Restriction Endonuclease Analysis of Ribosomal DNA from Saccharomyces Cerevisiae

Overview

Journal Mol Gen Genet

Specialties Genetics
Molecular Biology

Date 1976 Nov 17

PMID 796660

Citations 30

Authors

J H Cramer

F W Farrelly

R H Rownd

Affiliations

Soon will be listed here.

Abstract

The size and degree of homogeneity of the repetitive units in purified ribosomal DNA (gamma DNA) from Saccharomyces cerevisiae have been analyzed by restriction endonuclease digestion and heteroduplex mapping. Digestion of the gamma DNA with EcoRI yields seven fragments, digestion with Hind II+III yields five fragments, digestion with Hind III alone yields two fragments, and digestion with Sma I yields one fragment. The sum of the fragment molecular weights after digestion with each of the endonucleases is 5.5-5.6 x 10(6). When the DNA strands of the Sma I fragment are dissociated and reannealed, only homoduplexes are formed. We have concluded from these results that the repeating units in yeast ribosomal DNA are 5.6 x 10(6) datons and are homogeneous in size and composition.

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