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. 1990 Dec;9(12):3989–3996. doi: 10.1002/j.1460-2075.1990.tb07620.x

Functional analysis of transcribed spacers of yeast ribosomal DNA.

W Musters 1, K Boon 1, C A van der Sande 1, H van Heerikhuizen 1, R J Planta 1
PMCID: PMC552171  PMID: 2249660

Abstract

Making use of an rDNA unit, containing oligonucleotide tags in both the 17S and 26S rRNA gene, we have analyzed the effect of various deletions in the External Transcribed Spacer (ETS) and in one of the Internal Transcribed Spacers 1 (ITS1) on the process of ribosome formation in yeast. By following the fate of the tagged transcripts of this rDNA unit in vivo by Northern hybridization we found that deleting various parts of the ETS prevents the accumulation of tagged 17S rRNA and its assembly into 40S subunits, but not the formation of 60S subunits. Deleting the central region of ITS1, including a processing site that is used in an early stage of the maturation process, was also found to prevent the accumulation of functional 49 S subunits, whereas no effect on the formation of 60S subunits was detected. The implications of these findings for yeast pre-rRNA processing are discussed.

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