DRC1

Summary: DRC1 contributes the N-DRC structure needed for coordinated ciliary movement.

Reason: PMID:37258679 places human DRC1 in the respiratory-axoneme N-DRC and resolves a conserved mechanoregulatory architecture, with the detailed scaffold contacts determined in algae. Human respiratory phenotypes in PMID:23354437 independently demonstrate altered bending and beat frequency after DRC1 loss. Structural coupling is participation in movement; this does not assign DRC1 dynein motor catalysis.

Summary: The PAINT inference of ciliary-movement regulation is supported by conserved N-DRC structural function.

Reason: The literal IBD is at PTN000492844, the DRC1/DRC2 family root, and the human DRC1 leaf descends through the DRC1 branch. Its aligned 740-residue sequence matches the official product. The DRC2/zebrafish descendant evidence is not treated as a pairwise transfer or weakened by donor count. Independent human DRC1 beating phenotypes and structural placement support the inherited regulatory role. The exact DRC2 paper is not independently re-read here.

Summary: Refine the positive association with DRC4/GAS8 to cytoskeletal protein binding.

Reason: GO:0008092 covers binding to a protein component of the cytoskeleton. DRC4/GAS8 (O95995) is independently established as a coiled-coil scaffold subunit of the N-DRC: human Supplementary Table 3 of PMID:37258679 places this exact 478-residue accession in the axonemal N-DRC, consistent with its curated structural function. PMID:34169321 reports controlled HA-DRC1/Flag-DRC4 co-immunoprecipitation, and the imported UniProt-curated human pair supports the positive binding assertion. The partner class warrants this refinement without requiring a purified interface or a separate demonstration of native downstream function. Co-IP nevertheless demonstrates association rather than purified direct contact; the original main methods and supplement do not authenticate transfected ORF species or exact sequence. The refinement preserves the gene-level source assertion and does not claim all-isoform equivalence, motor catalysis or a scaffold activity for each individual pair.

Proposed replacements: cytoskeletal protein binding

Summary: Refine the positive association with DRC5/TCTE1 to cytoskeletal protein binding.

Reason: GO:0008092 covers binding to a protein component of the cytoskeleton. DRC5/TCTE1 (Q5JU00) is independently established as a structural subunit of the N-DRC linker: human Supplementary Table 3 of PMID:37258679 places this exact 501-residue accession in the axonemal N-DRC, consistent with its curated structural function. PMID:34169321 reports controlled HA-DRC1/Flag-DRC5 co-immunoprecipitation, and the imported UniProt-curated human pair supports the positive binding assertion. The partner class warrants this refinement without requiring a purified interface or a separate demonstration of native downstream function. Co-IP nevertheless demonstrates association rather than purified direct contact; the original main methods and supplement do not authenticate transfected ORF species or exact sequence. The refinement preserves the gene-level source assertion and does not claim all-isoform equivalence, motor catalysis or a scaffold activity for each individual pair.

Proposed replacements: cytoskeletal protein binding

Summary: Refine the positive association with DRC2/CCDC65 to cytoskeletal protein binding.

Reason: GO:0008092 covers binding to a protein component of the cytoskeleton. DRC2/CCDC65 (Q8IXS2) is independently established as a coiled-coil scaffold subunit of the N-DRC: human Supplementary Table 3 of PMID:37258679 places this exact 484-residue accession in the axonemal N-DRC, consistent with its curated structural function. PMID:34169321 reports controlled HA-DRC1/Flag-DRC2 co-immunoprecipitation, and the imported UniProt-curated human pair supports the positive binding assertion. The partner class warrants this refinement without requiring a purified interface or a separate demonstration of native downstream function. Co-IP nevertheless demonstrates association rather than purified direct contact; the original main methods and supplement do not authenticate transfected ORF species or exact sequence. The refinement preserves the gene-level source assertion and does not claim all-isoform equivalence, motor catalysis or a scaffold activity for each individual pair.

Proposed replacements: cytoskeletal protein binding

Summary: Refine the positive association with DRC3/LRRC48 to cytoskeletal protein binding.

Reason: GO:0008092 covers binding to a protein component of the cytoskeleton. DRC3/LRRC48 (Q9H069) is independently established as a structural subunit of the N-DRC: human Supplementary Table 3 of PMID:37258679 places this exact 523-residue accession in the axonemal N-DRC, consistent with its curated structural function. PMID:34169321 reports controlled HA-DRC1/Flag-DRC3 co-immunoprecipitation, and the imported UniProt-curated human pair supports the positive binding assertion. The partner class warrants this refinement without requiring a purified interface or a separate demonstration of native downstream function. Co-IP nevertheless demonstrates association rather than purified direct contact; the original main methods and supplement do not authenticate transfected ORF species or exact sequence. The refinement preserves the gene-level source assertion and does not claim all-isoform equivalence, motor catalysis or a scaffold activity for each individual pair.

