C-myc deregulation during transformation induction: involvement of 7SK RNA.

Abstract:

:The process of oncogenic transformation has been widely studied but is still poorly understood. We have focused on the mechanism of deregulation of the c-myc gene during transformation of a temperature-sensitive SV40-transformed mouse cell line. Run-on transcription assays showed that the two c-myc minor promoters, P1 and P3, are transiently activated following induction of transformation and that peak activation of both promoters is preceded by a large increase in transcription of a small RNA (7SK). To test the possibility that this RNA might participate in promoter activation, we transfected cells with sense and antisense oligodeoxynucleotides corresponding to different regions of the 7SK RNA predicted to be accessible within the RNP particle. Out of 14 oligos tested, inhibition of activation of P1 and/or P3 was observed with four antisense oligonucleotides corresponding to looped regions in the putative 7SK secondary structure. To identify c-myc promoter sequences which might serve as targets for 7SK activity, we carried out mobility-shift assays with either whole or 7SK-depleted cell extracts. The CT element of the c-myc promoter formed a 7SK-dependent complex which could be competed only with the same antisense 7SK oligo that suppressed P1 and P3 activation in vivo. Taken together these results suggest that 7SK RNP participates in transformation-dependent c-myc deregulation.

journal_name

J Cell Biochem

authors

Luo Y,Kurz J,MacAfee N,Krause MO

doi

10.1002/(sici)1097-4644(199702)64:2<313::aid-jcb13

subject

Has Abstract

pub_date

1997-02-01 00:00:00

pages

313-27

issue

2

eissn

0730-2312

issn

1097-4644

pii

10.1002/(SICI)1097-4644(199702)64:2<313::AID-JCB13

journal_volume

64

pub_type

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