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

• Published in: Heredity Vol. 79 ( Pt 2); no. 2; pp. 172 - 177
• Main Authors: Polyakov, A V, Chadova, N B, Rodionova, M I, Panov, V V, Dobrotvorsky, A K, Searle, J B, Borodin, P M
• Format: Journal Article
• Language: English
• Published: England 01-08-1997
• Subjects: Animals; Gene Frequency; Polymorphism, Genetic; Population Dynamics; Shrews - genetics; Siberia; Sorex araneus; Siberia; Russia, Novosibirsk
• ISSN: 0018-067X; 1365-2540
• DOI: 10.1038/hdy.1997.140

A Robertsonian fusion polymorphism in the common shrew (Sorex araneus L.), first described in Academgorodok near Novosibirsk (western Siberia) in 1970-72, was re-examined in 1994-95. The polymorphism in the 1970s involved chromosome arm combinations go, jl, mp and qr, i.e. each of these combinations was present in both a metacentric and a twin-acrocentric state in the population at that time. The twin-acrocentric morph for go occurred at low frequency in 1970-72 and was not observed in 1994-95. The polymorphism for arm combinations jl, mp and qr was still observed in 1994-95 and there was no significant difference in metacentric/twin-acrocentric frequencies compared with the previous sample. This is the third well-documented example in which the chromosome polymorphism in the common shrew has been found to be unchanged over a period of 20+ years. Although the polymorphism for qr may be associated with a chromosomal hybrid zone with a cline centre 200 km away, there is no definitive explanation for the other polymorphisms.