Chromosomal Differentiation in the Common Shrew and Related Species

Bulatova, N. Sh.; Biltueva, Larisa S.; Pavlova, Svetlana V.; Жданова, Н. С.; Zima, Jan

doi:10.1017/9780511895531.006

Cited by 18 publications

(37 citation statements)

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“…The common shrew is a species with exceptional chromosomal polymorphism, which forms at least 76 chromosomal races in its range [1]. In the contact zones of the ranges of races, owing to the balance between the dispersal of individuals and the selection against heterozygotes (interracial hybrids), tension hybrid zones are formed [2].…”

Section: Introductionmentioning

confidence: 99%

Spatial Population Genetic Structuring of the Common Shrew Sorex araneus (Lipotyphla, Mammalia): Variability of Microsatellite Markers

et al. 2020

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Variability of five microsatellite loci was studied in the common shrew S. araneus belonging to the Moscow chromosomal race. Three local samples (n = 39) from the sites situated at a minimum distance from each other (350-700 m) were examined. The studied samples were characterized by high allelic diversity along with considerable genetic differentiation of the population. Pairwise comparisons revealed statistically significant difference between the samples, with the highest genetic differences observed at a minimum geographic distance. To explain the causes of the population genetic heterogeneity, analysis of the population demographic patterns at the sampling sites and neighboring areas was carried out. The data obtained were consistent with the models of Altukhov's population system.

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Section: Introductionmentioning

confidence: 99%

Spatial Population Genetic Structuring of the Common Shrew Sorex araneus (Lipotyphla, Mammalia): Variability of Microsatellite Markers

et al. 2020

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“…Chapter 5 of this book presents the list of chromosomal races discovered over the whole vast species range of S. araneus . As generally, geographic names of 76 chromosomal races were listed in an alphabetical order, accompanied with the diagnostic chromosomal formulas ( Bulatova et al 2019 ). G-band nomenclature was used for the chromosome identification ( Searle et al 1991 ) and chromosomal races were defined prioritizing the karyotypic and geographic separation adhering to the ISACC rules (Hausser et al 1994).…”

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“…Ten other chromosome arms ( g to r , except j , l ) are fused in a variety of combinations which show the remarkable intraspecies polytypic variation. Such arm reshuffling creates a variety of chromosomal races: 37 different combinations of chromosomal arms fused into metacentrics were detected in 76 described chromosomal races (see tables 5.2 and 5.3 in: Bulatova et al 2019 ). So, here the set of chromosomes/arms in karyotypes of the S. araneus is represented in symbols of the standard nomenclature in Latin letters with variable chromosomes being marked with an asterisk:…”

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“…To analyse the peculiarities of the variable group of chromosome arms, the list of the synoptic table 5.3 from Bulatova et al (2019) was restructured to follow each chromosome variation in Table 1 here. The acrocentric state and fusion variants were labelled with one and two letters, correspondingly, revealing thus all defined series.…”

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“…Subsequent fusions between initially formed acrocentrics shaped two characteristic metacentrics of the S. araneus karyotype – jl and bc ( Biltueva et al 2011 ). The fusion jl is species specific apomorphy, while bc is a common fusion for the clade consisting of three sibling species, S. araneus , S. satunini , S. antinorii Bonaparte, 1840 (reviewed by Bulatova et al 2019 ). The variants of combination of 10 acrocentrics into 1 to 5 permissible race specific metacentrics are multiplied in series of further fusion combinations of every monobrachial homolog (for instance, gm with hi , hk , hn – hi with ko , kp , kq , kr – ko with nr , np , nq ; and so on).…”

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Notable homologous variation in chromosomal races of the common shrew

Bulatova¹

2020

CCG

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This paper is a review of the rare phenomenon of chromosome intraspecies variation manifested in monobrachial homology series in the comprehensively investigated karyotype of the common shrew Sorex araneus Linnaeus, 1758 (Eulipotyphla, Mammalia). The detailed dataset on the account of this mammalian species was drawn from the recently published monograph by Searle et al. (2019) “Shrews, Chromosomes and Speciation”. The parallels to the law of homologous series in variation by Nikolai Vavilov are discussed.

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Natural male hybrid common shrews with a very long chromosomal multivalent at meiosis appear not to be completely sterile

Matveevsky,

Kolomiets,

Shchipanov

et al. 2023

J Exp Zool Pt B

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Among 36 known chromosomal hybrid zones of the common shrew Sorex araneus, the Moscow–Seliger hybrid zone is of special interest because inter‐racial complex heterozygotes (F1 hybrids) produce the longest meiotic configuration, consisting of 11 chromosomes with monobrachial homology (undecavalent or chain‐of‐eleven: CXI). Different studies suggest that such a multivalent may negatively affect meiotic progression and in general should significantly reduce fertility of hybrids. In this work, by immunocytochemical and electron microscopy methods, we investigated for the first time chromosome synapsis, recombination and meiotic silencing in pachytene spermatocytes of natural inter‐racial heterozygous shrew males carrying CXI configurations. Despite some abnormalities detected in spermatocytes, such as associations of chromosomes, stretched centromeres, and the absence of recombination nodules in some arms of the multivalent, a large number of morphologically normal spermatozoa were observed. Possible low stringency of pachytene checkpoints may mean that even very long meiotic configurations do not cause complete sterility of such complex inter‐racial heterozygotes.

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Chromosomal Differentiation in the Common Shrew and Related Species

Cited by 18 publications

References 90 publications

Spatial Population Genetic Structuring of the Common Shrew Sorex araneus (Lipotyphla, Mammalia): Variability of Microsatellite Markers

Spatial Population Genetic Structuring of the Common Shrew Sorex araneus (Lipotyphla, Mammalia): Variability of Microsatellite Markers

Notable homologous variation in chromosomal races of the common shrew

Natural male hybrid common shrews with a very long chromosomal multivalent at meiosis appear not to be completely sterile

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