id: Q9W2R4 gene_symbol: insc product_type: PROTEIN status: DRAFT taxon: id: NCBITaxon:7227 label: Drosophila melanogaster description: >- Inscuteable (Insc) is a Drosophila cytoskeletal adaptor/scaffold protein that couples apical-basal cell polarity to mitotic-spindle orientation during asymmetric cell division (ACD) in neural progenitors (neuroblasts) and sensory-organ precursors (pI cells). The protein has an N-terminal disordered region, a central ARM-like repeat region and a conserved Inscuteable C-terminal (Insc_C) domain, but no catalytic domain. Insc localizes to the apical cell cortex from interphase through metaphase, where it acts as a molecular bridge linking the Par complex (Bazooka/Par3-atypical PKC) to the Partner-of-Inscuteable (Pins/raps, the Drosophila LGN ortholog)-Galphai spindle-tethering machinery. Through this bridging activity Insc nucleates an apical protein complex that (i) orients and rotates the mitotic spindle along the apical-basal axis, (ii) directs apical localization of partner proteins, and (iii) is required for basal segregation of cell-fate determinants (Numb, Prospero, Miranda, Staufen) and prospero mRNA into the ganglion mother cell. Insc is thereby required for correct neuroblast sibling-cell fate specification, the glia-neuron cell-fate switch, and normal CNS and peripheral nervous system development; loss of insc (also known as nem) additionally perturbs somatic muscle and other precursor populations that rely on asymmetric division. existing_annotations: - term: id: GO:0045179 label: apical cortex evidence_type: IBA original_reference_id: GO_REF:0000033 qualifier: is_active_in review: summary: Phylogenetic (IBA) annotation placing Insc at the apical cortex, the canonical site of Insc action, corroborated by multiple experimental IDA annotations. action: ACCEPT reason: Insc apical-cortex localization is one of the best-established facts about the protein and is supported by several independent experimental papers as well as this phylogenetic inference. It represents a core aspect of Insc function. supported_by: - reference_id: PMID:11707517 supporting_text: The Inscuteable protein localizes to the apical cell cortex in neuroblasts from interphase to metaphase, but disappears in anaphase. - term: id: GO:0008093 label: cytoskeletal adaptor activity evidence_type: IBA original_reference_id: GO_REF:0000033 qualifier: enables review: summary: Phylogenetic (IBA) annotation of the core molecular function - Insc is a cytoskeletal adaptor that bridges the Par complex to the Pins/Galphai spindle machinery. action: ACCEPT reason: This is the central molecular function of Insc and is directly supported by structural/biochemical work showing Insc is the adaptor bridging Par3 to the spindle-tethering machinery, consistent with the original genetic characterization of Insc as a candidate cytoskeleton adaptor protein. supported_by: - reference_id: PMID:22171003 supporting_text: the adaptor Inscuteable (Insc) bridges between Par3 and the spindle tethering machinery assembled on - reference_id: PMID:8626022 supporting_text: shows certain features common to a family of putative cytoskeletal associated proteins - term: id: GO:0009786 label: regulation of asymmetric cell division evidence_type: IBA original_reference_id: GO_REF:0000033 qualifier: involved_in review: summary: Phylogenetic (IBA) annotation that Insc functions in regulating asymmetric cell division - a core biological process for this gene. action: ACCEPT reason: Insc is a canonical regulator of asymmetric cell division; loss of insc disrupts spindle orientation and basal determinant localization. Well supported phylogenetically and experimentally. supported_by: - reference_id: PMID:8779714 supporting_text: orientation of the mitotic spindle and correct localization of Numb and Prospero in these cells require the inscuteable gene - term: id: GO:0045176 label: apical protein localization evidence_type: IBA original_reference_id: GO_REF:0000033 qualifier: involved_in review: summary: Phylogenetic (IBA) annotation that Insc functions in apical protein localization, consistent with its role in nucleating the apical complex. action: ACCEPT reason: Insc directs apical localization of partner proteins and nucleates the apical complex; supported both phylogenetically and experimentally. supported_by: - reference_id: PMID:11707517 supporting_text: Inscuteable also directs asymmetric protein localization to the apical cell cortex during later stages of mitosis - term: id: GO:0008356 label: asymmetric