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organism_full: Anopheles gambiae (African malaria mosquito).
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protein_domains: Leu-rich_rpt. (IPR001611); Leu-rich_rpt_typical-subtyp. (IPR003591);
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Question

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

• UniProt Accession: Q5TWL7
• Protein Description: SubName: Full=AGAP006974-PA {ECO:0000313|EMBL:EAL41903.2};
• Gene Information: Name=TOLL9 {ECO:0000313|EMBL:EAL41903.2}; Synonyms=3290281 {ECO:0000313|EnsemblMetazoa:AGAP006974-PA}; ORFNames=AgaP_AGAP006974 {ECO:0000313|EMBL:EAL41903.2};
• Organism (full): Anopheles gambiae (African malaria mosquito).
• Protein Family: Belongs to the Toll-like receptor family.
• Key Domains: Leu-rich_rpt. (IPR001611); Leu-rich_rpt_typical-subtyp. (IPR003591); LRR_dom_sf. (IPR032675); TIR_dom. (IPR000157); Toll_tir_struct_dom_sf. (IPR035897)

MANDATORY VERIFICATION STEPS:

1. Check if the gene symbol "TOLL9" matches the protein description above
2. Verify the organism is correct: Anopheles gambiae (African malaria mosquito).
3. Check if protein family/domains align with what you find in literature
4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'TOLL9' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene TOLL9 (gene ID: TOLL9, UniProt: Q5TWL7) in ANOGA.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Output

Question: You are an expert researcher providing comprehensive, well-cited information.

Provide detailed information focusing on:
1. Key concepts and definitions with current understanding
2. Recent developments and latest research (prioritize 2023-2024 sources)
3. Current applications and real-world implementations
4. Expert opinions and analysis from authoritative sources
5. Relevant statistics and data from recent studies

Format as a comprehensive research report with proper citations. Include URLs and publication dates where available.
Always prioritize recent, authoritative sources and provide specific citations for all major claims.

Gene Research for Functional Annotation

⚠️ CRITICAL: Gene/Protein Identification Context

BEFORE YOU BEGIN RESEARCH: You MUST verify you are researching the CORRECT gene/protein. Gene symbols can be ambiguous, especially for less well-characterized genes from non-model organisms.

Target Gene/Protein Identity (from UniProt):

• UniProt Accession: Q5TWL7
• Protein Description: SubName: Full=AGAP006974-PA {ECO:0000313|EMBL:EAL41903.2};
• Gene Information: Name=TOLL9 {ECO:0000313|EMBL:EAL41903.2}; Synonyms=3290281 {ECO:0000313|EnsemblMetazoa:AGAP006974-PA}; ORFNames=AgaP_AGAP006974 {ECO:0000313|EMBL:EAL41903.2};
• Organism (full): Anopheles gambiae (African malaria mosquito).
• Protein Family: Belongs to the Toll-like receptor family.
• Key Domains: Leu-rich_rpt. (IPR001611); Leu-rich_rpt_typical-subtyp. (IPR003591); LRR_dom_sf. (IPR032675); TIR_dom. (IPR000157); Toll_tir_struct_dom_sf. (IPR035897)

MANDATORY VERIFICATION STEPS:

1. Check if the gene symbol "TOLL9" matches the protein description above
2. Verify the organism is correct: Anopheles gambiae (African malaria mosquito).
3. Check if protein family/domains align with what you find in literature
4. If you find literature for a DIFFERENT gene with the same or similar symbol, STOP

If Gene Symbol is Ambiguous or You Cannot Find Relevant Literature:

DO NOT PROCEED WITH RESEARCH ON A DIFFERENT GENE. Instead:
- State clearly: "The gene symbol 'TOLL9' is ambiguous or literature is limited for this specific protein"
- Explain what you found (e.g., "Found extensive literature on a different gene with the same symbol in a different organism")
- Describe the protein based ONLY on the UniProt information provided above
- Suggest that the protein function can be inferred from domain/family information

Research Target:

Please provide a comprehensive research report on the gene TOLL9 (gene ID: TOLL9, UniProt: Q5TWL7) in ANOGA.

