Ced-12

Existing Annotations Review

GO Term	Evidence	Action	Reason
GO:0005886 plasma membrane	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation based on phylogenetic inference. ELMO proteins localize to the plasma membrane at sites of active Rac signaling, including phagocytic cups, leading edges during migration, and fusion foci during myoblast fusion. Reason: ELMO/CED-12 proteins function at the plasma membrane where they partner with DOCK-family GEFs to activate Rac signaling. The deep research confirms that DOCK-ELMO complexes localize to membrane-proximal sites including phagocytic cups and leading edges (Venkatachalam et al. 2024, PLOS Genetics). Plasma membrane localization is consistent with the PH domain-mediated membrane targeting of ELMO proteins (PMID:18163987, PMID:21283588). IBA is appropriate and well-supported. Supporting Evidence: PMID:18163987 we describe the isolation of Drosophila ELMO/CED-12, an approximately 82 kDa protein with a pleckstrin homology (PH) and proline-rich domain, by interaction with the MBC SH3 domain file:DROME/Ced-12/Ced-12-deep-research-falcon.md Ced-12-Mbc is predicted to localize to phagocytic cups and corpse contacts to drive Rac-dependent branched actin
GO:0007015 actin filament organization	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for actin filament organization. The DOCK-ELMO complex activates Rac, which in turn stimulates WAVE/SCAR-Arp2/3 mediated branched actin polymerization. Reason: This is a core function of Ced-12/ELMO proteins. The DOCK-ELMO-Rac signaling axis drives actin cytoskeletal reorganization through the WAVE/SCAR-Arp2/3 pathway. Experimental evidence from C. elegans (PMID:11703939) and structural/genetic studies in 2024 (Venkatachalam et al., PLOS Genetics; Kukimoto-Niino et al., JBC) confirm this conserved function. IBA appropriately captures this phylogenetically conserved role. Supporting Evidence: PMID:11703939 Expression of CED-12 and its counterparts in murine Swiss 3T3 fibroblasts induced Rho GTPase-dependent formation of actin filament bundles file:DROME/Ced-12/Ced-12-deep-research-falcon.md Activated Rac stimulates the WAVE/SCAR complex, which activates Arp2/3 to build branched actin networks at membrane-proximal sites
GO:0048870 cell motility	IBA GO_REF:0000033	ACCEPT	Summary: IBA annotation for cell motility. ELMO/CED-12 proteins are essential regulators of cell migration through their role in Rac activation at leading edges. Reason: Cell motility is a well-established function of ELMO/CED-12 proteins across species. In Drosophila, experimental evidence directly supports roles in border cell migration (PMID:17637670, PMID:18163987) and other migratory processes. The IBA annotation correctly captures this phylogenetically conserved function. Supporting Evidence: PMID:17637670 The myoblast city (Mbc, also known as DOCK180) and engulfment and cell motility (ELMO, also known as Ced-12) pathway is required for the early phase, in which guidance depends on subcellular localization of signalling within a leading cell PMID:11703939 The C. elegans gene ced-12 functions in the engulfment of apoptotic cells and in cell migration
GO:0006909 phagocytosis	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation from UniProtKB keyword mapping (Phagocytosis keyword). ELMO/CED-12 proteins are well-established regulators of phagocytosis, particularly engulfment of apoptotic cells (efferocytosis). Reason: While direct experimental evidence for Ced-12 in Drosophila phagocytosis is limited in the literature reviewed, this annotation captures a biologically valid and evolutionarily conserved function. CED-12 was originally identified in C. elegans for its role in apoptotic cell engulfment (PMID:11703939). The deep research confirms that DOCK-ELMO complexes act as Rac GEFs that activate the WAVE/SCAR-Arp2/3 pathway to generate branched F-actin at membrane-proximal sites for engulfment (Venkatachalam et al. 2024). The SPKW annotation captures legitimate biology that experimental work in Drosophila has not yet specifically addressed - the focus has been on migration and fusion, but phagocytic function is expected based on conservation. Supporting Evidence: PMID:11703939 The C. elegans gene ced-12 functions in the engulfment of apoptotic cells and in cell migration, acting in a signaling pathway with ced-2 Crkll, ced-5 DOCK180, and ced-10 Rac GTPase file:DROME/Ced-12/Ced-12-deep-research-falcon.md Efferocytosis/apoptotic corpse clearance: Ced-12-Mbc is predicted to localize to phagocytic cups and corpse contacts to drive Rac-dependent branched actin required for engulfment UniProt:Q9VKB2 Involved in cytoskeletal rearrangements required for phagocytosis of apoptotic cells and cell motility
