E2F family
Enable an agent to identify E2F-family transcription factors, assess their context-dependent regulatory state, and judge which functional interpretations or experimental actions the evidence supports.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 14 findings · 23 questions
Family identity and boundaries Establishes what the E2F entry denotes and how individual observations map into it.
Taxonomic membership
Resolves the organism and evidence supporting inclusion in the E2F family.
Member assignment
An E2F assignment should identify a protein sequence and taxon and distinguish family membership from similarity to related DP proteins.
- Which organism, gene, protein accession, and sequence version does this E2F designation identify? definition
- Which curated annotation or sequence analysis supports E2F membership rather than only an E2F/DP-like domain assignment? provenance
Member and family resolution
Preserves the resolution of names, reagents, and measurements.
Isoform and signal specificity
Member-specific proteins, isoforms such as mammalian E2F3a and E2F3b, and aggregate E2F readouts require distinct interpretation.
- Does the observation resolve a particular E2F member and isoform, or only a pooled family signal? boundary
- What sequence coverage or reagent validation establishes the claimed member or isoform specificity? provenance
DNA recognition and partners Connects E2F architecture to DNA-binding behavior and complex composition.
Binding architecture
Records DNA-binding domains and the functional role of DP proteins.
Typical and atypical binding
Structural evidence distinguishes typical E2F-DP DNA recognition from atypical tandem-domain recognition; partner dependence must be assigned at member level. [Structural study](https://pmc.ncbi.nlm.nih.gov/articles/PMC4686757/)
- Does the identified protein have a typical or atypical E2F DNA-binding architecture? definition
- Has DNA binding been measured with and without the relevant DP partner under comparable conditions? measurement
Sequence and chromatin recognition
Separates sequence compatibility, biochemical binding, and occupancy in cells.
Binding-site evidence
A candidate E2F motif, binding to an isolated DNA fragment, and occupancy of a genomic locus are different evidence types.
- Which sequence or genomic interval is implicated, and is the evidence motif prediction, biochemical binding, or cellular occupancy? provenance
- What controls distinguish member-specific occupancy from background, reagent cross-reactivity, or indirect recruitment? measurement
Regulatory state in cells Describes the context and interactions needed to interpret an E2F's regulatory activity.
Regulatory complexes
Resolves pocket-protein associations and alternative repression mechanisms.
Member-specific repression
E2F6 experiments demonstrated repression without the pocket-protein-binding region characteristic of previously identified E2Fs, requiring the model to distinguish alternative regulatory mechanisms. [E2F6 study](https://pubmed.ncbi.nlm.nih.gov/9501179/)
- Which DP, pocket-protein, or other regulatory partners are experimentally associated with this E2F in the sampled cells? measurement
- What perturbation supports a functional role for those partners in activation or repression? provenance
Phase, localization, and stimulus
Anchors E2F observations to cell state and time.
Contextual activity state
E2F activity should be assessed using matched measurements of expression, protein availability, localization, and target response in a defined cellular condition.
- What cell type, cell-cycle distribution, stimulus, and sampling time accompany the observation? boundary
- Do protein localization and target-response measurements support the activity inferred from E2F RNA or protein abundance? measurement
Targets, perturbations, and outcomes Establishes how strongly E2F observations support direct regulation and downstream biological effects.
Direct target assessment
Combines binding and response evidence without treating either as sufficient alone.
Target causality
A direct-target claim requires evidence connecting the specified E2F to locus regulation while addressing secondary responses and changing cell-cycle composition.
- Does member-specific occupancy coincide with a timely target-expression response to E2F perturbation in the same biological context? measurement
- Would binding-site alteration, acute perturbation, or rescue resolve the remaining uncertainty about direct regulation? action
Functional effects and compensation
Assesses phenotypes while accounting for overlapping E2F functions and experimental scope.
Member versus combined effects
Combined E2F7/E2F8 disruption in mice revealed functions that require joint member assessment; such findings justify checking compensation without assuming the same effect in every system. [Mouse genetic study](https://pmc.ncbi.nlm.nih.gov/articles/PMC2253677/)
- Which measured outcome changes after single-member versus combined perturbation, and were other E2Fs monitored? measurement
- What rescue or independent perturbation would distinguish an E2F-dependent effect from off-target effects or overexpression artifacts? action
- Which organism, tissue, developmental stage, and perturbation limits constrain transfer of this result? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these check these first hold for the sense of E2F family this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these kinds and varieties hold for the sense of E2F family this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these identifiers and schemes hold for the sense of E2F family this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these real-world use hold for the sense of E2F family this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these failure modes and hazards hold for the sense of E2F family this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of E2F family this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- Transcription factor E2F6
What it is Filled
The E2F family is a group of sequence-specific transcription factors that regulate gene expression involved in cell-cycle progression, DNA replication, DNA repair and other cellular processes.
