prospore septin ring

GO:0032169 · Cytoskeleton · Filament · Proposed

A tight ring-shaped structure that forms in the division plane at the site of cytokinesis in a prospore; composed of septins as well as septin-associated proteins. [GO:0032169]

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 the prospore cytokinesis site. `GO:0032169` GO:0032169 defines the prospore 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

Prospore septin-ring topology (ASSEMBLY)

Septin proteins form a ring-shaped structure at the site of cytokinesis in a prospore.

Subject	Predicate	Object	Evidence
septin proteins	assemble into	prospore septin ring	`GO:0032169` GO:0032169 defines the prospore septin ring as composed of septins and septin-associated proteins.
prospore septin ring	forms at	prospore cytokinesis site	`GO:0032169` GO:0032169 places the prospore septin ring at the site of cytokinesis in a prospore.

Discussions

INTERPRETATION (RESOLVED): Keep the prospore septin ring distinct from other localized fungal septin-ring states. GO:0032169 denotes the septin ring at the site of cytokinesis in a prospore. GO:0032172 covers germ-tube future septation sites, GO:0032168 covers hyphal future septation sites, GO:0032170 covers mother-cell/pseudohyphal-projection junctions, GO:0032177 covers the two split septin rings formed from the bud-neck septin collar at budding-cell cytokinesis, and GO:0005940 denotes the broader septin ring class. This record models only the prospore subtype.
CURATION_TODO (OPEN): Resolve exact source-neutral family groundings and boundary status for prospore septin-ring septins and septin-associated proteins. The first prospore 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:0032169 Gene Ontology cellular-component term for the prospore septin ring.
GO:0005940 Gene Ontology cellular-component parent term for the septin ring.

Curation history

2026-09-29T02:34:34Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-29T02:35:42Z codex · EXPANDED_RECORD — Added septin-ring parentage, a reviewed-label-only septin constituent, GO evidence, a nonmechanistic prospore-ring topology graph, and boundary and component-grounding discussions.
2026-09-29T02:53:24Z codex · ADDRESSED_REVIEW — Resolved #1757 by distinguishing the GO:0032169 prospore septin ring from GO:0032177 cytokinetic bud-neck split septin rings.

Source: data/structures/cytoskeleton/prospore_septin_ring.yaml