GO:0006915 apoptotic process	IEA GO_REF:0000043	MODIFY	Summary: IEA annotation from UniProtKB keyword mapping (Apoptosis keyword). This annotation requires careful interpretation - Ced-12/ELMO functions in the engulfing cell during apoptotic cell clearance, not in the apoptotic cell itself. Reason: The annotation to "apoptotic process" is imprecise. Ced-12/ELMO does not regulate the apoptotic process itself; rather, it functions in engulfing cells to clear apoptotic corpses (efferocytosis). The deep research clearly states that ELMO functions in "Efferocytosis/apoptotic corpse clearance" where "Ced-12-Mbc is predicted to localize to phagocytic cups and corpse contacts". The UniProt function description also clarifies this: "cytoskeletal rearrangements required for phagocytosis of apoptotic cells". A more specific term like "engulfment of apoptotic cell" (GO:0043652) would be more accurate. Proposed replacements: engulfment of apoptotic cell Supporting Evidence: PMID:11703939 CED-12 acts in engulfing cells for cell corpse engulfment file:DROME/Ced-12/Ced-12-deep-research-falcon.md Efferocytosis / apoptotic corpse clearance: Ced-12-Mbc is predicted to localize to phagocytic cups and corpse contacts
GO:0017124 SH3 domain binding	IEA GO_REF:0000043	ACCEPT	Summary: IEA annotation from UniProtKB keyword mapping (SH3-binding keyword). Ced-12/ELMO contains a proline-rich motif that binds to the SH3 domain of DOCK family proteins. Reason: This is a well-established molecular function of ELMO proteins. The C-terminal proline-rich region of ELMO binds to the N-terminal SH3 domain of DOCK/CDM family proteins (Mbc in Drosophila). This interaction is essential for formation of the functional DOCK-ELMO GEF complex. Multiple publications confirm this interaction (PMID:11703939, PMID:18163987, PMID:21283588). Supporting Evidence: PMID:11703939 ced-12 encodes a protein with a pleckstrin homology (PH) domain and an SH3 binding motif, both of which are important for ced-12 function PMID:18163987 we describe the isolation of Drosophila ELMO/CED-12, an approximately 82 kDa protein with a pleckstrin homology (PH) and proline-rich domain, by interaction with the MBC SH3 domain PMID:21283588 The N-terminal SH3 domain of CDM family members associates with the C-terminal region of the ELMO family of proteins
GO:0005515 protein binding	IPI PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	MODIFY	Summary: IPI annotation for protein binding based on physical interaction with Mbc detected by immunoprecipitation and mass spectrometry in PMID:18163987. Reason: While the annotation is technically correct (ELMO does bind proteins), "protein binding" is too generic and uninformative. The actual molecular function is more specific - Ced-12/ELMO binds to DOCK-family GEFs via its proline-rich domain interacting with the SH3 domain of Mbc, enhancing the GEF activity. A more informative term would be "guanyl-nucleotide exchange factor adaptor activity" (GO:0005091), which accurately describes ELMO's role as an adaptor that brings together GEF and substrate proteins. The existing annotation to GO:0017124 (SH3 domain binding) already captures part of this interaction. Proposed replacements: guanyl-nucleotide exchange factor adaptor activity Supporting Evidence: PMID:18163987 Mass spectrometry confirms the presence of an MBC/ELMO complex within the embryonic musculature at the time of myoblast fusion
