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How fast is the sessile ciona?

Berná L, Alvarez-Valin F, D'Onofrio G - Comp. Funct. Genomics (2009)

Bottom Line: Genomewide analyses of distances between orthologous gene pairs from the ascidian species Ciona intestinalis and Ciona savignyi were compared with those of vertebrates.Combining this data with a detailed and careful use of vertebrate fossil records, we estimated the time of divergence between the two ascidians nearly 180 My.This estimation was obtained after correcting for the different substitution rates found comparing several groups of chordates; indeed we determine here that on average Ciona species evolve 50% faster than vertebrates.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Animal Physiology and Evolution, Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy.

ABSTRACT
Genomewide analyses of distances between orthologous gene pairs from the ascidian species Ciona intestinalis and Ciona savignyi were compared with those of vertebrates. Combining this data with a detailed and careful use of vertebrate fossil records, we estimated the time of divergence between the two ascidians nearly 180 My. This estimation was obtained after correcting for the different substitution rates found comparing several groups of chordates; indeed we determine here that on average Ciona species evolve 50% faster than vertebrates.

No MeSH data available.


Related in: MedlinePlus

Regression line of divergence times derived from the fossil record (Table 1) and the correspondent distances (JTT method) in different vertebrate pairs. For the continuous line: 1. M. musculus – R. norvergicus, 2. X. laevis – X. tropicalis, 3. H. sapiens – B. taurus, 4. H. sapiens – M. musculus, 5. H. sapiens – M.  domestica, 6. H. sapiens – O. anatinus, 7. H. sapiens – G. gallus, 8. H. sapiens – X. laevis, 9. H. sapiens – T.  rubripes. For the dashed line: same pairs, comparisons involving nonplacental mammals (points 5 and 6) were excluded.
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fig1: Regression line of divergence times derived from the fossil record (Table 1) and the correspondent distances (JTT method) in different vertebrate pairs. For the continuous line: 1. M. musculus – R. norvergicus, 2. X. laevis – X. tropicalis, 3. H. sapiens – B. taurus, 4. H. sapiens – M. musculus, 5. H. sapiens – M. domestica, 6. H. sapiens – O. anatinus, 7. H. sapiens – G. gallus, 8. H. sapiens – X. laevis, 9. H. sapiens – T. rubripes. For the dashed line: same pairs, comparisons involving nonplacental mammals (points 5 and 6) were excluded.

Mentions: The graphical representation of the relationship between genomic divergence and time of divergence, in vertebrates only, has been presented in Figure 1. A clear linear relationship (i.e., molecular clock) was found, in good agreement with the conclusion achieved by likelihood-based method [11].


How fast is the sessile ciona?

Berná L, Alvarez-Valin F, D'Onofrio G - Comp. Funct. Genomics (2009)

Regression line of divergence times derived from the fossil record (Table 1) and the correspondent distances (JTT method) in different vertebrate pairs. For the continuous line: 1. M. musculus – R. norvergicus, 2. X. laevis – X. tropicalis, 3. H. sapiens – B. taurus, 4. H. sapiens – M. musculus, 5. H. sapiens – M.  domestica, 6. H. sapiens – O. anatinus, 7. H. sapiens – G. gallus, 8. H. sapiens – X. laevis, 9. H. sapiens – T.  rubripes. For the dashed line: same pairs, comparisons involving nonplacental mammals (points 5 and 6) were excluded.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2801007&req=5

fig1: Regression line of divergence times derived from the fossil record (Table 1) and the correspondent distances (JTT method) in different vertebrate pairs. For the continuous line: 1. M. musculus – R. norvergicus, 2. X. laevis – X. tropicalis, 3. H. sapiens – B. taurus, 4. H. sapiens – M. musculus, 5. H. sapiens – M. domestica, 6. H. sapiens – O. anatinus, 7. H. sapiens – G. gallus, 8. H. sapiens – X. laevis, 9. H. sapiens – T. rubripes. For the dashed line: same pairs, comparisons involving nonplacental mammals (points 5 and 6) were excluded.
Mentions: The graphical representation of the relationship between genomic divergence and time of divergence, in vertebrates only, has been presented in Figure 1. A clear linear relationship (i.e., molecular clock) was found, in good agreement with the conclusion achieved by likelihood-based method [11].

Bottom Line: Genomewide analyses of distances between orthologous gene pairs from the ascidian species Ciona intestinalis and Ciona savignyi were compared with those of vertebrates.Combining this data with a detailed and careful use of vertebrate fossil records, we estimated the time of divergence between the two ascidians nearly 180 My.This estimation was obtained after correcting for the different substitution rates found comparing several groups of chordates; indeed we determine here that on average Ciona species evolve 50% faster than vertebrates.

View Article: PubMed Central - PubMed

Affiliation: Laboratory of Animal Physiology and Evolution, Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy.

ABSTRACT
Genomewide analyses of distances between orthologous gene pairs from the ascidian species Ciona intestinalis and Ciona savignyi were compared with those of vertebrates. Combining this data with a detailed and careful use of vertebrate fossil records, we estimated the time of divergence between the two ascidians nearly 180 My. This estimation was obtained after correcting for the different substitution rates found comparing several groups of chordates; indeed we determine here that on average Ciona species evolve 50% faster than vertebrates.

No MeSH data available.


Related in: MedlinePlus