Karyotypic analyses and morphological comments on the endemic and endangered Brazilian painted tree rat Callistomys pictus (Rodentia, Echimyidae)

Ventura, Karen; Ximenes, Gilson Evaristo Iack; Pardini, Renata; Sousa, Marcos Antônio Nóbrega de; Yonenaga‐Yassuda, Yatiyo; Silva, Maria José de J.

doi:10.1590/s1415-47572008000400016

Cited by 7 publications

(11 citation statements)

References 20 publications

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“…Lima et al [16] described a karyotype with 2n = 66/FN = 106 for M. didelphoides found in Amazonas State, Brazil. In a mastership dissertation, Leal-Mesquita (1991) [17] described a karyotype with 2n = 70/FN = 120 for Makalata sp. found in Rondonia State, Brazil, and referred to it as M. armata [17].…”

Section: Introductionmentioning

confidence: 99%

“…In a mastership dissertation, Leal-Mesquita (1991) [17] described a karyotype with 2n = 70/FN = 120 for Makalata sp. found in Rondonia State, Brazil, and referred to it as M. armata [17]. In another mastership dissertation, Lopes [10] described four karyotypes for this genus.…”

Section: Introductionmentioning

confidence: 99%

“…MSc dissertation. Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil) and mentioned by [ 17 ] in their Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…found in Rondonia State, Brazil, and referred to it as M . armata [ 17 ]. In another mastership dissertation, Lopes [ 10 ] described four karyotypes for this genus.…”

Section: Introductionmentioning

confidence: 99%

“…Mastership dissertation. Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil (mentioned in [ 17 ]); Lopes APM (2016)** Estudos citogenéticos, filogenéticos e padrão de distribuição de Makalata (Rodentia: Echimyidae) do leste da Amazônia e do nordeste do Cerrado. Rio de Janeiro: Mastership dissertation, Instituto Oswaldo Cruz, Fiocruz [ 10 ].…”

Section: Introductionunclassified

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Karyotypic diversity within the genus Makalata (Echimyidae: Echimyinae) of Brazilian Amazon: Chromosomal evidence for multiple species

Pereira¹,

Malcher²,

Nagamachi³

et al. 2020

PLoS ONE

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The genus Makalata is a taxonomically complex group of rodents on which few cytogenetic studies have been performed. Most of the published karyotypes were described based only on conventional chromosome staining. Here, we studied the karyotypes of Makalata from two Brazilian Amazonian states, Amapá and Pará , by Giemsa-staining, G-and C-banding, AgNO3-staining and FISH with 18S rDNA and telomeric sequences probes. We observed 2n = 66/FN = 124 in the Pará state population in Makalata sp; and 2n = 72/FN = 128 in the Amapá state population in M. didelphoides. Multiple chromosome rearrangements may have given rise to these karyotypes, which differ significantly from each other and from those reported in the literature. The chromosomal differences among the described Makalata karyotypes can act as a barrier to gene flow; since they are also associated with geographic barriers (e.g., rivers) and numerous molecular differences, they could be seen as evidence for reproductive isolation of populations from genus Makalata. Our data suggest that the genus is chromosomally diverse and the karyotypes may belong to different species. These karyotypes may prove useful as taxonomic markers for these rodents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…MSc dissertation. Departamento de Biologia, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil) and mentioned by [ 17 ] in their Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…found in Rondonia State, Brazil, and referred to it as M . armata [ 17 ]. In another mastership dissertation, Lopes [ 10 ] described four karyotypes for this genus.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionunclassified

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Karyotypic diversity within the genus Makalata (Echimyidae: Echimyinae) of Brazilian Amazon: Chromosomal evidence for multiple species

Pereira¹,

Malcher²,

Nagamachi³

et al. 2020

PLoS ONE

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Identification of two independent X-autosome translocations in closely related mammalian (Proechimys) species

Silva

Costa

Pieczarka

et al. 2019

Sci Rep

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Multiple sex chromosome systems have been described for several mammalian orders, with different species from the same genus sharing the same system (e.g., X1X2Y or XY1Y2). This is important because the translocated autosome may be influenced by the evolution of the recipient sex chromosome, and this may be related to speciation. It is often thought that the translocation of an autosome to a sex chromosome may share a common origin among phylogenetically related species. However, the neo-X chromosomes of Proechimys goeldii (2n = 24♀, 25♂/NFa = 42) and Proechimys gr. goeldii (2n = 16♀, 17♂/NFa = 14) have distinct sizes and morphologies that have made it difficult to determine whether they have the same or different origins. This study investigates the origins of the XY1Y2 sex chromosome determination system in P. goeldii (PGO) and P. gr. goeldii (PGG) and elucidates the chromosomal rearrangements in this low-diploid-number group of Proechimys species. Toward this end, we produced whole-chromosome probes for P. roberti (PRO; 2n = 30♂/NFa = 54) and P. goeldii (2n = 25♂/NFa = 42) and used them in comparative chromosomal mapping. Our analysis reveals that multiple translocations and inversions are responsible for the karyotype diversity of these species, with only three whole-chromosomes conserved between PRO and PGO and eight between PGO and PGG. Our data indicate that multiple sex chromosome systems have originated twice in Proechimys. As small populations are prone to the fixation of chromosomal rearrangements, we speculate that biological features of Rodentia contribute to this fixation. We also highlight the potential of these rodents as a model for studying sex chromosome evolution.

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Mitogenomic phylogeny, diversification, and biogeography of South American spiny rats

et al. 2016

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Echimyidae is one of the most speciose and ecologically diverse rodent families in the world, occupying a wide range of habitats in the Neotropics. However, a resolved phylogeny at the genus-level is still lacking for these 22 genera of South American spiny rats, including the coypu (Myocastorinae), and 5 genera of West Indian hutias (Capromyidae) relatives. Here, we used Illumina shotgun sequencing to assemble 38 new complete mitogenomes, establishing Echimyidae, and Capromyidae as the first major rodent families to be completely sequenced at the genus-level for their mitochondrial DNA. Combining mitogenomes and nuclear exons, we inferred a robust phylogenetic framework that reveals several newly supported nodes as well as the tempo of the higher level diversification of these rodents. Incorporating the full generic diversity of extant echimyids leads us to propose a new higher level classification of two subfamilies: Euryzygomatomyinae and Echimyinae. Of note, the enigmatic Carterodon displays fast-evolving mitochondrial and nuclear sequences, with a long branch that destabilizes the deepest divergences of the echimyid tree, thereby challenging the sister-group relationship between Capromyidae and Euryzygomatomyinae. Biogeographical analyses involving higher level taxa show that several vicariant and dispersal events impacted the evolutionary history of echimyids. The diversification history of Echimyidae seems to have been influenced by two major historical factors, namely (1) recurrent connections between Atlantic and Amazonian Forests and (2) the Northern uplift of the Andes.

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Karyotypic analyses and morphological comments on the endemic and endangered Brazilian painted tree rat Callistomys pictus (Rodentia, Echimyidae)

Cited by 7 publications

References 20 publications

Karyotypic diversity within the genus Makalata (Echimyidae: Echimyinae) of Brazilian Amazon: Chromosomal evidence for multiple species

Karyotypic diversity within the genus Makalata (Echimyidae: Echimyinae) of Brazilian Amazon: Chromosomal evidence for multiple species

Identification of two independent X-autosome translocations in closely related mammalian (Proechimys) species

Mitogenomic phylogeny, diversification, and biogeography of South American spiny rats

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