cell division evidence_type: IEA original_reference_id: GO_REF:0000002 qualifier: involved_in review: summary: InterPro-to-GO (IEA) mapping from the Inscuteable InterPro signature to asymmetric cell division. action: ACCEPT reason: The IEA maps the Inscuteable family signature (IPR039921) to asymmetric cell division, which is the defining biological role of this protein family. The term is slightly broader than the experimental annotations (e.g. asymmetric neuroblast division) but is a correct and appropriate parent-level mapping. supported_by: - reference_id: PMID:12526793 supporting_text: A complex of apically localized molecules mediates basal localization of cell fate determinants and apicobasal orientation of the mitotic spindle - term: id: GO:1990499 label: raps-insc complex evidence_type: IDA original_reference_id: PMID:22171003 qualifier: part_of review: summary: Insc is a subunit of the raps(Pins)-insc complex, demonstrated directly by the crystal structure of the Drosophila Pins TPR domain bound to the Insc peptide. action: ACCEPT reason: Direct experimental (IDA) evidence, including a co-crystal structure, establishes Insc as part of the raps(Pins/LGN)-Insc complex (ComplexPortal CPX-3174). raps is the Drosophila LGN/Pins ortholog. This complex membership is a core structural feature underlying Insc adaptor function. supported_by: - reference_id: PMID:22171003 supporting_text: The crystal structure of the Drosophila ortholog of LGN (known as Pins) in complex with Insc reveals a modular interface contributed by evolutionary conserved residues - term: id: GO:0050829 label: defense response to Gram-negative bacterium evidence_type: IMP original_reference_id: PMID:19046341 qualifier: involved_in review: summary: An insc mutant showed increased susceptibility to intestinal Vibrio cholerae (a Gram-negative bacterium) in a genome-wide susceptibility screen, but the mechanism was explicitly uncharacterized. action: KEEP_AS_NON_CORE reason: This IMP derives from a large forward-genetic V. cholerae susceptibility screen in which insc was one of many hits that increased susceptibility. The authors state the role of these proteins in immunity was not characterized, and any effect is plausibly indirect (e.g. via asymmetric division/renewal of gut epithelial cells). It is a legitimate experimental annotation but clearly peripheral and mechanistically unresolved, not a core Insc function; kept but marked non-core. supported_by: - reference_id: PMID:19046341 supporting_text: Inscuteable and Cyp6a20, both of which increased susceptibility to V. cholerae infection - reference_id: PMID:19046341 supporting_text: The role of these proteins in immunity to infection has not been characterized - term: id: GO:0007400 label: neuroblast fate determination evidence_type: IDA original_reference_id: PMID:19782677 qualifier: involved_in review: summary: Insc is required for correct sibling-cell fate specification during neuroblast lineage progression, acting through asymmetric cell division that feeds into differential Notch signalling. action: KEEP_AS_NON_CORE reason: This annotation captures Insc's contribution to neuroblast-lineage fate decisions, which is a downstream consequence of its core asymmetric-division/spindle-orientation role rather than a direct determinant of neuroblast identity per se. The requirement is lineage- and stage-dependent. Kept as a valid but non-core developmental annotation. supported_by: - reference_id: PMID:19782677 supporting_text: Inscuteable plays a major role in controlling asymmetric cell division, which ultimately leads to differential activation of the Notch signalling pathway and correct specification of the two daughter cells - reference_id: PMID:19782677 supporting_text: three neuroblast lineages (NB1-1, NB4-2, and NB7-1) require insc function for sibling cell fate specification in cells born from early GMCs - term: id: GO:0061382 label: Malpighian tubule tip cell differentiation evidence_type: IMP original_reference_id: PMID:10625542 qualifier: involved_in review: summary: Insc is implicated in the asymmetric division of the Malpighian tubule tip mother cell, consistent with insc expression in the Malpighian tubule primordium. action: KEEP_AS_NON_CORE reason: The cited paper (an IMP by a FlyBase curator with access to the full text) dissects tip-cell fate via wingless/Notch/Numb; the cached abstract does not name insc, but insc is expressed in Malpighian tubules and the tip cell arises by an asymmetric (SOP-like) division that would use the Insc apical