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Copyright 0 1990by the Genetics Society of America The Structure, Distribution and Evolutionof the Tal Retrotransposable
 

Summary: Copyright 0 1990by the Genetics Society of America
The Structure, Distribution and Evolutionof the Tal Retrotransposable
Element Familyof Arabidopsis thaliana
Daniel F. Voytas,* Andrzej Konieczny,* Michael P. Cummingst and Frederick M. Ausubel*
*Department of Genetics, Haward Medical School and Departmentof Molecular Biology, Massachusetts General Hospital, Boston,
Massachusetts 02114, and tMuseum of Comparative Zoology, Harvard University, Cambridge,Massachusetts 02138
Manuscript received May 7, 1990
Accepted for publicationJuly 21, 1990
ABSTRACT
The Tal elementsare a low copynumber,copia-like retrotransposableelement family of Arabidopsis
thaliana. Six Tal insertionscomprise all of the Tal elementcopiesfound in three geographically
diverseA. thaliana races. These six elements occupy three distinct target sites: Tal-1 is located on
chromosome5 and is common to all three races (Col-0,Kas-1 and La-0).TaI-2 is present in two races
on chromosome 4 (Kas-1 and La-0), andTaI-3, also located on chromosome4, is present only in one
race (La-0).The six Tal insertions share>96% nucleotide identity,yet are likely to be incapable of
further transposition due to deletions or nucleotide changesthat alter either the coding capacity of
the elements or conservedproteindomainsrequired for retrotransposition.Nucleotidesequence
comparisonsof these elements and the distributionof Tal among 12 additionalA. thalianageograph-
icalracessuggest that Tal-I predated the globaldispersal of A. thaliana. As the speciesspread
throughout the world,two additional transposition events occurredwhich gave risefirst to TaI-2and

  

Source: Ausubel, Frederick M. - Department of Genetics, Harvard University

 

Collections: Biology and Medicine