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Nucleic Acids Research, 1983, Vol. 11, No. 14 4939-4946
© 1983

MOLECULAR BIOLOGY

Strong sequence conservation of a 38 bp region near the center of the extrachromosomal rDNA palindrome in different Tetrahymena species

J. Engberg

Department of Biochemistry B, The Panum Institute, University of Copenhagen Blegdamsvej 3, DK-2200 Copenhagen N, Denmark

Received May 18, 1983. Revised June 30, 1983. Accepted June 30, 1983.

The restriction-endonuclease map and the nucleotide sequence of the central region in the extrachromosomal rDNA palindrome of two micronuclear and one a-micronucleate species of Tetrahymena has been determined. The sequence data show that the different species investigated have a 24 or 26 nucleotide sequence region at the very center of the rDNA molecule which is non-palindromic. Comparison of the present sequence data with the published data of another micronucleate species reveal that a segment of 38 base pairs just outside the non-palindromic center is highly conserved in all the different species, while the rest of the central region show little sequence homology. The relevance of this conserved region to the amplification process of the rDNA molecule is discussed.


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