Germline-restricted chromosome (GRC) in the sand martin and the pale martin (Hirundinidae, Aves): synapsis, recombination and copy number variation.

Autor: Malinovskaya LP; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia.; Novosibirsk State University, Novosibirsk, 630090, Russia., Zadesenets KS; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia., Karamysheva TV; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia., Akberdina EA; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia., Kizilova EA; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia.; Novosibirsk State University, Novosibirsk, 630090, Russia., Romanenko MV; Novosibirsk State University, Novosibirsk, 630090, Russia., Shnaider EP; SibEcoCenter LLC, Novosibirsk, 630009, Russia., Scherbakova MM; Tomsk State University, Tomsk, 634050, Russia., Korobitsyn IG; Tomsk State University, Tomsk, 634050, Russia., Rubtsov NB; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia.; Novosibirsk State University, Novosibirsk, 630090, Russia., Borodin PM; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia.; Novosibirsk State University, Novosibirsk, 630090, Russia., Torgasheva AA; Institute of Cytology and Genetics, Russian Academy of Sciences, Siberian Department, 630090, Novosibirsk, Russia. torgasheva@bionet.nsc.ru.; Novosibirsk State University, Novosibirsk, 630090, Russia. torgasheva@bionet.nsc.ru.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2020 Jan 23; Vol. 10 (1), pp. 1058. Date of Electronic Publication: 2020 Jan 23.
DOI: 10.1038/s41598-020-58032-4
Abstrakt: All songbirds studied to date have an additional Germline Restricted Chromosome (GRC), which is not present in somatic cells. GRCs show a wide variation in genetic content and little homology between species. To check how this divergence affected the meiotic behavior of the GRC, we examined synapsis, recombination and copy number variation for GRCs in the closely related sand and pale martins (Riparia riparia and R. diluta) in comparison with distantly related estrildid finches. Using immunolocalization of meiotic proteins and FISH with GRC-specific DNA probes, we found a striking similarity in the meiotic behavior of GRCs between martins and estrildid finches despite the millions of years of independent evolution. GRCs are usually present in two copies in female and in one copy in male pachytene cells. However, we detected polymorphism in female and mosaicism in male martins for the number of GRCs. In martin and zebra finch females, two GRCs synapse along their whole length, but recombine predominately at their ends. We suggest that the shared features of the meiotic behavior of GRCs have been supported by natural selection in favor of a preferential segregation of GRCs to the eggs.
Databáze: MEDLINE
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