An X&lt;sub&gt;1&lt;/sub&gt;X&lt;sub&gt;1&lt;/sub&gt;X&lt;sub&gt;2&lt;/sub&gt;X&lt;sub&gt;2&lt;/sub&gt;/X&lt;sub&gt;1&lt;/sub&gt;X&lt;sub&gt;2&lt;/sub&gt;Y mechanism of sex determination in a South American rodent, &lt;i&gt;Deltamys kempi&lt;/i&gt; (Rodentia, Cricetidae)

Sbalqueiro, Ives José; Mattevi, Margarete S.; Oliveira, Luiz Flamarion B.

doi:10.1159/000132029

Cited by 19 publications

(10 citation statements)

References 12 publications

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“…Our results do not give support to the claim of Massoia (1981), Sbalqueiro, Mattevi & Oliveira (1984), and others who accord full generic status to Deltamys kempi. Electrophoretically, this species is linked with species of the genus Akodon, although in the cladistic analysis, it appears as a sister group of species belonging to the subgenus Akodon, showing as a synapomorphous fixed allele (Es-7d) which is absent in species of Akodon (sensu stricto).…”

Section: Intertribal and Subtribal Genetic Distancesupporting

confidence: 90%

New studies on allozyme genetic distance and variability in akodontine rodents (Cricetidae) and their systematic implications

Barrantes

Ortells

Reig

1993

Biological Journal of the Linnean Society

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Allozyme genetic distance and variability were studied by horizontal starch gel electrophoresis in I I species of rodents of the tribe Akodontini representing four different genera. One species of the phyllotine Calomw was used as an outgroup for comparisons. Thirty presumptive loci were assessed in a total of 172 specimens. Only three of 30 loci were found to be monomorphic in the whole sample. Levels of polymorphism (P) and mean heterozygosity (H) were dependent on esterase loci whirh increase H values by 6.26"(, on average. Nei's jackknife genetic distances among conspecific populations were found not to differ significantly with geographic distance. Phenetic and cladistic interspecific analysis coincided in indicating the monophyletic nature of the akodontine clade, and its splitting into two sharply differentiated subclades: one comprising species referred to as Abrolhrix, Chelemys and Geoxus, another comprising species of Akodon (including Deltamys) and Oqmycterus. Thus, the separateness of a southern Andean branch in the cladogenesis of the Akodontini was confirmed, as well as the early recognition of Abrothrix as a full genus, and the recent claim of Spotorno to include in this genus other species formerly classified as Akodonjelskii, A k . andinus and Ak. olivareus ADDITIONAL KEY WORDS: -Akodontini ~ electromorphic genetic distancesgenetic variation ~ phrnctic and cladistic analysis ~ systematic relationships.

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Section: Intertribal and Subtribal Genetic Distancesupporting

confidence: 90%

New studies on allozyme genetic distance and variability in akodontine rodents (Cricetidae) and their systematic implications

Barrantes

Ortells

Reig

1993

Biological Journal of the Linnean Society

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“…It is also remarkable that Deltamys kempi is one of the few rodents to which multiple sex system has been described (X 1 X 1 X 2 X 2 / X 1 X 2 Y) (Sbalqueiro et al 1984). …”

Section: Resultsmentioning

confidence: 99%

Advances in cytogenetics of Brazilian rodents: cytotaxonomy, chromosome evolution and new karyotypic data

Di-Nizo¹,

Banci²,

Sato-Kuwabara³

et al. 2017

CCG

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Rodents constitute one of the most diversified mammalian orders. Due to the morphological similarity in many of the groups, their taxonomy is controversial. Karyotype information proved to be an important tool for distinguishing some species because some of them are species-specific. Additionally, rodents can be an excellent model for chromosome evolution studies since many rearrangements have been described in this group.This work brings a review of cytogenetic data of Brazilian rodents, with information about diploid and fundamental numbers, polymorphisms, and geographical distribution. We point out that, even with the recent efforts on cytogenetic studies in this group, many species lack karyotypic data. Moreover, we describe for the first time the karyotype of Carterodon sulcidens (Lund, 1838) (Family Echimyidae), a new fundamental number for an undescribed species of Neacomys Thomas, 1900 (Family Cricetidae, Subfamily Sigmodontinae), and illustrate the karyotype of a Brazilian specimen of Mus musculus Linnaeus, 1758 (Family Muridae). This review compiles the cytogenetic data on Brazilian rodents reported in the last three decades, after the last revision published in 1984, including synonyms, chromosomal variations, and geographic distribution. Additionally, it also reinforces that Brazilian biodiversity is still poorly known, considering the new data reported here.

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“…, 2005), only 117 D. kempi specimens have been reported (Thomas, 1917; Massoia, 1964; Fronza et al. , 1981; Sbalqueiro et al. , 1984; Castro et al.…”

Section: Introductionmentioning

confidence: 99%

DNA sequence analysis and the phylogeographical history of the rodent Deltamys kempi (Sigmodontinae, Cricetidae) on the Atlantic Coastal Plain of south of Brazil

Montes

Oliveira

Bonatto

et al. 2008

J of Evolutionary Biology

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The rodent Deltamys kempiThomas, 1917 is found on the Coastal Plain – a recently formed geographic region located on Brazil’s south‐east coast. Considering that Deltamys is the only South American sigmodontine with a sex chromosome system of type X1X1X2X2/X1X2Y, this investigation was focused on the phylogeographic history of this taxon by using gene sequence analysis, trying to clarify when Deltamys differentiated, what was its centre of diversification, and what were the probable routes it used to reach its present distribution. We analysed sequences of the mitochondrial cytochrome b gene and nuclear recombination activating gene 2, performed cranial measurements and searched for centric fusions in individuals collected in distinct localities. The results, clearly demonstrate that D. kempi, on the Coastal Plain, divided into two groups, one occupying a small portion to the north of this region and the other spreading widely to the south. In this process, the phenomena of marine transgression and regressions which moulded its habitat, together with the occurrence of successive chromosomal rearrangements, were certainly the fundamental factors in shaping D. kempi diversification.

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An X<sub>1</sub>X<sub>1</sub>X<sub>2</sub>X<sub>2</sub>/X<sub>1</sub>X<sub>2</sub>Y mechanism of sex determination in a South American rodent, <i>Deltamys kempi</i> (Rodentia, Cricetidae)

Cited by 19 publications

References 12 publications

New studies on allozyme genetic distance and variability in akodontine rodents (Cricetidae) and their systematic implications

New studies on allozyme genetic distance and variability in akodontine rodents (Cricetidae) and their systematic implications

Advances in cytogenetics of Brazilian rodents: cytotaxonomy, chromosome evolution and new karyotypic data

DNA sequence analysis and the phylogeographical history of the rodent Deltamys kempi (Sigmodontinae, Cricetidae) on the Atlantic Coastal Plain of south of Brazil

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