Differential homogenization and amplification of two satellite DNAs in the genus Cucurbita (Cucurbitaceae)

King, Klaus; Jobst, Jürgen; Hemleben, Vera

doi:10.1007/bf00173181

Cited by 42 publications

(35 citation statements)

References 36 publications

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“…through ectopic gene conversion). Indeed centromeric repeat families are a classic example of this phenomenon (Alexandrov et al, 1988;King et al, 1995;Galian and Vogler, 2003;Hall et al, 2005), and the similarity of repeats within the CentH-1 and CentH-2 classes, two centromere satellites of allopolyploid Arabidopsis suecica, indicates that these repeats can interact across nonhomologous chromosomes.…”

Section: Discussionmentioning

confidence: 99%

Molecular and Chromosomal Evidence for Allopolyploidy in Soybean

et al. 2009

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Recent studies have documented that the soybean (Glycine max) genome has undergone two rounds of large-scale genome and/or segmental duplication. To shed light on the timing and nature of these duplication events, we characterized and analyzed two subfamilies of high-copy centromeric satellite repeats, CentGm-1 and CentGm-2, using a combination of computational and molecular cytogenetic approaches. These two subfamilies of satellite repeats mark distinct subsets of soybean centromeres and, in at least one case, a pair of homologs, suggesting their origins from an allopolyploid event. The satellite monomers of each subfamily are arranged in large tandem arrays, and intermingled monomers of the two subfamilies were not detected by fluorescence in situ hybridization on extended DNA fibers nor at the sequence level. This indicates that there has been little recombination and homogenization of satellite DNA between these two sets of centromeres. These satellite repeats are also present in Glycine soja, the proposed wild progenitor of soybean, but could not be detected in any other relatives of soybean examined in this study, suggesting the rapid divergence of the centromeric satellite DNA within the Glycine genus. Together, these observations provide direct evidence, at molecular and chromosomal levels, in support of the hypothesis that the soybean genome has experienced a recent allopolyploidization event.

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Section: Discussionmentioning

confidence: 99%

Molecular and Chromosomal Evidence for Allopolyploidy in Soybean

et al. 2009

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“…Recent data on satellite DNAs from different plant genera also confirm the spreading of a particular satellite sequence over the most of congeneric species (Pich, Fritsch, and Schubert 1996). However, due to the high interspecific variability in the copy number, the presence of the satellite can sometimes be proved only by a sensitive PCR method (King, Jobst, and Hemleben 1995). Such distribution of a satellite DNA among taxonomicaly related species and the absence of data showing the occurrence of the same satellite DNA in phylogeneticaly unrelated groups makes the possibility of horizontal transfer of satellite repeats between species highly improbable.…”

Section: Discussionmentioning

confidence: 99%

Evolution of satellite DNAs from the genus Palorus--experimental evidence for the "library" hypothesis

Meštrović¹,

Plohl²,

Mravinac³

et al. 1998

Molecular Biology and Evolution

139

100

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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, AϩT-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 highly 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.

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“…As a consequence of the nature of evolution of repetitive sequences, acquisition and loss of restriction sites and amplification of specific repeat clusters may happen during the evolution of phyletic lineages. Thus, similar patterns are common in closely related species and may be different between lineages (Kamm et al 1995, King et al 1995, Cardone et al 1997, Hall et al 2005, suggesting potential pattern of relationships among taxa. Several species that represent closely related taxa, accordingly to available molecular and morphological phylogenetic reconstructions, effectively show similar organization and representation of dispersed repeated elements.…”

Section: Discussionmentioning

confidence: 86%

“…At the same time, the study of the physical organization of repetitive DNA sequences and of the degree of conservation and/or divergence of these sequences among related species may represent a way to gain knowledge of the evolution of and within a species group (Bedbrook et al 1980, Bachmann and Sperlich 1993, Capriglione et al 1998. In fact, repetitive DNA not only represents a dynamic and fast evolving component of the eukaryotic genome, but may also show conservation within taxonomic groups, thus providing evidence for phylo-genetic relationships (King et al 1995, Pich et al 1996, Alix et al 1998,plants consisting of three families (Johnson 1959, Norstog and Nicholls 1997, Stevenson 1990), 11 genera and over 150 species (Stevenson 1992). The genus Zamia (Zamiaceae) has the widest ecological and morphological diversity among all cycad genera, ranging from arborescent species to species with small, subterranean stems, to epiphytic taxa (Stevenson et al 1995, Norstog andNicholls 1997).…”

Section: Introductionmentioning

confidence: 99%

Organization of a dispersed repeated DNA element in the Zamia genome

Cafasso¹,

Cozzolino²,

Vereecken³

et al. 2009

Biologia plant.

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Occurrence and genomic organization of dispersed elements containing ZpS1 satellite repeats have been investigated in a wide representation of species of the old plant genus Zamia (Zamiaceae, Cycadales). In Z. paucijuga, the ZpS1 repeat is organized as long satellite DNA arrays and as short arrays inserted into AT-rich dispersed elements. A comparative study by Southern analysis shows that these unusual dispersed elements containing the ZpS1 repeat are present with different organizations in all investigated Zamia species. In some species these elements are present with a low copy number, while in other species secondary amplification events, involving specific sequence clusters, appear to have generated characteristic dispersed elements in a high copy number. Among Zamia species, several groups share similar restriction patterns, as the Zamia loddigesii complex and the Caribbean species suggesting a general correlation between organization and genomic representation of the dispersed repeated sequence and the pattern of phyletic relationships in the genus. However, the finding of different patterns also among closely related species suggests a complex history of amplifications and losses of these dispersed repetitive elements that cannot be always easily traced through the phylogenetic reconstruction of this ancient plant group.

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Differential homogenization and amplification of two satellite DNAs in the genus Cucurbita (Cucurbitaceae)

Cited by 42 publications

References 36 publications

Molecular and Chromosomal Evidence for Allopolyploidy in Soybean

Molecular and Chromosomal Evidence for Allopolyploidy in Soybean

Evolution of satellite DNAs from the genus Palorus--experimental evidence for the "library" hypothesis

Organization of a dispersed repeated DNA element in the Zamia genome

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