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Nucleic Acids Research, 1995, Vol. 23, No. 5 835-843
© 1995

RNA

Cabeza, a Drosophila gene encoding a novel RNA binding protein, shares homology with EWS and TLS, two genes involved in human sarcoma formation

David T. Stolow and Susan R. Haynes*

Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, National Institutes of Health Bethesda, MD 20892, USA

*To whom correspondence should be addressed

Received October 25, 1994. Revised January 10, 1995. Accepted January 10, 1995.

We have previously described a partial Drosophila cDNA, clone P19, which bears homology to members of the RNA recognition motif (RRM) family of proteins [Haynes et al. (1987) Proc. Natl. Acad. Sci. USA, 84, 1819–1823]. RNA binding as well as involvement in RNA processing has been demonstrated for some RRM proteins. We report here the further characterization of P19, which we renamed cabeza (caz). caz is located on the X chromosome at position 14B. Using Northern analysis, at least four transcripts from the cazgene were observed at varying levels during development. caz mRNA and protein are enriched in the brain and central nervous system during embryogenesis. In addition, the protein is enriched in the adult head. UV crosslinking was used to demonstrate in vitro RNA binding activity for full-length recombinant caz protein and for the caz RRM domain. Sequence analysis revealed caz is related to two human genes, EWS and TLS, which are involved in chromosomal translocations. The fusion of EWS and TLS to other cellular genes results in sarcoma formation. In addition to their overall structural organization and sequence similarity, these three genesshare an RRM which is divergent from typical RRMs. Therefore, it appears that these genes constitute a new sub-family of RNA binding proteins.


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