ARMC9 research notes

Initial manual research, 2026-09-28

The starting normal seed contains 22 unique GO assertions and two alternative products for human Q7Z3E5. The raw UniProt record, GOA file, four normal publication caches and seeded review were preserved before research. The review remains INITIALIZED with all decisions PENDING during prospective consultation. One configured Falcon deep-research attempt with the configured fallback failed after 4.155 seconds with connection/timeout indicators and no report; these are manual research notes, not a generated provider report. No verified seeded input was fetched again.

ARMC9 is an 818-residue LisH/armadillo-repeat protein that organizes a ciliary protein interaction network. Human cell localization places it at the basal body and daughter centriole; mammalian ciliary localization is dynamic, with Hedgehog-dependent tip enrichment in the mouse cell systems studied. Its partners include TOGARAM1, CSPP1 and CCDC66. The strongest mechanistic evidence now distinguishes its structural contribution to a complex from autonomous microtubule binding or polymerase activity. Biallelic variants cause Joubert syndrome 30, with the characteristic hindbrain malformation and variable neurological, ocular and other ciliopathy features. No enzyme activity is inferred from altered tubulin modifications, mitochondrial phenotypes, or association with an enzyme/assembly factor.

Source-specific reading

The two additional papers, 29459677 and 39856351, are absent from the normal canonical cache. A single normal two-ID batch was interrupted at 45.040 seconds, exit -15, with zero output cache files. This was one interrupted batch, not two completed individual failures. The exact receipt and independent primary-identity/abstract consultation are preserved under tmp/ARMC9-initial. They are proposed for the finite Source44 recovery; no retry was made. External reading does not change canonical availability flags.

Annotation and core-function reasoning before authorship

The existing cilium-assembly and basal-body/centriole assertions are consistent with the human localization, patient-cell phenotypes and conserved ciliary role. Human evidence supports the truth of these assertions independently of a full reconstruction of the PAINT ancestral node. The target appearing in the IBA donor list is expected, not circular; no donor-count argument is used. No exact PTN000382362 topology has been independently reconstructed. The ciliary-tip location is retained with its conditional mouse-cell/ortholog-transfer scope. The Smoothened-pathway process is retained as a downstream signaling context rather than expanded to an intrinsic signaling enzyme or a new BP.

Positive binding assays remain valid under the user's ActionEnum. A true interaction does not become REMOVE solely because GO:0005515 is broad. Source-local uncertainty is retained when the precise experiment is unadjudicated. For the 2020 TOGARAM1 row, whether its two-TOG-domain-region mapping justifies GO:0019904 is explicitly submitted for independent consultation; the newer isolated TOG2 result will not be silently attributed to the older IPI row.

One candidate NEW molecular function is GO:0140378 protein complex scaffold activity, anchored to the 2025 reconstitution and distinct binding regions, with the 2020 module study as corroboration. The official definition is a structural activity of an integral component holding a protein complex together, under structural molecule activity. GO:0030674's own comment directs protein-complex scaffolds to GO:0140378. This is a proposed mechanistic activity, not a new process inferred merely from knockout/rescue. A tentative single core would connect that activity to existing cilium assembly and basal-body/ciliary-tip locations, while retaining explicit uncertainty about transfer of the detailed tip reconstitution mechanism to the basal-body pool. No new BP or molecular activity of tubulin modification, mitochondrial metabolism, microtubule binding/polymerization, or motor transport is proposed. Existing identical-protein binding records the oligomerization component; the core need not list it redundantly as a second independent activity.

Official terms actually inspected: GO:0140378, GO:0030674 and GO:0019904. The local GO-CAM index search found no Q7Z3E5/ARMC9 hit. Neither this absence nor absence of a NEW process annotation is treated as a curation gap. Both supplied alternative-product objects will be retained; tagged fragments or canonical constructs do not establish isoform-exclusive function.

Open mechanistic questions include the physiological composition and stoichiometry of the ARMC9 module at basal bodies versus ciliary tips, how NDUFAF2 association connects mitochondrial state to ciliary structure, and which assay conditions explain the differing CEP104 co-IP observations.

