Molecular Biology and Evolution, Vol 15, 1062-1068, Copyright © 1998 by Society for Molecular Biology and Evolution
N Mestrovic, M Plohl, B Mravinac and D Ugarkovic
Satellite DNA profiles have been characterized in the congeneric species
Palorus ratzeburgii, Palorus subdepressus, Palorus genalis, and Palorus
ficicola (Coleoptera, Insecta), each of which contains a single, A + T-rich
satellite DNA comprising a considerable portion of the genome (20%-40%).
These satellites exhibit insignificant mutual sequence similarity. Using
PCR assay, it has been shown that all four sequences are present in each of
the tested Palorus species: one of them is amplified into a high copy
number or a major satellite, while the three others are in the form of
low-copy-number repeats estimated to make up approximately 0.05% of the
genome. Each of the four satellites is interspecifically high conserved
concerning the sequence, monomer length, and tandem repeat organization.
Major, as well as low- copy-number, satellites are colocalized in the
regions of pericentromeric heterochromatin on all chromosomes of the
complement. The low-copy-number satellites are dispersed between the large
arrays of the major satellite over the whole heterochromatic block. Our
results explain satellite DNA evolution, confirming the hypothesis that
related species share a "library" of conserved satellite sequences, some of
which could be amplified into a major satellite. Due to the evolutionary
dynamics of satellite DNAs, the content of the "library" is variable; the
elimination of some sequences parallels the creation of the new ones.
Quantitative changes in satellite DNAs, induced by occasional amplification
of satellite repeat from the "library", could possibly occur in the course
of the speciation process, thus forming a species-specific profile of
satellite DNAs.
ORIGINAL ARTICLE
Evolution of satellite DNAs from the genus Palorus--experimental evidence for the "library" hypothesis
Department of Molecular Genetics, Ruder Boskovic Institute, Zagreb, Croatia.
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