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Expressed Sequence Tags from Developing Castor Seeds

To expand the availability of genes encoding enzymes and structural proteins associated with storage lipid synthesis and deposition, partial nucleotide sequences, or expressed sequence tags (ESTs), were obtained for 743 cDNA clones derived from developing seeds of castor (Ricinus communis L.). Enrichment for seed-specific cDNA clones was obtained by selecting clones that did not detectably hybridize to first-strand cDNA from leaf mRNA. Similarly, clones that hybridized to storage proteins or other highly abundant mRNA species from developing seeds were selected against. To enrich for endomembrane-associated proteins, some clones were selected for sequencing by immunological screening with antibodies prepared against partially purified endoplasmic reticulum membranes. Comparison of the deduced amino acid sequences of the ESTs with the public data bases resulted in the assignment of putative identities of 49% of the clones selected by differential hybridization and 71% of the clones selected by immunological screening. Open reading frames in 100 of the ESTs exhibited higher homology to 78 different nonplant gene products than to any previously known plant gene product.