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- Title
The role of chromosome rearrangements in the evolution of mole voles of the genus Ellobius (Rodentia, Mammalia).
- Authors
Bakloushinskaya, I. Yu.; Romanenko, S. A.; Graphodatsky, A. S.; Matveevsky, S. N.; Lyapunova, E. A.; Kolomiets, O. L.
- Abstract
Modern mole voles of the genus Ellobius are characterized by species-specific features of autosomes and sex chromosomes. Owing to the use of the Zoo-FISH method, the nomenclature of chromosomes was refined and nonhomologous Robertsonian translocations indistinguishable by G-staining were identified for Ellobius tancrei, which is a species with a wide chromosome variation of the Robertsonian type. The electron-microscopic analysis of synaptonemal complexes in F hybrids of forms with 2 n = 50 and 2 n = 48 revealed the formation of a closed SC-pentavalent composed of three metacentrics with monobrachial homology and two acrocentrics. Segregation of chromosomes of such complex systems is impeded by disturbances in the nucleus architecture leading to the formation of unbalanced gametes and to a dramatic reduction in fertility of hybrids. Our data support the hypothesis that the formation of monobrachial homologous metacentric chromosomes can be considered as a way of chromosomal speciation.
- Subjects
CHROMOSOMES; MURIDAE; SEX chromosomes; GENETICS; CROSSING over (Genetics)
- Publication
Russian Journal of Genetics, 2010, Vol 46, Issue 9, p1143
- ISSN
1022-7954
- Publication type
Academic Journal
- DOI
10.1134/S1022795410090346