new mitotic spindle pole body

GO:0071958 · Cytoskeleton · Multiprotein complex · Proposed

The spindle pole body that is formed by spindle pole body duplication, and to which proteins involved in mitotic exit signaling (for example, the septation initiation network in fission yeast) localize. [GO:0071958]

Synonyms: new SPB

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

Taxonomic distribution

• NCBITaxon:4896 Schizosaccharomyces pombe — COMMON: Fission yeast is the model in which new and old mitotic spindle pole bodies were distinguished during asymmetric mitotic-exit signaling; no broader fungal distribution is asserted here. [DOI:10.1101/gad.296204]

Canonical examples

• NCBITaxon:4896 Schizosaccharomyces pombe — Reference fission-yeast system used to define the newly duplicated mitotic SPB as the pole that localizes septation-initiation network proteins. [DOI:10.1101/gad.296204]

Discussions

• INTERPRETATION (RESOLVED): Keep the GO age/asymmetry term for the new mitotic SPB narrower than the general mitotic SPB and distinct from local old/new SPB duplication placeholders. GO:0071958 denotes the newly formed mitotic spindle pole body that localizes mitotic-exit signaling proteins, whereas GO:0044732 denotes the broader mitotic SPB. The older ungrounded old_spb and new_spb causal-graph nodes on the general SPB record are generic duplication roles and are not exact records for the fission-yeast GO:0071957 and GO:0071958 age/asymmetry terms.
• CURATION_TODO (OPEN): Resolve exact source-neutral family groundings and scope for fission-yeast SIN and NIMA-related proteins at the new mitotic SPB. This first GO-backed record captures the new mitotic SPB as an age/asymmetry structure without treating transient fission-yeast-specific signaling proteins as conserved SPB constituents or guessing InterPro, Pfam, NCBIfam, UniProtKB, or Complex Portal groundings.

Evidence

• GO:0071958 Gene Ontology cellular-component term for the new mitotic spindle pole body, with new SPB as an exact synonym.
• GO:0044732 Gene Ontology cellular-component parent term for mitotic spindle pole body.
• GO:0071957 Gene Ontology cellular-component sibling term for the pre-existing old mitotic spindle pole body.
• DOI:10.1101/gad.296204 Grallert et al. 2004 analyzed fission-yeast spindle-pole-body maturation and SIN/NIMA signaling asymmetry.

Curation history

• 2026-09-29T17:21:42Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
• 2026-09-29T17:23:27Z codex · EXPANDED_RECORD — Added the GO exact synonym, mitotic-SPB parentage, Schizosaccharomyces scope, GO and fission-yeast literature evidence, and boundary/component discussions for the new mitotic spindle pole body.

Source: data/structures/cytoskeleton/new_mitotic_spindle_pole_body.yaml