Abstract
The mini-exon gene repeats from two isolates of Trypanosoma (Nannomonas) simiae were amplified by polymerase chain reaction (PCR). The products from each isolate differed in size, however they cross-hybridised in Southern blots. The nature of the size variation was revealed by comparison of the DNA sequence of each repeat: relative to the BAN7 strain, the mini-exon gene of KETRI 2431 contained three apparent deletions that were flanked by short (≥6-bp) direct repeats. Furthermore, one of the cloned repeats was used as a hybridisation probe against DNA from other closely-related African trypanosomes. The lack of hybridisation of the T. (N.) simiae mini-exon gene to genomic DNA from the Forest, Kilifi and Savannah subgroups of T. (N.) congolense and T. (N.) godfreyi indicate that this PCR-hybridisation assay may be useful for distinguishing T. (N.) simiae from other members of the subgenus Nannomonas.
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