machinery. Not removed (experimental annotation, full text not available to verify); kept as a peripheral, tissue-specific developmental annotation. supported_by: - reference_id: PMID:8626022 supporting_text: whose expression is coincident with sites of cell shape changes or cell and tissue movement in the embryo, e.g., neuroblasts, trachea, Malphigian tubules - reference_id: PMID:10625542 supporting_text: Second, Notch signalling is restricted by the asymmetric segregation of Numb, as the tip mother cell divides - term: id: GO:0005515 label: protein binding evidence_type: IPI original_reference_id: PMID:11707517 qualifier: enables review: summary: Yeast two-hybrid/IPI evidence that Insc binds the coiled-coil microtubule-binding protein Cornetto (FBgn0259173). protein binding is uninformative and should be replaced by the specific partner-binding molecular function this interaction serves. action: MODIFY reason: Bare GO:0005515 protein binding conveys no functional information. The GOA WITH/FROM partner for this IPI is Cornetto (FBgn0259173), a coiled-coil cytoskeletal (microtubule-associated) protein, so the informative binding term is cytoskeletal protein binding (GO:0008092). This keeps the annotation faithful to the physical-interaction evidence; Insc's downstream cytoskeletal adaptor activity (GO:0008093) is separately captured by its IBA and IMP annotations. proposed_replacement_terms: - id: GO:0008092 label: cytoskeletal protein binding supported_by: - reference_id: PMID:11707517 supporting_text: In a two-hybrid screen for Inscuteable-binding proteins, we have identified the coiled-coil protein Cornetto - term: id: GO:0045176 label: apical protein localization evidence_type: IMP original_reference_id: PMID:11707517 qualifier: involved_in review: summary: Loss/perturbation of insc abolishes apical localization of the partner protein Cornetto, demonstrating an Insc requirement for apical protein localization. action: ACCEPT reason: Direct genetic (IMP) evidence that Insc is required for apical protein localization (Cornetto forms an apical crescent in an inscuteable-dependent manner). This is a core Insc biological process. supported_by: - reference_id: PMID:11707517 supporting_text: forms an apical crescent during telophase in an inscuteable-dependent manner - term: id: GO:0045176 label: apical protein localization evidence_type: IPI original_reference_id: PMID:11707517 qualifier: involved_in review: summary: Physical-interaction (IPI) support for Insc's role in apical protein localization, via its interaction with Cornetto. action: ACCEPT reason: Duplicate GO term with IPI evidence linking the Insc-Cornetto interaction to apical protein localization; consistent with and reinforcing the IMP annotation. Retained as a valid core-process annotation. supported_by: - reference_id: PMID:11707517 supporting_text: Inscuteable also directs asymmetric protein localization to the apical cell cortex during later stages of mitosis - term: id: GO:0009786 label: regulation of asymmetric cell division evidence_type: IMP original_reference_id: PMID:19088087 qualifier: involved_in review: summary: Regulation of asymmetric cell division is a well-established core Insc function, though the cached text of the cited reference focuses on the T-box gene mid rather than insc. action: ACCEPT reason: The term correctly captures a core Insc function. The GOA reference (PMID:19088087) is a study of mid/midline in the RP2/sib lineage; its cached abstract and text do not describe insc experiments, so its specific relevance to insc could not be verified here. Because the function itself is strongly supported by canonical primary studies, the term is accepted and supported by those references; the original citation is flagged as unverified in reference_review. supported_by: - reference_id: PMID:8779714 supporting_text: orientation of the mitotic spindle and correct localization of Numb and Prospero in these cells require the inscuteable gene - reference_id: PMID:12526793 supporting_text: A complex of apically localized molecules mediates basal localization of cell fate determinants and apicobasal orientation of the mitotic spindle - term: id: GO:0051960 label: regulation of nervous system development evidence_type: IMP original_reference_id: PMID:19088087 qualifier: involved_in review: summary: A broad developmental term; Insc regulates nervous-system development indirectly by controlling asymmetric divisions that generate neuronal diversity. action: KEEP_AS_NON_CORE reason: Regulation of nervous system