GO:0160175 somatic muscle attachment to chitin-based cuticle	IMP PMID:24046451 Drosophila importin-7 functions upstream of the Elmo signali...	ACCEPT	Summary: IMP annotation based on mutant phenotype analysis showing elmo mutants have muscle attachment defects similar to integrin mutants. Reason: This is a well-supported experimental annotation. PMID:24046451 demonstrates that Elmo localizes to muscle attachment sites and that elmo mutants exhibit muscle attachment defects. The study shows genetic and biochemical interactions between Dim7 and Elmo in muscle attachment formation, with the muscle detachment phenotype being rescuable by the Elmo signaling pathway. Supporting Evidence: PMID:24046451 Phenotypic analysis of elmo mutants reveal muscle attachment defects similar to those previously described for integrin mutants PMID:24046451 Both Dim7 and Elmo localize to the ends of myofibers coincident with the timing of muscle-tendon attachment in late myogenesis
GO:0005085 guanyl-nucleotide exchange factor activity	IGI PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	MODIFY	Summary: IGI annotation based on genetic interaction showing that MBC and ELMO cooperate to activate Rac GTPases in Drosophila. Reason: This annotation is partially problematic. Ced-12/ELMO itself does not possess GEF catalytic activity - it lacks the DHR2 domain required for nucleotide exchange. Rather, ELMO enhances the GEF activity of its DOCK partner (Mbc). The more accurate term would be "guanyl-nucleotide exchange factor adaptor activity" (GO:0005091) or "guanyl nucleotide exchange factor activator activity" (GO:0160124). However, the DOCK-ELMO complex as a whole does function as a GEF, so the annotation is not entirely incorrect. The evidence in PMID:18163987 shows that MBC and ELMO cooperate to activate Rac but the GEF activity is provided by MBC, with ELMO enhancing it. Proposed replacements: guanyl-nucleotide exchange factor adaptor activity Supporting Evidence: PMID:18163987 Overexpression of MBC and ELMO/CED-12 in the eye causes perturbations in ommatidial organization that are suppressed by mutations in Rac1 and Rac2, demonstrating genetically that MBC and ELMO/CED-12 cooperate to activate these small GTPases in Drosophila file:DROME/Ced-12/Ced-12-deep-research-falcon.md A DOCK-Rac protein complex is sufficient for Rac activation, but may be enhanced by DOCK180 bound to ELMO
GO:0007298 border follicle cell migration	IMP PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	ACCEPT	Summary: IMP annotation based on mutant phenotype showing elmo mutants have border cell migration defects. Reason: Border follicle cell migration is a well-established function of the Mbc-ELMO pathway in Drosophila. Multiple publications support this annotation (PMID:18163987, PMID:17637670). The Mbc-ELMO complex functions downstream of PVR and EGFR signaling to drive directed border cell migration during oogenesis. Supporting Evidence: PMID:21283588 Mutations in mbc and elmo result in border cell migration defects in the ovary and myoblast fusion defects in the embryo PMID:17637670 The myoblast city (Mbc, also known as DOCK180) and engulfment and cell motility (ELMO, also known as Ced-12) pathway is required for the early phase
GO:0007520 myoblast fusion	IMP PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	ACCEPT	Summary: IMP annotation based on mutant phenotype showing elmo mutants have myoblast fusion defects. Reason: Myoblast fusion is one of the best-characterized functions of Ced-12/ELMO in Drosophila. PMID:18163987 provides direct evidence that embryos mutant for elmo exhibit defects in myoblast fusion. Mass spectrometry confirms the presence of an MBC/ELMO complex in the embryonic musculature at the time of myoblast fusion. This is a core function of Ced-12 in Drosophila development. Supporting Evidence: PMID:18163987 embryos maternally and/or zygotically mutant for elmo exhibit defects in myoblast fusion PMID:18163987 Mass spectrometry confirms the presence of an MBC/ELMO complex within the embryonic musculature at the time of myoblast fusion
