Cited by 187Aquaculture disease management and microbiotaZebrafish Biomedical Research ApplicationsT-cell and B-cell Immunology

Characterization and expression of the recombination activating genes (rag1 and rag2) of zebrafish

Willett, Catherine E., Cherry, Jason J., Steiner, Lisa A.·1997·Immunogenetics

Abstract

The closely linked recombination activating genes, rag1 and rag2, encode components of the recombinase involved in V(D)J recombination of the immunoglobulin and T-cell receptor genes. These genes are expressed together exclusively in immature lymphocytes and are useful markers for following the development of lymphoid tissues. We cloned the rag locus of the zebrafish Danio rerio and sequenced the open reading frames of the rag1 and rag2 genes. Although the gene organization is similar to that in other species, the rag1 gene is unusual in possessing two introns within the coding region. In another teleost, the rainbow trout, the rag1 gene is interrupted by a single intron. Introns are not present in the rag1 gene of any other species examined to date. Expression of both rag1 and rag2 begins late in embryonic development, on day 4, by northern RNA blot analysis. Expression of rag1 was detected in the adult zebrafish thymus, pronephros, mesonephros, and ovary. This pattern of expression is consistent with previous histological studies of adult teleosts, which implicate the kidney as the major site of hematopoiesis and the thymus as the major lymphocyte-containing organ.

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Crossref · 10.1007/s002510050221

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  • In teleosts, the RAG1 gene is divided into exons by either one or two introns.

    “This is consistent with the observation that in teleosts, (bony fish) the RAG1 gene is divided into exons by either one or two introns.”
  • The RAG1 core is split into separate exons at the amino acid position corresponding to position 460 in the human RAG1 gene.

    “As a result, the RAG1 core is split into separate exons at the aa position that corresponds to position 460 in the human RAG1gene [29,34,38].”
  • The acceptor splice site positions in the sea urchin RAG1 core-like proteins closely correspond to those in RAG1 from teleosts, in which RAG1 is split by an intron at position homologous to Gly460 in human RAG1.

    “Remarkably, the acceptor splice site positions in the sea urchin RAG1 core–like proteins closely correspond to those in RAG1 from teleosts (i.e., most of the living ray-finned or bony fish), in which RAG1 is split by an intron at position homologous to Gly460 in human RAG1 [34].”

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Authors
Willett, C. E., Cherry, J. J., & Steiner, L. A.
Affiliations
Massachusetts Institute of Technology (US)
Venue
Immunogenetics
Published
1997-04-09
Volume
45
Issue
6
Pages
394-404
ISSN
  • 0093-7711 (ISSN-L)
  • 1432-1211
OpenAlex
W2002832834
Cited by
187
References
2
Citations by year
2026: 3 · 2025: 2 · 2024: 8 · 2023: 6 · 2022: 5 · 2021: 6 · 2020: 7 · 2019: 8 · 2018: 3 · 2017: 4 · 2016: 3 · 2015: 8 · 2014: 10 · 2013: 5 · 2012: 7
FWCI
3.07
Type
journal article
Language
en
Open access
closed
Locations
  • Immunogenetics (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Allergy and Infectious Diseases (AI 09072, T32AI007463, 2R01AI08054, 5T32-AI-07463, R01AI008054)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › Aquaculture disease management and microbiota
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Zebrafish Biomedical Research Applications
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
Keywords
recombination-activating genes, RAG1, RAG2, zebrafish, V(D)J recombination, immunoglobulin genes, T cell receptor genes, gene expression, lymphoid development, thymus, pronephros, mesonephros, ovary, hematopoiesis, teleosts
MeSH terms
Amino Acid Sequence, Animals, Base Sequence, DNA-Binding Proteins, Gene Expression Regulation, Molecular Sequence Data, Proteins, Recombination, Genetic, Zebrafish, Sequence Alignment, Homeodomain Proteins

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