In scope
- E2F-family membership resolved by organism, gene, protein sequence, and isoform
- DNA-binding architecture and distinctions between typical and atypical E2Fs
- DP partnerships, pocket-protein interactions, and other regulatory complexes
- Expression, localization, and transcriptional activity in a specified cellular context
- Evidence linking individual E2Fs to target regulation and cellular outcomes
Out of scope
- DP-family proteins and retinoblastoma-family proteins as independently modeled entities
- The complete cell-cycle, DNA-repair, or apoptosis machinery
- E2F-binding DNA elements and target genes as independent entities
- Cancer diagnoses, patient prognosis, and treatment recommendations
- Commercial antibodies, expression vectors, and purified protein preparations as products
- Family-wide CAS identifiers, purity grades, melting points, or hazard classifications
Why it exists Filled
Enable an agent to identify E2F-family transcription factors, assess their context-dependent regulatory state, and judge which functional interpretations or experimental actions the evidence supports.
Distinguishing features Filled
- The entry denotes a transcription-factor family, not one chemical substance, one gene, or a measured E2F activity signature.
- Membership requires sequence and evolutionary evidence for an E2F protein; an E2F-binding motif in DNA identifies a possible regulatory site, not a family member.
- Typical mammalian E2F1-E2F6 preferentially bind DNA with DP partners, whereas atypical E2F7 and E2F8 contain two DNA-binding domains and can bind independently of DP. [Structural study](https://pmc.ncbi.nlm.nih.gov/articles/PMC4686757/)
- DP proteins are related interaction partners and must be distinguished from E2F members even when domain annotations group them together.
- An activator or repressor label alone cannot establish member identity or activity in a particular cell; complex composition and experimental context must also be resolved.
What robots and AI may and may not do Filled
Must not
- Present research on E2F factors as an approved cancer treatment or test.
- Diagnose cancer or predict a person's prognosis from gene data.
- Disclose a person's genetic or tumour test results without consent.
Only with a human decision
- Any clinical decision that draws on tumour gene expression results.
May
- Describe the E2F family and its role in the cell cycle from reliable sources.
- Summarize published research on E2F factors with citations and dates.
Moral aspects Filled
- Cancer research raises hopes, so overstated findings can mislead patients.
- Genetic and tumour data are sensitive health information.
Who is affected
- Cancer patients and families
- Researchers
- Clinicians
Owners Filled
Steward
Nobody owns the protein family; it is a natural component of cells.
Links to other meta-models Filled
parent
- Q8054 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.e2f-family
- Wikidata: Q24771933 (https://www.wikidata.org/wiki/Q24771933)
Direct properties required Filled
- Taxon and member identity: Organism identifier, approved gene symbol, protein accession, and isoform
- DNA-binding architecture: Typical single E2F DNA-binding domain; atypical tandem domains; unresolved
- DP partnership: Named DP partner, interaction evidence, and demonstrated dependence or independence
- Pocket-protein association: RB1/pRB, RBL1/p107, RBL2/p130, or another explicitly identified partner; detected, not detected, or untested
- Cellular context: Cell type, cell-cycle phase, differentiation state, stimulus, and sampling time
- Member abundance: RNA abundance or protein abundance, with assay-specific units and normalization
- Subcellular localization: Nuclear, cytoplasmic, mixed, or unresolved; quantitative fraction when measured
- Target occupancy: Genomic interval, genome assembly, assay, and normalized enrichment or binding affinity
- Regulatory effect: Target-expression change, such as log2 fold change, with perturbation, time point, and uncertainty
- Evidence status: Sequence inference, biochemical binding, cellular occupancy, perturbation response, rescue-supported effect, or unresolved
Recognition not applicable Not applicable
Not applicable
E2F family membership has no directly visible distinguishing appearance and requires molecular characterization.
Capabilities and actions required Filled
- Resolve an E2F mention to a species-specific member or retain it explicitly at family level.
- Compare member architectures and select appropriate partner-dependent or partner-independent binding assays.
- Assess whether abundance, localization, and complex composition support a proposed regulatory state.
- Evaluate candidate direct targets using occupancy and perturbation evidence together.
- Design member-specific perturbation and rescue comparisons that account for compensating E2Fs.
- Flag unsupported transfers from one member, tissue, organism, or experimental system to another.
Hazards and failure modes required Filled
- Faulty control of E2F activity is linked to uncontrolled cell growth in cancer.
Standards and interfaces required Filled
- The InterPro protein family classification, maintained by the European Bioinformatics Institute of the European Molecular Biology Laboratory with its partner databases, applies to E2F family annotation.
Context of use required Filled
- E2F-family transcription factors are studied in molecular and cell biology to understand regulation of cell-cycle progression and DNA-related processes.
- Their activity is investigated in developmental and disease research using evidence about family membership, binding partners and cellular context.
Sources Filled
- Wikidata item Q24771933: E2F family - identity and sense of the item
- Wikipedia: E2F - general description of the item
Open questions
- Does vr.tr.e2f-family intend the human family, mammalian E2Fs, or E2F homologs across broader eukaryotic lineages?
- Does an existing Vercy world model already own E2F-family identity or the same concept under another name?
- Which curated membership and isoform references should define the initial species-specific coverage?
- Which member-partner interactions and direct targets have sufficient context-matched evidence for inclusion beyond the initial structural distinctions?
- What minimum experimental evidence should permit an agent to assign active, repressive, or functionally compensated states?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q24771933/spec.json