Expression of asparagine independence in variants of ICR 2A haploid frog cells.

Abstract:

:Properties of the change from asparagine dependence (asn-) to independence (asn+) were investigated in the androgenetic haploid frog cell line ICR 2A. Two types of asn+ variants arose spontaneously during culture. Glutamine-dependent asparagine synthetase (AS) activity, found to be deficient in asn- cells, was repressed by asparagine in one type of variant and expressed constitutively in the other. No quantitative differences in AS-specific DNA sequences or changes in ploidy were evident between asn+ and asn- cells. The asn+ frequency in ICR 2A populations, not dramatically influenced by chemical mutagens, was increased 130-fold by exposure to 5-azacytidine. The methylation of CCGG sequences at the 5' end of the AS structural gene was found to be reduced equally in both types of asn+ variant. These results indicate that decreased DNA methylation is essential but not necessarily sufficient for the expression of AS activity in this frog cell system.

journal_name

J Cell Physiol

authors

Hepfer CE,Little WA,Hengst JA,Freed JJ

doi

10.1002/jcp.1041390124

subject

Has Abstract

pub_date

1989-04-01 00:00:00

pages

175-80

issue

1

eissn

0021-9541

issn

1097-4652

journal_volume

139

pub_type

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