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Diversity and functional specialization of oyster immune cells uncovered by integrative single-cell level investigations.

Sebastien De La Forest Divonne | Juliette Pouzadoux | Oceane Romatif | Caroline Montagnani | Guillaume Mitta | Delphine Destoumieux-Garzón | Benjamin Gourbal | Guillaume M Charriere | Emmanuel Vignal
eLife | 2025

Mollusks are a major component of animal biodiversity and play a critical role in ecosystems and global food security. The Pacific oyster, Crassostrea (Magallana) gigas, is the most farmed bivalve mollusk in the world and is becoming a model species for invertebrate biology. Despite the extensive research on hemocytes, the immune cells of bivalves, their characterization remains elusive. Here, we were able to extensively characterize the diverse hemocytes and identified at least seven functionally distinct cell types and three hematopoietic lineages. A combination of single-cell RNA sequencing, quantitative cytology, cell sorting, functional assays, and pseudo-time analyses was used to deliver a comprehensive view of the distinct hemocyte types. This integrative analysis enabled us to reconcile molecular and cellular data and identify distinct cell types performing specialized immune functions, such as phagocytosis, reactive oxygen species production, copper accumulation, and expression of antimicrobial peptides. This study emphasized the need for more in depth studies of cellular immunity in mollusks and non-model invertebrates and set the ground for further comparative immunology studies at the cellular level.

Pubmed ID: 40343849

Associated grants

  • Agency: Agence Nationale de la Recherche,
    Id: MOSAR-DEF
  • Agency: Agence Nationale de la Recherche,
    Id: DECICOMP
  • Agency: Agence Nationale de la Recherche,
    Id: TRANSCAN
  • Agency: Agence Nationale de la Recherche,
    Id: INFLAMATOX
  • Agency: Institut Français de Recherche pour l'Exploitation de la Mer,
    Id: GT-Huître
  • Agency: Région Occitanie Pyrénées-Méditerranée,
    Id: Hemofight
  • Agency: Agence Nationale de la Recherche,
    Id: ANR-19- CE18-0025
  • Agency: Agence Nationale de la Recherche,
    Id: ANR-19-CE20-0004
  • Agency: Agence Nationale de la Recherche,
    Id: ANR-18-CE35-0009
  • Agency: Agence Nationale de la Recherche,
    Id: ANR-23-CE34-0007

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This is a list of tools and resources that we have found mentioned in this publication.


eggNOG (tool)

RRID:SCR_002456

A database of orthologous groups of genes. The orthologous groups are annotated with functional description lines (derived by identifying a common denominator for the genes based on their various annotations), with functional categories (i.e derived from the original COG/KOG categories). eggNOG's database currently counts 1.7 million orthologous groups in 3686 species, covering over 7.7 million proteins (built from 9.6 million proteins). (Jan 30, 2014)

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RRID:SCR_002760

NIH genetic sequence database that provides annotated collection of all publicly available DNA sequences for almost 280 000 formally described species (Jan 2014) .These sequences are obtained primarily through submissions from individual laboratories and batch submissions from large-scale sequencing projects, including whole-genome shotgun (WGS) and environmental sampling projects. Most submissions are made using web-based BankIt or standalone Sequin programs, and GenBank staff assigns accession numbers upon data receipt. It is part of International Nucleotide Sequence Database Collaboration and daily data exchange with European Nucleotide Archive (ENA) and DNA Data Bank of Japan (DDBJ) ensures worldwide coverage. GenBank is accessible through NCBI Entrez retrieval system, which integrates data from major DNA and protein sequence databases along with taxonomy, genome, mapping, protein structure and domain information, and biomedical journal literature via PubMed. BLAST provides sequence similarity searches of GenBank and other sequence databases. Complete bimonthly releases and daily updates of GenBank database are available by FTP.

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RRID:SCR_003412

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RRID:SCR_004726

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RRID:SCR_005829

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HAMAP (tool)

RRID:SCR_007701

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RRID:SCR_007952

SUPERFAMILY is a database of structural and functional protein annotations for all completely sequenced organisms. The SUPERFAMILY annotation is based on a collection of hidden Markov models, which represent structural protein domains at the SCOP superfamily level. A superfamily groups together domains which have an evolutionary relationship. The annotation is produced by scanning protein sequences from over 1,700 completely sequenced genomes against the hidden Markov models.

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Thermo Fisher Scientific (tool)

RRID:SCR_008452

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RRID:SCR_012773

Integrated database resource consisting of 16 main databases, broadly categorized into systems information, genomic information, and chemical information. In particular, gene catalogs in completely sequenced genomes are linked to higher-level systemic functions of cell, organism, and ecosystem. Analysis tools are also available. KEGG may be used as reference knowledge base for biological interpretation of large-scale datasets generated by sequencing and other high-throughput experimental technologies.

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ggplot2 (tool)

RRID:SCR_014601

Open source software package for statistical programming language R to create plots based on grammar of graphics. Used for data visualization to break up graphs into semantic components such as scales and layers.

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KEGG PATHWAY Database (tool)

RRID:SCR_018145

Reference database for pathway mapping in KEGG Mapper. Collection of manually drawn pathway maps representing knowledge on molecular interaction, reaction and relation networks for metabolism, genetic information processing, environmental information processing, cellular processes, organisms systems, human diseases, drug development.

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RRID:SCR_018685

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RRID:SCR_016341

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RRID:SCR_005828

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STAR (software resource)

RRID:SCR_004463

Software performing alignment of high-throughput RNA-seq data. Aligns RNA-seq reads to reference genome using uncompressed suffix arrays.

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