Authored draft after independent prospective consultation

The initial research statements above describe the pre-authorship state. The independent all22 consultation supported 14 ACCEPT, six KEEP_AS_NON_CORE and two UNDECIDED decisions; these are now authored with all source objects and both alternative products preserved. The 2020 two-domain TOGARAM1 mapping remains non-core, and the unresolved 2024 pair remains uncertain. The organizing network is flexible rather than a fixed-stoichiometry assembly, and ARMC9 has no autonomous microtubule-binding activity in the tested reconstitution. The agreed GO:0140378 molecular-function proposal and detailed source attachments will be added after the two Source44 normal records are recovered and inspected. No new biological process is proposed. This draft is not COMPLETE.

Actual Source44 closure and final biological review

The earlier pending-source statements are historical. Both requested normal records were recovered as complete XML and imported as exact archive bytes after the separate validator and identity checks. Existing source caches and raw inputs remain unchanged. The current review contains all 22 original assertions (14 ACCEPT, six KEEP_AS_NON_CORE and two UNDECIDED), plus one NEW molecular function; no new biological process is proposed.

For PMID:29459677, the actual ARMC9 Results, relevant Discussion, cell culture, general cloning, stable-cell, reporter/localization and fluorescence-quantification Methods were read. The experiment uses mouse NIH-3T3 and IMCD3 cells. General cloning allows mouse cDNA or commercial sources, leaving the particular tagged ARMC9 sequence origin unresolved. ARMC9-FLAG accumulates toward the tip after Hedgehog stimulation and later returns; mutant cells have shorter cilia and altered tubulin-modification levels. GLI2/GLI3 accumulation is affected without the same SMO effect. These data support the existing ortholog-transfer/contextual annotations, not direct motor or SMO-binding activity. The earlier external Figure5 caption read remains separate from this actual main-body read. [PMID:29459677, "Armc9 mutant NIH-3T3 cells exhibited reduced ciliary accumulation of GLI2 and GLI3 (but not SMO) upon pathway activation"]

For PMID:39856351, actual ARMC9/domain/recruitment and module Results, Figure5–7 captions, relevant Discussion, DNA constructs, co-IP, purification/SEC/MS and microtubule-reconstitution Methods were read. Human ARMC9 was expressed in HEK293T, with mouse TOGARAM1 and porcine brain tubulin in the mixed reconstitution. Distinct ARMC9 surfaces bind TOGARAM1 and CSPP1; partner recruitment and modest dynamic effects support GO:0140378 protein complex scaffold activity. This supplies a structural contribution, rather than inferring a process solely from perturbation. It is not autonomous microtubule binding or tubulin-polymerase activity. Single-component omissions, double ARMC9/CCDC66 omission and component-ratio changes support a flexible, partly redundant network, not an obligatory stoichiometric complex. [PMID:39856351, "ARMC9 can bind to both proteins through two distinct domains and mildly enhance their effects on MT dynamics"]

The 2025 weak CEP104 co-IP nonreplication is retained beside the older positive record, without declaring the original experiment incorrect. Older generic IPI assertions do not inherit newer fine-mapping assays. The uninspected 2024 TOGARAM1 blot and urinary-exosome target evidence remain UNDECIDED. Complete supplements, raw data and figure pixels were not exhaustively inspected. The independent prospective consultation approved this bounded new scaffold assertion; final authored consultation and validation are recorded separately.

Follow-up to PR #3371: interaction mechanism and location

The published review and history remain the historical baseline. This follow-up retains all 22 original annotation objects and changes one original decision: the 2020 TOGARAM1 interaction is refined to GO:0019904 protein domain specific binding. The single author-added 2025 assertion is conservatively represented as GO:0030674 protein-macromolecule adaptor activity; this replaces the earlier scaffold term and does not add a second NEW annotation or a process annotation.

The original 2020 Figures 1 and 3 map ARMC9 binding to the TOGARAM1 N-terminal TOG1/TOG2 fragment; R368W and L375P in TOG2 disrupt association, whereas R1311C in TOG3 retains it. These experiments support domain-specific recognition without proving an isolated TOG2 interface.

