Cytoplasmically Inherited Female-biased Sex Ratio
in Kyrgyz Population of Adalia bipunctata turanica
Caused by Bacteria of the Genus Rickettsia

I. A. Zakharov1, I. I. Goryacheva1, E. B. Rydkina2, V. Roux3, and D. Raoult3

1 Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, 117809 Russia; fax: (095) 135-12-89
2 Gamaleya Research Institute of Epidemiology and Microbiology, Russian Academy of Medical Sciences,
Moscow, 123098 Russia
3 Unité des Rickettsies, Centre National de la Recherche Scientifique, Faculté de Medicine, Marseille, Cedex 5, France

Received December 23, 1996; in final form, June 10, 1997

Abstract—In the studies on the Kyrgyz population of the two-spot ladybird Adalia bipunctata turanica, some
individuals producing exclusively or predominantly female progeny were found. The female-biased sex ratio
was preserved in five studied generations, and it was maternally inherited. DNA analysis by means of PCR fol-
lowed by the sequencing of amplification products allowed us to conclude that bacteria causing the female-
biased sex ratio in A. b. turanica belong to the genus Rickettsia.

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