The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.

You should prioritize authoritative reviews and primary scientific literature when conducting research. You can supplement
this with annotations you find in gene/protein databases, but these can be outdated or inaccurate.

We are specifically interested in the primary function of the gene - for enzymes, what reaction is catalyzed, and what is the substrate specificity? For transporters, what is the substrate? For structural proteins or adapters, what is the broader structural role? For signaling molecules, what is the role in the pathway.

We are interested in where in or outside the cell the gene product carries out its function.

We are also interested in the signaling or biochemical pathways in which the gene functions. We are less interested in broad pleiotropic effects, except where these elucidate the precise role.

Include evidence where possible. We are interested in both experimental evidence as well as inference from structure, evolution, or bioinformatic analysis. Precise studies should be prioritized over high-throughput, where available.

Research plan and status
- Identity verification (completed): The target is TOLL9 from Anopheles gambiae, UniProt Q5TWL7, annotated as a Toll-like receptor family protein with extracellular leucine-rich repeats (LRR), a single-pass transmembrane segment, and an intracellular TIR domain. Comparative analyses of mosquito Toll/TLRs confirm this canonical architecture for the Toll family and place mosquito TOLL9 within a conserved TLR subfamily, consistent with the UniProt domain annotations and family assignment (rhodes2018tollsignalingimmune pages 109-113, rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 122-127).
- Evidence gathering (completed): Recent primary and review literature on mosquito Toll signaling, with emphasis on 2023–2024 sources, was assembled; direct functional data specific to Anopheles gambiae TOLL9 (AGAP006974) remain scarce, so functional inferences are drawn from mosquito Toll/TLR comparative genomics and from recent functional work on Toll pathway activity in Anopheles spp. (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9, zmarlak2024theanophelesleucinerich pages 1-2, zmarlak2024theanophelesleucinerich pages 10-12), together with comprehensive phylogenetic/architectural analyses of Toll receptors in anophelines (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 109-113, rhodes2018tollsignalingimmune pages 127-132, rhodes2018tollsignalingimmune pages 100-109).

Executive summary
- Gene/protein identity: TOLL9 (AGAP006974; UniProt Q5TWL7) encodes a single-pass type I membrane receptor of the Toll-like receptor family bearing an extracellular LRR domain architecture and an intracellular TIR domain. This is congruent with mosquito TLR/Toll architectures described across anophelines (rhodes2018tollsignalingimmune pages 109-113, rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).
- Current understanding: Direct Anopheles gambiae TOLL9 functional data are limited. However, mosquito Toll pathway activation is a well-established anti-pathogen mechanism that reduces Plasmodium infection, with recent in vivo evidence in 2024 showing Rel1 (NF-κB) dependence in Anopheles stephensi; the conserved intracellular module (Myd88–Tube–Pelle–Cactus–Rel1) supports inference that An. gambiae TOLL9 signals into this pathway (rhodes2018tollsignalingimmune pages 109-113, liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9). Phylogenetic analyses highlight a conserved TOLL9 subfamily with species-specific duplications (TOLL9A/9B) and divergence of ectodomains that likely tunes ligand specificity while preserving TIR-based signaling (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).

