Poly(pyrimidine) . poly(purine) synthetic DNAs containing 5-methylcytosine form stable triplexes at neutral pH.

Abstract:

:Poly(pyrimidine) . poly(purine) tracts have been discovered in the 5'-flanking regions of many eucaryotic genes. They may be involved in the regulation of expression since they can be mapped to the nuclease-sensitive sites of active chromatin. We have found that poly(pyrimidine) . poly(purine) DNAs which contain 5-methylcytosine (e.g. poly[d(Tm5C)] . poly[d(GA)]) will form a triplex at a pH below 8. In contrast, the unmethylated analogue, poly[d(TC)] . poly[d(GA)] only forms a triplex at pHs below 6. Synthetic DNAs containing repeating trinucleotides and poly[d(Um5C)] . poly[d(GA)] behave in a similar manner. Thus the stability of a triplex can be controlled by methylation of cytosine. This suggests a model for the regulation of expression based upon specific triplex formation on the 5'-side of eucaryotic genes.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Lee JS,Woodsworth ML,Latimer LJ,Morgan AR

doi

10.1093/nar/12.16.6603

subject

Has Abstract

pub_date

1984-08-24 00:00:00

pages

6603-14

issue

16

eissn

0305-1048

issn

1362-4962

journal_volume

12

pub_type

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