Lamprey lymphocyte-like cells express homologs of genes involved in immunologically relevant activities of mammalian lymphocytes

Tatiana Uinuk-ool, Werner E. Mayer, Akie Sato, Roman Dongak, Max D. Cooper, Jan Klein

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

To shed light on the origin of adaptive immunity, a CDNA library was prepared from purified lymphocyte-like cells of a jawless vertebrate, the sea lamprey (Petromyzon marinus). Randomly selected cDNA clones were sequenced, and their homologies to proteins in the databases were determined. Of the sequences homologous to proteins involved in immune responses, five were selected for further characterization. Their encoding genes corresponded to loci that in jawed vertebrates are essential for activities of lymphocytes. These activities include regulation of T and B cell stimulation and proliferation (CD45); stabilization of molecular complexes involved in lymphocyte activation, adhesion, migration, and differentiation (CD9/CD81); adaptor functions in signaling leading to the activation of B lymphocytes (BCAP) and T lymphocytes (CAST); and amino acid transport associated with cell activation (CD98). The presence of these genes in the lamprey genome and their expression in lymphocyte-like cells support the notion that these cells perform many of the functions of gnathostome lymphocytes. It reopens the question of the stage jawless fishes reached in the evolution of their immune system.

Original languageEnglish (US)
Pages (from-to)14356-14361
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume99
Issue number22
DOIs
StatePublished - Oct 29 2002

All Science Journal Classification (ASJC) codes

  • General

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