Introduction of an initiator element in the mouse thymidylate synthase promoter alters S phase regulation but has no effect on promoter bidirectionality.

Abstract:

:The promoter of the mouse thymidylate synthase (TS) gene lacks a TATAA box and an initiator element, is bidirectional and initiates transcription at multiple start sites across broad initiation windows upstream and downstream of the 30 nt essential promoter region. The TS promoter also plays an essential role in the post-transcription regulation of TS gene expression during the G(1)-S phase transition. The goal of this study was to determine if the addition of a TATAA box or an initiator element would have a significant effect on start-site pattern, promoter bidirectionality and S phase regulation of the TS gene. A TATAA box and/or an initiator element were inserted downstream of the TS essential promoter region, and the modified promoters were used to drive expression of indicator genes. The engineered genes were transfected into cultured mammalian cells, and the effects of the mutations were determined. Addition of the TATAA box and especially the initiator element had a significant effect on the transcription start site pattern, indicating that the elements were functional. Unexpectedly, addition of one or both of these elements had no effect on promoter bidirectionality. However, inclusion of the initiator element led to a significant reduction in S phase regulation of TS mRNA levels, indicating that changes in promoter architecture can perturb normal S phase regulation of TS gene expression.

journal_name

J Cell Biochem

authors

Kapadia F,Johnson LF

doi

10.1002/jcb.20666

subject

Has Abstract

pub_date

2006-02-15 00:00:00

pages

599-608

issue

3

eissn

0730-2312

issn

1097-4644

journal_volume

97

pub_type

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