nuclear lumen

GO:0031981 · Membrane organelle · Subcellular region · Proposed

The volume enclosed by the nuclear inner membrane. [GO:0031981]

Part of: nucleus (GO:0005634)

Components

Component	Type	Part of / acts on	Grounding	Genes	Stoichiometry	Essential	Role
nuclear chromosome	Other	part of	`GO:0000228`				Chromosome structure that encodes the eukaryotic nuclear genome inside the nuclear lumen. `GO:0000228` GO:0000228 identifies nuclear chromosomes as chromosomes that encode the nuclear genome and are part of the nuclear lumen. `DOI:10.1038/nature08973` Duan et al. 2010 modeled the three-dimensional organization of the Saccharomyces cerevisiae nuclear genome.
nucleolus	Other	part of	`GO:0005730`				Dense nuclear body that concentrates ribosomal DNA transcription, pre-rRNA processing, and early ribosomal subunit assembly in the nuclear lumen. `GO:0005730` GO:0005730 defines the nucleolus as part of the nuclear lumen. `DOI:10.1038/nrm2184` Boisvert et al. 2007 review the nucleolus as a nuclear body organized around ribosome biogenesis.

nuclear lumen compartmentalization — The nuclear lumen is the nucleus-internal volume that contains nuclear chromosomes and nuclear bodies such as the nucleolus.
- GO:0031981 GO:0031981 defines the nuclear lumen as the volume enclosed by the nuclear inner membrane.
- GO:0000228 GO places nuclear chromosomes in the nuclear lumen during cell-cycle phases when the nucleus is intact.
- GO:0005730 GO places the nucleolus in the nuclear lumen.

The nuclear inner membrane delimits the nuclear lumen, and the nuclear lumen contains nuclear chromosomes and the nucleolus.

Subject	Predicate	Object	Evidence
nuclear inner membrane	delimits	nuclear lumen	`GO:0031981` GO:0031981 defines the nuclear lumen by the volume inside the nuclear inner membrane.
nuclear lumen	is part of	nucleus	`GO:0031981` GO models the nuclear lumen as an internal compartment of the nucleus.
nuclear chromosome	is located in	nuclear lumen	`GO:0000228` GO:0000228 places nuclear chromosomes in the nuclear lumen.
nucleolus	is located in	nuclear lumen	`GO:0005730` GO:0005730 places the nucleolus in the nuclear lumen.

INTERPRETATION (RESOLVED): Should nucleoplasm be added as an exact synonym of nuclear lumen? This record follows GO:0031981 for the whole inner-membrane-enclosed nuclear volume and grounds contained nucleolar and chromosomal substructures separately. No exact synonymy between nuclear lumen and nucleoplasm was verified in this pass.
CURATION_TODO (OPEN): Resolve remaining nuclear-lumen bodies and substructures before expanding the component list. This first nuclear-lumen record grounds the nuclear chromosome and nucleolus because existing CellStructureMech records already curate their GO boundaries, but GO:0031981 can contain additional nuclear bodies and subregions whose exact GO and literature boundaries need separate review.

GO:0031981 Gene Ontology cellular-component term for nuclear lumen.
GO:0070013 Gene Ontology cellular-component parent term for intracellular organelle lumen.
GO:0005634 Gene Ontology cellular-component term for the containing nucleus.
GO:0005637 Gene Ontology cellular-component term for the bounding nuclear inner membrane.
GO:0000228 Gene Ontology cellular-component term for nuclear chromosome.
GO:0005730 Gene Ontology cellular-component term for nucleolus.
DOI:10.1038/nature08973 Duan et al. 2010, A three-dimensional model of the yeast genome, Nature.
DOI:10.1038/nrm2184 Boisvert et al. 2007, The multifunctional nucleolus, Nature Reviews Molecular Cell Biology.

2026-09-15T23:52:58Z codex · CREATED_RECORD — Scaffolded by scripts/new_record.py
2026-09-15T23:54:21Z codex · EXPANDED_RECORD — Added intracellular-organelle-lumen parentage, nucleus parthood, nuclear-chromosome and nucleolus components, a nuclear-lumen topology graph, and a resolved nucleoplasm boundary interpretation.
2026-09-15T23:54:59Z codex · TIGHTENED_BOUNDARY_DISCUSSION — Reworded the resolved nucleoplasm discussion to avoid an unsupported claim that nucleoplasm is narrower than GO:0031981.
2026-09-16T00:05:51Z codex · ADDRESS_REVIEW — Resolved #1041 by adding an open TODO for remaining nuclear-lumen substructures beyond the seeded nuclear chromosome and nucleolus.