cDNA Sequence Diversity and Genomic Clusters of Major Surface Glycoprotein Genes of Pneumocystis carinii
1993
The major surface glycoprotein (MSG) of Pneumocystis carinii plays a crucial role in the pathobiology of P. carinii, which often causes fatal pneumonia in AIDS patients. The cDNAs encoding MSG antigens were cloned from a λgt11 expression library of rat-derived P. carinii by immunoscreening. The cloned cDNAs constituted a gene family containing ∼70% amino acid identity between subtypes. The diversity of MSG cDNAs was high and reflected the genomic structure of MSG genes clustered in the P. carinii chromosomes. These multiple genes may account for the high-level expression of MSG that could generate potential variations in the cell surface
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