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• W2053792020 abstract "A new highly abundant satellite DNA from <i>Discoglossus pictus (Dp-sat1)</i> was isolated and characterized. The repetitive unit (0.51 kb) has 2 <i>Hin</i>dIII sites and only one <i>Spe</i>I site: digestion of genomic DNA with <i>Hin</i>dIII produces 3 fragments: HA (0.17 kb), HB (0.34 kb), and HC = HA + HB (0.51 kb), while digestion with <i>Spe</i>I produces the whole repetitive unit (0.51 kb) that contains both <i>Hin</i>dIII sites. Sequence analysis of cloned repeats indicates an average A + T content of 71%, with many A- and T-runs. Southern blot analysis shows an arrangement of multiple bands of the 0.51 kb monomer in <i>Spe</i>I-digested DNA, while <i>Hin</i>dIII-digested DNA shows a ladder composed of all the possible combinations of the 3 digested fragments. Quantitative dot-blot indicates that <i>Dp-sat1</i> accounts for about 6% of the <i>D. pictus</i> genome: this value represents about 1.5 × 10⁶ copies of repetitive units per nucleus. This satellite DNA is also a major repetitive DNA in 4 other <i>Discoglossus</i> species, in which the repetitive unit presents the same size and restriction sites except in <i>D. montalentii</i> where it contains a unique <i>Hin</i>dIII site. This satellite DNA was absent in all the other tested archaeo- and neo-bratrachian species, as well as non-amphibian species. Fluorescent in situ hybridization (FISH) analysis shows that <i>Dp-sat1</i> is localized only in peri- and/or para-centromeric areas of the 7 small chromosome pairs, while no labeling was observed in the 7 large chromosome pairs. Remarkably, <i>Dp-sat1</i> heterochromatin is found only at one pole of the nucleus, suggesting that during interphase all 7 small chromosome pairs are located in the same nuclear region." @default.
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• W2053792020 date "2009-01-01" @default.
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• W2053792020 title "Unusual Chromosomal Distribution of a Major Satellite DNA from <i>Discoglossus pictus </i>(Amphibia, Anura)" @default.
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• W2053792020 doi "https://doi.org/10.1159/000279444" @default.
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