Intra- and interspecific genome-size variation in the Salmonidae

Lockwood, Samuel; Derr, James N.

doi:10.1159/000133275

Cited by 21 publications

(7 citation statements)

References 9 publications

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“…As far as the size of intraspecific DNA variation is concerned, the 21.13% amount that we observed in conspecific stick insects is higher than the intraspecific values of 13% reported for cyprinids (Gold and Price 1985) or the 15.5% reported for salmonids (Lockwood and Derr 1992). However, intraspecific variation as high as 31.9% has been observed in Trachemys turtle species (Lockwood et al 1991) Figs.…”

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confidence: 64%

“…Although it is a common belief that the nuclear DNA content is constant within a species or that any variation would be negligible (Hinegardner 1968;Olmo 1983;CavalierSmith 1985), several recent papers have claimed the existence and pointed to the importance of intraspecific variations in both plants (Price at al. 1980;Laurie and Bennet 1985) and animals (Rao and Rai 1987;Gold and Amemiya 1987;Ferrari and Rai 1989;Ragland and Gold 1989;Alvarez-Fuster et al 1991;Lockwood et al 1991;Lockwood and Derr 1992;Ruedas et al 1993), that are presumably caused by gains or losses in various classes of DNA, including satellite DNA.…”

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Flow-cytometric analyses of intraspecific genome size variations in Bacillus atticus (Insecta, Phasmatodea)

Marescalchi¹,

Scali²,

Zuccotti³

1998

Genome

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The stick insect Bacillus atticus comprises several populations with different chromosome numbers that are distributed over a large range of the Mediterranean basin. Here we have analyzed the DNA content of nine diploid and three triploid populations by flow-cytometry. The mean genome size of the diploids showed a significant decrease from east to west, ranging from 5.29 ± 0.12 pg for the population from Crete (east) to 4.28 ± 0.10 pg for the population from Sardinia (far west). This longitudinal trend of a decrease in genome size from east to west was also found for the triploid populations (from 6.80 pg for the population in Turkey to 6.08 ± 0.01 pg for the population on the Isle of Rhodes). Differences in DNA content between populations belonging to the same species have been described in animals, but the evolutionary implications of these differences are as yet unclear. What emerges from the present study is a correlation between genome-size variations and geographic distribution. The adaptive nature of genome-size variations in response to environmental changes is discussed, and the class of DNA involved hypothesized.Résumé : Le phasme Bacillus atticus comprend plusieurs populations qui montrent un nombre chromosomique variable et qui sont distribuées sur la plupart du bassin méditerranéen. Dans la présente étude, les auteurs ont analysé le contenu en ADN de neuf populations diploïdes et de trois populations triploïdes par cytométrie en flux. La taille moyenne du génome chez les diploïdes diminuait d'est en ouest, allant de 5,29 ± 0,12 pg chez la population de Crète (est) à 4,8 ± 0,10 pg chez la plus occidentale (Sardaigne). Cette tendance longitudinale de diminution de la taille du génome d'est en ouest a aussi été observée chez les populations triploïdes (de 6,80 pg en Turquie jusque 6,08 ± 0,01 pg sur l'Île de Rhodes). Des différences intraspécifiques quant au contenu en ADN ont été décrites chez les animaux mais leurs implications évolutives demeurent nébuleuses. Il ressort de cette étude une corrélation entre les variations de la taille du génome et la distribution géographique. La plasticité adaptative que confèrent des variations du contenu en ADN face à des changements environnementaux ainsi que la classe d'ADN qui est vraisemblablement impliquée sont discutées.Mots clés : valeur C, cytométrie en flux, tendances quant à la taille du génome, variation intraspécifique du contenu en ADN, classes d'ADN.

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confidence: 99%

Flow-cytometric analyses of intraspecific genome size variations in Bacillus atticus (Insecta, Phasmatodea)

Marescalchi¹,

Scali²,

Zuccotti³

1998

Genome

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“…Intraspecific differences in DNA cell content have been reported (5, 29, 40, 41) for the fish species analyzed in this study. In spite of this, we found few differences for the individuals studied for each of the three species (minimum of 10 and maximum of 21).…”

Section: Discussionmentioning

confidence: 65%

Flow cytometry measurement of the DNA contents of G0/G1 diploid cells from three different teleost fish species

et al. 2002

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Background:Although there is a lot information in the literature about genome size in fish, a high variability among data for the same species is reported, being mainly related to methodological aspects. Flow cytometry-based fluorescence measurements of intercalating dyes is the most attractive approach due to its precision, objectivity, high speed, and relative simplicity. Methods: We analyze the DNA content of G0/G1 diploid nuclei of three teleost species (Carassius auratus, Tinca tinca, and Danio rerio) using flow cytometry. Forty-three animals were used and up to 50,000 retinal cells were analyzed per sample. Propidium iodide-associated fluorescence was assessed using a FACSCalibur flow cytometer. Standard human leukocytes were used as a reference.

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“…However, the few studies which have been done at the population lev- (Sherwod and Patton 1982), fishes (Gold and Amemiya 1987;Gold, Ragland, and Schliesling 1990;Lockwood and Derr 1990), and insects, such as mosquitoes (Rao and Rai 1987;Black and Rai 1988;Warren and Crampton 1991) and Drosophila (Dawley 1997, pp. 143-184).…”

Section: Introductionmentioning

confidence: 99%

Evolution of Genome Size in Drosophila. Is the Invader's Genome Being Invaded by Transposable Elements?

Vieira¹,

Nardon²,

Arpin³

et al. 2002

Molecular Biology and Evolution

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Genome size varies considerably between species, and transposable elements (TEs) are known to play an important role in this variability. However, it is far from clear whether TEs are involved in genome size differences between populations within a given species. We show here that in Drosophila melanogaster and Drosophila simulans the size of the genome varies among populations and is correlated with the TE copy number on the chromosome arms. The TEs embedded within the heterochromatin do not seem to be involved directly in this phenomenon, although they may contribute to differences in genome size. Furthermore, genome size and TE content variations parallel the worldwide colonization of D. melanogaster species. No such relationship exists for the more recently dispersed D. simulans species, which indicates that a quantitative increase in the TEs in local populations and fly migration are sufficient to account for the increase in genome size, with no need for an adaptation hypothesis.

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Intra- and interspecific genome-size variation in the Salmonidae

Cited by 21 publications

References 9 publications

Flow-cytometric analyses of intraspecific genome size variations in Bacillus atticus (Insecta, Phasmatodea)

Flow-cytometric analyses of intraspecific genome size variations in Bacillus atticus (Insecta, Phasmatodea)

Flow cytometry measurement of the DNA contents of G0/G1 diploid cells from three different teleost fish species

Evolution of Genome Size in Drosophila. Is the Invader's Genome Being Invaded by Transposable Elements?

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