Tandemly repeated hexanucleotide at Tetrahymena rDNA free end is generated from a single copy during development.

Abstract:

:The linear extrachromosomal ribosomal DNA of Tetrahymena is generated from a single integrated copy during macronuclear development. The free ends of this extrachromosomal gene contain 20-70 tandem repeats of the hexanucleotide CCCCAA. We have determined the nucleotide sequence at the same (3') end of the single, integrated micronuclear gene. In contrast to the extrachromosomal gene, only a single CCCCAA sequence was found at this position. The same result was obtained from two independently isolated DNA clones, and was therefore not likely an artifact of cloning. Comparisons of the genomic DNA with the cloned fragment by Southern hybridization also supported this argument. Thus the tandemly repetitive hexanucleotide at the free ends of the extrachromosomal rDNA is not an inherited feature, and must be generated during the development of the macronucleus.

journal_name

Cell

journal_title

Cell

authors

King BO,Yao MC

doi

10.1016/0092-8674(82)90417-2

subject

Has Abstract

pub_date

1982-11-01 00:00:00

pages

177-82

issue

1

eissn

0092-8674

issn

1097-4172

pii

0092-8674(82)90417-2

journal_volume

31

pub_type

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