NDLI: Multiple introns in a conjugation-specific gene from Tetrahymena thermophila.

Content Provider	PubMed Central
Author	Martindale, D. W. Taylor, F. M.
Abstract	Multiple introns have been found in a gene from a ciliated protozoan. This Tetrahymena thermophila gene (cnjB) is large (7.5 kb mRNA) and active only during conjugation, the organism's sexual cycle. Six introns ranging in size from 62 bp to 676 bp were found when we sequenced a 3.1 kb segment of the cnjB gene together with its corresponding cDNA. We estimate, by extrapolation of our current data, a total of approximately 30 introns in this gene with a total gene size (introns plus exons) of 15 kb or more. The number of introns is surprising given the scarcity of introns in ciliate genes examined to date. Our findings constitute the first example of multiple introns in a ciliate gene. Having the sequence of several introns has allowed us to construct consensus sequences for T. thermophila mRNA introns. The 5' and 3' intron junctions resemble those of general nuclear mRNA (GT/AG rule is followed) but differences are seen. In particular, stretches of 10 or more adenines and thymines are found adjacent to the conserved GT and AGs at the junctions. Unusual aspects of the coding region of this gene are discussed.
Starting Page	2189
File Format	PDF
ISSN	13624962
e-ISSN	13624962
Journal	Nucleic Acids Research
Issue Number	5 Pt B
Volume Number	16
Language	English
Publisher Date	1988-03-25
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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Multiple introns in a conjugation-specific gene from Tetrahymena thermophila.