Variation in chromosomes of the cotton rat, Sigmodon hispidus

Eg, Zimmerman; Mr, Lee

doi:10.1007/bf00285206

Cited by 18 publications

(4 citation statements)

References 15 publications

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“…In parallel, species within this genus are characterized by high rates of karyotype repatterning (Fagundes et al ., ; Hass, Sbalqueiro & Müller, ; Ventura et al ., ). The same observation holds for Sigmodon and Oryzomys (Oryzomyini) which both exhibit an elevated rate of intraspecific polymorphism, as well as high interspecific chromosomal diversity (Hsu, ; Lee & Zimmerman, ; Zimmerman & Lee, ; Maia & Hulak, ; Koop et al ., ; Aguilera, Perez‐Zapata & Martino, ; Volobouev & Aniskin, ; Swier et al ., ). A similar situation occurs in Peromyscus where karyotypic differentiation is high among species (Hsu & Arrighi, , ; Robbins & Baker, ) and within which pericentric inversion polymorphisms are frequent (e.g.…”

Section: Rates Of Chromosomal Change Versus Polymorphismmentioning

confidence: 97%

Chromosomal polymorphism in mammals: an evolutionary perspective

2015

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Although chromosome rearrangements (CRs) are central to studies of genome evolution, our understanding of the evolutionary consequences of the early stages of karyotypic differentiation (i.e. polymorphism), especially the non-meiotic impacts, is surprisingly limited. We review the available data on chromosomal polymorphisms in mammals so as to identify taxa that hold promise for developing a more comprehensive understanding of chromosomal change. In doing so, we address several key questions: (i) to what extent are mammalian karyotypes polymorphic, and what types of rearrangements are principally involved? (ii) Are some mammalian lineages more prone to chromosomal polymorphism than others? More specifically, do (karyotypically) polymorphic mammalian species belong to lineages that are also characterized by past, extensive karyotype repatterning? (iii) How long can chromosomal polymorphisms persist in mammals? We discuss the evolutionary implications of these questions and propose several research avenues that may shed light on the role of chromosome change in the diversification of mammalian populations and species.

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Section: Rates Of Chromosomal Change Versus Polymorphismmentioning

confidence: 97%

Chromosomal polymorphism in mammals: an evolutionary perspective

2015

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“…But cytogenetic studies have shown that animals with similar morphology may be entirely different in chromosomal characteristics. In their survey of the karyological characteristics of the cotton rats (genus Sigmodon) , Zimmerman and Lee (1968) found that S. hispidus has a diploid number of 52 in all Southeastern and South Central United States, but in Arizona the animals has a diploid number of22. Such a difference, analogous to that between the two muntjacs, suggests that the two forms of S. hispidus are genetically so distant from each other that they could not possibly be one species despite their morphological similarity.…”

Section: Chromosomes and Mammalian Phylogenymentioning

confidence: 99%

Human and Mammalian Cytogenetics

Hsu

1979

Heidelberg Science Library

101

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“…Other Paleartic cricetines have 2n = 22 chromosomes (C.griseus, C.migratorius, C.cricetus), and numbers of 2n=26 and 2n=28 are found among various species of the same group (Yerganian, 1958;Matthey, 1961;Yerganian and Papgyan, 1964;V orgntzcv et al, 1967). The lowest number for a New World cricetine other than the Venezuelan vole mouse is 2n=22, as reported for a marginal population supposedly of Sigmodon hispidus (Zimmerman and Lee, 1968).…”

Section: Discussionmentioning

confidence: 88%

The idiogram of the Venezuelan vole mouse, <i>Akodon urichi venezuelensis</i> Allen (Rodentia, Cricetidae)

Reig¹,

Olivo²,

Kiblisky³

1971

Cytogenet Genome Res

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The Venezuelan vole mouse, Akodon urichi venezuelensis, is a small South American cricetid which can be reared in the laboratory. Their somatic chromosomes have been morphologically and statistically investigated. The chromosome number is 2n = 18. The eight pairs of autosomes are metacentric; four pairs are similar in size and arm ratio, but the others are easy to identify. In males there is an XY sex-chromosome pair; the X is a submetacentric and duplicate type. Polymorphism has been found in the small-sized Y chromosome; in two out of six individuals it was an acrocentric and in the remaining four, a fully telocentric chromosome. In the females, the two X chromosomes are slightly heteromorphic; there is an X! quite similar to the male X chromosome and a longer X₂, which differs also from the X₁ in arm ratio. The risk of reversals of order in similar chromosomes is discussed.

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Variation in chromosomes of the cotton rat, Sigmodon hispidus

Cited by 18 publications

References 15 publications

Chromosomal polymorphism in mammals: an evolutionary perspective

Chromosomal polymorphism in mammals: an evolutionary perspective

Human and Mammalian Cytogenetics

The idiogram of the Venezuelan vole mouse, <i>Akodon urichi venezuelensis</i> Allen (Rodentia, Cricetidae)

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