Abstract

By a combination of rapid amplification of cDNA ends (RACE) and reverse transcription-polymerase chain reaction (RT-PCR) we identified three T cell receptor delta variable (TRDV) subgroups and five joining (TRDJ) genes expressed in spleen, tonsils and blood of Camelus dromedarius. We provide evidence that the high diversity in sequence and length of the third complementarity determining region (CDR3) is a major component of the TR delta chain variability. Moreover, the identification of the corresponding germline genes allowed us to find out for the first time in a mammalian organism that productively rearranged TRDV genes undergo somatic mutation: the mutation rate of the analysed TRDV4 region is 0.013 per base pair in spleen and 0.009 in blood. The point mutations are scattered throughout the length of the variable domain from framework region FR1 to FR4. This random distribution of the amino acid changes, instead of its CDR clustering observed in immunoglobulins (IG), indicates that somatic mutation in dromedary, while contributing to the development of the TRDV repertoire, is not under antigen selection. © 2011 Elsevier Ltd.

Autore Pugliese

• Pesole Graziano

Tutti gli autori

• Antonacci R.; Mineccia M.; Lefranc M.P.; Ashmaoui H.M.E.; Lanave C.; Piccinni B.; Pesole G.; Hassanane M.S. Massari S.; Ciccarese S.

Titolo volume/Rivista

Molecular immunology

Anno di pubblicazione

2011

ISSN

0161-5890

ISBN

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Numero di citazioni Wos

Nessuna citazione

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Settori ERC

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Codici ASJC

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