GO:0046330 positive regulation of JNK cascade	IDA PMID:15457211 PVR plays a critical role via JNK activation in thorax closu...	ACCEPT	Summary: IDA annotation based on direct assay showing ELMO mediates JNK activation downstream of PVR signaling. Reason: PMID:15457211 demonstrates that ELMO functions as a mediator of JNK activation by PVR during thorax closure. The study provides biochemical and genetic evidence that Crk, Mbc, ELMO, and Rac are mediators of JNK activation by PVR. This is a specific signaling function of the Mbc-ELMO pathway in the context of thorax closure during metamorphosis. Supporting Evidence: PMID:15457211 We present evidence showing Crk (an adaptor molecule), Mbc, ELMO (a homolog of Caenorhabditis elegans CED-12 and mammalian ELMO), and Rac to be mediators of JNK activation by PVR
GO:0046529 imaginal disc fusion, thorax closure	IMP PMID:15457211 PVR plays a critical role via JNK activation in thorax closu...	ACCEPT	Summary: IMP annotation based on mutant phenotype showing defects in thorax closure. Reason: PMID:15457211 demonstrates that PVR is required for thorax closure during metamorphosis, with ELMO functioning as part of the signaling pathway. The study shows that decreased Mbc and ELMO function result in thorax closure defects. This is a specific developmental process in Drosophila that requires the Mbc-ELMO pathway. Supporting Evidence: PMID:15457211 Here we demonstrate that PVR is also required for the morphogenetic process, thorax closure, during metamorphosis PMID:21283588 Decreased Mbc and ELMO function exhibit abnormal ommatididal organization in the eye and thorax closure defects in the adult
GO:0048010 vascular endothelial growth factor receptor signaling pathway	IMP PMID:15457211 PVR plays a critical role via JNK activation in thorax closu...	KEEP AS NON CORE	Summary: IMP annotation placing ELMO in VEGF receptor signaling based on its role downstream of PVR (PDGF/VEGF receptor homolog) in Drosophila. Reason: While technically accurate in that PVR is the Drosophila homolog of PDGF/VEGF receptors and ELMO functions downstream of PVR signaling, this annotation represents a signaling context rather than a core molecular function of ELMO. The primary function of ELMO is as a GEF adaptor for Rac activation; its involvement in VEGFR/PVR signaling is context-dependent. This is a non-core annotation that places ELMO in a specific signaling pathway context. Supporting Evidence: PMID:15457211 PVR, the Drosophila homolog of the PDGF/VEGF receptor, has been implicated in border cell migration during oogenesis
GO:0007520 myoblast fusion	IMP PMID:25684354 Mechanical tension drives cell membrane fusion.	ACCEPT	Summary: Second IMP annotation for myoblast fusion from a different publication focusing on mechanical aspects of membrane fusion. Reason: This annotation provides additional independent evidence for ELMO's role in myoblast fusion. PMID:25684354 focuses on the mechanosensory response during cell-cell fusion. Duplicate annotations from different references strengthen the evidence for this function. Supporting Evidence: PMID:25684354 Previously, we have shown that cell-cell fusion is an asymmetric process in which an "attacking" cell drills finger-like protrusions into the "receiving" cell to promote cell fusion
GO:0005634 nucleus	IDA PMID:24046451 Drosophila importin-7 functions upstream of the Elmo signali...	ACCEPT	Summary: IDA annotation for nuclear localization based on immunohistochemical analysis. Reason: PMID:24046451 describes immunofluorescent detection of Ced-12/ELMO subcellular localization. While the primary function of ELMO is at the plasma membrane and cytoplasm, nuclear localization has been observed. This may relate to interactions with importin-7 (Dim7) described in the study. The annotation is based on direct experimental observation. Supporting Evidence: PMID:24046451 Dim7 is encoded by the moleskin (msk) locus and was identified as an Elmo-interacting protein
GO:0005737 cytoplasm	IDA PMID:24046451 Drosophila importin-7 functions upstream of the Elmo signali...	ACCEPT	Summary: IDA annotation for cytoplasmic localization based on immunohistochemical analysis. Reason: Cytoplasmic localization is expected for ELMO proteins, which function as cytoplasmic adaptor proteins that can be recruited to the plasma membrane upon activation. PMID:24046451 provides direct experimental evidence for cytoplasmic localization through immunofluorescence studies. Supporting Evidence: PMID:24046451 Both Dim7 and Elmo localize to the ends of myofibers coincident with the timing of muscle-tendon attachment in late myogenesis
