Worm Breeder's Gazette 13(5): 91 (February 1, 1995)

These abstracts should not be cited in bibliographies. Material contained herein should be treated as personal communication and should be cited as such only with the consent of the author.

The C. elegans cDNA Project: A Progress Report.

Yuji Kohara, Tomoko Motohashi, Akiko Sugimoto, Hisako Watanabe, Hiroaki Tabara

Gene Library Lab, National Institute of Genetics, Mishima 411, Japan e-mail: ykohara/*ddbj.nig.ac.jp

Tag sequencing is now on the third set of cDNA dones. After
analysis of the first set of cDNA clones (some 4,400 clones),
each 10,000 clones were picked up randomly from 3 different
cDNA libraries (an embryonic cDNA library and libraries
of >2kb cDNA and unfractionated cDNA made from mixed stage
population). The total 30,000 clones were gridded and
probed with the cDNA clones belonging to the species which
had been represented by more than 4 clones in the analysis
of the first set. A set of some 4,800 cDNA clones (the second
set) were selected out of the unhybridized clones (from
rare or not analyzed cDNA species) and has been subjected
to the tag sequencing. This analysis produced 3,667 clean
3'-tags which gave 1,532 more unique cDNA species (see
Fig.). As the next step, the grids were further screened
with the cDNA probes the groups containing more than 4 clones
at the point. A set of some 4,000 cDNA clones (the third set)
was selected out of the unhybridized clones and tag sequencing
has been continued on this set.
The current status of our progress is that we have identified
3,324 unique cDNA species out of 7,647 clones (clean 3'-tags).
The unique cDNA species were assigned serial numbers from
CELK00001 to CELK03324. These analyses have also detected
many pairs of clones which appeared to be generated by alternative
splicing. In some cases, two groups were turned out that
they were derived from the same gene but had different 3'-end
sequences due to alternative splicing or differential
poly-A addition. We are going to make a list of such differential
BLASTX search showed that 653 groups out of the 1,816 groups
identified through the analysis of the second and the third
sets gave significant similarities (blastx score > 100),
which are listed below. (Note; "-" in the column of "Frame"
means BLASTX search was made using only 3'-tag sequences
so far.)
Mapping and in situ analysis are in progress.