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Nucleic Acids Research, 1981, Vol. 9, No. 20 5311-5330
© 1981

MOLECULAR BIOLOGY

Sequence organization of the spacer in the ribosomal genes of Xenopus clivii and Xenopus borealis

René Bach1,*, Bernard Allet2,** and Marco Crippa1,***

1Département de Biologie animale, Université de Genève, Ecole de Médecine, rue de l'Ecole de Médecine 20 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland 2Département de Biologie moleculaire, Université de Genève 30, quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland

***to whom correspondence should be addressed

Received July 6, 1981.

We have studied in X.clivii and X.borealis cloned EcoRI fragments containing the spacer located between the 28S and 18s ribosomal genes. We report for these two species the nucleotide sequences at both ends of the NTS region with special emphasis on the sequences around the transcription initiation site of the 40C rRNA precursor. In X.clivii the location of the 5' end of the precursor was mapped. In both species the sequences around the 40S origin are duplicated in the NTS. Nucleotide sequence comparison has revealed a stretch of 13 identical bases around the transcription initiation site of X. laevis and X.clivii. The same sequence is also present at the presumptive transcription initiation site of X.borealis rDNA.

*Present address: Department of computer sciences, stanford University stanford, california, U.S.A.

**Present address: Biogène S.A., 3, route de Troinex, carouge, Genève


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