development is a high-level, pleiotropic term that is a downstream consequence of Insc's core asymmetric-division role. As with the paired annotation, the cited reference (PMID:19088087) concerns mid and does not, in the cached text, document insc experiments. Kept as a valid but non-core developmental annotation; reference flagged as unverified. supported_by: - reference_id: PMID:19782677 supporting_text: Inscuteable plays a major role in controlling asymmetric cell division, which ultimately leads to differential activation of the Notch signalling pathway and correct specification of the two daughter cells - term: id: GO:0045179 label: apical cortex evidence_type: IDA original_reference_id: PMID:9888987 qualifier: located_in review: summary: Direct localization evidence placing Inscuteable at the apical cortex of interphase neuroblasts, among the asymmetrically localized apical proteins. action: ACCEPT reason: IDA localization to the apical cortex, a core and repeatedly confirmed aspect of Insc cell biology. supported_by: - reference_id: PMID:9888987 supporting_text: All of these factors are apically localized during interphase, and all except Inscuteable move to the basal cortex at mitosis - term: id: GO:0045179 label: apical cortex evidence_type: IDA original_reference_id: PMID:17726110 qualifier: located_in review: summary: Insc is recruited to the apical cortex by Pins/Galphai (a Mud-independent Pins function), placing Insc at the apical cortex. action: ACCEPT reason: IDA apical-cortex localization; this study shows Galphai-bound Pins recruits Insc to the apical cortex, reinforcing the core localization and the Insc-Pins relationship. supported_by: - reference_id: PMID:17726110 supporting_text: recruitment of Insc to the apical cortex - term: id: GO:0045179 label: apical cortex evidence_type: IDA original_reference_id: PMID:16377571 qualifier: located_in review: summary: Insc/Par apical-cortex localization; the Inscuteable/Par pathway coordinates neuroblast cortical polarity with tissue polarity from prophase. action: ACCEPT reason: IDA supporting apical-cortex localization of Insc as part of the Insc/Par pathway. Core localization. supported_by: - reference_id: PMID:16377571 supporting_text: The Inscuteable/Par pathway initiates at prophase to coordinate neuroblast cortical polarity with CNS tissue polarity - term: id: GO:0055059 label: asymmetric neuroblast division evidence_type: IGI original_reference_id: PMID:12526793 qualifier: involved_in review: summary: Genetic-interaction evidence that insc, as an apical-complex gene, controls mitotic spindle geometry and daughter-cell size during asymmetric neuroblast (and pI) divisions. action: ACCEPT reason: Asymmetric neuroblast division is the defining core biological process of Insc. IGI evidence with apical-complex partners (Bazooka/aPKC and Pins/Galphai pathways) supports this directly. supported_by: - reference_id: PMID:12526793 supporting_text: mitotic spindle geometry and unequal daughter cell size are controlled by two parallel pathways (Bazooka/DaPKC and Pins/G alpha i) within the apical complex - term: id: GO:0005737 label: cytoplasm evidence_type: IDA original_reference_id: PMID:9267024 qualifier: located_in review: summary: Insc detected in the cytoplasm; a broad, non-specific localization relative to its functional apical-cortex site. action: KEEP_AS_NON_CORE reason: Cytoplasm is a correct but uninformative localization. Insc's functionally relevant location is the apical cell cortex; a diffuse cytoplasmic pool (e.g. before cortical recruitment) does not represent a core functional site. Retained but marked non-core. supported_by: - reference_id: PMID:9267024 supporting_text: Inscuteable and Staufen interact and colocalize with prospero RNA on the apical cortex of interphase neuroblasts - term: id: GO:0005938 label: cell cortex evidence_type: IDA original_reference_id: PMID:10903176 qualifier: located_in review: summary: Cell-cortex localization of Insc in the NB6-4T lineage, where insc is required for the correct glia-neuron fate switch. Cell cortex is the parent of the more specific apical cortex. action: ACCEPT reason: Cell cortex is a correct (if broader) localization consistent with the canonical apical-cortex annotations. The study also documents insc requirement for the NB6-4T asymmetric division outcome, supporting Insc cortical function in this lineage. supported_by: - reference_id: PMID:10903176 supporting_text: miranda and inscuteable mutations altered the behavior of Pros, resulting in failure to