1) Key concepts and definitions
- Toll/TLR architecture and signaling: Toll receptors in insects are LRR-containing type I membrane proteins with an intracellular TIR domain. Canonical activation involves extracellular proteolytic activation of the cytokine Spätzle, receptor dimerization, and recruitment of Myd88, Tube, and Pelle. Pelle-mediated degradation of Cactus frees NF-κB factors (e.g., DIF/REL1) to drive immune gene transcription (rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 31-35, rhodes2018tollsignalingimmune pages 109-113). In Drosophila, Toll-9 is a distinctive sccTLR; mosquitoes mostly encode mcc-type ectodomains but nevertheless share the same overall transmembrane/TIR architecture (rhodes2018tollsignalingimmune pages 109-113).
- Mosquito TOLL9 subfamily: Across mosquitoes, TOLL9 comprises a conserved subfamily. Some lineages possess two paralogs (TOLL9A and TOLL9B). In anophelines, duplications are reported in An. albimanus and An. darlingi, with TOLL9B sisters clustering with culicine TOLL9B and showing pronounced divergence in ectodomain LRR arrangement and low amino-acid identity versus TOLL9A, while TIR phylogenies place all within TOLL9 (suggesting conserved signaling, divergent recognition) (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).
- Pathway placement: Intracellular Toll pathway members show strong 1:1 orthology across anophelines; thus, any Toll receptor including TOLL9 is expected to localize to the plasma membrane and to signal via Myd88–Tube–Pelle–Cactus–Rel1 within the cytosol/nucleus, modulating antimicrobial and complement-like effector outputs (rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 31-35, rhodes2018tollsignalingimmune pages 109-113).

2) Recent developments and latest research (priority 2023–2024)
- Toll pathway activation reduces malaria parasite burden in vivo. In 2024, dihydroartemisinin exposure in An. stephensi increased transcription and protein expression of Toll pathway components (Tube, MyD88, Rel1) and anti-Plasmodium effectors (e.g., TEP1, LRIM1, APL1C); Rel1 knockdown abrogated the DHA-induced reduction in oocysts and sporozoites, functionally linking Toll signaling to decreased vector competence (Parasites & Vectors, Oct 2024; https://doi.org/10.1186/s13071-024-06497-x) (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9).
- Pathogen recognition by secreted LRRs and complement-like killing. In 2024, APL1C (a secreted LRR protein) and LRIM1 were shown to directly bind P. berghei ookinetes (binding persists even after TEP1 depletion), and APL1C also bound sporozoites, limiting salivary gland invasion; these LRRs operate with the complement-like TEP1 system to kill parasites (PLOS Pathogens, Feb 14, 2024; https://doi.org/10.1371/journal.ppat.1012008) (zmarlak2024theanophelesleucinerich pages 1-2, zmarlak2024theanophelesleucinerich pages 15-16, zmarlak2024theanophelesleucinerich pages 10-12). While these are soluble LRR proteins, their LRR-based recognition reinforces a model in which LRR architecture in the mosquito immune system mediates specific pathogen interactions that could, by analogy, be relevant to the specificity of TLR ectodomains such as TOLL9.
- Comparative Toll/TLR landscape in Anopheles. Prior comparative work mapped TLR repertoires across 20–21 mosquito genomes, establishing that TOLL6–TOLL11 are generally conserved with 1:1 orthology, whereas TOLL1/5 underwent multiple duplications in the gambiae complex; TOLL9 duplications and structural divergence of ectodomains highlight potential diversification of ligand recognition while TIR domains remain within the TOLL9 clade (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132, rhodes2018tollsignalingimmune pages 100-109). These findings align with domain expectations for TOLL9 in An. gambiae and suggest species-specific tuning of ligand recognition at the ectodomain level.

3) Current applications and real-world implementations
- Vector control by immune pathway modulation. Manipulating mosquito Toll signaling can reduce parasite development. The 2024 in vivo study demonstrates that pharmacologic stimulation (dihydroartemisinin) increases Toll activity and reduces Plasmodium oocyst and sporozoite numbers in Anopheles, with Rel1 required for the effect, suggesting feasibility of small-molecule or genetic strategies that boost Toll signaling to reduce transmission (https://doi.org/10.1186/s13071-024-06497-x) (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9). Reviews of Anopheles–Plasmodium interactions emphasize Toll pathway roles in hemocyte recruitment, TEP1-dependent melanization, and oocyst control, supporting its translational relevance as a target for transmission-blocking strategies (https://doi.org/10.1371/journal.ppat.1012965) (saab2025advancesinthe pages 10-12).
- Systems perspective for effector orientation. The discovery that secreted LRRs APL1C/LRIM1 directly bind parasites and guide TEP1 highlights opportunities to exploit recognition–effector coupling; these principles may inform design of engineered recognition molecules or induction schemes that mobilize complement-like responses in vectors (https://doi.org/10.1371/journal.ppat.1012008) (zmarlak2024theanophelesleucinerich pages 1-2, zmarlak2024theanophelesleucinerich pages 15-16, zmarlak2024theanophelesleucinerich pages 10-12).

