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Eur J Immunol 1996 Apr 01;264:780-91.
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CTX, a novel molecule specifically expressed on the surface of cortical thymocytes in Xenopus.

Chrétien I , Robert J , Marcuz A , Garcia-Sanz JA , Courtet M , Du Pasquier L .

CTX, a novel developmentally regulated type-I transmembrane protein is expressed specifically by a large fraction of cortical thymocytes in the amphibian Xenopus. This apparently monomeric 55-kDa glycoprotein is composed of two immunoglobulin domains, one variable (V) and one constant (C2 type), followed by a transmembrane and a 64-amino acid cytoplasmic domain. The first immunoglobulin domain is a V-J segment that is generated without gene rearrangement. In the genome, the V and C2 domains are both encoded by two half-domain exons. Two CTX loci are found per haploid genome, and they exhibit sequence differences with a high replacing/silent ratio in the CDR1-like region of the V domain, suggesting that these differences were selected. The cytoplasmic domain contains a motif that is highly conserved evolutionarily in several types of proteins, including adenylyl cyclases. Based on its unique tissue distribution, the variability of its V region and the motif of its cytoplasmic domain, CTX is a candidate for a new type of specific molecule involved in thymocyte selection.

PubMed ID: 8625968
Article link: Eur J Immunol

Species referenced: Xenopus laevis
Genes referenced: vsig1
Antibodies: Cth Ab1 Cth Ab2