The external original 2020 Results and Figures 1 and 3 were inspected for that conclusion. The normal PMID:32453716 cache remains abstract-only. Human reference constructs, retinal yeast two-hybrid screening, tagged co-immunoprecipitation and forced PalmMyr targeting have their distinct experimental scopes. The newer 2025 TOG2 fine mapping is independent evidence and is not attributed to the 2020 experiment.

The actual PMID:39856351 text reports distinct ARMC9 regions for TOGARAM1 and CSPP1 interactions, partner-dependent recruitment and modulation of microtubule dynamics. The reconstitution combines human ARMC9 with mouse TOGARAM1 and porcine tubulin. H-region-dependent dimerization is demonstrated, but TOGARAM1 binding maps independently of H; dimerization is not established as necessary for every bridge. Whole-module cryo-electron tomography does not assign ARMC9 an integral structural position. The authors' scaffold interpretation remains plausible. Variable stoichiometry and the mild single-deletion effect do not independently disprove scaffold activity. FRAP measures CEP104 turnover, not ARMC9 or turnover of the whole assembly.

Current GO:0030674, GO:0140378 and GO:0019904 definitions and relevant comments were inspected. Coordinated recruitment provides positive support for the adaptor assertion. Nonstoichiometry is a limitation, not its positive evidence. A formal location for this specific activity is omitted because its spatial assignment in cells remains unresolved. GO location edges do not require exclusivity. All accepted protein-localization annotations remain, including human basal-body/daughter-centriole and conditional mouse-cell tip observations; those distributions alone do not assign the same activity to every site.

The 2024 human TOGARAM1 construct is documented in Methods, but its pair-labelled blot or supplementary interaction assay remains uninspected. The accessible Figure 3 legend does not resolve those labels; image and PDF access routes did not provide the needed panel. Independent earlier and later interactions establish biological plausibility without verifying this particular IPI experiment. Its decision remains UNDECIDED. The urinary-exosome target identification also remains unresolved.

The explicit user ActionEnum permits KEEP_AS_NON_CORE for true interactions and defines REMOVE by likely biological error. It takes precedence over the skill's generic-binding removal default. The positive CCDC66, CEP104, CSPP1 and NDUFAF2 associations therefore remain non-core where their own source does not justify a more specific activity. The CEP104 discrepancy is retained. This policy choice is documented here rather than repeated in each biological reason.

Independent prospective consultation agreed with these changes and the stated construct, domain and location limits. Raw source files, all six normal publication caches and the original history are unchanged.

2026-10-01 UTC — Binding-policy clarification

The review of PR #3371 at c097efb09 correctly identifies the repository default: an uninformative generic binding annotation can be excluded even when its reported interaction is real. That informational-exclusion criterion is distinct from concluding that the experimental evidence is false. The earlier notes should not be read as saying that the default policy requires biological falsity or that these touched annotations qualify for a legacy exception.

This task explicitly directs that generic binding not be removed solely for informativeness, while preserving uncertainty when the relevant experiment cannot be adjudicated. The retained decisions are a scoped application of those task instructions. They are not a claim of compliance with the default generic-binding policy, a global policy revision, or a reason to silence its advisory warnings.

The four retained source-specific associations concern CCDC66, CEP104, CSPP1 and NDUFAF2. The CEP104 nonreplication remains explicit, and NDUFAF2 association does not assign mitochondrial respiratory chemistry to ARMC9. The separately supported 2025 adaptor assertion remains a single NEW annotation; its reconstitution and recruitment evidence is not described as having been measured by every older IPI source. The 2020 TOGARAM1 domain-specific refinement is preserved. No original assertion acquires a new replacement solely to resolve the policy disagreement. The uninspected 2024 TOGARAM1 target assay and urinary-exosome identification remain UNDECIDED.

This addendum changes only the explanation of the decision. It adds no primary-source reading, assay verification, quotation, annotation or core function. All current annotation decisions, products, evidence limitations and source objects remain unchanged.