4) Expert opinions and analysis from authoritative sources
- Authoritative reviews synthesize that the Toll pathway is a central anti-pathogen axis in mosquitoes, coordinating antimicrobial peptides, complement-like factors, melanization, and hemocyte functions. The intracellular signaling module is highly conserved, supporting extrapolation from one anopheline to another, although extracellular recognition and protease cascades can be lineage-specific (rhodes2018tollsignalingimmune pages 31-35, rhodes2018tollsignalingimmune pages 109-113). Recent reviews of Anopheles–Plasmodium interactions reiterate Toll’s role in limiting parasite stages and identify Toll activation as a promising avenue for transmission-blocking strategies (https://doi.org/10.1371/journal.ppat.1012965) (saab2025advancesinthe pages 10-12). A 2023 review on arbovirus recognition situates Toll family members (including insect Toll-9 examples) among mosquito PRRs, evidencing diversified recognition and pathway uses across viruses and parasites (https://doi.org/10.3390/biom13071159) (prince2023recognitionofarboviruses pages 14-15).

5) Relevant statistics and data from recent studies
- In vivo An. stephensi challenge experiments showed that DHA exposure significantly reduced P. yoelii oocyst and sporozoite numbers; the protective effect was lost upon Rel1 knockdown, mechanistically implicating Toll signaling. This provides functional, quantitative evidence that activating Toll signaling reduces parasite burden in mosquitoes (https://doi.org/10.1186/s13071-024-06497-x) (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9). Zmarlak et al. quantified APL1C binding frequencies to P. berghei ookinetes and demonstrated increased infection prevalence/intensity upon APL1C silencing, quantifying the contribution of LRR recognition to parasite control (https://doi.org/10.1371/journal.ppat.1012008) (zmarlak2024theanophelesleucinerich pages 10-12).

Function, localization, and pathway role of An. gambiae TOLL9 (AGAP006974; Q5TWL7)
- Subcellular localization and domain composition: By family/domain conservation, TOLL9 is a plasma-membrane receptor with extracellular LRRs and an intracellular TIR domain. This architecture is shared across mosquito Toll receptors and specifically within TOLL9 orthologs, with ectodomain LRR arrangements that can vary between paralogs but preserved TIR signaling modules (rhodes2018tollsignalingimmune pages 109-113, rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).
- Primary molecular role: As a Toll receptor, TOLL9 is expected to function as a signal-transducing PRR system: upon ligand engagement (likely via processed Spätzle family cytokines; insects can display multi-Spätzle/Toll pairing), it recruits Myd88–Tube–Pelle, leading to Cactus degradation and nuclear Rel1 activation, inducing effectors such as antimicrobial peptides, complement-like factors (e.g., TEP1), and regulators of melanization/hemocyte responses (rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 31-35, rhodes2018tollsignalingimmune pages 109-113). Given the divergence documented in TOLL9 ectodomains among mosquitoes, An. gambiae TOLL9 may have distinct ligand affinities compared with culicine or Nyssorhynchus TOLL9 paralogs (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).
- Pathway integration in Anopheles immunity: Strong experimental evidence in Anopheles spp. shows that Toll pathway activation (Rel1-dependent) reduces Plasmodium infection and shapes hemocyte/complement-like effector responses; thus, An. gambiae TOLL9 likely contributes as one of several Toll receptors that detect endogenous cytokines (Spätzle) induced by infection/injury and trigger Rel1-dependent anti-Plasmodium programs (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9, saab2025advancesinthe pages 10-12). While secreted LRRs (APL1C/LRIM1) provide direct parasite recognition and orient TEP1 deposition, Toll receptors provide transcriptional control of many of these effector systems, placing TOLL9 in the upstream signaling layer rather than as a direct opsonin (zmarlak2024theanophelesleucinerich pages 1-2, rhodes2018tollsignalingimmune pages 31-35).

