cellular bud neck

GO:0005935 · Other · Subcellular region · Proposed

The constricted cellular region between a mother cell and its daughter bud in budding organisms. [GO:0005935]

Synonyms: bud neck

Part of: cellular bud (GO:0005933)

Has part: septin ring (GO:0005940)

Xrefs: uniprot.location:SL-0029 — Bud neck

Taxonomic distribution

NCBITaxon:4932 Saccharomyces cerevisiae — COMMON: Budding yeast organizes a mother-bud neck where septins assemble during polarized bud growth and cytokinesis. [DOI:10.3389/fcell.2016.00123]

NCBITaxon:4932 Saccharomyces cerevisiae — Budding-yeast model in which Cdc3, Cdc10, Cdc11, Cdc12, and Shs1 septins organize at the mother-bud neck. [DOI:10.1534/genetics.107.073007]

bud-neck cytokinesis site — The bud neck is the mother-bud cortical region where the septin ring assembles to organize budding-yeast cytokinesis.
- GO:0005935 GO:0005935 identifies the cellular bud neck.
- DOI:10.3389/fcell.2016.00123 Glomb and Gronemeyer 2016 review septin organization and cytokinesis functions at the budding-yeast bud neck.

The cellular bud neck is the mother-daughter constriction where the budding-yeast septin ring assembles.

Subject	Predicate	Object	Evidence
cellular bud neck	is part of	cellular bud	`GO:0005935` GO:0005935 identifies the cellular bud neck. `uniprot.location:SL-0029` — Bud neck UniProt SL-0029 places the bud neck under the Bud location.
septin ring	assembles at	cellular bud neck	`DOI:10.1534/genetics.107.073007` Iwase et al. 2007 studied the budding-yeast septin ring formed by Cdc3/Cdc10/Cdc11/Cdc12/Shs1. `DOI:10.3389/fcell.2016.00123` Glomb and Gronemeyer 2016 review septin organization at the budding-yeast bud neck.

INTERPRETATION (RESOLVED): Keep septin and polarisome proteins on their own structure records rather than duplicating them as cellular bud neck components. GO:0005935 and UniProt SL-0029 identify the mother-daughter neck region. The septin ring and bud-neck polarisome are localized substructures, so this regional record links the septin ring by has_part and leaves septin or polarisome protein constituents on their own records.

GO:0005935 Gene Ontology cellular-component term for the cellular bud neck.
GO:0005933 Gene Ontology cellular-component term for the cellular bud.
GO:0005940 Gene Ontology cellular-component term for the septin ring.
uniprot.location:SL-0029 — Bud neck UniProt Subcellular Location entry SL-0029 maps Bud neck to GO:0005935 and places the bud neck under Bud.
uniprot.location:SL-0027 — Bud UniProt Subcellular Location entry SL-0027 maps the parent Bud location to GO:0005933.
DOI:10.1534/genetics.107.073007 Iwase et al. 2007 studied Shs1/Sep7 with the Cdc3, Cdc10, Cdc11, and Cdc12 septins of the budding-yeast septin ring.
DOI:10.3389/fcell.2016.00123 Glomb and Gronemeyer 2016, 'Septin Organization and Functions in Budding Yeast', Frontiers in Cell and Developmental Biology.

2026-09-15T01:03:12Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-15T01:03:42Z codex · EXPANDED_RECORD — Added UniProt bud-neck synonymy and xref, cellular-bud parthood, septin-ring substructure, budding-yeast distribution and example evidence, a bud-neck cytokinesis scaffold function, GO/UniProt/DOI evidence, a nonmechanistic bud-neck septin topology graph, and a septin/polarity-factor component-boundary decision.
2026-09-15T01:23:12Z codex · ADDRESSED_REVIEW — Resolved #913 and #914 by adding the boundary-discussion resolved_date, retitling the bud-neck function as a cytokinesis-site assertion, and removing the over-broad cytokinesis marker edge from the topology graph.