Meiotic studies of male common shrews (Sorex araneus L.) from a hybrid zone between chromosome races

2002 ◽  
Vol 96 (1-4) ◽  
pp. 40-44 ◽  
Author(s):  
A. Banaszek ◽  
S. Fedyk ◽  
U. Fiedorczuk ◽  
K.A. Szałaj ◽  
W. Chetnicki
Keyword(s):  
Hybrid Zone ◽  
Sorex Araneus ◽  
Chromosome Races

scholarly journals A microsatellite study in the Łęgucki Młyn/Popielno hybrid zone reveals no genetic differentiation between two chromosome races of the common shrew (Sorex araneus)

2011 ◽  
Vol 56 (2) ◽  
pp. 117-122 ◽  
Author(s):  
Magdalena Moska ◽  
Heliodor Wierzbicki ◽  
Anna Macierzyńska ◽  
Tomasz Strzała ◽  
Robert Maślak ◽  
...  
Keyword(s):  
Genetic Differentiation ◽  
Hybrid Zone ◽  
Common Shrew ◽  
Sorex Araneus ◽  
Chromosome Races ◽  
The Common ◽  
Common Shrew Sorex Araneus

scholarly journals Chromosome pairing and recombination in male hybrids between two chromosome races of the common shrew (Sorex araneus L., Soricidae, Eulipotyphla)

2017 ◽  
Author(s):  
Nadezhda M. Belonogova ◽  
Andrei V. Polyakov ◽  
Tatyana V. Karamysheva ◽  
Anna A. Torgasheva ◽  
Jeremy B. Searle ◽  
...  
Keyword(s):  
Hybrid Zone ◽  
Chromosome Pairing ◽  
Common Shrew ◽  
Low Frequency ◽  
Sorex Araneus ◽  
Strong Suppression ◽  
Chromosome Races ◽  
The Common ◽  
Robertsonian Fusions ◽  
Long Chains

The hybrid zone between chromosome races of the common shrew (Sorex araneus) provides an exceptional model 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. 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.

A Hybrid Zone Between Two Chromosome Races of the Common Shrew, Sorex Araneus, in Eastern Poland: Preliminary Results

Hereditas ◽  
2004 ◽  
Vol 125 (2-3) ◽  
pp. 169-176 ◽  
Author(s):  
Katarzyna A. Szalaj ◽  
Stanislaw Fedyk ◽  
Agata Banaszek ◽  
Wlodzimierz Chftnicki ◽  
Miroslaw Ratkiewicz
Keyword(s):  
Hybrid Zone ◽  
Common Shrew ◽  
Sorex Araneus ◽  
Preliminary Results ◽  
Chromosome Races ◽  
The Common ◽  
Common Shrew Sorex Araneus

scholarly journals Chromosome Synapsis and Recombination in Male Hybrids Between Two Chromosome Races of the Common Shrew (Sorex araneus L., Soricidae, Eulipotyphla)

2018 ◽  
Author(s):  
Nadezhda M. Belonogova ◽  
Andrei V. Polyakov ◽  
Tatyana V. Karamysheva ◽  
Anna A. Torgasheva ◽  
Jeremy B. Searle ◽  
...  
Keyword(s):  
Hybrid Zone ◽  
Common Shrew ◽  
Low Frequency ◽  
Sorex Araneus ◽  
Strong Suppression ◽  
Chromosome Races ◽  
The Common ◽  
Robertsonian Fusions ◽  
Monobrachial Homology ◽  
Long Chains

The hybrid zone between chromosome races of the common shrew (Sorex araneus) provides an exceptional model 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. 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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