Genomic organization and chromosomal localization of the human CD27 gene.

CD27 is a lymphocyte-specific member of a recently identified receptor family with at least 10 members that includes the receptors for nerve growth factor and TNF, CD40, and Fas. Several members of this family play a role in cell differentiation, proliferation, and survival. Within the amino terminal ligand binding domain of these receptors, repeat motifs have been identified. These repeats contain many cysteine residues in a conserved pattern, characteristic of this family. We have isolated and characterized the human CD27 gene to gain insight into the evolution of this type of receptor domain. The gene was localized on chromosome 12, band 12p13. Sequence analysis showed no correlation between the intron/exon organization and the subdivision of the protein into distinct domains. Structural information for the cysteine-rich domain is contained within three exons. In addition, the splice sites in the CD27 gene are located in a different position from those in the related nerve growth factor receptor gene. However, a comparison of the splice sites within the regions encoding the respective ligand-binding domains of the CD27 and nerve growth factor receptor genes identifies the archetypal cysteine-rich building blocks, from which the members of this family may have arisen during the course of evolution. From this observation, we propose a new organization of the repeat motifs.

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