A new dispersed element in the genome of the catfish Hisonotus leucofrenatus (Teleostei

Ferreira, Daniela Cristina; Oliveira, Claudio; Foresti, Fausto

doi:10.4161/mge.1.2.17450

Cited by 5 publications

(4 citation statements)

References 20 publications

(24 reference statements)

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“…The distinct organization and distribution of the H3 and H4 histone sites in S. marmoratus lead to the conclusion that, in this group, these sites are organised in small and abundant repetitions throughout the genome. This extensive distribution may be attributed to one of the following factors: ( i ) extensive occurrence of orphon genes derived from in-tandem repetitive families in eukaryotes, as already demonstrated for histone and ribosomal genes (Childs et al , 1981; Eirín-López et al , 2004) and likely to be related to a birth-and-death evolutionary mechanism (Eirín-López et al , 2004); or ( ii ) associations between histone sequences and transposable elements (TEs) due to the similarity of their distribution patterns mapped in fishes (Ferreira et al , 2011a, 2011b). …”

Section: Discussionmentioning

confidence: 99%

“…Just as for histone sites, the physical mapping of TEs in representatives of the Neotropical ichthyofauna is restricted to a small number of species and to the non-LTR retrotransposons Rex1 , Rex3 and Rex6 (Gross et al , 2009; Cioffi et al , 2010; Valente et al , 2011; Ferreira et al , 2011a,b; Pansonato-Alves et al , 2013a). The overlap of signals generated by FISH among TEs and other repetitive sequences raises questions about their role in the dispersion of repetitive DNA sequences (Mandrioli et al , 2001; Mandrioli and Manicardi, 2001; Cioffi et al , 2010).…”

Section: Discussionmentioning

confidence: 99%

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Scattered organization of the histone multigene family and transposable elements in Synbranchus

et al. 2014

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The fish species Synbranchus marmoratus is widely distributed throughout the Neotropical region and exhibits a significant karyotype differentiation. However, data concerning the organization and location of the repetitive DNA sequences in the genomes of these karyomorphs are still lacking. In this study we made a physical mapping of the H3 and H4 histone multigene family and the transposable elements Rex1 and Rex3 in the genome of three known S. marmoratus karyomorphs. The results indicated that both histone sequences seem to be linked with one another and are scattered all over the chromosomes of the complement, with a little compartmentalization in one acrocentric pair, which is different from observations in other fish groups. Likewise, the transposable elements Rex1 and Rex3 were also dispersed throughout the genome as small clusters. The data also showed that the histone sites are organized in a differentiated manner in the genomes of S. marmoratus, while the transposable elements Rex1 and Rex3 do not seem to be compartmentalized in this group.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Scattered organization of the histone multigene family and transposable elements in Synbranchus

et al. 2014

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“…Using microarray analysis, Lippman et al (2004) showed that in Arabidopsis the heterochromatin is determined by transposable elements and related to tandem repeats. Transposons have been found in the heterochromatin of several fish groups, including Cichla kelberi ( Teixeira et al , 2009 ), Hisonotus leucofrenatus ( Ferreira et al , 2011 ), and Antarctic fishes of the suborder Notothenioidei ( Ozouf-Costaz et al , 2004 ). Furthermore, transposons have been associated with the karyotypic variation observed in Erythrinus erythrinus ( Cioffi et al , 2010 ), and the formation of the Y chromosome in Chionodraco roseofuscus ( Capriglione et al , 2000 ).…”

Section: Discussionmentioning

confidence: 99%

Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin

et al. 2014

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Cytogenetic studies were carried out on samples of Parapteronotus hasemani, Sternarchogiton preto and Sternarchorhamphus muelleri (Apteronotidae, Gymnotiformes) from the Amazon basin. The first two species exhibited both a 2n = 52 karyotype, but differed in their karyotypic formulae, distribution of constitutive heterochromatin, and chromosomal location of the NOR. The third species, Sternarchorhamphus muelleri, was found to have a 2n = 32 karyotype. In all three species the DAPI and chromomycin A3 staining results were consistent with the C-banding results and nucleolar organizer region (NOR) localization. The 18S rDNA probe confirmed that there was only one pair of ribosomal DNA cistron bearers per species. The telomeric probe did not reveal interstitial telomeric sequences (ITS). The karyotypic differences among these species can be used for taxonomic identification. These data will be useful in future studies of these fishes and help understanding the phylogenetic relationships and chromosomal evolution of the Apteronotidae.

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“…In D. melanogaster, the non-LTR retroelements Heta and Tart assume the function of telomeres and telomerase [49]. TEs are also involved in the formation and epigenetic regulation of heterochromatin as described in Drosophila [50,51] and several other vertebrate and invertebrate species [52][53][54][55].…”

Section: Transposable Element Domestication: An Evolutionary Gain Sommentioning

confidence: 99%

Transposable elements and human cancer: A causal relationship?

Chénais

2013

Biochimica et Biophysica Acta (BBA) - Reviews on Cancer

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Transposable elements are present in almost all genomes including that of humans. These mobile DNA sequences are capable of invading genomes and their impact on genome evolution is substantial as they contribute to the genetic diversity of organisms. The mobility of transposable elements can cause deleterious mutations, gene disruption and chromosome rearrangements that may lead to several pathologies including cancer. This mini-review aims to give a brief overview of the relationship that transposons and retrotransposons may have in the genetic cause of human cancer onset, or conversely creating protection against cancer. Finally, the cause of TE mobility may also be the cancer cell environment itself.

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A new dispersed element in the genome of the catfish Hisonotus leucofrenatus (Teleostei

Cited by 5 publications

References 20 publications

Scattered organization of the histone multigene family and transposable elements in Synbranchus

Scattered organization of the histone multigene family and transposable elements in Synbranchus

Chromosomal diversity in three species of electric fish (Apteronotidae, Gymnotiformes) from the Amazon Basin

Transposable elements and human cancer: A causal relationship?

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