Critical note on symbol ambiguity and evidence limits
- The symbol “TOLL9” is used in multiple insects and can denote paralog pairs (TOLL9A/9B) in some mosquitoes. Comparative analyses indicate that An. gambiae generally retains a single-copy TOLL9 within the conserved TOLL9 subfamily; however, direct functional experiments specifically tying AGAP006974 (TOLL9) to a defined ligand or phenotype in An. gambiae were not identified in the recent literature surveyed here. Therefore, functional roles are inferred from conserved domain architecture, canonical Toll signaling, and recent Anopheles Toll-pathway functional studies. All inferences are flagged as homology- and pathway-based until AGAP006974-specific experimental validation becomes available (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).

Embedded summary table of key recent sources
| Year | Study (first author et al.) | Species / Context | Key finding relevant to Toll / TLRs | Relevance to TOLL9 inference | Journal | DOI / URL |
|------|-----------------------------|-------------------|-------------------------------------|------------------------------|---------|-----------|
| 2024 | Liu et al. | Anopheles stephensi; Plasmodium yoelii infection | Dihydroartemisinin (DHA) treatment upregulates Toll-pathway genes (Tube, MyD88, Rel1) and antimicrobial effectors; Rel1 RNAi abolishes DHA-mediated refractoriness to Plasmodium (functional necessity of Toll signaling) (liu2024dihydroartemisininsuppressesthe pages 1-2) | Demonstrates that Toll (Rel1) activation reduces Plasmodium survival in Anopheles, supporting the plausibility that An. gambiae TOLL family members (including TOLL9) can mediate anti-Plasmodium immunity by signaling to Rel1 (liu2024dihydroartemisininsuppressesthe pages 8-9) | Parasites & Vectors | https://doi.org/10.1186/s13071-024-06497-x (Oct 2024) |
| 2024 | Zmarlak et al. | Anopheles spp.; Plasmodium berghei and P. falciparum | Secreted LRR proteins APL1C and LRIM1 bind P. berghei ookinetes/sporozoites and work with TEP1 for complement-like killing; APL1C shows species-specific recognition (zmarlak2024theanophelesleucinerich pages 1-2) | Shows LRR-mediated pathogen recognition and coupling to complement-like effectors in Anopheles hemolymph; by analogy, transmembrane LRR TLRs (e.g., TOLL9) may provide membrane-associated recognition/signaling roles or cooperate with soluble LRRs (zmarlak2024theanophelesleucinerich pages 10-12) | PLOS Pathogens | https://doi.org/10.1371/journal.ppat.1012008 (Feb 14, 2024) |
| 2023 | Prince et al. | Review: arbovirus recognition across mosquito species | Summarizes mosquito PRRs and TLR/Toll-family roles in antiviral/antiparasite responses; cites diverse Toll paralogs including insect Toll-9 examples and structural/ligand studies (prince2023recognitionofarboviruses pages 14-15) | Provides comparative context: Toll-9 family members in insects have been implicated in immunity and may show variable ligand specificity, supporting cautious homology-based inference for An. gambiae TOLL9 | Biomolecules | https://doi.org/10.3390/biom13071159 (Jul 2023) |
| 2018 | Rhodes (V.L.M.) | Comparative genomic/phylogenetic analysis across mosquito species | Detailed TLR/Toll-family phylogeny: conserved architecture (LRRs + TM + TIR), reported TOLL9 duplications in some species (TOLL9A vs TOLL9B) with divergent ectodomains but conserved TIR domains (rhodes2018tollsignalingimmune pages 122-127) | Indicates TOLL9 in Anopheles belongs to a conserved subfamily with potential paralogs; extracellular LRR divergence implies possible altered ligand specificity while conserved TIR suggests retained downstream signaling capacity—key for inferring AGAP006974 function by homology (rhodes2018tollsignalingimmune pages 127-132) | Dissertation / comparative analysis | (2018; genome data from VectorBase) |
| 2025 | Saab et al. | Anopheles–Plasmodium interactions (review) | Toll pathway implicated in anti-oocyst defenses: hemocyte recruitment, TEP1-dependent melanization, and effects of CSP disruption on Toll activation and parasite killing (saab2025advancesinthe pages 10-12) | Reinforces functional role of Toll signaling in limiting Plasmodium oocyst/sporozoite stages in Anopheles, supporting a model where TOLL9 could contribute to these defenses either directly or via pathway modulation | PLOS Pathogens | https://doi.org/10.1371/journal.ppat.1012965 (Mar 31, 2025) |

