Temat: concerted evolution

Skocz do pozycji: 1.

Tytuł:: Ancient duplication, coevolution, and selection at the MHC class IIA and IIB genes of birds
Autorzy:: Babik, Wiesław
Edwards, Scott V.
Minias, Piotr
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 2.

Tytuł:: Molecular evolution of enolase
Autorzy:: Piast, Michał
Kustrzeba-Wójcicka, Irena
Matusiewicz, Małgorzata
Banaś, Teresa
Tematy:: concerted evolution
gene duplication
"birth and death" evolution
glycolysis
vertebrates evolution
enolase; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1041439.pdf Link otwiera się w nowym oknie
Opis:: Enolase (EC 4.2.1.11) is an enzyme of the glycolytic pathway catalyzing the dehydratation reaction of 2-phosphoglycerate. In vertebrates the enzyme exists in three isoforms: α, β and γ. The amino-acid and nucleotide sequences deposited in the GenBank and SwissProt databases were subjected to analysis using the following bioinformatic programs: ClustalX, GeneDoc, MEGA2 and S.I.F.T. (sort intolerant from tolerant). Phylogenetic trees of enolases created with the use of the MEGA2 program show evolutionary relationships and functional diversity of the three isoforms of enolase in vertebrates. On the basis of calculations and the phylogenetic trees it can be concluded that vertebrate enolase has evolved according to the "birth and death" model of evolution. An analysis of amino acid sequences of enolases: non-neuronal (NNE), neuron specific (NSE) and muscle specific (MSE) using the S.I.F.T. program indicated non-uniform number of possible substitutions. Tolerated substitutions occur most frequently in α-enolase, while the lowest number of substitutions has accumulated in γ-enolase, which may suggest that it is the most recently evolved isoenzyme of enolase in vertebrates.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The phylogenetic position of Vincetoxicum pannonicum (Borhidi) holub supports the species’ allopolyploid hybrid origin
Autorzy:: Horvath, O.
Laczko, L.
Lisztes-Szabo, Z.
Molnar V., A.
Popiela, A.
Sramko, G.
Tematy:: allopolyploidy
concerted evolution
diploidization
gene tree incongruence
hybridization
Pannonian endemism
nrITS cloning
vulnerable species; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/2130712.pdf Link otwiera się w nowym oknie
Opis:: The Pannonian endemic species Vincetoxicum pannonicum was described from specimens collected in Hungary and occurs at only few locations. It is considered “vulnerable” according to the International Red List. The chromosome set was reported to be tetraploid, and the species was hypothesized to be an allotetraploid hybrid of the Balkan species V. fuscatum and the Adriatic species V. hirundinaria subsp. adriaticum. We investigated the origin of V. pannonicum using molecular phylogenetic methods by separately analyzing the multicopy nuclear ribosomal internal transcribed spacer (nrITS) and the plastid-encoded trnH-psbA DNA regions and by evaluating discrepancies between the produced gene trees. Paralogs in the nrITS region clustered in two main groups, one of which was closest to V. fuscatum, and the other included V. hirundinaria subsp. adriaticum. According to trnH-psbA sequences, V. pannonicum and V. hirundinaria subsp. adriaticum formed a single group. Our results show that V. pannonicum diversified because of hybrid speciation, in which V. fuscatum was the pollen donor. We discovered a similar placement of V. maeoticum, which suggests a further hybridization event between V. fuscatum and a species of the V. hirundinaria group. Our genome-size estimate indicates almost sixfold larger genome size in V. pannonicum compared to the maternal diploid parent, suggesting hexaploidy; however, V. pannonicum is tetraploid. This may suggest cytological diploidization in the allopolyploid V. pannonicum. We observed substantial genetic distance between V. hirundinaria subsp. adriaticum and all other subspecies of V. hirundinaria, and we therefore propose that V. adriaticum should be regarded as a separate species.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Concerted evolution of body mass and cell size : similar patterns among species of birds (Galliformes) and mammals (Rodentia)
Autorzy:: Kilarski, Wincenty
Czarnołęski, Marcin
Kozłowski, Jan
Pawlik, Katarzyna
Pis, Tomasz
Dragosz-Kluska, Dominika
Łabęcka, Anna Maria
Kapustka, Filip
Opis:: Cell size plays a role in body size evolution and environmental adaptations. Addressing these roles, we studied body mass and cell size in Galliformes birds and Rodentia mammals, and collected published data on their genome sizes. In birds, we measured erythrocyte nuclei and basal metabolic rates (BMRs). In birds and mammals, larger species consistently evolved larger cells for five cell types (erythrocytes, enterocytes, chondrocytes, skin epithelial cells, and kidney proximal tubule cells) and evolved smaller hepatocytes. We found no evidence that cell size differences originated through genome size changes. We conclude that the organism-wide coordination of cell size changes might be an evolutionarily conservative characteristic, and the convergent evolutionary body size and cell size changes in Galliformes and Rodentia suggest the adaptive significance of cell size. Recent theory predicts that species evolving larger cells waste less energy on tissue maintenance but have reduced capacities to deliver oxygen to mitochondria and metabolize resources. Indeed, birds with larger size of the above mentioned cell types and smaller hepatocytes have evolved lower mass-specific BMRs. We propose that the inconsistent pattern in hepatocytes derives from the efficient delivery system to hepatocytes, combined with their intense involvement in supracellular function and anabolic activity.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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