The chromosome complement of Sorex granarius–the ancestral karyotype of the common shrew (Sorex araneus)?

Wójcik, Jan M.; Searle, Jeremy B.

doi:10.1038/hdy.1988.109

Cited by 53 publications

(31 citation statements)

References 17 publications

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“…It is generally assumed that the ancestral karyotype of the common shrew consisted of acrocentric chromosomes and that all metacentrics were formed by Robertsonian fusion mutations (Searle 1984). This hypothesis is supported by comparisons with other species of Sorex (Meylan and Hausser 1973, Wójcik and Searle 1988, Volobouev and Catzeflis 1989). An alternative hypothesis is that the observed metacentrics were formed either by Robertsonian fusions of acrocentrics, or by whole-arm reciprocal translocations between different metacentrics (Halkka at al.…”

Section: Relationships Between Polish and Other European Racessupporting

confidence: 59%

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Chromosome races of the common shrew Sorex araneus in Poland: a model of karyotype evolution

Wójcik¹

1993

Acta Theriol.

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Section: Relationships Between Polish and Other European Racessupporting

confidence: 59%

“…An unusually extensive Robertsonian variability has been found in this species. It is assumed that the main mutations involved in karyotypic variation in the common shrew are centric fuskns (Searle 1984, Wójcik and Searle 1988, Volobouev and Catzeflis 1989, Zima 1991.…”

Section: Introductionmentioning

confidence: 99%

Chromosome races of the common shrew Sorex araneus in Poland: a model of karyotype evolution

Wójcik¹

1993

Acta Theriol.

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“…The genome-wide chromosomal correspondence among the three taxa studied here is well established (e.g., Volobouev 1989, Volobouev & Catzeflis 1989. The first taxon is S. granarius, a species genetically very similar to S. araneus (Fumagalli et al 1999), which is believed to have retained the ancestral karyotype of the S. araneus group (Wójcik & Searle 1988, Volobouev 1989. Indeed, all its autosomes (except the smallest one tu) are in an acrocentric state.…”

Section: Introductionmentioning

confidence: 93%

Chromosome localization of microsatellite markers in the shrews of the Sorex araneus group

et al. 2006

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The extremely high rate of karyotypic evolution that characterizes the shrews of the Sorex araneus group makes this group an exceptionally interesting model for population genetics and evolutionary studies. Here, we attempted to map 46 microsatellite markers at the chromosome arm level using flow-sorted chromosomes from three karyotypically different taxa of the Sorex araneus group (S. granarius and the chromosome races Cordon and Novosibirsk of S. araneus). The most likely localizations were provided for 35 markers, among which 25 were each unambiguously mapped to a single locus on the corresponding chromosomes in the three taxa, covering the three sexual chromosomes (XY1Y2) and nine of the 18 autosomal arms of the S. araneus group. The results provide further evidence for a high degree of conservation in genome organization in the S. araneus group despite the presence of numerous Robertsonian rearrangements. These markers can therefore be used to compare the genetic structure among taxa of the S. araneus group at the chromosome level and to study the role of chromosomal rearrangements in the genetic diversification and speciation process of this group.

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“…The diploid chromosome number (2n) varies from 20 to 33, with the number of autosomal arms the same all over the species range (FNa = 40). It has been suggested that the ancestral karyotype of the common shrew consisted mostly of uniarmed (acrocentric) chromosomes [7]. The consecutive fixation of various centric or Robertsonian fusions (Rbs) and whole-arm reciprocal translocations (WARTs) gave rise a wide variety of combinations of biarmed (metacentric) and acrocentric chromosomes in extant chromosome races.…”

Section: Introductionmentioning

confidence: 99%

Chromosome Synapsis and Recombination in Male Hybrids Between Two Chromosome Races of the Common Shrew (<em>Sorex araneus</em> L., Soricidae, Eulipotyphla)

Belonogova

Polyakov

Карамышева

et al. 2018

Preprint

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Abstract:Hybrid zones between chromosome races of the common shrew (Sorex araneus) provide exceptional models to study the potential role of chromosome rearrangements in the initial steps of speciation. The Novosibirsk and Tomsk races differ by a series of Robertsonian fusions with monobrachial homology. They form a narrow hybrid zone and generate hybrids with both simple (chain of three chromosomes) and complex (chain of eight or nine) synaptic configurations. Using immunolocalisation of the meiotic proteins, we examined chromosome pairing and recombination in males from the hybrid zone. Homozygotes and simple heterozygotes for Robertsonian fusions showed a low frequency of synaptic aberrations (< 10%). The carriers of complex synaptic configurations showed multiple pairing abnormalities, which might lead to reduced fertility. The recombination frequency in the proximal regions of most chromosomes of all karyotypes was much lower than in the other regions. The strong suppression of recombination in the pericentromeric regions and co-segregation of race specific chromosomes involved in the long chains would be expected to lead to linkage disequilibrium between genes located there. Genic differentiation, together with the high frequency of pairing aberrations in male carriers of the long chains, might contribute to maintenance of the narrow hybrid zone.

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The chromosome complement of Sorex granarius–the ancestral karyotype of the common shrew (Sorex araneus)?

Cited by 53 publications

References 17 publications

Chromosome races of the common shrew Sorex araneus in Poland: a model of karyotype evolution

Chromosome races of the common shrew Sorex araneus in Poland: a model of karyotype evolution

Chromosome localization of microsatellite markers in the shrews of the Sorex araneus group

Chromosome Synapsis and Recombination in Male Hybrids Between Two Chromosome Races of the Common Shrew (<em>Sorex araneus</em> L., Soricidae, Eulipotyphla)

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