Table: A concise table of recent, relevant studies (2018–2025) summarizing Toll/TLR findings in mosquitoes and how each study informs inference about Anopheles gambiae TOLL9 (AGAP006974) by homology and functional context.

References with URLs/dates
- Liu et al., 2024, Parasites & Vectors (Oct 2024). Dihydroartemisinin reduces Plasmodium in Anopheles stephensi by activating Toll signaling; Rel1 knockdown abrogates protection. DOI: 10.1186/s13071-024-06497-x. URL: https://doi.org/10.1186/s13071-024-06497-x (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9).
- Zmarlak et al., 2024, PLOS Pathogens (Feb 14, 2024). APL1C/LRIM1 secreted LRRs bind P. berghei ookinetes and sporozoites; couple to TEP1 for killing. DOI: 10.1371/journal.ppat.1012008. URL: https://doi.org/10.1371/journal.ppat.1012008 (zmarlak2024theanophelesleucinerich pages 1-2, zmarlak2024theanophelesleucinerich pages 15-16, zmarlak2024theanophelesleucinerich pages 10-12).
- Prince et al., 2023, Biomolecules (Jul 2023). Review of mosquito PRR recognition of arboviruses, situating Toll/TLR (including insect Toll-9) within vector immunity. DOI: 10.3390/biom13071159. URL: https://doi.org/10.3390/biom13071159 (prince2023recognitionofarboviruses pages 14-15).
- Rhodes, 2018, Toll signaling in anopheline mosquitoes (comparative phylogenomics/annotation across 20–21 mosquito genomes): conserved Toll architecture, TOLL9 subfamily, and duplications with divergent ectodomains; conserved TIR-based signaling; conserved intracellular module and functional Toll pathway roles in Anopheles (vectorbase data). No DOI available here; genome resource: VectorBase (www.vectorbase.org) (rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 109-113, rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132, rhodes2018tollsignalingimmune pages 31-35).
- Saab et al., 2025, PLOS Pathogens (Mar 31, 2025). Review highlighting Toll’s role in anti-oocyst defenses, hemocyte recruitment, and melanization during Anopheles–Plasmodium interactions. DOI: 10.1371/journal.ppat.1012965. URL: https://doi.org/10.1371/journal.ppat.1012965 (saab2025advancesinthe pages 10-12).

