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Nucleic Acids Research, 1979, Vol. 7, No. 1 69-76
© 1979

Articles

Extrachromosomal circular ribosomal DNA in the yeast Saccharomyces carlsbergensis

Jan H. Meyerink, Jacobus Klootwijk, Rudi J. Planta, Arie van der Ende and Ernst F.J. van Bruggen

Biochemisch Laboratorium, Vrije Universiteit de Boelelaan 1085, 1081 HV Amsterdam-Buitenveldert, The Netherlands Biochemisch Laboratorium, Rijksuniversiteit Groningen Nijenborgh 16, 9747 AG Groningen, The Netherlands

Received July 3, 1979. Purified ribosomal DNA from Saccharomyces carlsbergensis contains a small proportion of circular DNA molecules with a contour length of 3 um or integral multiples thereof. Hybridization of yeast ribosomal DNA with 26 S rRNA, using the R-loop technique, reveals that these circular molecules contain sequences complementary to yeast ribosomal RNA. We suggest that these extrachromosomal rRNA genes may be intermediates in the amplification of rRNA genes in yeast.


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