The Saccharomyces cerevisiae TRT2 tRNAThr gene upstream of STE6 is a barrier to repression in MATalpha cells and exerts a potential tRNA position effect in MATa cells.

Abstract:

:A growing body of evidence suggests that genes transcribed by RNA polymerase III exhibit multiple functions within a chromosome. While the predominant function of these genes is the synthesis of RNA molecules, certain RNA polymerase III genes also function as genomic landmarks. Transfer RNA genes are known to exhibit extra-transcriptional activities such as directing Ty element integration, pausing of replication forks, overriding nucleosome positioning sequences, repressing neighboring genes (tRNA position effect), and acting as a barrier to the spread of repressive chromatin. This study was designed to identify other tRNA loci that may act as barriers to chromatin-mediated repression, and focused on TRT2, a tRNA(Thr) adjacent to the STE6 alpha2 operator. We show that TRT2 acts as a barrier to repression, protecting the upstream CBT1 gene from the influence of the STE6 alpha2 operator in MATalpha cells. Interestingly, deletion of TRT2 results in an increase in CBT1 mRNA levels in MATa cells, indicating a potential tRNA position effect. The transcription of TRT2 itself is unaffected by the presence of the alpha2 operator, suggesting a hierarchy that favors assembly of the RNA polymerase III complex versus assembly of adjacent alpha2 operator-mediated repressed chromatin structures. This proposed hierarchy could explain how tRNA genes function as barriers to the propagation of repressive chromatin.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Simms TA,Miller EC,Buisson NP,Jambunathan N,Donze D

doi

10.1093/nar/gkh858

keywords:

subject

Has Abstract

pub_date

2004-09-30 00:00:00

pages

5206-13

issue

17

eissn

0305-1048

issn

1362-4962

pii

32/17/5206

journal_volume

32

pub_type

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