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M9480879.TXT
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1994-09-05
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Document 0879
DOCN M9480879
TI Sequence variations in the internal transcribed spacers of the ribosomal
RNA genes of Pneumocystis carinii strains that infect humans.
DT 9410
AU Lu J; Lee C; Bartlett M; Smith J; Indiana Univ. Sch. of Med.,
Indianapolis.
SO Abstr Gen Meet Am Soc Microbiol. 1994;94:141 (abstract no. D-255).
Unique Identifier : AIDSLINE ASM94/94313066
AB Pneumocystis carinii is a major cause of life-threatening pneumonia in
immunocompromised patients. It is unknown at present whether the P.
carinii infecting humans represents a single type of organism or a group
of organisms. To answer this question, we have examined the nucleotide
sequences of the internal transcribed spacers ITS1 and ITS2 of the
ribosomal RNA genes of P. carinii in bronchoalveolar lavage specimens
from 10 different patients. Oligonucleotide primers were designed to
amplify the ITS1 and ITS2 regions separately or together by polymerase
chain reaction and the nucleotide sequences of the amplified fragments
were determined. Analysis of the nucleotide sequences revealed that
sequence variations exist in both the ITS1 and ITS2 regions of P.
carinii. We found 4 types of ITS1 (designated A, B, C, and D) and 4
types of ITS2 (designated a, b, c, d) sequences. Based on this
information, we classified the P. carinii strains from the 10 patients
into 5 types: Ab, Bd, Ca, Cb and Db. We also found that two patients
were infected by two different types of P. carinii concurrently. The
results of this study suggest that sequence variation in the ITS regions
of rRNA genes of P. carinii can be used to subtype human P. carinii
strains and that coinfection with more than one strain of P. carinii in
the same patient is possible.
DE Base Sequence Comparative Study DNA, Ribosomal/CHEMISTRY/*GENETICS
*Genes, Fungal Human Pneumocystis
carinii/CLASSIFICATION/*GENETICS/ISOLATION & PURIF Pneumonia,
Pneumocystis carinii/*MICROBIOLOGY RNA, Ribosomal/GENETICS
Transcription, Genetic *Variation (Genetics) MEETING ABSTRACT
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).