Dataset Information

Genomic donor cassette sharing during VLRA and VLRC assembly in jawless vertebrates.

ABSTRACT: Lampreys possess two T-like lymphocyte lineages that express either variable lymphocyte receptor (VLR) A or VLRC antigen receptors. VLRA(+) and VLRC(+) lymphocytes share many similarities with the two principal T-cell lineages of jawed vertebrates expressing the ?? and ?? T-cell receptors (TCRs). During the assembly of VLR genes, several types of genomic cassettes are inserted, in step-wise fashion, into incomplete germ-line genes to generate the mature forms of antigen receptor genes. Unexpectedly, the structurally variable components of VLRA and VLRC receptors often possess partially identical sequences; this phenomenon of module sharing between these two VLR isotypes occurs in both lampreys and hagfishes. By contrast, VLRA and VLRC molecules typically do not share their building blocks with the structurally analogous VLRB receptors that are expressed by B-like lymphocytes. Our studies reveal that VLRA and VLRC germ-line genes are situated in close proximity to each other in the lamprey genome and indicate the interspersed arrangement of isotype-specific and shared genomic donor cassettes; these features may facilitate the shared cassette use. The genomic structure of the VLRA/VLRC locus in lampreys is reminiscent of the interspersed nature of the TCRA/TCRD locus in jawed vertebrates that also allows the sharing of some variable gene segments during the recombinatorial assembly of TCR genes.

SUBMITTER: Das S

PROVIDER: S-EPMC4205630 | biostudies-literature | 2014 Oct

REPOSITORIES: biostudies-literature

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Genomic donor cassette sharing during VLRA and VLRC assembly in jawless vertebrates.

Das Sabyasachi S Li Jianxu J Holland Stephen J SJ Iyer Lakshminarayan M LM Hirano Masayuki M Schorpp Michael M Aravind L L Cooper Max D MD Boehm Thomas T

Proceedings of the National Academy of Sciences of the United States of America 20140916 41

Lampreys possess two T-like lymphocyte lineages that express either variable lymphocyte receptor (VLR) A or VLRC antigen receptors. VLRA(+) and VLRC(+) lymphocytes share many similarities with the two principal T-cell lineages of jawed vertebrates expressing the αβ and γδ T-cell receptors (TCRs). During the assembly of VLR genes, several types of genomic cassettes are inserted, in step-wise fashion, into incomplete germ-line genes to generate the mature forms of antigen receptor genes. Unexpecte ...[more]

PMID: 25228758

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Dataset Information

Genomic donor cassette sharing during VLRA and VLRC assembly in jawless vertebrates.

Publications

Genomic donor cassette sharing during VLRA and VLRC assembly in jawless vertebrates.

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