We have isolated and deduced the structure of the βFcγRII gene from the mouse. This gene spans approximately 18 kb of DNA; the structure and nucleotide sequence has been determined and potential regulatory sites identified. This gene is composed of 10 exons that give rise to the β1 and β2 FcγRII cDNA. Four exons encode the 5' untranslated region and leader sequence, one exon for each Ig-binding domain and membrane-spanning region and three exons encoding the cytoplasmic tail and 3' untranslated region. Analysis of the gene structure indicated that the β1FcγRII and β2FcγRII arise by differential mRNA splicing when a single 141-bp exon (exon 8) is alternately spliced to give rise to these isoforms. Sequence analysis of 2 kbp upstream of the transcription start site indicated the presence of regulatory elements, including three binding sites for the transcription factor Sp1, and Ap-4 binding site, a tandem glucocorticoid response element, and an overlapping tandem repeat. Furthermore, as in the Thy-1 gene, no CAT or TATA consensus sequences were observed. In addition, sites of methylation that regulate expression of this gene were also located at the 5' end of the gene and within several introns. A large intron located between exons 4 and 5 also contained a series of purine/pyrimidine-rich regions and a potential enhancer sequence.
|Number of pages||8|
|Journal||Journal of Immunology|
|Publication status||Published - 1 Jan 1991|