Nucleic Acids Research, 1994, Vol. 22, No. 7 1221-1225
© 1994
MOLECULAR BIOLOGY |
Extremely short 2033 nucleotide introns are the standard length in Paramecium tetraurelia
Basic Sciences Division, Fred Hutchinson Cancer Research Center 1124 Columbia St, Seattle, WA 98104, USA
* To whom correspondence should be addressed
Received December 20, 1993. Revised March 3, 1994. Accepted March 3, 1994.
Paramecium tetraurelia has the shortest known introns as its standard intron length. Sequenced introns vary between 20 and 33 nucleotides in length. The intron sequences were discovered in genomic sequences coding for a variety of different proteins, including phosphatases, kinases, and low-molecular weight GTP-blndlng proteins. All intron sequences begin with the conserved dlnucleotide GT and end with the conserved dinucleotide AG. The sequences are more AT rich than the Paramecium coding sequences. The identified sequences were confirmed as Introns by sequencing several cDNA fragments. We report here analysis of the characteristics of 50 separate introns, including size, base composition, and a consensus sequence.
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