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Science 20 January 1989:
Vol. 243. no. 4889, pp. 385 - 388
DOI: 10.1126/science.2563175

Articles

Science, Vol 243, Issue 4889, 385-388
Copyright © 1989 by American Association for the Advancement of Science


articles

Molecular cloning of genes under control of the circadian clock in Neurospora

JJ Loros, SA Denome, and JC Dunlap

Department of Biochemistry, Dartmouth Medical School, Hanover, NH 03756.

To investigate the regulation of messenger RNA abundance by circadian clocks, genomic and complementary DNA libraries were screened with complementary DNA probes enriched, by means of sequential rounds of subtractive hybridization, for sequences complementary to transcripts specific to either early morning or early evening cultures of Neurospora. Only two morning-specific genes were identified through this protocol. RNA blot analysis verified that the abundance of the transcripts arising from these genes oscillates with a period of 21.5 hours in a clock wild-type strain and 29 hours in the long-period clock mutant strain frq7. Genetic mapping through the use of restriction fragment length polymorphisms shows the two genes, ccg-1 and ccg-2, to be unlinked. These data provide a view of the extent of clock control of gene expression.


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