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Marta D. Mudry - One of the best experts on this subject based on the ideXlab platform.
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Analysis of the heterochromatin of Cebus (Primates, Platyrrhini) by micro-FISH and banding pattern comparisons
2011Co-Authors: Mariela Nieves, Edivaldo Herculano Corrêa De Oliveira, Paulo J S Amaral, Cleusa Yoshiko Nagamachi, Julio Cesar Pieczarka, María C. Mühlmann, Marta D. MudryAbstract:The karyotype of the neotropical primate genus Cebus (Platyrrhini: Cebidae), considered the most ancestral one, shows the greatest amount of heterochromatin described among Platyrrhini genera. Banding techniques and restriction enzyme digestion have previously revealed great variability of quantity and composition of heterochromatin in this genus. In this context, we use fluorescence in situ hybridization (FISH) to analyse this genomic region and discuss its possible role in the diversification of Cebus. We used a heterochromatin probe for chromosome 11 of Cebus libidinosus (11qHe+ CLI probe), obtained by chromosome microdissection. Twenty-six specimens belonging to the families Atelidae, Cebidae, Callitrichidae and Pithecidae (Platyrrhini) were studied. Fourteen out of 26 specimens were Cebus (Cebidae) individuals of C. libidinosus, C. xanthosternos, C. apella, C. nigritus, C. albifrons, C. kaapori and C. olivaceus. In Cebus specimens, we found 6 to 22 positive signals located in interstitial and telomeric positions along the different species. No hybridization signal was observed among the remaining Ceboidea species, thus reinforcing the idea of a Cebus-specific heterochromatin composed of a complex system of repetitive sequences.
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meiotic characterization and sex determination system of neotropical primates bolivian squirrel monkey saimiri boliviensis primates cebidae
2007Co-Authors: Eliana Ruth Steinberg, Mariela Nieves, Marta D. MudryAbstract:The chromosomal sex determination system differs among platyrrhine monkeys more than any other group of primates. Although a number of studies have investigated mitotic chromosomes across platyrrhine species, the meiotic chromosomes of many genera have not yet been described. The goal of this study was to characterize the sex determination system of Saimiri boliviensis. We described for the first time the meiotic cycle, confirming the sexual system in germ cells from testicular biopsies of four adult male S. boliviensis. All specimens were weighed and testicular volume was measured. We observed 22 bivalents corresponding to 2N = 44, and a "human-like" XY bivalent was found in diakinesis/metaphase I. In addition, mitotic studies from blood samples of both sexes were performed and G- and C-banding patterns agreed with previously reported karylogy of S. boliviensis boliviensis. Further meiotic studies should be performed in New World primates based on the great value of those studies for systematic evolutionary biology and conservation programs.
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RESEARCH ARTICLE Meiotic Characterization and Sex Determination System of Neotropical Primates: Bolivian Squirrel Monkey Saimiri boliviensis (Primates: Cebidae)
2007Co-Authors: Eliana Ruth Steinberg, Mariela Nieves, Marta D. MudryAbstract:The chromosomal sex determination system differs among platyrrhine monkeys more than any other group of primates. Although a number of studies have investigated mitotic chromosomes across platyrrhine species, the meiotic chromosomes of many genera have not yet been described. The goal of this study was to characterize the sex determination system of Saimiri boliviensis. We described for the first time the meiotic cycle, confirming the sexual system in germ cells from testicular biopsies of four adult male S. boliviensis. All specimens were weighed and testicular volume was measured. We observed 22 bivalents corresponding to 2N 544, and a ‘‘human-like’’ XY bivalent was found in diakinesis/ metaphase I. In addition, mitotic studies from blood samples of both sexes were performed and G- and C-banding patterns agreed with previously reported karylogy of S. boliviensis boliviensis. Further meiotic studies should be performed in New World primates based on the great value of those studies for systematic evolutionary biology and conservation
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Chromosomal localization of the telomeric (TTAGGG)n sequence in eight species of New World Primates (Neotropical Primates, Platyrrhini).
