ISSN:
1617-4623
Keywords:
Entamoeba histolytica
;
Non-reciprocal recombination
;
Genomic plasticity
;
Variability
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract A highly variable DNA region (EhVRI), isolated from Entamoeba histolytica clone A, strain HM1:IMSS, is transcribed into several transcripts, which differ in genetically related clones. EhVRI (3.5 kb) is composed of two contiguous fragments; one of these 1.9 kb long, at the 3′ end, identified similar transcripts in clones A, L6 and C2 (all derived from strain HM 1: IMMS), the other of 1.6 kb, at the 5′ end, detected 0.5, 0.6 and 0.7 kb transcripts only in clone A. Variability of the 1.6 kb fragment was found even within the same clone maintained under different conditions. EhVRl was localized to 1.3 and 1.4 Mb linear chromosomes and also found in circular molecules. The sequence of the 1.6 kb fragment revealed the presence of a large number of different repeats, including inverted and palindromic repeats. A p145 sequence, previously detected in episomal DNA of the amoeba, was found at the 5′ end of EhVR1. The presence of EhVRI in linear and circular molecules, its high number of repeats, and its variability in genetically related clones suggest the existence of DNA regions that undergo dynamic non-reciprocal recombination between circular episomes and linear chromosomes, and may thus contribute to variability in the trophozoite genome.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00284678
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