Variable lymphocyte receptors in hagfish

Zeev Pancer, Nil Ratan Saha, Jun Kasamatsu, Takashi Suzuki, Chris T. Amemiya, Masanori Kasahara, Max D. Cooper

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)

Abstract

A previously uncharacterized type of variable lymphocyte receptors (VLR) was identified recently in the Sea lamprey. This jawless vertebrate generates an extensive VLR repertoire through differential insertion of neighboring diverse leucine-rich repeat (LRR) cassettes into an incomplete germ-line VLR gene. We report here VLR homologs from two additional lamprey species and the presence of two types of VLR genes in hagfish, the only other order of contemporary jawless vertebrates. As in the Sea lamprey, the incomplete hagfish germ-line VLR-A and -B genes are modified in lymphocyte-like cells to generate highly diverse repertoires of VLR-A and -B proteins via a presently undetermined mechanism. This jawless-fish mode of VLR diversification starkly contrasts with the rearrangement of Ig V(D)J gene segments used by all jawed vertebrates to produce diverse repertoires of T and B lymphocyte antigen receptors. The development of two very different strategies for receptor diversification at the dawn of vertebrate evolution ≈500 million years ago attests to the fitness value of a lymphocyte-based system of anticipatory immunity.

Original languageEnglish
Pages (from-to)9224-9229
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume102
Issue number26
DOIs
Publication statusPublished - 2005 Jun 28

Keywords

  • Adaptive immunity
  • Agnatha
  • Jawless fish

ASJC Scopus subject areas

  • General

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