2007Co-Authors: Marta D. Mudry, Mariela Nieves, Alejandro D. BolzánAbstract:Chromosomal localization of the telomeric sequence (TTAGGG)n in eight New World Primates (Platyrrhini) (Alouatta caraya, Alouatta palliata, Alouatta guariba clamitans, Aotus azarae
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coii a useful tool for inferring phylogenetic relationships among new world monkeys primates Platyrrhini
2003Co-Authors: Marina S Ascunce, Esteban Hasson, Marta D. MudryAbstract:In this study we evaluated the performance of the cytochrome c oxidase subunit II (COII) mitochondrial gene as a tool for inferring phylogenetic relationships among platyrrhines. Twenty-nine COII sequences were examined in seven platyrrhine genera (Alouatta, Ateles, Lagothrix, Brachyteles, Cebus, Saimiri, and Aotus) employing parsimony and distance methods. Phylogenetic signal (g1) was present in all codon positions, despite the transitional saturation detected at the third position. In tree reconstructions bootstrap support values decreased abruptly above the generic level. Parsimony trees based on weighted transversions (tv : ts, 10 : 1) at the third position showed similar topologies. The utility of COII in phylogenetic studies among platyrrhines seems to be limited, due to its low rate of replacement substitutions and a relatively fast saturation of silent substitutions at third codon positions. Our data suggest that its main utility in platyrrhine systematics lies at the intrageneric level.
Jeffrey Rogers - One of the best experts on this subject based on the ideXlab platform.
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microsatellite polymorphisms in bolivian squirrel monkeys saimiri boliviensis
1999Co-Authors: Shelly M Witte, Jeffrey RogersAbstract:Two different approaches were used to identify new microsatellite polymorphisms among captive Bolivian squirrel monkeys (Saimiri boliviensis). In the first case, PCR primers for published human microsatellite loci were screened using genomic DNA from squirrel monkeys. Six polymorphic loci were identified using DNA samples from 19 unrelated individuals. The average heterozygosity among these six loci is 0.73. In the second set of experiments, a DNA library was created from Saimiri genomic DNA, and clones were selected from that library by screening with probes containing di-, tri-, and tetranucleotide repeats. Six novel microsatellites were identified this way, with an average heterozygosity of 0.59. Primer pairs for these six cloned microsatellites were also screened using a series of DNA samples from ten other platyrrhine species to assess the potential utility of these loci in other taxa. This study provides 12 new DNA polymorphisms that will be useful for various studies of this genus and demonstrates that both approaches can be used to develop new DNA polymorphisms in platyrrhine primates. Am. J. Primatol. 47:75–84, 1999. © 1999 Wiley-Liss, Inc.
Pierre-olivier Antoine - One of the best experts on this subject based on the ideXlab platform.
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3D models related to the publication: New record of Neosaimiri (Cebidae, Platyrrhini) from the late Middle Miocene of Peruvian Amazonia
2020Co-Authors: Laurent Marivaux, Rodolfo Salas-gismondi, Pierre-olivier AntoineAbstract:This contribution contains the 3D models of the fossil teeth of a small-bodied platyrrhine primate, Neosaimiri cf. fieldsi (Cebinae, Cebidae, Platyrrhini) discovered from Laventan deposits (late Middle Miocene) of Peruvian Amazonia, San Martin Department (TAR-31: Tarapoto/Juan Guerra vertebrate fossil-bearing locus n°31). These fossils were described and figured in the following publication: Marivaux et al. (2020), New record of Neosaimiri (Cebidae, Platyrrhini) from the late Middle Miocene of Peruvian Amazonia. Journal of Human Evolution. https://doi.org/10.1016/j.jhevol.2020.102835
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New record of Neosaimiri (Cebidae, Platyrrhini) from the late Middle Miocene of Peruvian Amazonia
2020Co-Authors: Laurent Marivaux, Rodolfo Salas-gismondi, Myriam Boivin, Francois Pujos, Walter Aguirre-diaz, Aldo Benites-palomino, Guillaume Billet, Julia V. Tejada-lara, Rafael Varas-malca, Pierre-olivier AntoineAbstract:The Honda Group of La Venta, Colombia, has yielded a wide array of crown platyrrhine primates, documenting the late Middle Miocene epoch (ca. 13.1–12.6 Ma, Laventan South American Land Mammal Age). Although exceptional, this record represents only a snapshot of the evolutionary history of New World monkeys because virtually none of the primate taxa recorded at La Venta had so far been found elsewhere. We describe here few dental remains of a cebine platyrrhine discovered from Laventan deposits in the San Martín Department of Peru (Peruvian Amazonia). The primate dental specimens from that new fossil-bearing locality (TAR-31) are strongly reminiscent morphologically of the teeth of Neosaimiri fieldsi from La Venta. However, given that several aspects of the dental variability from TAR-31 are unknown, we prefer to provide an assignment with open nomenclature (i.e., Neosaimiri cf. fieldsi), instead of formally referring these remains to N. fieldsi, pending the discovery of additional specimens. The occurrence of Neosaimiri in Peru, in coeval deposits of La Venta, thus represents a second and southernmost record of that low-latitude genus in the Neotropics, thereby demonstrating its wide distribution along the northwestern edge of the Pebas Mega-Wetland System, in tropical western South America.
