Polymorphisme chromosomique intraspecifique et intraindividuel chez Acomys minous Bate (Mammalia ? Rodentia ? Muridae)

Matthey, R

doi:10.1007/bf00321468

Cited by 37 publications

(21 citation statements)

References 18 publications

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“…This conclusion was in good agreement with the further chromosome banding studies of A. airensis (Viegas-Péquignot et al, 1983) and A. dimidiatus (= A. cahirinus in Zahavi andWahrman, 1956 andMatthey, 1963) (Volobouev et al, 1991). These studies showed that despite the close 2n and NF values, their fusion products involve different chromosome arms, thus displaying monobrachial homology, which is known to provide a strong post-mating isolation (for review see Searle, 1993).…”

Section: Acomys Phylogenysupporting

confidence: 77%

“…For almost 50 years, and except for the rare studies of meiosis in laboratory-obtained hybrids (Zahavi and Wahrman, 1956;Matthey, 1963;Wahrman and Goitein, 1972;Wahrman et al, 1985), mammalian cytotaxonomy has relied on gross karyotypic comparisons to infer degree of reproductive isolation between taxa. However, in instances where the differences among taxa were less marked (at least in terms of gross karyotypic comparisons), the task was more difficult and relationships between forms remained largely unresolved.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of karyotype evolution in complexes of sibling species within three genera of African murid rodents inferred from the comparison of cytogenetic and molecular data

Volobouev

Анискин

Lecompte³

et al. 2002

Cytogenet Genome Res

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Here we report on the analysis of three rodent sibling species complexes belonging to the African genera Arvicanthis, Acomys and Mastomys. Using cytogenetic and molecular approaches we set out to investigate how karyotype and molecular evolution are linked in these muroid sibling species and, in particular, to what extent chromosomal changes are relevant to cladogenic events inferred from molecular data. The study revealed that each complex is characterized by a distinct pattern of karyotype evolution (karyotypic orthoselection), and a specific mutation rate. However we found that the general pattern may be considerably modified in the course of evolution within the same species complex (Arvicanthis, Acomys). This observation suggests that karyotypic orthoselection documented in numerous groups is not so much a reflection of selection of a definite type of chromosomal mutation, as suggested by the classical concept, but is due to genome structure of a given species. In particular, karyotypic change appears related to the quantity and chromosomal location of repeated sequences. The congruence between the chromosomal and molecular data shows that chromosomal changes are often valuable phylogenetic characters (Arvicanthis and Mastomys, but not Acomys). However, most importantly the approach underscores the value of incorporating both in order to gain a better understanding of complex patterns of evolution. Moreover, the fact that every cladogenetic event in Mastomys is supported by two pericentric inversions allowed us to hypothesize that genetic differentiation is initiated by the suppression of recombination within inverted segments, and that the accumulation of multiple pericentric inversions reinforces genetic isolation leading to subsequent speciation. Finally, the low sequence divergences distinguishing karyotypically distinct sibling species within Arvicanthis and Mastomys emphasizes the power of combining cytogenetic and molecular approaches for the characterization of unrecognized components of biodiversity.

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Section: Acomys Phylogenysupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Patterns of karyotype evolution in complexes of sibling species within three genera of African murid rodents inferred from the comparison of cytogenetic and molecular data

Volobouev

Анискин

Lecompte³

et al. 2002

Cytogenet Genome Res

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“…Chu and Bender (1962) and Bender and Chu (1963) assumed that the number of chromosomes in this group of Primates evolved from higher to lower by means of centric fusion mechanisms (Robertsonian type). Similar mechanisms have indeed been demonstrated in other Mammals (Chu and Swomley 1962, Wahrman and Zahavi 1955, Matthey 1963 and are widespread in a number of other organisms. In their hypothesis Chu and Bender (1962) take into consideration the data of Kleinfeld and Chu (1958) on the histophotometric measurement of the DNA which results to be the same in species with 2n=54 and 60 chromosomes .…”

Section: Cercopithecus Nictitanssupporting

confidence: 76%

“…A few indications of this variability are furnished by some authors for other species both primates and rodents (Chu and Swomley 1961in Lemur, Wahrman and Zahavi 1955, Ford et al 1957, Meylan 1961, Matthey 1964. This variability in chromosomes number among individuals belonging to the same species may be explained , in some instances, by as suming their appartenence to different subspecies, but in other instances this explanation can not be applied: in fact some of the individuals examined belong to the same stock of the same Zoological Garden and some morpho logical differences among the specimens ought to have been noticed when the biopsy was taken as for example in C. neglectus .…”

Section: Cercopithecus Nictitansmentioning

confidence: 95%

“…This assertion is neither anatomically nor paleontologically supported (Buettner-Janusch 1963). Moreover Matthey (1964), on the basis of his extensive research on the chromosomes numbers of the Eutherian mammals, reached the conclusion that there is a very low probability that numbers of chromosomes higher than 58 are primitive. 18, reconstructions in pairs of the chromosomes of a female of C. mitis (2n=72), the same of Fig.…”

Section: Cercopithecus Nictitansmentioning

confidence: 99%

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Chromosome Polymorphism in the Species of the Genus <i>Cercopithecus</i>

Chiarelli

1968

CYTOLOGIA

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Cytogenetic studies in the Hottentot population: Count distribution, report of a fragment, and preliminary description of morphology

Heltne

Singer

1971

American J Phys Anthropol

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As part of a general investigation of the biology and morphological variation of the Hottentot population, this study deals with the karyotype analysis of a sample from that population. The modal number overall is 46; however, a high percentage of aneuploid cells, both hypomodal and hypermodal, is found. The rate of increase of aneuploidy with age is considered in detail. The rates for hypomodality with age for Hottentot females are positive and significantly higher than those for other populations previously reported.A fragment of chromatin is described. The fragment occurs in the two Hottentot males and in 22 of the 23 Hottentot females studied. Cells from the one nonsteatopygic female successfully cultured show fragments, as do cells from a Bushman female. In the Hottentots the average incidence of the single anomaly equals or exceeds the incidence of the total of all chromosome lesions in published studies giving control data.Metaphases from five individuals are figured, and several unusual features of the chromosomes are described.The findings are discussed in terms of functional integration at a cytological level, karyotype pictures to be expected in hybridization between demes long isolated, and microevolution of the Hottentot population.

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Polymorphisme chromosomique intraspecifique et intraindividuel chez Acomys minous Bate (Mammalia ? Rodentia ? Muridae)

Cited by 37 publications

References 18 publications

Patterns of karyotype evolution in complexes of sibling species within three genera of African murid rodents inferred from the comparison of cytogenetic and molecular data

Patterns of karyotype evolution in complexes of sibling species within three genera of African murid rodents inferred from the comparison of cytogenetic and molecular data

Chromosome Polymorphism in the Species of the Genus <i>Cercopithecus</i>

Cytogenetic studies in the Hottentot population: Count distribution, report of a fragment, and preliminary description of morphology

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