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Gene discovery at the human T-cell receptor α/δ locus

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Abstract

The human T-cell receptor (TCR) α/δ variable loci are interspersed on the chromosome 14q11 and consist of 57 intergenic spaces ranging from 4 to 100 kb in length. To elucidate the evolutionary history of this locus, we searched the intergenic spaces of all TCR α/δ variable (TRAV/DV) genes for pseudogenes and potential protein-coding genes. We applied direct open reading frame (ORF) searches, an exon-finding algorithm and comparative genomics. Two TRAV/DV pseudogenes were discovered bearing 80 and 65% sequence similarity to TRAV14DV4 and TRAV9-1/9-2 genes, respectively. A gene bearing 85% sequence identity to B lymphocyte activation-related protein, BC-1514, upstream of TRAV26-2 was also discovered. This ORF (BC-1514tcra) is a member of a gene family whose evolutionary history and function are not known. In total, 36 analogs of this gene exist in the human, the chimpanzee, the Rhesus monkey, the frog and the zebrafish. Phylogenetic analyses show convergent evolution of these genes. Assays for the expression of BC-1514tcra revealed transcripts in the bone marrow, thymus, spleen, and small intestine. These assays also showed the expression of another analog to BC-1514, found on chromosome 5 in the bone marrow and thymus RNA. The existence of at least 17 analogs at various locations in the human genome and in nonsyntenic chromosomes of the chimpanzee suggest that BC-1514tcra, along with its analogs may be transposable elements with evolved function(s). The identification of conserved putative serine phosphorylation sites provide evidence of their possible role(s) in signal transduction events involved in B cell development and differentiation.

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Acknowledgment

This study was supported by funds from the Canadian Institutes of Health Research to G.W. The authors would like to thank L. Cunningham, T. Da Sylva, and L. Rumfelt for their helpful comments and discussions on this work.

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  1. Department of Biology, Farquharson Building, Room 136, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, USA

    Marsha R. Haynes

  2. Faculty of Science and Engineering, York University, 4700 Keele Street, Toronto, ON, M3J 1P3, Canada

    Gillian E. Wu

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Correspondence to Marsha R. Haynes.

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Haynes, M.R., Wu, G.E. Gene discovery at the human T-cell receptor α/δ locus. Immunogenetics 59, 109–121 (2007). https://doi.org/10.1007/s00251-006-0165-7

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