Novosibirsk revisited 24 years on: chromosome polymorphism in the Novosibirsk population of the common shrew Sorex araneus L.

Polyakov, Andrey; CHADOVA, NINA B; Rodionova, M. I.; Panov, Victor V.; DOBROTVORSKY, ANDREI K; Searle, Jeremy B.; Borodin, Pavel M.

doi:10.1038/sj.hdy.6881710

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Shrews were trapped over 1998–2006 by home‐made live‐traps (Shchipanov, 1986) and pitfalls. Chromosomal data from previous studies of the Novosibirsk and Tomsk races (Kral & Radjabli, 1974; Polyakov et al. , 1996, 1997, 2003) were also used in the analyses.…”

Section: Methodsmentioning

confidence: 99%

Natural hybridization between extremely divergent chromosomal races of the common shrew (Sorex araneus, Soricidae, Soricomorpha): hybrid zone in Siberia

Polyakov¹,

White²,

Jones³

et al. 2011

J of Evolutionary Biology

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Chromosomal races of the common shrew differ in sets of metacentric chromosomes and on contact may produce hybrids with extraordinarily complex configurations at meiosis I that are associated with reduced fertility. There is an expectation that these may be some of the most extreme tension zones available for study and therefore are of interest as potential sites for reproductive isolation. Here, we analyse one of these zones, between the Novosibirsk race (characterized by metacentrics go, hn, ik, jl, mp and qr) and the Tomsk race (metacentrics gk, hi, jl and mn and acrocentrics o, p, q and r), which form hybrids with a chain‐of‐nine (CIX) and a chain‐of‐three (CIII) configuration at meiosis I. At the Novosibirsk–Tomsk hybrid zone, the CIX chromosomes form clines of 8.53 km standardized width on average, whereas the cline for the CIII chromosomes was 52.83 km wide. The difference in these cline widths fits with the difference in meiotic errors expected with the CIX and CIII configuration, and we produce estimates of selection against hybrids with these types of configurations, which we relate to dispersal and age of the hybrid zone. The hybrid zone is located at the isocline at 200 m altitude above sea level; this relationship between the races and altitude is suggested at both coarse and fine scales. This indicates adaptive differences between the races that may in turn have been promoted by the chromosome differences. Thus, the extreme chromosomal divergence between the Novosibirsk and Tomsk may be associated with genic differentiation, but it is still striking that, despite the large chromosomal differences, reproductive isolation between the Novosibirsk and Tomsk races has not occurred.

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Section: Methodsmentioning

confidence: 99%

Natural hybridization between extremely divergent chromosomal races of the common shrew (Sorex araneus, Soricidae, Soricomorpha): hybrid zone in Siberia

Polyakov¹,

White²,

Jones³

et al. 2011

J of Evolutionary Biology

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“…Some rare diachronic studies have shown that some karyotypic variations may remain stable (in both frequency and type of mutation) at least within the period of the short‐term surveys conducted (e.g. at least 20 generations in Holochilus braziliensis : Nachman & Myers, ; 24 years, corresponding to >24 generations, in Sorex araneus : Polyakov et al ., ). However, when one is interested in longer periods, data are surprisingly few.…”

Section: The Persistence Of Chromosomal Polymorphisms In Mammalsmentioning

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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“…With few exceptions, all the temporal analyses concentrate on the morphological characters of the hybridizing taxa, owing to the scarcity of genetic data in the literature. In fact, only taxa with a long history of genetic studies can be used ( Polyakov et al ., 1997 ). One of these is the house mouse Mus musculus domesticus , which has been the subject of cytogenetic studies since the 1960s ( Gropp et al ., 1969 ; Capanna et al ., 1976 ); its high chromosomal variability leads to a large number of chromosomal races with a diploid number ranging from 2 n = 40, all telocentric chromosomes, to 2 n = 22 with nine Robertsonian (Rb) fusions.…”

Section: Introductionmentioning

confidence: 99%

Contact zones between chromosomal races of Mus musculus domesticus. 1. Temporal analysis of a hybrid zone between the CD chromosomal race (2n=22) and populations with the standard karyotype

Castiglia

Capanna

1999

Heredity

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A temporal analysis of a hybrid zone between chromosomal races of Mus musculus domesticus was performed to evaluate its dynamics over a 20-year period. The transect chosen was one previously analysed by Spirito et al. (1980) across the hybrid zone between the chromosomal race CD 2n 22 (central Italy) and the surrounding populations with standard karyotype (2n 40). The results show that 20 years of hybridization have not had any signi®cant e ect on the position of this hybrid zone, nor on the location of its extreme margin, except for one site for which passive transport of mice may have been important. The absence of a signi®cant shift of the tension zone excludes a possible imbalance between the two cytotypes; a ®tness superiority of one homozygote greater than 0.01 would have produced an appreciable shift of the zone. The internal chromosomal structure of the zone shows a constant gradual increase in metacentric chromosome frequency towards the localities nearest the area inhabited by the 22-CD homozygote population. This contrasts with the previously reported data which indicated an irregular trend, particularly evident for the Rb(3.8), Rb(5.17) and Rb(6.13) chromosomes. For each Rb metacentric, we observed greater values of F ST in the past sample than in the present one. These di erences reveal a tendency towards the homogenization of adjacent populations, perhaps because of greater migration between adjacent demes resulting from increased commercial tra c. The Mantel test was performed for both temporal samples. A positive correlation between the geographical and chromosomal di erentiation was demonstrated.

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Novosibirsk revisited 24 years on: chromosome polymorphism in the Novosibirsk population of the common shrew Sorex araneus L.

Cited by 4 publications

References 4 publications

Natural hybridization between extremely divergent chromosomal races of the common shrew (Sorex araneus, Soricidae, Soricomorpha): hybrid zone in Siberia

Natural hybridization between extremely divergent chromosomal races of the common shrew (Sorex araneus, Soricidae, Soricomorpha): hybrid zone in Siberia

Chromosomal polymorphism in mammals: an evolutionary perspective

Contact zones between chromosomal races of Mus musculus domesticus. 1. Temporal analysis of a hybrid zone between the CD chromosomal race (2n=22) and populations with the standard karyotype

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