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Genetics, Vol. 157, 1057-1065, March 2001, Copyright © 2001

Analysis of Expressed Sequence Tags From Two Starvation, Time-of-Day-Specific Libraries of Neurospora crassa Reveals Novel Clock-Controlled Genes

Hua Zhua, Minou Nowrousianb, Doris Kupfera, Hildur V. Colotb, Gloria Berrocal-Titob, Hongshing Laia, Deborah Bell-Pedersenc, Bruce A. Roea, Jennifer J. Lorosb, and Jay C. Dunlapb
a Department of Chemistry and Biochemistry, Advanced Center for Genome Technology, University of Oklahoma, Norman, Oklahoma 73019,
b Departments of Genetics and Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755
c Department of Biology, Biological Sciences, Texas A&M University, College Station, Texas 77843

Corresponding author: Jay C. Dunlap, Department of Genetics, Dartmouth Medical School, Hanover, NH 03755., jay.c.dunlap{at}dartmouth.edu (E-mail)

Communicating editor: J. ARNOLD

In an effort to determine genes that are expressed in mycelial cultures of Neurospora crassa over the course of the circadian day, we have sequenced 13,000 cDNA clones from two time-of-day-specific libraries (morning and evening library) generating ~20,000 sequences. Contig analysis allowed the identification of 445 unique expressed sequence tags (ESTs) and 986 ESTs present in multiple cDNA clones. For ~50% of the sequences (710 of 1431), significant matches to sequences in the National Center for Biotechnology Information database (of known or unknown function) were detected. About 50% of the ESTs (721 of 1431) showed no similarity to previously identified genes. We hybridized Northern blots with probes derived from 26 clones chosen from contigs identified by multiple cDNA clones and EST sequences. Using these sequences, the representation of genes among the morning and evening sequences, respectively, in most cases does not reflect their expression patterns over the course of the day. Nevertheless, we were able to identify four new clock-controlled genes. On the basis of these data we predict that a significant proportion of the expressed Neurospora genes may be regulated by the circadian clock. The mRNA levels of all four genes peak in the subjective morning as is the case with previously identified ccgs.




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