GO:0007417 central nervous system development	IMP PMID:21283588 The DOCK protein sponge binds to ELMO and functions in Droso...	ACCEPT	Summary: IMP annotation based on mutant phenotype showing CNS axonal defects in elmo mutants. Reason: PMID:21283588 demonstrates that elmo functions in CNS development. Analysis of elmo mutants reveals axonal patterning defects including discontinuous lateral axon tracts, aberrant midline crossing, and misrouted axons. The study shows that ELMO interacts with the DOCK protein Sponge in the developing nervous system. Supporting Evidence: PMID:21283588 embryos maternally and zygotically mutant for elmoPB[c06760], a dramatic increase in axonal patterning defects were observed. In addition to an increased number of outer fascicle gaps, we saw aberrant midline crossing of longitudinal axons, and misrouting of outer longitudinal axons PMID:21283588 This suggests that elmo functions in CNS development in addition to its role in myoblast fusion and border cell migration
GO:0007298 border follicle cell migration	IMP PMID:17637670 Two distinct modes of guidance signalling during collective ...	ACCEPT	Summary: Second IMP annotation for border follicle cell migration from Nature publication. Reason: This high-impact publication provides strong independent evidence for ELMO's role in border cell migration. The study demonstrates that the Mbc-ELMO pathway is required specifically for the early phase of border cell migration, where guidance depends on subcellular localization of signaling within a leading cell. Supporting Evidence: PMID:17637670 The myoblast city (Mbc, also known as DOCK180) and engulfment and cell motility (ELMO, also known as Ced-12) pathway is required for the early phase, in which guidance depends on subcellular localization of signalling within a leading cell
GO:0007015 actin filament organization	IMP PMID:11703939 The C. elegans PH domain protein CED-12 regulates cytoskelet...	ACCEPT	Summary: IMP annotation based on direct experimental evidence showing CED-12 induces Rho GTPase-dependent actin filament bundle formation. Reason: This is a foundational publication for CED-12/ELMO function. While the experiments were primarily in C. elegans and mammalian cells, the study also identified the Drosophila counterpart and showed conserved function. Expression of CED-12 and its Drosophila counterpart in Swiss 3T3 fibroblasts induced Rho GTPase-dependent actin filament bundle formation, directly demonstrating the role in actin organization. Supporting Evidence: PMID:11703939 CED-12 has Drosophila and human counterparts. Expression of CED-12 and its counterparts in murine Swiss 3T3 fibroblasts induced Rho GTPase-dependent formation of actin filament bundles
GO:0016477 cell migration	IGI PMID:11703939 The C. elegans PH domain protein CED-12 regulates cytoskelet...	ACCEPT	Summary: IGI annotation based on genetic interaction showing ced-12 functions in cell migration pathway with ced-2, ced-5, and ced-10. Reason: Cell migration is a core function of CED-12/ELMO proteins across metazoa. PMID:11703939 demonstrates that ced-12 functions in cell migration, acting in a signaling pathway with ced-2/Crk, ced-5/DOCK180, and ced-10/Rac. While the primary experiments were in C. elegans, the conserved nature of this pathway and identification of Drosophila counterpart supports this annotation. Multiple other Drosophila publications confirm this function. Supporting Evidence: PMID:11703939 The C. elegans gene ced-12 functions in the engulfment of apoptotic cells and in cell migration, acting in a signaling pathway with ced-2 Crkll, ced-5 DOCK180, and ced-10 Rac GTPase