correctly switch the glial and neuronal fates - term: id: GO:0006403 label: RNA localization evidence_type: IMP original_reference_id: PMID:9267024 qualifier: involved_in review: summary: Insc is required for apical localization of prospero mRNA, acting upstream by nucleating the apical complex that (via Staufen) localizes the RNA. action: KEEP_AS_NON_CORE reason: Insc's effect on RNA (prospero mRNA) localization is an indirect, downstream consequence of its scaffold/adaptor role - Insc nucleates the apical complex and Staufen mediates the actual RNA localization. A valid experimental annotation but not a core Insc molecular activity; the general RNA localization term could also be refined toward intracellular mRNA localization. Kept as non-core. supported_by: - reference_id: PMID:9267024 supporting_text: Inscuteable nucleates an apical complex and is required for protein localization, spindle orientation, and RNA localization - term: id: GO:0007422 label: peripheral nervous system development evidence_type: IMP original_reference_id: PMID:7615665 qualifier: involved_in review: summary: The insc allele nem shows peripheral nervous system defects (chordotonal organs), indicating a requirement in PNS development. action: KEEP_AS_NON_CORE reason: The nem mutation is an allele of insc (UniProt/FlyBase synonym). Its PNS (chordotonal organ) defects reflect Insc's requirement in the asymmetric divisions that build sensory lineages - a genuine but pleiotropic developmental role, kept non-core relative to the core ACD/spindle-orientation function. supported_by: - reference_id: PMID:7615665 supporting_text: it may be required for the development of the somatic musculature and the chordotonal organs of the PNS - term: id: GO:0007423 label: sensory organ development evidence_type: TAS original_reference_id: PMID:10973066 qualifier: involved_in review: summary: Insc functions in sensory-organ development through asymmetric divisions of sensory-organ precursors (pI cells). NOTE - the GOA reference for this TAS appears to be a mis-citation. action: KEEP_AS_NON_CORE reason: Sensory-organ development is a real Insc-associated process (Insc/apical-complex genes control pI/SOP asymmetric divisions). However, the cited reference PMID:10973066 is a review titled Genetics of heart development whose abstract concerns cardiac development and does not mention insc or sensory organs - it looks like a wrong/mis-applied citation. The term is retained (non-core) and supported by an appropriate primary reference; the original citation is flagged in reference_review. supported_by: - reference_id: PMID:12526793 supporting_text: In sensory organ precursors, Bazooka/DaPKC and Pins/G alpha i localize to opposite sides of the cortex - term: id: GO:0007525 label: somatic muscle development evidence_type: IMP original_reference_id: PMID:7615665 qualifier: involved_in review: summary: The insc allele nem shows reduced/disrupted somatic musculature, indicating a requirement (likely indirect) in somatic muscle development. action: KEEP_AS_NON_CORE reason: nem is an allele of insc; nem mutants show partial absence of somatic muscles and unfused myoblasts. This is a genuine experimental phenotype but is peripheral and probably an indirect consequence of defective asymmetric divisions/precursor specification, not a core Insc molecular role. Kept non-core. supported_by: - reference_id: PMID:7615665 supporting_text: it may be required for the development of the somatic musculature and the chordotonal organs of the PNS - term: id: GO:0008093 label: cytoskeletal adaptor activity evidence_type: IMP original_reference_id: PMID:8626022 qualifier: enables review: summary: Original genetic/molecular characterization of insc as encoding a candidate cytoskeleton adaptor protein localized to the apical submembranous cortex. action: ACCEPT reason: This is the founding experimental support for the core molecular function. The protein was identified as a candidate cytoskeleton adaptor, apically localized, with a mutant phenotype consistent with a role in cytoskeleton organization - later refined to the Par3-Pins bridging adaptor activity. supported_by: - reference_id: PMID:8626022 supporting_text: The Inscuteable protein is localized to the apical submembranous surface of neuroblasts and other cell types and shows certain features common to a family of putative cytoskeletal associated proteins - term: id: GO:0008104 label: intracellular protein localization evidence_type: IMP original_reference_id: PMID:8779714 qualifier: involved_in review: summary: Insc is required for correct intracellular localization of cell-fate determinants (Numb and Prospero) to the basal cortex during asymmetric division. action: KEEP_AS_NON_CORE reason: This broad term captures Insc's requirement for basal segregation of determinants (Numb, Prospero), complementary to the apical-protein-localization annotations. It is correct but general; retained as a non-core annotation because the more specific apical-localization and asymmetric-division terms better represent the core function. supported_by: - reference_id: PMID:8779714 supporting_text: orientation of the mitotic spindle and correct localization of Numb and Prospero in these cells require the inscuteable gene - term: id: GO:0040001 label: establishment of mitotic spindle localization evidence_type: IMP original_reference_id: PMID:10620800 qualifier: involved_in review: summary: Insc is required for correct positioning/orientation of the mitotic spindle; the more precise term for the Insc phenotype is establishment of mitotic spindle orientation. action: MODIFY reason: The canonical, repeatedly demonstrated Insc phenotype is misorientation of the mitotic spindle relative to the apical-basal polarity axis (spindle rotation fails / spindle not aligned), which is precisely captured by GO:0000132 establishment of mitotic spindle orientation rather than the more generic GO:0040001 establishment of mitotic spindle localization. This study documents neuroblast spindle rotation that is disrupted when the apical machinery is impaired. proposed_replacement_terms: - id: GO:0000132 label: establishment of mitotic spindle orientation supported_by: - reference_id: PMID:10620800 supporting_text: neuroblast spindles are initially formed in the same axis as epidermal cells, but rotate before cell division - term: id: GO:0040001 label: establishment of mitotic spindle localization evidence_type: IMP original_reference_id: PMID:8779714 qualifier: involved_in review: summary: Insc is genetically required to orient the mitotic spindle; ectopic Insc reorients spindles. Best captured by establishment of mitotic spindle orientation. action: MODIFY reason: Direct genetic evidence that spindle orientation requires insc and that ectopic insc reorients spindles - this is spindle orientation, more accurately GO:0000132 establishment of mitotic spindle orientation than the generic GO:0040001 spindle localization term. proposed_replacement_terms: - id: GO:0000132 label: establishment of mitotic spindle orientation supported_by: - reference_id: PMID:8779714 supporting_text: ectopic expression of inscuteable in other epithelial cells leads to spindle reorientation - term: id: GO:0045179 label: apical cortex evidence_type: IDA original_reference_id: PMID:8779714 qualifier: located_in review: summary: Insc localizes to the apical cell cortex before mitosis, establishing polarity for asymmetric division. action: ACCEPT reason: IDA apical-cortex localization from the foundational functional study; core localization. supported_by: - reference_id: PMID:8779714 supporting_text: The Inscuteable protein localizes to the apical cell cortex before mitosis, suggesting that Inscuteable functions in establishing polarity for asymmetric cell division - term: id: GO:0045179 label: apical cortex evidence_type: IDA original_reference_id: PMID:9267024 qualifier: located_in review: summary: Insc localizes to (and nucleates an apical complex at) the apical cortex of interphase neuroblasts, colocalizing with Staufen and prospero RNA. action: ACCEPT reason: IDA apical-cortex localization; Insc colocalizes with Staufen/prospero RNA apically and nucleates the apical complex there. Core localization. supported_by: - reference_id: PMID:9267024 supporting_text: Inscuteable and Staufen interact and colocalize with prospero RNA on the apical cortex of interphase neuroblasts references: - id: GO_REF:0000002 title: Gene Ontology annotation through association of InterPro records with GO terms findings: [] - id: GO_REF:0000033 title: Annotation inferences using phylogenetic trees findings: [] - id: PMID:10620800 title: Rotation and asymmetry of the mitotic spindle direct asymmetric cell division in the developing central nervous system. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Live-imaging study of neuroblast spindle rotation and anaphase spindle asymmetry directing ACD; supports the spindle-orientation role. PubMed-verified title/abstract match. - id: PMID:10625542 title: Multiple signalling pathways establish cell fate and cell number in Drosophila malpighian tubules. findings: [] reference_review: relevance: LOW correctness: UNVERIFIED review_notes: Malpighian tubule tip-cell study (wingless/Notch/Numb). Cached abstract does not name insc; the IMP presumably rests on full-text data not available here. Relevance to insc plausible (asymmetric tip-cell division; insc expressed in Malpighian tubules) but unverified. - id: PMID:10903176 title: Mechanism of glia-neuron cell-fate switch in the Drosophila thoracic neuroblast 6-4 lineage. findings: [] reference_review: relevance: MEDIUM correctness: VERIFIED review_notes: Shows insc (and miranda) mutations disrupt Prospero behavior and the glia-neuron fate switch in NB6-4T; supports cortical/ACD role. Abstract explicitly names inscuteable. - id: PMID:10973066 title: Genetics of heart development. findings: [] reference_review: relevance: NONE correctness: WRONG_IDENTIFIER review_notes: Cited (TAS) for insc sensory organ development, but this is a review of cardiac/heart development in zebrafish and Drosophila; the abstract does not mention inscuteable or sensory organs. Appears to be a wrong/mis-applied citation for this annotation; the sensory-organ-development role itself is real but should be sourced to a primary pI/SOP study (e.g. PMID:12526793). - id: PMID:11707517 title: Inscuteable-dependent apical localization of the microtubule-binding protein Cornetto suggests a role in asymmetric cell division. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Directly on insc; documents apical-cortex localization (interphase-metaphase), the Insc-Cornetto interaction (2-hybrid), and inscuteable-dependent apical protein localization. PubMed-verified. - id: PMID:12526793 title: Apical complex genes control mitotic spindle geometry and relative size of daughter cells in Drosophila neuroblast and pI asymmetric divisions. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Apical-complex (incl. insc pathway) control of spindle geometry and daughter-cell size in NB and pI (sensory organ precursor) divisions; supports ACD and sensory-organ roles. PubMed-verified. - id: PMID:16377571 title: Microtubule-induced Pins/Galphai cortical polarity in Drosophila neuroblasts. findings: [] reference_review: relevance: MEDIUM correctness: VERIFIED review_notes: Defines the Inscuteable/Par pathway acting from prophase in parallel to a microtubule/Khc-73/Dlg pathway; supports apical Insc/Par localization and function. PubMed-verified. - id: PMID:17726110 title: Galphai generates multiple Pins activation states to link cortical polarity and spindle orientation in Drosophila neuroblasts. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Full text states Galphai-bound Pins (GoLoco1) recruits Insc to the apical cortex; supports apical localization and the Insc-Pins(raps) relationship. PubMed/PMC-verified. - id: PMID:19046341 title: Genetic analysis of Drosophila melanogaster susceptibility to intestinal Vibrio cholerae infection. findings: [] reference_review: relevance: LOW correctness: VERIFIED review_notes: Genome-wide V. cholerae susceptibility screen; insc mutant increased susceptibility, but the authors explicitly state the immune role was not characterized. Correctly cited for a weak, peripheral IMP. Full text (PMC) confirms the insc hit. - id: PMID:19088087 title: Ancestry-independent fate specification and plasticity in the developmental timing of a typical Drosophila neuronal lineage. findings: [] reference_review: relevance: LOW correctness: UNVERIFIED review_notes: GOA reference for insc regulation of asymmetric cell division and regulation of nervous system development, but the cached abstract and full text concern the T-box gene mid in the RP2/sib lineage and do not describe insc experiments. Its specific support for these insc annotations could not be verified; the annotated functions are independently well established. - id: PMID:19782677 title: On the roles of Notch, Delta, kuzbanian, and inscuteable during the development of Drosophila embryonic neuroblast lineages. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Directly on insc; shows lineage/stage-dependent requirement of insc for sibling cell fate specification via ACD feeding differential Notch. PubMed-verified. - id: PMID:22171003 title: Inscuteable and NuMA proteins bind competitively to Leu-Gly-Asn repeat-enriched protein (LGN) during asymmetric cell divisions. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Crystal structure of Drosophila Pins(LGN) TPR bound to Insc peptide; defines the adaptor bridge (Par3 to Pins/Galphai) and raps-insc complex. Core molecular-function and complex-membership evidence. PMC full text verified. - id: PMID:7615665 title: The mutant not enough muscles (nem) reveals reduction of the Drosophila embryonic muscle pattern. findings: [] reference_review: relevance: MEDIUM correctness: VERIFIED review_notes: nem is an allele of insc (UniProt/FlyBase synonym). Documents somatic-muscle and PNS (chordotonal) defects - peripheral, pleiotropic insc phenotypes. PubMed-verified. - id: PMID:8626022 title: inscuteable, a neural precursor gene of Drosophila, encodes a candidate for a cytoskeleton adaptor protein. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Founding characterization of insc; apical submembranous localization, candidate cytoskeleton adaptor, expression in neuroblasts/trachea/Malpighian tubules. PubMed-verified. - id: PMID:8779714 title: Role of inscuteable in orienting asymmetric cell divisions in Drosophila. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Foundational functional study; insc required for spindle orientation and Numb/Prospero localization; apical-cortex localization; ectopic insc reorients spindles. PubMed-verified. - id: PMID:9267024 title: Inscuteable and Staufen mediate asymmetric localization and segregation of prospero RNA during Drosophila neuroblast cell divisions. findings: [] reference_review: relevance: HIGH correctness: VERIFIED review_notes: Insc nucleates the apical complex; required for protein localization, spindle orientation, and (with Staufen) prospero RNA localization; apical colocalization. PubMed-verified. - id: PMID:9888987 title: Identification of Miranda protein domains regulating asymmetric cortical localization, cargo binding, and cortical release. findings: [] reference_review: relevance: MEDIUM correctness: VERIFIED review_notes: Miranda-focused study that documents Inscuteable among the apically localized proteins in interphase neuroblasts (apical cortex localization); notes Insc uniquely stays apical while other factors move basally. PubMed-verified. core_functions: - description: >- Cytoskeletal adaptor/scaffold activity - Inscuteable bridges the apical Par polarity complex (Bazooka/Par3) to the Partner-of-Inscuteable (Pins/raps, the Drosophila LGN ortholog)-Galphai spindle-tethering machinery, nucleating an apical protein complex at the apical cell cortex. This bridging couples apical-basal cell polarity to mitotic spindle orientation and is the molecular basis of Insc function in asymmetric division. supported_by: - reference_id: PMID:22171003 supporting_text: the adaptor Inscuteable (Insc) bridges between Par3 and the spindle tethering machinery assembled on - reference_id: PMID:8626022 supporting_text: shows certain features common to a family of putative cytoskeletal associated proteins molecular_function: id: GO:0008093 label: cytoskeletal adaptor activity directly_involved_in: - id: GO:0055059 label: asymmetric neuroblast division - id: GO:0000132 label: establishment of mitotic spindle orientation - id: GO:0045176 label: apical protein localization locations: - id: GO:0045179 label: apical cortex in_complex: id: GO:1990499 label: raps-insc complex proposed_new_terms: [] suggested_questions: - question: What is the direct mechanistic basis for the insc mutant susceptibility to intestinal Vibrio cholerae infection (PMID:19046341) - is it an indirect consequence of altered asymmetric division/renewal in the gut epithelium, or a distinct role? - question: Are the somatic-muscle and Malpighian-tubule phenotypes of insc(nem) direct requirements for Insc in those precursor divisions, or secondary to CNS/PNS defects? suggested_experiments: - hypothesis: The Insc-Par3 and Insc-Pins interactions are separable arms of a single adaptor bridge, each required for a distinct step of asymmetric division. description: Generate structure-guided separation-of-function alleles disrupting the Insc-Par3 versus Insc-Pins interfaces and assay each for apical complex assembly, spindle orientation, and basal determinant segregation in neuroblasts. experiment_type: structure-function mutagenesis and in vivo imaging - hypothesis: The infection-susceptibility phenotype reflects an insc requirement in asymmetric division/renewal of the adult gut epithelium rather than a direct immune function. description: Perform tissue-specific insc knockdown in adult intestinal stem cells during V. cholerae challenge and score epithelial integrity, cell death, and survival. experiment_type: conditional RNAi and infection assay