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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