This latter hypothesis is supported by the fact that in the TCRGV phylogenetic tree the clustering of orthologue TCRGV groups from different species is evident. However, orthology between multiple TCRGC genes is maintained in more closely related
Cetartiodactyla lineages. Within this clade, dromedary TCRGC genes group apart from the other suborders, for which a common ancestor gene can be hypothesized. The TCRGV genes of mammalian and avian species cluster in two main groups that can be further subdivided in distinct subgroups labeled A to H [20, 21]. Dromedary TCRGV1 gene belongs to the mammalian subgroup F (including primates, rodents, lagomorpha, and artiodactyls), and it is most closely related to some ovine and swine TCRGV. Dromedary TCRGV2 gene instead belongs to mammalian Lapatinib subgroup H (including carnivores and artiodactyls). Our results also show that dromedary TCRG locus lacks orthologues of the mammalian subgroups A, B, and D, containing ovine and swine gene belonging to ancient cassettes TCRG5 and TCRG1, respectively. Altogether the phylogenetic results for TCRGV and TCRGC genes are in line with the most recent super trees describing the phylogeny Gefitinib in vivo of present-day mammals, in which Camelids are placed in the basal position within Cetartiodactyla [22]. Based on TCRGC sequences, two different
primers were designed and used in a second 5′ RACE experiment to enlarge the variable domain (V-GAMMA) repertoire in spleen (Supporting Information Table 1). Analysis of the sequences shows that Urease only two TCRGJ and two TCRGV genes are expressed in unique combinations: TCRGV1-TCRGJ1-1-TCRGC1 (only 5% of the in-frame clones) and TCRGV2-TCRGJ2-2-TCRGC2. The predominance of one rearrangement might indicate a probable bias in the expression of a single cassette, or alternatively, the expansion of particular clones of circulating γδ T cells. To obtain a larger cDNAs pool representative of the TCRGV1-TCRGJ1-1-TCRGC1 rearrangement, an RT-PCR experiment was conducted on the same Poly-C tailed ssDNA (Supporting Information Table 1). Different CDR3 sequences of the cDNA clones are shown in Figure 3. The CDR3 region is formed by the joining of TCRGV and
TCRGJ genes and by the nucleotide deletion and addition mechanisms typical of the junctional process. Its length varies between 5 and 17 aa (a very similar range of variation has been previously reported in mice and humans). The nucleotide additions detected, whose number varies between 0 and 16, could theoretically produce a diversity of nearly 108 sequences. However, this would probably be a significant overestimate of the actual diversity of the rearranged TCRGV2-TCRGJ2-2 cDNA, since according to our data the addition of G nucleotides (41.7%) is twice more frequent than the addition of A, T, and C nucleotides (19.4% each). Remarkably, when the cDNAs were compared with the parent genomic sequences base changes were observed at many positions especially in the variable domain.
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