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. 1993 Feb;31(2):244-8.
doi: 10.1128/jcm.31.2.244-248.1993.

Molecular characterization of a novel repetitive element from Pneumocystis carinii from rats

J Zhang  1 , M T Cushion, J R Stringer
Affiliations

Molecular characterization of a novel repetitive element from Pneumocystis carinii from rats

J Zhang et al. J Clin Microbiol. 1993 Feb.

Abstract

A repetitive DNA sequence, Rp-alpha, was isolated from rat-derived Pneumocystis carinii. The genome of rat-derived P. carinii contained 10 to 15 copies of Rp-alpha, which were located on most chromosomes, but no Rp-alpha could be detected in P. carinii derived from either humans or mice. Sequence analysis of two copies of the repeat showed them to be related but distinct. Each of them contained several copies of the 9-base sequence TAACCCTAA, arranged as direct repeats. Oligonucleotides consisting of multimers of this 9mer hybridized to the same set of chromosomes recognized by cloned copies of the Rp-alpha repeat. When used in DNA fingerprinting, the Rp-alpha repeat was capable of distinguishing between different isolates of rat-derived P. carinii.

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