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The DBL-1/TGF-β signaling pathway tailors behavioral and molecular host responses to a variety of bacteria in Caenorhabditis elegans.

Bhoomi Madhu | Mohammed Farhan Lakdawala | Tina L Gumienny
eLife | 2023

Generating specific, robust protective responses to different bacteria is vital for animal survival. Here, we address the role of transforming growth factor β (TGF-β) member DBL-1 in regulating signature host defense responses in Caenorhabditis elegans to human opportunistic Gram-negative and Gram-positive pathogens. Canonical DBL-1 signaling is required to suppress avoidance behavior in response to Gram-negative, but not Gram-positive bacteria. We propose that in the absence of DBL-1, animals perceive some bacteria as more harmful. Animals activate DBL-1 pathway activity in response to Gram-negative bacteria and strongly repress it in response to select Gram-positive bacteria, demonstrating bacteria-responsive regulation of DBL-1 signaling. DBL-1 signaling differentially regulates expression of target innate immunity genes depending on the bacterial exposure. These findings highlight a central role for TGF-β in tailoring a suite of bacteria-specific host defenses.

Pubmed ID: 37750680

Associated grants

  • Agency: Office of Extramural Research, National Institutes of Health,
    Id: R01GM097591
  • Agency: Jane Nelson Institute for Women's Leadership,
    Id: internal grant
  • Agency: TWU Research Enhancement Program,
    Id: faculty grant
  • Agency: TWU Experiential Learning Scholar Award,
    Id: student funding
  • Agency: Texas Woman's University,
    Id: TWU Research Enhancement Program (faculty grant)
  • Agency: Texas Woman's University,
    Id: TWU Experiential Learning Scholar Award (student funding)

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ATCC (tool)

RRID:SCR_001672

Global nonprofit biological resource center (BRC) and research organization that provides biological products, technical services and educational programs to private industry, government and academic organizations. Its mission is to acquire, authenticate, preserve, develop and distribute biological materials, information, technology, intellectual property and standards for the advancement and application of scientific knowledge. The primary purpose of ATCC is to use its resources and experience as a BRC to become the world leader in standard biological reference materials management, intellectual property resource management and translational research as applied to biomaterial development, standardization and certification. ATCC characterizes cell lines, bacteria, viruses, fungi and protozoa, as well as develops and evaluates assays and techniques for validating research resources and preserving and distributing biological materials to the public and private sector research communities.

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Caenorhabditis Genetics Center (tool)

RRID:SCR_007341

Center that acquires, maintains, and distributes genetic stocks and information about stocks of the small free-living nematode Caenorhabditis elegans for use by investigators initiating or continuing research on this genetic model organism. A searchable strain database, general information about C. elegans, and links to key Web sites of use to scientists, including WormBase, WormAtlas, and WormBook are available.

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DR1369 (organism)

RRID:WB-STRAIN:WBStrain00006371

Caenorhabditis elegans with name sma-4(e729) III. from WB.

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CB491 (organism)

RRID:WB-STRAIN:WBStrain00004173

Caenorhabditis elegans with name sma-3(e491) III. from WB.

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OP50 (organism)

RRID:WB-STRAIN:WBStrain00041969

Escherichia coli with name E. coli. from WB.

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LW5558 (organism)

RRID:WB-STRAIN:WBStrain00026352

Caenorhabditis elegans with name sma-4(jj278) III. from WB.

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SAL143 (organism)

RRID:WB-STRAIN:WBStrain00033896

Caenorhabditis elegans with name pha-1(e2123) III; denEx21. from WB.

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CB6710 (organism)

RRID:WB-STRAIN:WBStrain00004705

Caenorhabditis elegans with name unc-119(ed3) III; eEx650. from WB.

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SAL139 (organism)

RRID:WB-STRAIN:WBStrain00033894

Caenorhabditis elegans with name pha-1(e2123) III; denEx17. from WB.

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NU3 (organism)

RRID:WB-STRAIN:WBStrain00029114

Caenorhabditis elegans with name dbl-1(nk3) V. from WB.

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CB502 (organism)

RRID:WB-STRAIN:WBStrain00004174

Caenorhabditis elegans with name sma-2(e502) III. from WB.

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LW2436 (organism)

RRID:WB-STRAIN:WBStrain00026351

Caenorhabditis elegans with name jjIs2277. from WB.

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SAL148 (organism)

RRID:WB-STRAIN:WBStrain00033899

Caenorhabditis elegans with name pha-1(e2123) III; denEx26. from WB.

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CF3556 (organism)

RRID:WB-STRAIN:WBStrain00004921

Caenorhabditis elegans with name agIs6. from WB.

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N2 (organism)

RRID:WB-STRAIN:WBStrain00000001

Caenorhabditis elegans with name Caenorhabditis elegans wild isolate. from WB.

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