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Divergence of repetitive DNA sequences in Echinodermata. I. Comparison of sequences with a high degree of intragenomic divergence

Poltaraus, A.B.; Antonov, A.S.; Petrov, N.B.

Molekuliarnaia Biologiia 14(3): 661-674

1980

ISSN/ISBN: 0026-8984
PMID: 7402207
Document Number: 164987
Molecular DNA-DNA hybridization was used for comparison of repetitive sequences with a high degree of intragenomic divergence in 7 spp. in 3 classes of Echinodermata [Strongylocentrotus intermedius, S. droebachiensis, S. nudus, Scaphechinus mirabilis, Echinocardium cordatum, Patiria pectinifera and Cucumaria japonica], and for a representative of the annelids [Nereis virens]. The value of intragenomic divergence was estimated with respect to a thermolabile fraction of repetitive [3H]DNA of S. intermedius; this was isolated by thermoelution at 70.degree. after reassociation up to COt [CO=initial concentration of DNA; t=hybridization time] = 140. The given fraction was significantly conserved as its nomologes are present in DNA of all the species studied. Hybridization of the thermolabile fraction of [3H]DNA S. intermedius at COt=10 and 1000 allowed estimation of the divergence of sequences in DNA of all the species studied. Hybridization of the thermolabile fraction of [3H]DNA highly repetitive sequences of the given DNA fraction is more appreciable than that of moderately repetitive ones. Intragenomic divergence of moderately repetitive thermolabile sequences is higher than that of highly repetitive sequences, both in phylogenetically close and distant species of sea urchins.

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