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3D model related to the publication: A platyrrhine talus from the early Miocene of Peru (Amazonian Madre de Dios Sub-Andean Zone)
2019Co-Authors: Marivaux Laurent, Salas-gismondi Rodolfo, Pierre-olivier AntoineAbstract:International audienceThis contribution contains the 3D model of the fossil talus of a small-bodied anthropoid primate (Platyrrhini, Cebidae, Cebinae) discovered from lower Miocene deposits of Peruvian Amazonia (MD-61 locality, Upper Madre de Dios Basin). This fossil was described and figured in the following publication: Marivaux et al. (2012), A platyrrhine talus from the early Miocene of Peru (Amazonian Madre de Dios Sub-Andean Zone). Journal of Human Evolution
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neotropics provide insights into the emergence of new world monkeys new dental evidence from the late oligocene of peruvian amazonia
2016Co-Authors: Laurent Marivaux, Sylvain Adnet, Myriam Boivin, Francois Pujos, Anusha Ramdarshan, Ali Altamiranosierra, Rodolfo Salasgismondi, Julia V Tejadalara, Pierre-olivier AntoineAbstract:Recent field efforts in Peruvian Amazonia (Contamana area, Loreto Department) have resulted in the discovery of a late Oligocene (ca. 26.5 Ma; Chambira Formation) fossil primate-bearing locality (CTA-61). In this paper, we analyze the primate material consisting of two isolated upper molars, the peculiar morphology of which allows us to describe a new medium-sized platyrrhine monkey: Canaanimico amazonensis gen. et sp. nov. In addition to the recent discovery of Perupithecus ucayaliensis, a primitive anthropoid taxon of African affinities from the alleged latest Eocene Santa Rosa locality (Peruvian Amazonia), the discovery of Canaanimico adds to the evidence that primates were well-established in the Amazonian Basin during the Paleogene. Our phylogenetic results based on dental evidence show that none of the early Miocene Patagonian taxa (Homunculus, Carlocebus, Soriacebus, Mazzonicebus, Dolichocebus, Tremacebus, and Chilecebus), the late Oligocene Bolivian Branisella, or the Peruvian Canaanimico, is nested within a crown platyrrhine clade. All these early taxa are closely related and considered here as stem Platyrrhini. Canaanimico is nested within the Patagonian Soriacebinae, and closely related to Soriacebus, thereby extending back the soriacebine lineage to 26.5 Ma. Given the limited dental evidence, it is difficult to assess if Canaanimico was engaged in a form of pitheciine-like seed predation as is observed in Soriacebus and Mazzonicebus, but dental microwear patterns recorded on one upper molar indicate that Canaanimico was possibly a fruit and hard-object eater. If Panamacebus, a recently discovered stem cebine from the early Miocene of Panama, indicates that the crown platyrrhine radiation was already well underway by the earliest Miocene, Canaanimico indicates in turn that the "homunculid" radiation (as a part of the stem radiation) was well underway by the late Oligocene. These new data suggest that the stem radiation likely occurred in the Neotropics during the Oligocene, and that several stem lineages independently reached Patagonia during the early Miocene. Finally, we are still faced with a "layered" pattern of platyrrhine evolution, but modified in terms of timing of cladogeneses. If the crown platyrrhine radiation occurred in the Neotropics around the Oligocene-Miocene transition (or at least during the earliest Miocene), it was apparently concomitant with the diversification of the latest stem forms in Patagonia.