GO:0043652 engulfment of apoptotic cell	IBA GO_REF:0000033	NEW	Summary: Proposed new annotation based on the conserved role of ELMO/CED-12 proteins in apoptotic corpse engulfment (efferocytosis). Reason: While GO:0006909 (phagocytosis) and GO:0006915 (apoptotic process) are already annotated, a more specific term "engulfment of apoptotic cell" (GO:0043652) better captures the precise biological role of ELMO. CED-12 was originally named for its role in cell death abnormal phenotype in C. elegans, specifically defects in engulfment of apoptotic corpses. The deep research confirms this is a conserved function. While direct experimental evidence in Drosophila is limited, this function is expected based on strong phylogenetic conservation and could be annotated via IBA. Supporting Evidence: PMID:11703939 CED-12 acts in engulfing cells for cell corpse engulfment file:DROME/Ced-12/Ced-12-deep-research-falcon.md Efferocytosis / apoptotic corpse clearance: Ced-12-Mbc is predicted to localize to phagocytic cups and corpse contacts to drive Rac-dependent branched actin required for engulfment
GO:0005091 guanyl-nucleotide exchange factor adaptor activity	IDA PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	NEW	Summary: Proposed new annotation to capture ELMO's precise molecular function as a GEF adaptor. Reason: This term precisely describes ELMO's molecular function - it binds to DOCK-family GEFs (Mbc in Drosophila) and enhances their guanyl-nucleotide exchange activity toward Rac. ELMO does not possess GEF catalytic activity itself but acts as an adaptor that brings together the GEF (Mbc) and its substrate (Rac), enhancing the exchange reaction. PMID:18163987 demonstrates the physical interaction between ELMO and Mbc and shows that they cooperate to activate Rac. This is more specific than GO:0005085 (GEF activity) and accurately reflects ELMO's adapter role in the DOCK-ELMO-Rac signaling module. Supporting Evidence: PMID:18163987 Mass spectrometry confirms the presence of an MBC/ELMO complex within the embryonic musculature PMID:21283588 A DOCK-Rac protein complex is sufficient for Rac activation [12], [16], but may be enhanced by DOCK180 bound to ELMO file:DROME/Ced-12/Ced-12-deep-research-falcon.md Ced-12 is an ELMO-family adaptor that binds DOCK family GEFs (in flies, Mbc) to form a Rac-specific GEF module
GO:0035022 positive regulation of Rac protein signal transduction	IGI PMID:18163987 Drosophila ELMO/CED-12 interacts with Myoblast city to direc...	NEW	Summary: Proposed new annotation to capture ELMO's role in positively regulating Rac signaling. Reason: ELMO enhances Rac activation through the DOCK-ELMO complex. PMID:18163987 demonstrates genetically that MBC and ELMO cooperate to activate Rac GTPases in Drosophila and that the overexpression phenotype is suppressed by mutations in Rac1 and Rac2. This directly supports positive regulation of Rac signaling. This term is more specific than general GTPase regulation and accurately captures the downstream effect of ELMO function. Supporting Evidence: PMID:18163987 Overexpression of MBC and ELMO/CED-12 in the eye causes perturbations in ommatidial organization that are suppressed by mutations in Rac1 and Rac2, demonstrating genetically that MBC and ELMO/CED-12 cooperate to activate these small GTPases in Drosophila

Gene Description

Existing Annotations Review

Core Functions

Guanyl-nucleotide exchange factor adaptor: Ced-12/ELMO binds to DOCK-family GEFs (primarily Mbc in Drosophila) via its proline-rich domain interacting with the SH3 domain, enhancing Rac-specific GEF activity.

Actin cytoskeleton regulation: The DOCK-ELMO-Rac signaling axis drives actin cytoskeletal reorganization through activation of the WAVE/SCAR-Arp2/3 pathway, generating branched actin networks at membrane-proximal sites.

Cell migration: Ced-12/ELMO is essential for directed cell migration, including border follicle cell migration during oogenesis and other migratory processes during development.

Myoblast fusion: Ced-12/ELMO functions in the somatic musculature to drive myoblast fusion through Rac-dependent actin remodeling at fusion foci.

Apoptotic cell engulfment (efferocytosis): By phylogenetic conservation, Ced-12/ELMO functions in phagocytic cells to drive engulfment of apoptotic corpses through Rac-dependent actin polymerization at phagocytic cups.

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