Conclusions and future directions for AGAP006974 (TOLL9)
- Identity and localization: A membrane TLR with extracellular LRRs and intracellular TIR; expected to signal via the conserved Myd88–Tube–Pelle–Cactus–Rel1 axis in Anopheles tissues relevant to infection (midgut epithelium, hemocytes, fat body) (rhodes2018tollsignalingimmune pages 109-113).
- Functional role (inferred): A signaling receptor upstream of Rel1-dependent transcriptional programs that mobilize antimicrobial peptides, complement-like TEP1/LRIM1/APL1C modules, and melanization/hemocyte responses; in concert with soluble LRR recognition, contributes to limiting Plasmodium development and transmission potential (liu2024dihydroartemisininsuppressesthe pages 1-2, liu2024dihydroartemisininsuppressesthe pages 8-9, saab2025advancesinthe pages 10-12, zmarlak2024theanophelesleucinerich pages 1-2, rhodes2018tollsignalingimmune pages 31-35).
- Specificity and evolution: Ectodomain divergence within the TOLL9 family across mosquitoes suggests potential differences in ligand (Spätzle isoforms) or co-receptor interactions, warranting AGAP006974-focused ligand-binding and signaling assays in An. gambiae to define exact input specificity and physiological roles (rhodes2018tollsignalingimmune pages 122-127, rhodes2018tollsignalingimmune pages 127-132).
- Experimental gaps: No direct ligand, loss-of-function, or overexpression phenotypes specific to AGAP006974 were identified in recent literature. Priority experiments include CRISPR/Cas9 knockout or tissue-specific RNAi of AGAP006974 in An. gambiae with readouts of Rel1-dependent transcription, Plasmodium burden across life stages, and interactions with Spätzle isoforms and extracellular protease cascades (rhodes2018tollsignalingimmune pages 100-109, rhodes2018tollsignalingimmune pages 31-35, rhodes2018tollsignalingimmune pages 109-113).

References

1. (rhodes2018tollsignalingimmune pages 109-113): VLM Rhodes. Toll signaling immune function and evolution in anopheline mosquitoes. Unknown journal, 2018.

2. (rhodes2018tollsignalingimmune pages 100-109): VLM Rhodes. Toll signaling immune function and evolution in anopheline mosquitoes. Unknown journal, 2018.

3. (rhodes2018tollsignalingimmune pages 122-127): VLM Rhodes. Toll signaling immune function and evolution in anopheline mosquitoes. Unknown journal, 2018.

4. (liu2024dihydroartemisininsuppressesthe pages 1-2): Tingting Liu, Dan Zheng, Jing Wang, Xin Li, Shasha Yu, Zhilong Liu, Feifei Zheng, Caizhi Zhao, Xuesen Yang, and Ying Wang. Dihydroartemisinin suppresses the susceptibility of anopheles stephensi to plasmodium yoelii by activating the toll signaling pathway. Parasites & Vectors, Oct 2024. URL: https://doi.org/10.1186/s13071-024-06497-x, doi:10.1186/s13071-024-06497-x. This article has 1 citations and is from a peer-reviewed journal.

5. (liu2024dihydroartemisininsuppressesthe pages 8-9): Tingting Liu, Dan Zheng, Jing Wang, Xin Li, Shasha Yu, Zhilong Liu, Feifei Zheng, Caizhi Zhao, Xuesen Yang, and Ying Wang. Dihydroartemisinin suppresses the susceptibility of anopheles stephensi to plasmodium yoelii by activating the toll signaling pathway. Parasites & Vectors, Oct 2024. URL: https://doi.org/10.1186/s13071-024-06497-x, doi:10.1186/s13071-024-06497-x. This article has 1 citations and is from a peer-reviewed journal.

6. (zmarlak2024theanophelesleucinerich pages 1-2): Natalia Marta Zmarlak, Catherine Lavazec, Emma Brito-Fravallo, Corinne Genève, Eduardo Aliprandini, Manuela Camille Aguirre-Botero, Kenneth D. Vernick, and Christian Mitri. The anopheles leucine-rich repeat protein apl1c is a pathogen binding factor recognizing plasmodium ookinetes and sporozoites. PLOS Pathogens, 20:e1012008, Feb 2024. URL: https://doi.org/10.1371/journal.ppat.1012008, doi:10.1371/journal.ppat.1012008. This article has 6 citations and is from a highest quality peer-reviewed journal.

