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 Physioljournal_title
Journal of cellular physiologyauthors
Hepfer CE,Little WA,Hengst JA,Freed JJdoi
10.1002/jcp.1041390124subject
Has Abstractpub_date
1989-04-01 00:00:00pages
175-80issue
1eissn
0021-9541issn
1097-4652journal_volume
139pub_type
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