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A. Houben - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of reliable methods to differentiate between mono- and holocentricity
Chromosoma, 2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, T. Souza, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum (Thunb.) Drège (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. In contrast to the expectation, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere-associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of two centromere-localised satellite repeats. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade, and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. In this context, methods suitable for the identification of holocentromeres are discussed.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of a reliable method to differentiate between mono- and holocentricity
2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, Thaíssa Boldieri De Souza, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered as a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum L. f. Drege (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. Unlike expected, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of a centromere-localised satellite repeat. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. Methods suitable for the identification of holocentromeres are discussed.
M. Baez - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of reliable methods to differentiate between mono- and holocentricity
Chromosoma, 2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, T. Souza, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum (Thunb.) Drège (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. In contrast to the expectation, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere-associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of two centromere-localised satellite repeats. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade, and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. In this context, methods suitable for the identification of holocentromeres are discussed.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of a reliable method to differentiate between mono- and holocentricity
2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, Thaíssa Boldieri De Souza, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered as a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum L. f. Drege (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. Unlike expected, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of a centromere-localised satellite repeat. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. Methods suitable for the identification of holocentromeres are discussed.
Hans Peter Linder - One of the best experts on this subject based on the ideXlab platform.
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The embryology and systematic relationships of Prionium serratum (Juncaceae: Juncales).
American journal of botany, 1997Co-Authors: S.l. Munro, Hans Peter LinderAbstract:Although Prionium is included in Juncaceae, rbcL sequence data indicate that Juncaceae is paraphyletic, with most genera closer to Cyperaceae than to Prionium. Cyperaceae and Juncales have embryological synapomorphies: thus embryology is used to test the monophyly of Juncaceae. The embryology of Prionium is described and its systematic position discussed. Material was prepared using standard methods of paraffin embedding. Additional embryological data were extracted from the literature. The anther in Prionium is tetrasporangiate, and the wall has an epidermis, an endothecium and middle layer, and an irregularly bilayered, glandular secretory tapetum. Microsporogenesis is probably simultaneous; pollen is ulcerate with a granular exine, in tetrahedral and cross tetrads, and trinucleate at release. The trilocular ovary contains many crassinucellate ovules probably having a Polygonum-type embryo sac. Endosperm is helobial and the embryo is of the Onagrad type, Juncus variation. The seed is testal-tegmic and germination is epigeal. The embryology of Prionium is most like that of Juncaceae, which shares several synapomorphies with Cyperaceae. Some of the characters in Cyperaceae may be interpreted as specialized forms of those found in Juncaceae. Embryology supports the monophyly of Cyperaceae and Juncales, but not Juncaceae; thus the position of Prionium remains unresolved.
A. L. L. Vanzela - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of reliable methods to differentiate between mono- and holocentricity
Chromosoma, 2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, T. Souza, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum (Thunb.) Drège (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. In contrast to the expectation, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere-associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of two centromere-localised satellite repeats. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade, and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. In this context, methods suitable for the identification of holocentromeres are discussed.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of a reliable method to differentiate between mono- and holocentricity
2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, Thaíssa Boldieri De Souza, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered as a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum L. f. Drege (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. Unlike expected, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of a centromere-localised satellite repeat. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. Methods suitable for the identification of holocentromeres are discussed.
A. Pedrosa-harand - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of reliable methods to differentiate between mono- and holocentricity
Chromosoma, 2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, T. Souza, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum (Thunb.) Drège (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. In contrast to the expectation, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere-associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of two centromere-localised satellite repeats. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade, and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. In this context, methods suitable for the identification of holocentromeres are discussed.
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Analysis of the small chromosomal Prionium serratum (Cyperid) demonstrates the importance of a reliable method to differentiate between mono- and holocentricity
2020Co-Authors: M. Baez, Y. T. Kuo, Y. Dias, A. Boudichevskaia, J. Fuchs, V. Schubert, A. L. L. Vanzela, A. Pedrosa-harand, Thaíssa Boldieri De Souza, A. HoubenAbstract:For a long time, the Cyperid clade (Thurniceae-Juncaceae-Cyperaceae) was considered as a group of species possessing holocentromeres exclusively. The basal phylogenetic position of Prionium serratum L. f. Drege (Thurniceae) within Cyperids makes this species an important specimen to understand the centromere evolution within this clade. Unlike expected, the chromosomal distribution of the centromere-specific histone H3 (CENH3), alpha-tubulin and different centromere associated post-translational histone modifications (H3S10ph, H3S28ph and H2AT120ph) demonstrate a monocentromeric organisation of P. serratum chromosomes. Analysis of the high-copy repeat composition resulted in the identification of a centromere-localised satellite repeat. Hence, monocentricity was the ancestral condition for the Juncaceae-Cyperaceae-Thurniaceae Cyperid clade and holocentricity in this clade has independently arisen at least twice after differentiation of the three families, once in Juncaceae and the other one in Cyperaceae. Methods suitable for the identification of holocentromeres are discussed.