Eliana Ruth Steinberg - One of the best experts on this subject based on the ideXlab platform.
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meiotic characterization and sex determination system of neotropical primates bolivian squirrel monkey saimiri boliviensis primates cebidae
2007Co-Authors: Eliana Ruth Steinberg, Mariela Nieves, Marta D. MudryAbstract:The chromosomal sex determination system differs among platyrrhine monkeys more than any other group of primates. Although a number of studies have investigated mitotic chromosomes across platyrrhine species, the meiotic chromosomes of many genera have not yet been described. The goal of this study was to characterize the sex determination system of Saimiri boliviensis. We described for the first time the meiotic cycle, confirming the sexual system in germ cells from testicular biopsies of four adult male S. boliviensis. All specimens were weighed and testicular volume was measured. We observed 22 bivalents corresponding to 2N = 44, and a "human-like" XY bivalent was found in diakinesis/metaphase I. In addition, mitotic studies from blood samples of both sexes were performed and G- and C-banding patterns agreed with previously reported karylogy of S. boliviensis boliviensis. Further meiotic studies should be performed in New World primates based on the great value of those studies for systematic evolutionary biology and conservation programs.
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RESEARCH ARTICLE Meiotic Characterization and Sex Determination System of Neotropical Primates: Bolivian Squirrel Monkey Saimiri boliviensis (Primates: Cebidae)
2007Co-Authors: Eliana Ruth Steinberg, Mariela Nieves, Marta D. MudryAbstract:The chromosomal sex determination system differs among platyrrhine monkeys more than any other group of primates. Although a number of studies have investigated mitotic chromosomes across platyrrhine species, the meiotic chromosomes of many genera have not yet been described. The goal of this study was to characterize the sex determination system of Saimiri boliviensis. We described for the first time the meiotic cycle, confirming the sexual system in germ cells from testicular biopsies of four adult male S. boliviensis. All specimens were weighed and testicular volume was measured. We observed 22 bivalents corresponding to 2N 544, and a ‘‘human-like’’ XY bivalent was found in diakinesis/ metaphase I. In addition, mitotic studies from blood samples of both sexes were performed and G- and C-banding patterns agreed with previously reported karylogy of S. boliviensis boliviensis. Further meiotic studies should be performed in New World primates based on the great value of those studies for systematic evolutionary biology and conservation
Shelly M Witte - One of the best experts on this subject based on the ideXlab platform.
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microsatellite polymorphisms in bolivian squirrel monkeys saimiri boliviensis
1999Co-Authors: Shelly M Witte, Jeffrey RogersAbstract:Two different approaches were used to identify new microsatellite polymorphisms among captive Bolivian squirrel monkeys (Saimiri boliviensis). In the first case, PCR primers for published human microsatellite loci were screened using genomic DNA from squirrel monkeys. Six polymorphic loci were identified using DNA samples from 19 unrelated individuals. The average heterozygosity among these six loci is 0.73. In the second set of experiments, a DNA library was created from Saimiri genomic DNA, and clones were selected from that library by screening with probes containing di-, tri-, and tetranucleotide repeats. Six novel microsatellites were identified this way, with an average heterozygosity of 0.59. Primer pairs for these six cloned microsatellites were also screened using a series of DNA samples from ten other platyrrhine species to assess the potential utility of these loci in other taxa. This study provides 12 new DNA polymorphisms that will be useful for various studies of this genus and demonstrates that both approaches can be used to develop new DNA polymorphisms in platyrrhine primates. Am. J. Primatol. 47:75–84, 1999. © 1999 Wiley-Liss, Inc.