Genome size of some selachian fishes

Stingo, Vincenzo; Buit, Marie-Henriette Du; Odierna, Gaëtano

doi:10.1080/11250008009440330

Cited by 24 publications

(15 citation statements)

References 19 publications

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“…Beside lungfishes and amphibians, the cartilaginous fishes display the largest genome size ranging from 1.5 pg/N in the chimaeras to 17 pg/N in sharks with an aver-age of 5.7 pg/N [Stingo et al, 1980;Gregory, 2005]. Although the lowest values are found in the chimaeras, which are considered to be the most primitive group among chondrichthyes, it is not possible to identify a clear trend in genome size evolution within this class.…”

Section: Deuterostomesmentioning

confidence: 68%

Transposons, Genome Size, and Evolutionary Insights in Animals

Canapa¹,

Barucca

Biscotti³

et al. 2015

Cytogenet Genome Res

135

124

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The relationship between genome size and the percentage of transposons in 161 animal species evidenced that variations in genome size are linked to the amplification or the contraction of transposable elements. The activity of transposable elements could represent a response to environmental stressors. Indeed, although with different trends in protostomes and deuterostomes, comprehensive changes in genome size were recorded in concomitance with particular periods of evolutionary history or adaptations to specific environments. During evolution, genome size and the presence of transposable elements have influenced structural and functional parameters of genomes and cells. Changes of these parameters have had an impact on morphological and functional characteristics of the organism on which natural selection directly acts. Therefore, the current situation represents a balance between insertion and amplification of transposons and the mechanisms responsible for their deletion or for decreasing their activity. Among the latter, methylation and the silencing action of small RNAs likely represent the most frequent mechanisms.

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Section: Deuterostomesmentioning

confidence: 68%

Transposons, Genome Size, and Evolutionary Insights in Animals

Canapa¹,

Barucca

Biscotti³

et al. 2015

Cytogenet Genome Res

135

124

View full text Add to dashboard Cite

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“…1979) . DNA amount is similar in the 2 species, 14 and 15 pg/N in T. marmorata and T. ocellata, respectively (Stingo et al, 1980) . …”

mentioning

confidence: 77%

NOR and heterochromatin analysis in two cartilaginous fishes by C-, Ag- and RE (restriction endonuclease)-banding

Stingo

Rocco²,

Odierna³

et al. 1995

Cytogenet Genome Res

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Selachian chromosomes were investigated for the first time by C-, Ag- and RE (restriction endonuclease)-band-ing. A pair of NOR-bearing acrocentric chromosomes, as well as a third extra site, were demonstrated in two species of Torpedo. In situ digestion with restriction endonucleases revealed a peculiar arrangement of constitutive heterochromatin: in Torpedo ocellata the centromere never appeared C-banded, and was always digested by AluI, PstI, DdeI and HaeIII; in Torpedo marmorata, instead, heterochromatin was present in the centromere, and was not digested by the same enzymes. The occurrence of different types of centromeric heterochromatin suggests an involvement of highly repeated DNA fractions in the Robertsonian phenomena that occurred in chromosome rearrangements in the genus Torpedo.

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“…The selachian literature reports few studies on genome size (Hinegardner, 1976; Stingo, 1979; Stingo et al. , 1980) and organization (Olmo et al.…”

Section: Discussionmentioning

confidence: 99%

(TTAGGG)n telomeric sequence in selachian chromosomes

2001

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The distribution of telomeric sequence (TTAGGG)n in the genomes of Chondrichthian species at different stages of evolution was investigated both by DNA genomic hybridization, and by fluorescence in-situ hybridization (FISH) of metaphase chromosomes. The sequence is highly conserved in all the species examined. FISH revealed a label uptake only by the telomeres in Raja asterias. However, in Torpedo ocellata, we revealed pericentromeric and interstitial sequence localization on some chromosome pairs in addition to the hybridization signal on telomeres. These findings confirm that the karyotype evolution of these fish began by Robertsonian fusion.

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Genome size of some selachian fishes

Cited by 24 publications

References 19 publications

Transposons, Genome Size, and Evolutionary Insights in Animals

Transposons, Genome Size, and Evolutionary Insights in Animals

NOR and heterochromatin analysis in two cartilaginous fishes by C-, Ag- and RE (restriction endonuclease)-banding

(TTAGGG)n telomeric sequence in selachian chromosomes

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