7. (zmarlak2024theanophelesleucinerich pages 10-12): Natalia Marta Zmarlak, Catherine Lavazec, Emma Brito-Fravallo, Corinne Genève, Eduardo Aliprandini, Manuela Camille Aguirre-Botero, Kenneth D. Vernick, and Christian Mitri. The anopheles leucine-rich repeat protein apl1c is a pathogen binding factor recognizing plasmodium ookinetes and sporozoites. PLOS Pathogens, 20:e1012008, Feb 2024. URL: https://doi.org/10.1371/journal.ppat.1012008, doi:10.1371/journal.ppat.1012008. This article has 6 citations and is from a highest quality peer-reviewed journal.

8. (rhodes2018tollsignalingimmune pages 127-132): VLM Rhodes. Toll signaling immune function and evolution in anopheline mosquitoes. Unknown journal, 2018.

9. (rhodes2018tollsignalingimmune pages 31-35): VLM Rhodes. Toll signaling immune function and evolution in anopheline mosquitoes. Unknown journal, 2018.

10. (zmarlak2024theanophelesleucinerich pages 15-16): Natalia Marta Zmarlak, Catherine Lavazec, Emma Brito-Fravallo, Corinne Genève, Eduardo Aliprandini, Manuela Camille Aguirre-Botero, Kenneth D. Vernick, and Christian Mitri. The anopheles leucine-rich repeat protein apl1c is a pathogen binding factor recognizing plasmodium ookinetes and sporozoites. PLOS Pathogens, 20:e1012008, Feb 2024. URL: https://doi.org/10.1371/journal.ppat.1012008, doi:10.1371/journal.ppat.1012008. This article has 6 citations and is from a highest quality peer-reviewed journal.

11. (saab2025advancesinthe pages 10-12): Sally A. Saab, Victor Cardoso-Jaime, Mary Kefi, and George Dimopoulos. Advances in the dissection of anopheles–plasmodium interactions. PLOS Pathogens, 21:e1012965, Mar 2025. URL: https://doi.org/10.1371/journal.ppat.1012965, doi:10.1371/journal.ppat.1012965. This article has 7 citations and is from a highest quality peer-reviewed journal.

12. (prince2023recognitionofarboviruses pages 14-15): Brian C. Prince, Elizabeth Walsh, Tran Zen B. Torres, and Claudia Rückert. Recognition of arboviruses by the mosquito immune system. Biomolecules, 13:1159, Jul 2023. URL: https://doi.org/10.3390/biom13071159, doi:10.3390/biom13071159. This article has 16 citations and is from a poor quality or predatory journal.

Citations

1. rhodes2018tollsignalingimmune pages 109-113
2. saab2025advancesinthe pages 10-12
3. prince2023recognitionofarboviruses pages 14-15
4. zmarlak2024theanophelesleucinerich pages 10-12
5. liu2024dihydroartemisininsuppressesthe pages 1-2
6. liu2024dihydroartemisininsuppressesthe pages 8-9
7. zmarlak2024theanophelesleucinerich pages 1-2
8. rhodes2018tollsignalingimmune pages 122-127
9. rhodes2018tollsignalingimmune pages 127-132
10. rhodes2018tollsignalingimmune pages 100-109
11. rhodes2018tollsignalingimmune pages 31-35
12. zmarlak2024theanophelesleucinerich pages 15-16
13. https://doi.org/10.1186/s13071-024-06497-x
14. https://doi.org/10.1371/journal.ppat.1012008
15. https://doi.org/10.1371/journal.ppat.1012965
16. https://doi.org/10.3390/biom13071159
17. https://doi.org/10.1186/s13071-024-06497-x,
18. https://doi.org/10.1371/journal.ppat.1012008,
19. https://doi.org/10.1371/journal.ppat.1012965,
20. https://doi.org/10.3390/biom13071159,