Proposed replacements: cytoskeletal protein binding

Summary: A curated mouse cytosol annotation is traceable, but its target-specific localization evidence remains unresolved.

Reason: The transferred mouse Drc1 product Q3USS3 carries a direct-assay cytosol annotation from PMID:27914912. Its accessible abstract concerns FOXJ1-dependent ciliogenesis and does not expose the Drc1 localization experiment; bounded full-text attempts did not recover that experiment. The inspected human sources establish axonemal and other cell-context locations, not a clearly demonstrated diffuse soluble cytosolic pool. This is an access and transfer-resolution limit, not a claim that the mouse annotation is erroneous or that human DRC1 cannot occur in cytosol.

Summary: Refine motor-dynein-complex membership to the axonemal nexin link/N-DRC.

Reason: The current IPR039750 mapping genuinely emits GO:0005858, whose definition is a dynein motor complex. DRC1 instead forms the coiled-coil scaffold of the distinct interdoublet nexin-dynein regulatory complex, represented by GO:0005931. Human Table 3 in PMID:37258679 explicitly places Q96MC2 in N-DRC, separately from ODA and IDA subunits; the algal structural model resolves the scaffold arrangement. This corrects complex identity without denying DRC1 regulation of, or structural support for, dynein motors.

Proposed replacements: axonemal nexin link

Summary: Ciliary localization is established, with source-specific compartments retained.

Reason: The mouse donor Q3USS3 carries experimental ciliary localization from PMID:34169321, and human respiratory-axoneme evidence independently supports DRC1 in cilia. Current human HPA metadata additionally reports a primary-cilium transition-zone pool in cultured cells, using one antibody without independent pixel scoring here. The broad cilium annotation should not be replaced by an exclusive motile-axoneme location that would discard this distinct observed context.

Summary: The ancestral axoneme-location assertion is directly corroborated in human DRC1.

Reason: PTN000492844 carries the literal axoneme IBD and is an ancestor of the exact human target leaf. The Q384U1/CMF70 donor has directly inspected trypanosome endogenous-locus HA tagging, biochemical fractionation and flagellar immunofluorescence in PMID:20876659. Q32KY1 is the bovine DRC1 record, not an algal accession; its current curated annotation is retained without an invented bovine assay account. Human DRC1 is explicitly identified in the respiratory-axoneme structural model in PMID:37258679, providing independent target grounding.

Summary: The UniProt subcellular-location mapping to axoneme is correct.

Reason: SL-0304 maps the curated axoneme location. Human respiratory-axoneme structural identification of DRC1/Q96MC2 and the clinical/ortholog localization evidence agree with this compartment. This mapping does not imply that the axoneme is the only cellular pool.

Summary: The bovine-based sequence-similarity location transfer is independently supported in human DRC1.

Reason: The literal donor is bovine Q32KY1, whose current record carries axoneme IDA citing PMID:23354437. The exact bovine assay is not reconstructed from the available consultation, and the donor is not relabeled as algal. Human Q96MC2 is independently listed in the respiratory N-DRC/axoneme structural model and human respiratory evidence establishes the same compartment. Thus the location is accepted without inventing source-specific experimental details.

Summary: Human DRC1 is a constituent of the axoneme.

Reason: PMID:37258679 used human respiratory ALI cultures and isolated axonemes for cryo-EM. Supplementary Table 3 identifies DRC1/CCDC164, Q96MC2, 740 residues within N-DRC. Human model placement combined cryo-EM density with predicted homologous subcomplexes; it is not a purified DRC1 localization assay or a human sperm experiment.

Summary: Human DRC1 is part of the axonemal nexin link/N-DRC.

Reason: The term denotes the protein complex interconnecting adjacent outer microtubule doublets. PMID:37258679 explicitly lists human DRC1 in the N-DRC and resolves the coiled-coil scaffold arrangement in the algal complex. Human clinical loss and ortholog biochemistry in PMID:23354437 independently support N-DRC integrity. This is structural membership of a regulatory link, not autonomous dynein motor activity.

Summary: DRC1 supports sperm flagellar motility through N-DRC and axoneme integrity.

