:44Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-30T14:57:40Z codex · EXPANDED_RECORD — Added septin-band parentage, a reviewed-label-only septin constituent, GO-backed hyphal-band topology, and boundary and component-grounding discussions.

Source: data/structures/cytoskeleton/hyphal_septin_band.yaml