The evolutionary history of sea barley (Hordeum marinum) revealed by comparative physical mapping of repetitive DNA

Carmona, Alejandro; Friero, E.; Bustos, Alfredo de; Jouve, N.; Cuadrado, Ángeles

doi:10.1093/aob/mct245

Cited by 21 publications

(28 citation statements)

References 44 publications

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“…The subtelomeric pSc119.2 satellite DNA tended to spread towards new interstitial sites during the diversification of the most primitive form of the genus Secale towards the most advanced taxa [Cuadrado and Jouve, 2002]. This highly repetitive sequence has supported events of interstitialization also in Hordeum [Carmona et al, 2013b]. Differences in the rates of sequence change were found between interstitial, slower and subtelomeric repeats .…”

Section: Chromosome-specific and Interstitial Satellite Dnasmentioning

confidence: 89%

Satellite DNA in Plants: More than Just Rubbish

Garrido-Ramos

2015

Cytogenet Genome Res

151

149

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For decades, satellite DNAs have been the hidden part of genomes. Initially considered as junk DNA, there is currently an increasing appreciation of the functional significance of satellite DNA repeats and of their sequences. Satellite DNA families accumulate in the heterochromatin in different parts of the eukaryotic chromosomes, mainly in pericentromeric and subtelomeric regions, but they also span the functional centromere. Tandem repeat sequences may spread from subtelomeric to interstitial loci, leading to the formation of chromosome-specific loci or to the accumulation in equilocal sites in different chromosomes. They also appear as the main components of the heterochromatin in the sex-specific region of sex chromosomes. Satellite DNA, required for chromosome organization, also plays a role in pairing and segregation. Some satellite repeats are transcribed and can participate in the formation and maintenance of heterochromatin structure and in the modulation of gene expression. In addition to the identification of the different satellite DNA families, their characteristics and location, we are interested in determining their impact on the genomes, by identifying the mechanisms leading to their appearance and amplification as well as in understanding how they change over time, the factors affecting these changes, and the influence exerted by the evolutionary history of the organisms. On the other hand, satellite DNA sequences are rapidly evolving sequences that may cause reproductive barriers between organisms and promote speciation. The accumulation of experimental data collected in recent years and the emergence of new approaches based on next-generation sequencing and high-throughput genome analysis are opening new perspectives that are changing our understanding of satellite DNA. This review examines recent data to provide a timely update on the overall information gathered about this part of the genome, focusing on the advances in the knowledge of its origin, its evolution, and its potential functional roles.

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Section: Chromosome-specific and Interstitial Satellite Dnasmentioning

confidence: 89%

Satellite DNA in Plants: More than Just Rubbish

Garrido-Ramos

2015

Cytogenet Genome Res

151

149

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“…Additional differences between Hordeum bogdanii and Hordeum vulgare can be seen in the distribution patterns of AAT, GCC, CAG, 45S rDNA, 5S rDNA and pSc119.2. Physical mapping of a few sequences in Hordeum marinum (Xa genome) showed that AAC and AAG produced intense and rich patterns of multiple SSR signals that were particularly concentrated in the pericentromeric region and that ACT and CAT were weakly distributed (Carmona et al 2013b). The pSc119.2 repeat produced sub-telomeric signals on nearly all chromosomes in Hordeum marinum (Taketa et al 2000); however, fewer of these signals were present in Hordeum bogdanii .…”

Section: Discussionmentioning

confidence: 99%

“…The pSc119.2 repeat produced sub-telomeric signals on nearly all chromosomes in Hordeum marinum (Taketa et al 2000); however, fewer of these signals were present in Hordeum bogdanii . Karyotype analysis of diploid Hordeum murinum (Xu) showed that AG produced intense signals around the centromere in four chromosome pairs and that AAG produced more rich and intense signals than AAC, ACT, and CAT in pericentromeric regions (Cuadrado et al 2013, Carmona et al 2013b). In addition, no pSc119.2 hybridization signals were detected in diploid Hordeum murinum (Taketa et al 2000).…”

Section: Discussionmentioning

confidence: 99%

“…AAG exhibits the most chromosomal variation both within and between taxa (Pedersen et al 1996, Pedersen and Langridge 1997, Cuadrado et al 2008, Carmona et al 2013a). AAG has been suggested to be more predisposed to being amplified or deleted relative to other repetitive sequences as a consequence of independent events in different lineages (Carmona et al 2013b). The fact that AAG is evenly colocalized with AGG in the I genome suggests that the same evolutionary mechanism also drives variation in the chromosomal distribution of AAC, ACT, and CAT.…”

Section: Discussionmentioning

confidence: 99%

“…Karyotypes of the species of the Hordeum marinum complex were determined using several tandem repeats. The results revealed the genome structure of different Hordeum marinum taxa and demonstrated the allopolyploid origin of tetraploid forms of Hordeum gussoneanum Parlatore, 1845 (Carmona et al 2013b). In addition, the genomic constitution of Hordeum murinum was characterized using multiple repetitive sequences.…”

Section: Introductionmentioning

confidence: 93%

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Chromosomal organization of repetitive DNAs in Hordeum bogdanii and H. brevisubulatum (Poaceae)

Dou¹,

Liu²,

Yu³

2016

CCG

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Molecular karyotypes of Hordeum bogdanii Wilensky, 1918 (2n = 14), and Hordeum brevisubulatum Link, 1844 ssp. brevisubulatum (2n = 28), were characterized by physical mapping of several repetitive sequences. A total of 18 repeats, including all possible di- or trinucleotide SSR (simple sequence repeat) motifs and satellite DNAs, such as pAs1, 5S rDNA, 45S rDNA, and pSc119.2, were used as probes for fluorescence in situ hybridization on root-tip metaphase chromosomes. Except for the SSR motifs AG, AT and GC, all the repeats we examined produced detectable hybridization signals on chromosomes of both species. A detailed molecular karyotype of the I genome of Hordeum bogdanii is described for the first time, and each repetitive sequence is physically mapped. A high degree of chromosome variation, including aneuploidy and structural changes, was observed in Hordeum brevisubulatum. Although the distribution of repeats in the chromosomes of Hordeum brevisubulatum is different from that of Hordeum bogdanii, similar patterns between the two species imply that the autopolyploid origin of Hordeum brevisubulatum is from a Hordeum species with an I genome. A comparison of the I genome and the other Hordeum genomes, H, Xa and Xu, shows that colocalization of motifs AAC, ACT and CAT and colocalization of motifs AAG and AGG are characteristic of the I genome. In addition, we discuss the evolutionary significance of repeats in the genome during genome differentiation.

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The Genomics of Plant Satellite DNA

Garrido-Ramos

2021

Progress in Molecular and Subcellular Biology

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The evolutionary history of sea barley (Hordeum marinum) revealed by comparative physical mapping of repetitive DNA

Cited by 21 publications

References 44 publications

Satellite DNA in Plants: More than Just Rubbish

Satellite DNA in Plants: More than Just Rubbish

Chromosomal organization of repetitive DNAs in Hordeum bogdanii and H. brevisubulatum (Poaceae)

The Genomics of Plant Satellite DNA

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