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Nucleic Acids Research, 1988, Vol. 16, No. 16 7827-7832
© 1988

Articles

Variable rRNA gene copies in extreme halobacteria

J.L. Sanz, I. Marín, L. Ramirez, J.P. Abad1, C.L. Smith2 and R. Amils1

Centro de Biologí Molecular, UAM, Cantoblanco 28049 Madrid, Spain 1Department of Genetics and Development College of Physicians and Surgeons, Columbia University New York, NY 10032, USA 2Microbiology and Psychiatry, College of Physicians and Surgeons, Columbia University New York, NY 10032, USA

*To whom correspondence should be addressed

Received June 21, 1988. Accepted July 20, 1988.

Using PFG electrophoresis techniques, we have examined the organization of rRNA gene in halobacterium species. The results show that the organization of rRNA genes among closely related halobacteria is quite heterogeneous. This contrasts with the high degree of conservation of rRNA sequence (1). The possible mechanism of such rRNA gene amplification and its evolutionary implications are discussed.


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