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Nucleic Acids Research, 1983, Vol. 11, No. 24 8761-8775
© 1983

MOLECULAR BIOLOGY

Structure and evolution of a mouse tRNA gene cluster encoding tRNAAsp, tRNAGly and tRNAGlu and an unlinked, solitary gene encoding tRNAAsp

James E. Looney* and John D. Harding+

Department of Biological Sciences, Columbia University 922 Fairchild Center, New York, NY 10027, USA

+ To whom to address correspondence

Received October 17, 1983. Revised November 14, 1983. Accepted November 14, 1983.

We have sequenced mouse tRNA genes from two recombinant {lambda} phage. An 1800 bp sequence from one phage contains 3 tRNA genes, potentially encoding tRNAAsp, tRNAGly, and tRNAGlu, separated by spacer sequences of 587 bp and 436 bp, respectively. The mouse tRNA gene cluster is homologous to a rat sequence (Sekiya et al., 1981, Nucleic Acids Res. 9, 2239–2250). The mouse and rat tRNAAsp and tRNAGly coding regions are identical. The tRNAGlu coding regions differ at two positions. The flanking sequences contain 3 non-homologous areas: a c. 100 bp insertion in the first mouse spacer, short tandemly repeated sequences in the second spacers and unrelated sequences at the 3' ends of the clusters. In contrast, most of the flanking regions are homologous, consisting of strings of consecutive, identical residues (5–17 bp) separated by single base differences and short insertions/deletions, The latter are often associated with short repeats. The homology of the flanking regions is c. 75%, similar to other murine genes.

The second {lambda} clone contains a solitary mouse tRNAAsp gene. The coding region is identical to that of the clustered tRNAsp gene. The 5' flanking regions of the two genes contain homologous areas (10–25 bp) separated by unrelated sequences. Overall, the flanking regions of the two mouse tRNAAsp genes are less homologous than those of the mouse and rat clusters.

* Current address: Department of Biochemistry, University of Virginia School of Medicine, Charlottesville, VA, 22908.


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