Open AccessVariation andin vitrosplicing of group I introns in rRNA genes ofPneumocystis carinii
Author(s) -
Yong Liu,
Michael J. Leibowitz
Publication year - 1993
Publication title -
nucleic acids research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 9.008
H-Index - 537
eISSN - 1362-4954
pISSN - 0305-1048
DOI - 10.1093/nar/21.10.2415
Subject(s) - intron , biology , pneumocystis carinii , gene , group i catalytic intron , rna splicing , genetics , group ii intron , ribosomal rna , rna , virology , human immunodeficiency virus (hiv) , pneumocystis jirovecii
The sequences of the rRNA genes of Pneumocystis carinii from rat and human sources demonstrate three distinct genotypes based on the group I introns present in these genes. One rat isolate (Pc1) contains such introns in its 16S and 26S rRNA genes, while another rat isolate (Pc2) and a human isolate (Pc3) only contain an intron in the 26S rRNA gene. The four introns all catalyze their own excision from RNA transcripts, and this reaction is inhibited by the anti-pneumocystis drug pentamidine and its analogues. Although they differ in sequence, they are more similar to one another than to group I introns found in other eukaryotic microbes.