title: Analysis of meiotic chromosome structure and behavior in Robertsonian heterozygotes of Ellobius tancrei (Rodentia, Cricetidae): a case of monobrachial homology.
abstract: Synaptonemal complex (SC) chains were revealed in semisterile intraspecific F1 hybrids of Ellobius tancrei Blasius, 1884 (2n = 49, NF=56 and 2n=50, NF=56), heterozygous for Robertsonian (Rb) translocations. Chains were formed by Rb submetacentrics with monobrachial homology. Chromosome synapsis in spermatocytes of these hybrids was disturbed, apparently because of the problematic release of the chromosomes from the SC chains. These hybrids suffer from low fertility, and our data support the opinion that this is because a formation of Rb metacentrics with monobrachial homology within different races of the same species might be an initial event for the divergence of chromosomal forms.
authors.affiliation: N.I. Vavilov Institute of General Genetics, RAS, 3 Gubkin st., Moscow, 119991, Russia.
authors.forename: Sergey
authors.initials: S
authors.lastname: Matveevsky
authors.affiliation: N.K. Koltzov Institute of Developmental Biology, RAS, 26 Vavilov st., Moscow, 119334, Russia.
authors.forename: Irina
authors.initials: I
authors.lastname: Bakloushinskaya
authors.affiliation: Lomonosov Moscow State University, Leninskiye Gory, 1, Moscow, 119991, Russia.
authors.forename: Valentina
authors.initials: V
authors.lastname: Tambovtseva
authors.affiliation: Institute of Molecular and Cellular Biology, Siberian Branch, RAS, 8/2 Av. Acad. Lavrent'ev, Novosibirsk, 630090, Russia; Novosibirsk State University, 2 Pirogov st., Novosibirsk, 630090, Russia.
authors.forename: Svetlana
authors.initials: S
authors.lastname: Romanenko
authors.affiliation: N.I. Vavilov Institute of General Genetics, RAS, 3 Gubkin st., Moscow, 119991, Russia.
authors.forename: Oxana
authors.initials: O
authors.lastname: Kolomiets
keywords: Meiosis; SC multivalent; fertility; hybrid; synaptonemal complex