Reason: PMID:37258679 supplies the conserved structural framework from respiratory human and algal axonemes rather than a direct human sperm perturbation. Independent PMID:34169321 documents human MMAF with DRC1 truncating variants and mouse sperm-axoneme disorganization/motility defects. These observations support the gene-level sperm motility role while preserving the different specimens and assay scopes.

Summary: DRC1 contributes structure to axoneme assembly and organization.

Reason: The literal ARBA00045042 rule has an applicable clause for IPR029440, IPR039505 and IPR039750 in the permitted eukaryotic lineage. The rule is independently supported by DRC1 scaffold placement and loss of N-DRC organization. PMID:34169321 shows initially formed mouse spermatid axonemes becoming disorganized, so the biology concerns organized structural integrity as well as assembly and should not be described as a complete failure to initiate axoneme construction.

Summary: Sperm-flagellum localization is supported, with species and assay context kept explicit.

Reason: The mouse donor Q3USS3 has experimental sperm-flagellum evidence from PMID:34169321, whose human MMAF observations independently support the gene-level sperm context. HPA reports no positive staining in its sperm assay using one antibody; this limited negative assay is not proof of absence and does not overrule the primary ortholog/clinical evidence. Human structural evidence in PMID:37258679 is respiratory, not a direct sperm-location measurement.

Summary: The phylogenetic cilium-dependent cell-motility assertion is supported by flagellar propulsion.

Reason: The literal IBD at PTN000492844 includes mouse, trypanosome, human and bovine descendant evidence, and human DRC1 is in its inherited clade. Direct CMF70 RNAi in trypanosomes impairs flagellar propulsion, while human/mouse DRC1 sperm evidence supplies relevant target-lineage cell motility. Respiratory epithelial beating alone would not demonstrate locomotion of the epithelial cell; that distinction does not invalidate the integrated sperm/flagellar role. Target self-inclusion is expected experimental grounding, not circularity.

Summary: Retain the curated motility claim with a clear distinction between respiratory beating and cell propulsion.

Reason: The direct human experiments in PMID:23354437 quantify respiratory ciliary bending/beat behavior; they do not show epithelial-cell locomotion. Nevertheless, DRC1 structural participation in flagellum-driven cell motility is independently supported by human MMAF and mouse sperm motility in PMID:34169321, alongside conserved flagellar propulsion in PMID:20876659. Accept the gene-level curated assertion while making the original specimen and endpoint limits explicit.

Summary: DRC1 participates structurally in assembly and integrity of the N-DRC protein complex.

Reason: ARBA00029057 has a literal target-matching InterPro clause. The N-DRC scaffold positions other subunits; DRC1 loss alters their retention and the organization of the native complex. This is a structural contribution to complex formation/organization, not merely a downstream phenotype or a claim that DRC1 is an autonomous assembly enzyme. The broader complex-assembly annotation remains biologically appropriate to the same structural unit.

Summary: Retain the inherited contribution to selective axonemal dynein assembly.

Reason: The literal PTN000492844 IBD is grounded by experimental DRC1 annotations, including the target itself. PMID:23354437 directly shows selective inner-arm/associated component losses in algal DRC1-null axonemes, with structural N-DRC participation supplying a mechanism. Gross human respiratory dynein arms and tested markers can remain, and PMID:37258679 explicitly leaves human IDAe docking dependence unresolved; neither observation establishes loss of the conserved contribution. Retain the curated inference without claiming universal dynein-arm loss, direct motor catalysis or an independently resolved human docking reaction.

Summary: The family-based dynein-assembly contribution is supported with selective and species-specific limits.

Reason: IPR039750 genuinely maps to GO:0070286. Unlike motor-complex membership, participation in motor assembly can be mediated by the adjacent N-DRC scaffold. The algal DRC1-null evidence in PMID:23354437 shows loss of selected inner-arm components, while human respiratory gross arm structure can persist and mouse mature sperm defects differ. The current evidence supports the curated contribution without asserting direct DRC1 motor activity or universal human arm-assembly failure.

Summary: Retain the curated experimental dynein-assembly contribution with the original species distinction.

Reason: PMID:23354437 demonstrates selective inner-arm assembly/retention defects in algal DRC1-null axonemes, whereas its human respiratory cilia retain gross dynein arms, DNALI1 and CCDC39. These human observations do not exclude subtle or context-dependent assembly contributions. Conserved N-DRC structural participation and the distinct mouse sperm phenotype in PMID:34169321 support the gene-level curated process. Accept with curator deference and the explicit limit that the inspected human experiments do not establish wholesale arm loss or a specific human IDAe docking reaction.